Which airlines fly to Denver?

Frontier, Alaska Airlines and Delta are the top three most popular airlines that fly to Denver from Seattle according to our data. Frontier is the first choice among our users, with 59% of people opting to fly with this airline when travelling to Denver. Keep in mind that there are 5 different airlines that fly to Denver on a routine basis, so you have a few additional options to choose from.

Which airline has the best punctuality record on Seattle to Denver flights?

According to our data, Atlas Air has had the lowest number of delays on this route over the last 12 months, with no flights being classified as delayed.

What is the cheapest airline that flies from Seattle/Tacoma Intl to Denver Intl?

Delta, Frontier, and Southwest are the most popular carriers operating from Seattle/Tacoma Intl to Denver Intl

How many flights depart from Seattle to Denver on average per day?

As of November 2025, 26 flights take off from Seattle and land in Denver each day. The most common flight departure time for this route is 3:00p.m., with 40% of daily flights taking off in the afternoon.

What is the most punctual flight time for Seattle to Denver flights?

Generally, flights departing at night tend to experience fewer delays. Flights departing in the early afternoon have, in the past, seen delays more frequently in comparison.

What day of the week experiences the fewest flight delays on this route?

Saturday is statistically the day of the week that experiences the fewest delays on this flight route. Sunday has historically seen more delays on average compared to the rest of the week.

How many flights depart from Seattle to Denver on average per week?

The number of flights available between Seattle and Denver is 185 per week as of November 2025. The most frequent departure day is Mon, with 22% of weekly flights leaving on this day.

How often are flights from Seattle to Denver delayed?

Historically, on average around 19% of flights between Seattle and Denver have experienced a delay on any given week. The average delay length over the past 12 months has been 133 minutes.

When did momondo last update prices for flights from Seattle/Tacoma Intl Airport to Denver Intl Airport?

Prices for flights from Seattle/Tacoma Intl Airport to Denver Intl Airport are updated daily.

How many operators does momondo search for flights from Seattle/Tacoma Intl Airport to Denver Intl Airport?

The number of operators available for flights from Seattle/Tacoma Intl Airport to Denver Intl Airport is 5 as of November 2025.

How old do you have to be to fly from Seattle/Tacoma Intl Airport to Denver Intl Airport?

The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Seattle/Tacoma Intl Airport to Denver Intl Airport.

What documentation or ID do you need to fly to Denver Intl Airport?

The travel and health documents required for your trip to Denver Intl Airport can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Denver Intl Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

C$ 60 Cheap Flights from Seattle to Denver in 2025/26

1 adult

Discover deals from 900+ travel sites with momondo.

Save money when you book flights with momondo

Big names, great deals

Search 100s of travel sites to compare prices.

Filter for what you want

Free Wi-Fi? Early arrival? Instantly customize your results

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Not ready to book? to track prices.

Search flight deals

Find the cheapest flights from Seattle to Denver

Round-trip

One-way

Last minute

Direct

Cheap round-trip flights

Enter your travel dates to find the best prices.

7:35 p.m. - 11:21 p.m.SEA-DEN

2h 46mdirect

12:25 p.m. - 2:33 p.m.DEN-SEA

3h 08mdirect

C$ 136Delta

Find Deal

Wed, 3 Dec - Wed, 10 Dec

7:35 p.m. - 11:21 p.m.SEA-DEN

2h 46mdirect

6:05 a.m. - 8:15 a.m.DEN-SEA

3h 10mdirect

C$ 138Delta

Find Deal

Thu, 4 Dec - Sun, 7 Dec

12:58 p.m. - 9:49 p.m.SEA-DEN

7h 51m1 stop

9:58 a.m. - 12:07 p.m.DEN-SEA

3h 09mdirect

C$ 139Frontier

Find Deal

Mon, 17 Nov - Tue, 18 Nov

2:54 p.m. - 6:43 p.m.SEA-DEN

2h 49mdirect

6:00 a.m. - 4:36 p.m.DEN-SEA

11h 36m1 stop

C$ 143Frontier

Find Deal

Sun, 4 Jan - Fri, 9 Jan

8:35 p.m. - 12:05 a.m.SEA-DEN

2h 30mdirect

10:35 p.m. - 12:35 a.m.DEN-SEA

3h 00mdirect

C$ 145Southwest

Find Deal

Mon, 1 Dec - Sun, 7 Dec

11:20 p.m. - 10:45 a.m.SEA-DEN

10h 25m1 stop

12:40 p.m. - 2:46 p.m.DEN-SEA

3h 06mdirect

C$ 159Alaska Airlines

Find Deal

Tue, 2 Dec - Tue, 9 Dec

6:15 a.m. - 2:10 p.m.SEA-DEN

6h 55m2 stops

10:35 p.m. - 12:35 a.m.DEN-SEA

3h 00mdirect

C$ 166Southwest

Find Deal

Thu, 4 Dec - Sun, 7 Dec

11:20 p.m. - 10:45 a.m.SEA-DEN

10h 25m1 stop

11:41 a.m. - 5:35 p.m.DEN-SEA

6h 54m1 stop

C$ 171Alaska Airlines

Find Deal

Tue, 2 Dec - Tue, 9 Dec

7:54 p.m. - 11:35 p.m.SEA-DEN

2h 41mdirect

10:30 a.m. - 12:44 p.m.DEN-SEA

3h 14mdirect

C$ 173Multiple Airlines

Find Deal

Thu, 5 Feb - Mon, 9 Feb

1:37 p.m. - 5:30 p.m.SEA-DEN

2h 53mdirect

6:14 a.m. - 8:26 a.m.DEN-SEA

3h 12mdirect

C$ 185Multiple Airlines

Find Deal

Wed, 19 Nov - Mon, 24 Nov

Frontier flights from Seattle to Denver

Our best Frontier deals on Seattle to Denver flight tickets

Frontier

17 Nov

SEA12:58 p.m.Seattle/Tacoma Intl

7h 51m

1 stop

DEN9:49 p.m.Denver Intl

18 Nov

DEN9:58 a.m.Denver Intl

3h 09m

SEA12:07 p.m.Seattle/Tacoma Intl

C$ 139

Find similar

Frontier

4 Jan

SEA2:54 p.m.Seattle/Tacoma Intl

2h 49m

DEN6:43 p.m.Denver Intl

9 Jan

DEN6:00 a.m.Denver Intl

11h 36m

1 stop

SEA4:36 p.m.Seattle/Tacoma Intl

C$ 143

Find similar

Frontier

10 Nov

SEA12:58 p.m.Seattle/Tacoma Intl

7h 51m

1 stop

DEN9:49 p.m.Denver Intl

18 Nov

DEN9:58 a.m.Denver Intl

3h 09m

SEA12:07 p.m.Seattle/Tacoma Intl

C$ 209

Find similar

Southwest flights from Seattle to Denver

Our best Southwest deals on Seattle to Denver flight tickets

Southwest

1 Dec

SEA8:35 p.m.Seattle/Tacoma Intl

2h 30m

DEN12:05 a.m.Denver Intl

7 Dec

DEN10:35 p.m.Denver Intl

3h 00m

SEA12:35 a.m.Seattle/Tacoma Intl

C$ 145

Find similar

Southwest

4 Dec

SEA6:15 a.m.Seattle/Tacoma Intl

6h 55m

2 stops

DEN2:10 p.m.Denver Intl

7 Dec

DEN10:35 p.m.Denver Intl

3h 00m

SEA12:35 a.m.Seattle/Tacoma Intl

C$ 166

Find similar

Southwest

13 Dec

SEA5:45 a.m.Seattle/Tacoma Intl

9h 40m

1 stop

DEN4:25 p.m.Denver Intl

14 Dec

DEN7:10 p.m.Denver Intl

5h 55m

1 stop

SEA12:05 a.m.Seattle/Tacoma Intl

C$ 191

Find similar

Fly from

Fly to

Route

Depart

Return

Price

SeattleDenver

SEA - DEN

SEADEN

Seattle/Tacoma Intl

Wed 3/12

7:35 p.m.-11:21 p.m.

Nonstop2h 46m

Denver Intl

Wed 10/12

12:25 p.m.-2:33 p.m.

Nonstop3h 08m

C$ 136

SeattleDenver

SEA - DEN

SEADEN

Seattle/Tacoma Intl

Thu 4/12

7:35 p.m.-11:21 p.m.

Nonstop2h 46m

Denver Intl

Sun 7/12

6:05 a.m.-8:15 a.m.

Nonstop3h 10m

C$ 138

SeattleDenver

SEA - DEN

SEADEN

Seattle/Tacoma Intl

Mon 17/11

12:58 p.m.-9:49 p.m.

1 stop7h 51m

Denver Intl

Tue 18/11

9:58 a.m.-12:07 p.m.

Nonstop3h 09m

C$ 139

SeattleDenver

SEA - DEN

SEADEN

Seattle/Tacoma Intl

Sun 4/1

2:54 p.m.-6:43 p.m.

Nonstop2h 49m

Denver Intl

Fri 9/1

6:00 a.m.-4:36 p.m.

1 stop11h 36m

C$ 143

SeattleDenver

SEA - DEN

SEADEN

Seattle/Tacoma Intl

Mon 1/12

8:35 p.m.-12:05 a.m.

Nonstop2h 30m

Denver Intl

Sun 7/12

10:35 p.m.-12:35 a.m.

Nonstop3h 00m

C$ 145

SeattleDenver

SEA - DEN

SEADEN

Seattle/Tacoma Intl

Tue 2/12

11:20 p.m.-10:45 a.m.

1 stop10h 25m

Denver Intl

Tue 9/12

12:40 p.m.-2:46 p.m.

Nonstop3h 06m

C$ 159

SeattleDenver

SEA - DEN

SEADEN

Seattle/Tacoma Intl

Thu 4/12

6:15 a.m.-2:10 p.m.

2 stops6h 55m

Denver Intl

Sun 7/12

10:35 p.m.-12:35 a.m.

Nonstop3h 00m

C$ 166

SeattleDenver

SEA - DEN

SEADEN

Seattle/Tacoma Intl

Tue 2/12

11:20 p.m.-10:45 a.m.

1 stop10h 25m

Denver Intl

Tue 9/12

11:41 a.m.-5:35 p.m.

1 stop6h 54m

C$ 171

SeattleDenver

SEA - DEN

SEADEN

Seattle/Tacoma Intl

Thu 5/2

7:54 p.m.-11:35 p.m.

Nonstop2h 41m

Denver Intl

Mon 9/2

10:30 a.m.-12:44 p.m.

Nonstop3h 14m

C$ 173

SeattleDenver

SEA - DEN

SEADEN

Seattle/Tacoma Intl

Wed 19/11

1:37 p.m.-5:30 p.m.

Nonstop2h 53m

Denver Intl

Mon 24/11

6:14 a.m.-8:26 a.m.

Nonstop3h 12m

C$ 185

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first

How to get the cheapest flight ticket from Seattle to Denver

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

Prices

Airlines

Delays

Other information

What is the cheapest month to fly to Denver?

In general, January is the cheapest month to fly from Seattle to Denver. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around C$ 264. If you aren’t able to travel during the month of January, then book flights to Denver from Seattle during October instead. Flights to Denver in October, while not as cheap as those in January, still average around C$ 265.

What is the cheapest day to depart on your flight to Denver?

The cheapest day to depart from Seattle to Denver is on a Sunday. Travellers who choose to depart for Denver on a Sunday will often find tickets for as low as C$ 325. On the other hand, Monday is the most expensive day to depart from Seattle because it is more convenient for both business and leisure travellers. As a result, prices tend to be around C$ 560.

What is the cheapest time of day to depart on your flight to Denver?

Our most recent data shows that the best time of day to fly to Denver is at noon. Flights from Seattle to Denver during this time can be as low as C$ 264. Try not to purchase tickets in the morning because they tend to be around C$ 461. Of course, these prices can vary depending on the time of year and what airport you fly to.

What is the cheapest Seattle/Tacoma Intl to Denver Intl flight route?

Fly from Seattle/Tacoma Intl to Denver Intl for the best Seattle/Tacoma Intl - Denver Intl flight prices

How far in advance should I book a flight to Denver?

You are more likely to see cheaper flights to Denver from Seattle when booking weeks ahead of your departure date. In general, you can expect to find flights to Denver for around C$ 301 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Denver from Seattle for as low as C$ 264 on momondo.

What cabin class options are available on Seattle/Tacoma Intl to Denver Intl flights?

There are 3 cabin classes available to choose from on Seattle/Tacoma Intl to Denver Intl flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

How have Seattle to Denver flight prices changed over time?

As of November 2025, prices for Seattle to Denver flights are approximately 28% more expensive when compared to flights at the same time last year.

When to book flights from Seattle to Denver

Are you open to changing your travel dates? Check out the ideal times to fly from Seattle to Denver according to our flight data. Find out which month and days have the cheapest flights.

Estimated round-trip price

Cheap Seattle to Denver (SEA to DEN) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Seattle to Denver

Best price found	C$ 183
Fastest flight time	2h 30m
Direct flights	Every day
Airports in Denver	1 airport

The best one-way flight to Denver from Seattle in the past 72 hours is C$ 183. The best round-trip flight deal from Seattle to Denver found on momondo in the last 72 hours is C$ 215.

The fastest flight from Seattle to Denver takes 2h 30m

Direct flights go from Seattle to Denver every day.

There is 1 airport near Denver: Denver Intl (DEN)

Search flight deals

How far is Seattle/Tacoma Intl to Denver Intl by plane?
A flight from Seattle/Tacoma Intl to Denver Intl will travel around 1640.8 km. By plane, this route typically takes 2h 30m.
When did momondo last update prices for flights from Seattle/Tacoma Intl Airport to Denver Intl Airport?
Prices for flights from Seattle/Tacoma Intl Airport to Denver Intl Airport are updated daily.
How many operators does momondo search for flights from Seattle/Tacoma Intl Airport to Denver Intl Airport?
The number of operators available for flights from Seattle/Tacoma Intl Airport to Denver Intl Airport is 5 as of November 2025.
How old do you have to be to fly from Seattle/Tacoma Intl Airport to Denver Intl Airport?
The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Seattle/Tacoma Intl Airport to Denver Intl Airport.
What documentation or ID do you need to fly to Denver Intl Airport?
The travel and health documents required for your trip to Denver Intl Airport can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Denver Intl Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.
What is the most popular plane model from Seattle to Denver?
Based on momondo bookings for this flight route, the most popular plane model on flight routes from Seattle to Denver is Boeing 737 MAX 9 (13.79% of total bookings). The next most popular plane models are Boeing 737-800 Passenger/BBJ2 (winglets) (12.75%), Airbus A321neo (11.40%), and Boeing 737-900 Passenger/BBJ3 (winglets) (11.12%).
What is the most popular airline from Seattle to Denver?
momondo data reveals that the most frequently booked airline on the route from Seattle to Denver is Frontier, representing 51% of all bookings. The subsequent popular airlines are Alaska Airlines at 19%, Delta at 11%, and Southwest at 10%.

Best airlines flying from Seattle to Denver

Compare and see reviews for airlines that fly from Seattle to Denver with momondo

Airline	Rating	Free Cancellation	Price
Frontier	PriceFrom C$ 61	Free Cancellation	Rating 5.8 3,116 reviews	Search Frontier flights
Delta	PriceFrom C$ 110	Free Cancellation	Rating 7.9 8,002 reviews	Search Delta flights
Southwest	PriceFrom C$ 117	Free Cancellation	Rating 8.0 4,237 reviews	Search Southwest flights
Hawaiian Airlines	PriceFrom C$ 182	Free Cancellation	Rating 7.8 2,799 reviews	Search Hawaiian Airlines flights
Alaska Airlines	PriceFrom C$ 220	Free Cancellation	Rating 8.0 11,240 reviews	Search Alaska Airlines flights

Southwest Flights From Seattle to Denver
Southwest flies from Seattle to Denver around 16 times per week, with 4,238 momondo users rating the airline 8.0/10. The cheapest Southwest deal from Seattle to Denver in the last 72 hours was C$ 117 (round-trip), much lower than the average airfare cost of C$ 222 for Southwest flights on this route.
Alaska Airlines Flights From Seattle to Denver
Alaska Airlines (8.0/10 from 11,236 reviews) operates around 11 flights from Seattle to Denver in any given week. The average Alaska Airlines airfare for this route is around C$ 332, with deals from around C$ 220 rare but found on momondo. Referenced prices are for round-trip Seattle to Denver flight searches in the last 72 hours.

Silverthorne

Wheat Ridge

Winter Park

Lakewood

Longmont

Boulder

Fort Collins

Littleton

Englewood

Why use momondo?

Why should I use momondo to find a flight deal from Seattle to Denver?

We help find the flight that best suits your needs, momondo compares prices from hundreds of airlines and travel agents and helps you filter them to find the best flight from Seattle to Denver for you.

Can I find flights from Seattle to Denver with flexible booking policies on momondo?

All flight searches from Seattle to Denver on momondo can be filtered to show those which offer flexible booking policies.

How can momondo help me find flights from Seattle to Denver?

Once you have performed a search for Seattle to Denver flights, momondo helps you find the right one by offering useful filters to narrow down your flight selection. Flights can be filtered by multiple factors such as airline, airport and price; but also by other criteria like aircraft type and payment method.

I’m not ready to book a flight from Seattle to Denver right now. Can momondo alert me if prices change?

If you are not ready to book a flight from Seattle to Denver now, use our insights above to find helpful tips or alternatively set up a price alert, where momondo will track prices on flights to Denver and let you know when they change.

An easier way to manage your Denver trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.

Start using Trips

Find my bookings

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.

1 adult

Thu 4/12

Thu 11/12

Email me momondo's favourite deals

By creating a price alert you accept our terms of use and privacy policy.

Find better results for your trip to the United States

Airports servicing Colorado

Aspen Pitkin County Airport

Colorado Springs Airport

Durango La Plata County Airport

Vail Eagle County Airport

Grand Junction Regnl Airport

Gunnison Airport

Hayden Yampa Valley Airport

Montrose County Airport

Popular Cities in the United States

Flights to Fort Lauderdalefrom C$ 163

Flights to Orlandofrom C$ 182

Flights to New Yorkfrom C$ 268

Flights to Las Vegasfrom C$ 152

Flights to Los Angelesfrom C$ 160

Flights to Miamifrom C$ 285

Flights to San Franciscofrom C$ 146

Flights to Honolulufrom C$ 319

Flights to Phoenixfrom C$ 164

Flights to Tampafrom C$ 226

Flights to Chicagofrom C$ 181

Flights to Houstonfrom C$ 243

Cheap flights from Seattle to Denver from C$ 83

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Seattle to Denver departing on 30/12. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.

Big names, great deals

Big names, great deals

Filter for what you want

Filter for what you want

Trusted and free

Trusted and free

Price Alerts

Price Alerts

Find the cheapest flights from Seattle to Denver

Cheap round-trip flights

Cheap one-way flights

Cheap last-minute flights

Cheap direct flights

Frontier flights from Seattle to Denver

Our best Frontier deals on Seattle to Denver flight tickets

Southwest flights from Seattle to Denver

Our best Southwest deals on Seattle to Denver flight tickets

momondo Fare Finder

Use the filters below to find and compare flights from Seattle to Denver that are best for you.

See travel insights to Denver from

How to get the cheapest flight ticket from Seattle to Denver

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest month to fly to Denver?

What is the cheapest day to depart on your flight to Denver?

What is the cheapest time of day to depart on your flight to Denver?

What is the cheapest Seattle/Tacoma Intl to Denver Intl flight route?

Fly from Seattle/Tacoma Intl to Denver Intl for the best Seattle/Tacoma Intl - Denver Intl flight prices

How far in advance should I book a flight to Denver?

What cabin class options are available on Seattle/Tacoma Intl to Denver Intl flights?

There are 3 cabin classes available to choose from on Seattle/Tacoma Intl to Denver Intl flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

How have Seattle to Denver flight prices changed over time?

As of November 2025, prices for Seattle to Denver flights are approximately 28% more expensive when compared to flights at the same time last year.

What is the cheapest airline that flies from Seattle/Tacoma Intl to Denver Intl?

Delta, Frontier, and Southwest are the most popular carriers operating from Seattle/Tacoma Intl to Denver Intl

Which airlines fly to Denver?

How often are flights from Seattle to Denver delayed?

Historically, on average around 19% of flights between Seattle and Denver have experienced a delay on any given week. The average delay length over the past 12 months has been 133 minutes.

What is the most punctual flight time for Seattle to Denver flights?

Generally, flights departing at night tend to experience fewer delays. Flights departing in the early afternoon have, in the past, seen delays more frequently in comparison.

What day of the week experiences the fewest flight delays on this route?

Saturday is statistically the day of the week that experiences the fewest delays on this flight route. Sunday has historically seen more delays on average compared to the rest of the week.

Which airline has the best punctuality record on Seattle to Denver flights?

According to our data, Atlas Air has had the lowest number of delays on this route over the last 12 months, with no flights being classified as delayed.

How many flights depart from Seattle to Denver on average per day?

As of November 2025, 26 flights take off from Seattle and land in Denver each day. The most common flight departure time for this route is 3:00p.m., with 40% of daily flights taking off in the afternoon.

How many flights depart from Seattle to Denver on average per week?

The number of flights available between Seattle and Denver is 185 per week as of November 2025. The most frequent departure day is Mon, with 22% of weekly flights leaving on this day.

When to book flights from Seattle to Denver

Cheap Seattle to Denver (SEA to DEN) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Seattle to Denver

Best price found

Fastest flight time

Direct flights

Airports in Denver

How far is Seattle/Tacoma Intl to Denver Intl by plane?

When did momondo last update prices for flights from Seattle/Tacoma Intl Airport to Denver Intl Airport?

How many operators does momondo search for flights from Seattle/Tacoma Intl Airport to Denver Intl Airport?

How old do you have to be to fly from Seattle/Tacoma Intl Airport to Denver Intl Airport?

What documentation or ID do you need to fly to Denver Intl Airport?

What is the most popular plane model from Seattle to Denver?

What is the most popular airline from Seattle to Denver?

Best airlines flying from Seattle to Denver

Compare and see reviews for airlines that fly from Seattle to Denver with momondo

Southwest Flights From Seattle to Denver

Alaska Airlines Flights From Seattle to Denver

Travelling to a place near Denver?

Why use momondo?

Why should I use momondo to find a flight deal from Seattle to Denver?

Can I find flights from Seattle to Denver with flexible booking policies on momondo?

How can momondo help me find flights from Seattle to Denver?

I’m not ready to book a flight from Seattle to Denver right now. Can momondo alert me if prices change?

An easier way to manage your Denver trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.

Find better results for your trip to the United States

Airports servicing Colorado