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

The number of flights available between Seattle and Denver is 230 per week as of December 2025. The most frequent departure day is Fri, with 18% of weekly flights leaving on this day.

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 66% 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, United Airlines has had the least delays on this route over the last 12 months, with about 10% of their flights experiencing any sort of delay.

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 day?

As of December 2025, 32 flights take off from Seattle and land in Denver each day. The most common flight departure time for this route is 2:00p.m., with 45% of daily flights taking off in the afternoon.

How often are flights from Seattle to Denver delayed?

Historically, on average around 18% 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 134 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 is the cheapest airline that flies from Seattle/Tacoma Intl to Denver Intl?

United Airlines and Delta are the most popular carriers operating from Seattle/Tacoma Intl to Denver Intl

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 December 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$ 59 Cheap Flights from Seattle to Denver in 2025/26

1 adult

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Round-trip

One-way

Last minute

Direct

Cheap round-trip flights

Enter your travel dates to find the best prices.

1:16 p.m. - 5:07 p.m.

SEA

DEN

2h 51mdirect

9:50 p.m. - 8:13 a.m.

DEN

SEA

11h 23m1 stop

C$ 115Frontier

Thu, 19 Feb - Wed, 25 Feb

7:40 p.m. - 11:25 p.m.

SEA

DEN

2h 45mdirect

12:30 p.m. - 2:41 p.m.

DEN

SEA

3h 11mdirect

C$ 134Delta

Mon, 23 Feb - Wed, 25 Feb

1:38 p.m. - 9:06 p.m.

SEA

DEN

6h 28m1 stop

12:30 p.m. - 2:41 p.m.

DEN

SEA

3h 11mdirect

C$ 148Delta

Tue, 24 Feb - Wed, 4 Mar

5:25 a.m. - 11:54 a.m.

SEA

DEN

5h 29m1 stop

6:29 a.m. - 8:40 a.m.

DEN

SEA

3h 11mdirect

C$ 161Delta

Sun, 11 Jan - Thu, 15 Jan

12:00 p.m. - 3:50 p.m.

SEA

DEN

2h 50mdirect

9:10 a.m. - 11:19 a.m.

DEN

SEA

3h 09mdirect

C$ 163Frontier

Fri, 13 Feb - Mon, 16 Feb

5:00 a.m. - 8:48 a.m.

SEA

DEN

2h 48mdirect

4:20 p.m. - 6:26 p.m.

DEN

SEA

3h 06mdirect

C$ 166United Airlines

Fri, 6 Feb - Fri, 6 Feb

5:00 a.m. - 8:48 a.m.

SEA

DEN

2h 48mdirect

11:50 a.m. - 1:58 p.m.

DEN

SEA

3h 08mdirect

C$ 171United Airlines

Fri, 16 Jan - Sat, 24 Jan

5:25 a.m. - 11:54 a.m.

SEA

DEN

5h 29m1 stop

12:49 p.m. - 6:29 p.m.

DEN

SEA

6h 40m1 stop

C$ 175Delta

Sun, 11 Jan - Mon, 12 Jan

11:30 a.m. - 10:50 p.m.

SEA

DEN

10h 20m1 stop

7:00 p.m. - 9:05 p.m.

DEN

SEA

3h 05mdirect

C$ 182Southwest

Fri, 16 Jan - Sat, 24 Jan

12:19 p.m. - 4:10 p.m.

SEA

DEN

2h 51mdirect

9:00 a.m. - 11:09 a.m.

DEN

SEA

3h 09mdirect

C$ 185Frontier

Thu, 15 Jan - Sun, 18 Jan

Frontier flights from Seattle to Denver

Our best Frontier deals on Seattle to Denver flight tickets

Frontier

19 Feb

SEA1:16 p.m.Seattle/Tacoma Intl

2h 51m

DEN5:07 p.m.Denver Intl

25 Feb

DEN9:50 p.m.Denver Intl

11h 23m

1 stop

SEA8:13 a.m.Seattle/Tacoma Intl

C$ 115

Find similar

Frontier

13 Feb

SEA12:00 p.m.Seattle/Tacoma Intl

2h 50m

DEN3:50 p.m.Denver Intl

16 Feb

DEN9:10 a.m.Denver Intl

3h 09m

SEA11:19 a.m.Seattle/Tacoma Intl

C$ 163

Find similar

Frontier

15 Jan

SEA12:19 p.m.Seattle/Tacoma Intl

2h 51m

DEN4:10 p.m.Denver Intl

18 Jan

DEN9:00 a.m.Denver Intl

3h 09m

SEA11:09 a.m.Seattle/Tacoma Intl

C$ 185

Find similar

Delta flights from Seattle to Denver

Our best Delta deals on Seattle to Denver flight tickets

Delta

23 Feb

SEA7:40 p.m.Seattle/Tacoma Intl

2h 45m

DEN11:25 p.m.Denver Intl

25 Feb

DEN6:40 a.m.Denver Intl

3h 11m

SEA8:51 a.m.Seattle/Tacoma Intl

C$ 134

Find similar

Delta

24 Feb

SEA7:40 p.m.Seattle/Tacoma Intl

2h 45m

DEN11:25 p.m.Denver Intl

25 Feb

DEN6:20 p.m.Denver Intl

6h 49m

1 stop

SEA12:09 a.m.Seattle/Tacoma Intl

C$ 148

Find similar

Delta

11 Jan

SEA5:25 a.m.Seattle/Tacoma Intl

5h 29m

1 stop

DEN11:54 a.m.Denver Intl

12 Jan

DEN6:29 a.m.Denver Intl

3h 11m

SEA8:40 a.m.Seattle/Tacoma Intl

C$ 161

Find similar

Fly from

Fly to

Route

Depart

Return

Price

SeattleDenver

SEA - DEN

SEADEN

Seattle/Tacoma Intl

Thu 19/2

1:16 p.m.-5:07 p.m.

Nonstop2h 51m

Denver Intl

Wed 25/2

9:50 p.m.-8:13 a.m.

1 stop11h 23m

C$ 115

SeattleDenver

SEA - DEN

SEADEN

Seattle/Tacoma Intl

Mon 23/2

7:40 p.m.-11:25 p.m.

Nonstop2h 45m

Denver Intl

Wed 25/2

12:30 p.m.-2:41 p.m.

Nonstop3h 11m

C$ 134

SeattleDenver

SEA - DEN

SEADEN

Seattle/Tacoma Intl

Tue 24/2

1:38 p.m.-9:06 p.m.

1 stop6h 28m

Denver Intl

Wed 4/3

12:30 p.m.-2:41 p.m.

Nonstop3h 11m

C$ 148

SeattleDenver

SEA - DEN

SEADEN

Seattle/Tacoma Intl

Sun 11/1

5:25 a.m.-11:54 a.m.

1 stop5h 29m

Denver Intl

Thu 15/1

6:29 a.m.-8:40 a.m.

Nonstop3h 11m

C$ 161

SeattleDenver

SEA - DEN

SEADEN

Seattle/Tacoma Intl

Fri 13/2

12:00 p.m.-3:50 p.m.

Nonstop2h 50m

Denver Intl

Mon 16/2

9:10 a.m.-11:19 a.m.

Nonstop3h 09m

C$ 163

SeattleDenver

SEA - DEN

SEADEN

Seattle/Tacoma Intl

Fri 6/2

5:00 a.m.-8:48 a.m.

Nonstop2h 48m

Denver Intl

Fri 6/2

4:20 p.m.-6:26 p.m.

Nonstop3h 06m

C$ 166

SeattleDenver

SEA - DEN

SEADEN

Seattle/Tacoma Intl

Fri 16/1

5:00 a.m.-8:48 a.m.

Nonstop2h 48m

Denver Intl

Sat 24/1

11:50 a.m.-1:58 p.m.

Nonstop3h 08m

C$ 171

SeattleDenver

SEA - DEN

SEADEN

Seattle/Tacoma Intl

Sun 11/1

5:25 a.m.-11:54 a.m.

1 stop5h 29m

Denver Intl

Mon 12/1

12:49 p.m.-6:29 p.m.

1 stop6h 40m

C$ 175

SeattleDenver

SEA - DEN

SEADEN

Seattle/Tacoma Intl

Fri 16/1

11:30 a.m.-10:50 p.m.

1 stop10h 20m

Denver Intl

Sat 24/1

7:00 p.m.-9:05 p.m.

Nonstop3h 05m

C$ 182

SeattleDenver

SEA - DEN

SEADEN

Seattle/Tacoma Intl

Thu 15/1

12:19 p.m.-4:10 p.m.

Nonstop2h 51m

Denver Intl

Sun 18/1

9:00 a.m.-11:09 a.m.

Nonstop3h 09m

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$ 244. If you aren’t able to travel during the month of January, then book flights to Denver from Seattle during September instead. Flights to Denver in September, while not as cheap as those in January, still average around C$ 272.

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

The cheapest day to depart from Seattle to Denver is on a Thursday. Travellers who choose to depart for Denver on a Thursday will often find tickets for as low as C$ 278. 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$ 630.

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$ 266. Try not to purchase tickets in the morning because they tend to be around C$ 407. 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$ 297 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$ 246 on momondo.

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

There are 4 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 December 2025, prices for Seattle to Denver flights are approximately 26% 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$ 163
Fastest flight time	2h 45m
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$ 163. The best round-trip flight deal from Seattle to Denver found on momondo in the last 72 hours is C$ 222.

The fastest flight from Seattle to Denver takes 2h 45m

Direct flights go from Seattle to Denver every day.

There is 1 airport in Denver. From Seattle there are direct flights to 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 45m.
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 December 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 Airbus A321neo (12.10% of total bookings). The next most popular plane models are Boeing 737-800 Passenger/BBJ2 (winglets) (11.83%), Boeing 737 MAX 9 (11.44%), and Boeing 737 MAX 8 (10.69%).
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 57% of all bookings. The subsequent popular airlines are Alaska Airlines at 13%, Delta at 11%, and Hawaiian Airlines 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$ 60	Free Cancellation	Rating 5.8 3,077 reviews	Search Frontier flights
Delta	PriceFrom C$ 81	Free Cancellation	Rating 7.9 8,014 reviews	Search Delta flights
Southwest	PriceFrom C$ 115	Free Cancellation	Rating 8.0 4,252 reviews	Search Southwest flights
Hawaiian Airlines	PriceFrom C$ 178	Free Cancellation	Rating 7.8 2,821 reviews	Search Hawaiian Airlines flights
Alaska Airlines	PriceFrom C$ 216	Free Cancellation	Rating 8.0 11,502 reviews	Search Alaska Airlines flights

Southwest Flights From Seattle to Denver
Southwest flies from Seattle to Denver around 16 times per week, with 4,252 momondo users rating the airline 8.0/10. The cheapest Southwest deal from Seattle to Denver in the last 72 hours was C$ 115 (round-trip), much lower than the average airfare cost of C$ 216 for Southwest flights on this route.
Alaska Airlines Flights From Seattle to Denver
Alaska Airlines (8.0/10 from 11,502 reviews) operates around 19 flights from Seattle to Denver in any given week. The average Alaska Airlines airfare for this route is around C$ 390, with deals from around C$ 216 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

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.

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Cheap flights from Seattle to Denver from C$ 63

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 4/2. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.

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Frontier flights from Seattle to Denver

Our best Frontier deals on Seattle to Denver flight tickets

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Our best Delta deals on Seattle to Denver flight tickets

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See travel insights to Denver from

How to get the cheapest flight ticket from Seattle to Denver

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 4 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 December 2025, prices for Seattle to Denver flights are approximately 26% 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?

United Airlines and Delta 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 18% 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 134 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, United Airlines has had the least delays on this route over the last 12 months, with about 10% of their flights experiencing any sort of delay.

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

As of December 2025, 32 flights take off from Seattle and land in Denver each day. The most common flight departure time for this route is 2:00p.m., with 45% 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 230 per week as of December 2025. The most frequent departure day is Fri, with 18% 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

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