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Cheap flights from Ottawa to Illinois from C$ 256

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Ottawa to Illinois departing on 9/5. 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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Find the cheapest flights from Ottawa to Illinois

Cheap round-trip flights

Enter your travel dates to find the best prices.
United Airlines Logo
5:25 p.m. - 9:13 p.m.
YOW
-
STL
4h 48m
1 stop
United Airlines Logo
7:45 a.m. - 9:35 p.m.
STL
-
YOW
12h 50m
1 stop
C$ 401United Airlines
Fri, 1 May - Tue, 5 May
United Airlines Logo
6:25 a.m. - 12:11 p.m.
YOW
-
STL
6h 46m
1 stop
United Airlines Logo
6:00 a.m. - 5:07 p.m.
STL
-
YOW
10h 07m
1 stop
C$ 425United Airlines
Thu, 4 Jun - Sun, 7 Jun
United Airlines Logo
5:25 p.m. - 9:13 p.m.
YOW
-
STL
4h 48m
1 stop
United Airlines Logo
6:30 a.m. - 5:07 p.m.
STL
-
YOW
9h 37m
1 stop
C$ 427United Airlines
Fri, 1 May - Tue, 5 May
United Airlines Logo
5:25 p.m. - 10:50 p.m.
YOW
-
STL
6h 25m
1 stop
United Airlines Logo
6:30 a.m. - 9:35 p.m.
STL
-
YOW
14h 05m
1 stop
C$ 428United Airlines
Fri, 1 May - Tue, 5 May
Multiple Airlines Logo
3:55 p.m. - 1:00 p.m.
YOW
-
MDW
22h 05m
1 stop
Multiple Airlines Logo
7:30 a.m. - 5:25 p.m.
MDW
-
YOW
8h 55m
1 stop
C$ 445Multiple Airlines
Wed, 22 Apr - Wed, 29 Apr
Air Canada Logo
3:00 p.m. - 8:25 p.m.
YOW
-
STL
6h 25m
1 stop
Air Canada Logo
7:05 a.m. - 1:05 p.m.
STL
-
YOW
5h 00m
1 stop
C$ 454Air Canada
Sun, 10 May - Sun, 17 May
Multiple Airlines Logo
3:30 p.m. - 9:45 a.m.
YOW
-
MDW
19h 15m
1 stop
Multiple Airlines Logo
7:30 a.m. - 5:35 p.m.
MDW
-
YOW
9h 05m
1 stop
C$ 470Multiple Airlines
Sat, 2 May - Mon, 4 May
Air Canada Logo
9:55 a.m. - 3:46 p.m.
YOW
-
STL
6h 51m
2 stops
Air Canada Logo
1:13 p.m. - 9:35 p.m.
STL
-
YOW
7h 22m
1 stop
C$ 475Air Canada
Wed, 3 Jun - Sat, 6 Jun
Delta Logo
12:25 p.m. - 11:13 p.m.
YOW
-
STL
11h 48m
2 stops
Delta Logo
6:48 a.m. - 5:35 p.m.
STL
-
YOW
9h 47m
2 stops
C$ 497Delta
Fri, 1 May - Tue, 5 May
Porter Airlines Logo
11:00 a.m. - 2:35 p.m.
YOW
-
MDW
4h 35m
1 stop
Porter Airlines Logo
10:30 a.m. - 5:54 p.m.
MDW
-
YOW
6h 24m
1 stop
C$ 557Porter Airlines
Fri, 1 May - Tue, 5 May

American Airlines flights from Ottawa to Illinois

Our best American Airlines deals on Ottawa to Illinois flight tickets
American Airlines
8 May
YOW7:00 a.m.Ottawa
6h 43m
1 stop
ORD12:43 p.m.Chicago O'Hare Intl
10 May
ORD8:06 a.m.Chicago O'Hare Intl
5h 49m
1 stop
YOW2:55 p.m.Ottawa
C$ 536
American Airlines
24 Apr
YOW6:45 a.m.Ottawa
6h 58m
1 stop
ORD12:43 p.m.Chicago O'Hare Intl
26 Apr
ORD9:50 a.m.Chicago O'Hare Intl
6h 01m
1 stop
YOW4:51 p.m.Ottawa
C$ 629
American Airlines
2 May
YOW8:40 a.m.Ottawa
6h 40m
1 stop
ORD2:20 p.m.Chicago O'Hare Intl
4 May
ORD8:06 a.m.Chicago O'Hare Intl
5h 49m
1 stop
YOW2:55 p.m.Ottawa
C$ 653

Air Canada flights from Ottawa to Illinois

Our best Air Canada deals on Ottawa to Illinois flight tickets
Air Canada
10 May
YOW3:00 p.m.Ottawa
6h 25m
1 stop
STL8:25 p.m.Lambert-St Louis
17 May
STL7:05 a.m.Lambert-St Louis
5h 00m
1 stop
YOW1:05 p.m.Ottawa
C$ 454
Air Canada
3 Jun
YOW9:55 a.m.Ottawa
6h 51m
2 stops
STL3:46 p.m.Lambert-St Louis
6 Jun
STL1:13 p.m.Lambert-St Louis
7h 22m
1 stop
YOW9:35 p.m.Ottawa
C$ 475
Air Canada
3 Jun
YOW9:55 a.m.Ottawa
6h 51m
2 stops
STL3:46 p.m.Lambert-St Louis
6 Jun
STL5:41 p.m.Lambert-St Louis
6h 55m
2 stops
YOW1:36 a.m.Ottawa
C$ 486

momondo Fare Finder

 
Customize your flight search to find flights from Ottawa to Illinois that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, momondo users made 96,600 searches. Data last updated 29 March 2026.
Use the filters below to find and compare flights from Ottawa to Illinois that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

Fri 1/5

5:25 p.m.-9:13 p.m.

1 stop4h 48m

Lambert-St Louis

Tue 5/5

7:45 a.m.-9:35 p.m.

1 stop12h 50m

C$ 401

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

Thu 4/6

6:25 a.m.-12:11 p.m.

1 stop6h 46m

Lambert-St Louis

Sun 7/6

6:00 a.m.-5:07 p.m.

1 stop10h 07m

C$ 425

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

Fri 1/5

5:25 p.m.-9:13 p.m.

1 stop4h 48m

Lambert-St Louis

Tue 5/5

6:30 a.m.-5:07 p.m.

1 stop9h 37m

C$ 426

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

Fri 1/5

5:25 p.m.-10:50 p.m.

1 stop6h 25m

Lambert-St Louis

Tue 5/5

6:30 a.m.-9:35 p.m.

1 stop14h 05m

C$ 428

OttawaChicago

YOW - MDW

YOWMDW

Ottawa

Wed 22/4

3:55 p.m.-1:00 p.m.

1 stop22h 05m

Chicago Midway

Wed 29/4

7:30 a.m.-5:25 p.m.

1 stop8h 55m

C$ 445

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

Sun 10/5

3:00 p.m.-8:25 p.m.

1 stop6h 25m

Lambert-St Louis

Sun 17/5

7:05 a.m.-1:05 p.m.

1 stop5h 00m

C$ 454

OttawaChicago

YOW - MDW

YOWMDW

Ottawa

Sat 2/5

3:30 p.m.-9:45 a.m.

1 stop19h 15m

Chicago Midway

Mon 4/5

7:30 a.m.-5:35 p.m.

1 stop9h 05m

C$ 470

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

Wed 3/6

9:55 a.m.-3:46 p.m.

2 stops6h 51m

Lambert-St Louis

Sat 6/6

1:13 p.m.-9:35 p.m.

1 stop7h 22m

C$ 475

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

Fri 1/5

12:25 p.m.-11:13 p.m.

2 stops11h 48m

Lambert-St Louis

Tue 5/5

6:48 a.m.-5:35 p.m.

2 stops9h 47m

C$ 497
Quickest round-trip

OttawaChicago

YOW - MDW

YOWMDW

Ottawa

Fri 1/5

11:00 a.m.-2:35 p.m.

1 stop4h 35m

Chicago Midway

Tue 5/5

10:30 a.m.-5:54 p.m.

1 stop6h 24m

C$ 557

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to Illinois from

How to get the cheapest flight ticket from Ottawa to Illinois

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 Illinois?

In general, February is the cheapest month to fly from Ottawa to Illinois. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around C$ 351. If you don’t want to visit Illinois in February, then you should wait until May to fly from Ottawa, when ticket prices are also cheap, with an average price of C$ 393.

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

According to our data, Saturday is the cheapest day to fly to Illinois from Ottawa. The lowest ticket price found for a Saturday departure recently was C$ 712. Keep in mind that prices can always vary depending on your route and whether or not you are flying domestic or international. The most expensive day to fly to Illinois is Monday, with ticket prices averaging around C$ 939.

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

Our most recent data shows that the best time of day to fly to Illinois is in the afternoon. Flights from Ottawa to Illinois during this time can be as low as C$ 745. If you have a flexible travel schedule, then try to avoid flying in the morning when prices are C$ 858 on average. Flights to Illinois from Ottawa in the morning are generally more expensive because this time of day is more convenient for travellers’ schedules.

What is the cheapest Ottawa to Illinois flight route?

Fly from Ottawa to Chicago O'Hare Intl for the best Ottawa - Illinois flight prices

What cabin class options are available on Ottawa to Illinois flights?

There are 4 cabin classes available to choose from on Ottawa to Illinois flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Can stopping save me money on Ottawa to Illinois flights?

You could potentially save up to 66% on your flight if you consider stops on a Ottawa to Illinois flight.

Cheap Ottawa to Illinois flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Ottawa to Illinois

Best price found

C$ 277

Fastest flight time

2h 20m

Direct flights

Every day

Airports in Illinois

98 airports
The best one-way flight to Illinois from Ottawa in the past 72 hours is C$ 277. The best round-trip flight deal from Ottawa to Illinois found on momondo in the last 72 hours is C$ 558.
The fastest flight from Ottawa to Illinois takes 2h 20m
Direct flights go from Ottawa to Illinois every day.
There are 98 airports in Illinois. From Ottawa there are direct flights to Chicago O'Hare Intl (ORD).
Search flight deals

  • When did momondo last update prices for flights from Ottawa Airport to Illinois?

    Prices for flights from Ottawa Airport to Illinois were last updated today.

  • How many operators does momondo search for flights from Ottawa Airport to Illinois?

  • How old do you have to be to fly from Ottawa Airport to Illinois?

    The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Ottawa Airport to Illinois.

  • What documentation or ID do you need to fly to Illinois?

    The travel and health documents you'll need for your trip to Illinois may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Illinois. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

  • What is the most popular plane model from Ottawa to Illinois?

Best airlines flying from Ottawa to Illinois

Compare and see reviews for airlines that fly from Ottawa to Illinois with momondo
Airline
Rating
Free Cancellation
Price
Porter AirlinesPriceFrom C$ 322Free CancellationRating
8.0
430 reviews
Search Porter Airlines flights
United AirlinesPriceFrom C$ 466Free CancellationRating
7.4
9,508 reviews
Search United Airlines flights
Air CanadaPriceFrom C$ 481Free CancellationRating
7.1
10,856 reviews
Search Air Canada flights

Why use momondo?

Why should I use momondo to find a flight deal from Ottawa to Illinois?

Finding the right flight to Illinois from Ottawa is quick and easy when you have a range of options in front of you, from reputable agents and recognizable airlines. Options that can then be filtered down to find the best fit. That is what momondo does. We make finding flights to Illinois quick and easy, saving you time and money.

Can I find flights from Ottawa to Illinois with flexible booking policies on momondo?

Yes. All flights to Illinois from Ottawa on momondo can be compared and filtered by various policies on offer, including flexible booking.

How can momondo help me find flights from Ottawa to Illinois?

Once you have performed a search in the form on the page, momondo provides useful filters and insights. We can show you the cheapest days and times to fly as well as help filter your options to help you make an informed choice when booking flights to Illinois from Ottawa.

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

Price alerts on flights to Illinois from Ottawa are quick and easy to set up on momondo. Simply perform a search and select the price alert feature. It is as simple as that.

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