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Cheap flights from Ottawa to Illinois from C$ 231

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 5/2. 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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Find the cheapest flights from Ottawa to Illinois

Cheap round-trip flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
9:30 a.m. - 10:37 p.m.YOW-STL
14h 07m1 stop
Multiple Airlines Logo
5:11 p.m. - 5:13 p.m.STL-YOW
23h 02m1 stop
C$ 362Multiple Airlines
Find Deal
Fri, 16 Jan - Sun, 25 Jan
Multiple Airlines Logo
4:15 p.m. - 11:08 a.m.YOW-ORD
19h 53m1 stop
Multiple Airlines Logo
6:15 a.m. - 12:25 a.m.ORD-YOW
17h 10m1 stop
C$ 400Multiple Airlines
Find Deal
Mon, 8 Dec - Thu, 11 Dec
United Airlines Logo
5:55 p.m. - 11:59 p.m.YOW-STL
7h 04m1 stop
United Airlines Logo
8:05 a.m. - 5:12 p.m.STL-YOW
8h 07m1 stop
C$ 422United Airlines
Find Deal
Fri, 23 Jan - Sun, 25 Jan
Air Canada Logo
2:50 p.m. - 10:58 p.m.YOW-STL
9h 08m2 stops
Air Canada Logo
6:30 a.m. - 5:42 p.m.STL-YOW
10h 12m2 stops
C$ 496Air Canada
Find Deal
Fri, 23 Jan - Sun, 25 Jan
Air Canada Logo
2:50 p.m. - 10:58 p.m.YOW-STL
9h 08m2 stops
Air Canada Logo
6:30 a.m. - 5:42 p.m.STL-YOW
10h 12m2 stops
C$ 497Air Canada
Find Deal
Fri, 23 Jan - Sun, 25 Jan
United Airlines Logo
6:00 a.m. - 12:29 p.m.YOW-STL
7h 29m2 stops
United Airlines Logo
6:30 a.m. - 2:30 p.m.STL-YOW
7h 00m2 stops
C$ 505United Airlines
Find Deal
Fri, 16 Jan - Sun, 25 Jan
Porter Airlines Logo
8:40 a.m. - 3:20 p.m.YOW-MDW
7h 40m1 stop
Porter Airlines Logo
11:00 a.m. - 5:29 p.m.MDW-YOW
5h 29m1 stop
C$ 560Porter Airlines
Find Deal
Fri, 5 Dec - Mon, 8 Dec
WestJet Logo
5:45 p.m. - 1:35 p.m.YOW-ORD
20h 50m1 stop
WestJet Logo
2:20 p.m. - 12:40 a.m.ORD-YOW
9h 20m1 stop
C$ 577WestJet
Find Deal
Thu, 26 Feb - Mon, 2 Mar
Porter Airlines Logo
8:40 a.m. - 11:50 a.m.YOW-MDW
4h 10m1 stop
Porter Airlines Logo
11:00 a.m. - 7:54 p.m.MDW-YOW
7h 54m1 stop
C$ 600Porter Airlines
Find Deal
Sat, 6 Dec - Mon, 8 Dec
WestJet Logo
5:40 a.m. - 1:10 p.m.YOW-MDW
32h 30m2 stops
WestJet Logo
10:49 a.m. - 12:42 a.m.MDW-YOW
12h 53m2 stops
C$ 639WestJet
Find Deal
Sat, 6 Dec - Mon, 8 Dec

WestJet flights from Ottawa to Illinois

Our best WestJet deals on Ottawa to Illinois flight tickets
WestJet
26 Feb
YOW5:45 p.m.Ottawa
20h 50m
1 stop
ORD1:35 p.m.Chicago O'Hare Intl
2 Mar
ORD2:20 p.m.Chicago O'Hare Intl
9h 20m
1 stop
YOW12:40 a.m.Ottawa
C$ 577
Find similar
WestJet
6 Dec
YOW5:40 a.m.Ottawa
32h 30m
2 stops
MDW1:10 p.m.Chicago Midway
8 Dec
MDW10:49 a.m.Chicago Midway
12h 53m
2 stops
YOW12:42 a.m.Ottawa
C$ 639
Find similar
WestJet
2 Dec
YOW5:40 a.m.Ottawa
29h 14m
2 stops
MDW9:54 a.m.Chicago Midway
7 Dec
MDW10:49 a.m.Chicago Midway
12h 53m
2 stops
YOW12:42 a.m.Ottawa
C$ 659
Find similar

Air Canada flights from Ottawa to Illinois

Our best Air Canada deals on Ottawa to Illinois flight tickets
Air Canada
23 Jan
YOW2:50 p.m.Ottawa
9h 08m
2 stops
STL10:58 p.m.Lambert-St Louis
25 Jan
STL6:30 a.m.Lambert-St Louis
10h 12m
2 stops
YOW5:42 p.m.Ottawa
C$ 496
Find similar
Air Canada
23 Jan
YOW2:50 p.m.Ottawa
9h 08m
2 stops
STL10:58 p.m.Lambert-St Louis
25 Jan
STL6:30 a.m.Lambert-St Louis
10h 12m
2 stops
YOW5:42 p.m.Ottawa
C$ 497
Find similar
Air Canada
7 Apr
YOW5:45 a.m.Ottawa
9h 33m
2 stops
STL2:18 p.m.Lambert-St Louis
8 Apr
STL4:05 p.m.Lambert-St Louis
5h 59m
1 stop
YOW11:04 p.m.Ottawa
C$ 504
Find similar

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 5 November 2025.
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

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

Fri 16/1

9:30 a.m.-10:37 p.m.

1 stop14h 07m

Lambert-St Louis

Sun 25/1

5:11 p.m.-5:13 p.m.

1 stop23h 02m

C$ 362

OttawaChicago

YOW - ORD

YOWORD

Ottawa

Mon 8/12

4:15 p.m.-11:08 a.m.

1 stop19h 53m

Chicago O'Hare Intl

Thu 11/12

6:15 a.m.-12:25 a.m.

1 stop17h 10m

C$ 400

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

Fri 23/1

5:55 p.m.-11:59 p.m.

1 stop7h 04m

Lambert-St Louis

Sun 25/1

8:05 a.m.-5:12 p.m.

1 stop8h 07m

C$ 422

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

Fri 23/1

2:50 p.m.-10:58 p.m.

2 stops9h 08m

Lambert-St Louis

Sun 25/1

6:30 a.m.-5:42 p.m.

2 stops10h 12m

C$ 496

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

Fri 23/1

2:50 p.m.-10:58 p.m.

2 stops9h 08m

Lambert-St Louis

Sun 25/1

6:30 a.m.-5:42 p.m.

2 stops10h 12m

C$ 497

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

Fri 16/1

6:00 a.m.-12:29 p.m.

2 stops7h 29m

Lambert-St Louis

Sun 25/1

6:30 a.m.-2:30 p.m.

2 stops7h 00m

C$ 505

OttawaChicago

YOW - MDW

YOWMDW

Ottawa

Fri 5/12

8:40 a.m.-3:20 p.m.

1 stop7h 40m

Chicago Midway

Mon 8/12

11:00 a.m.-5:29 p.m.

1 stop5h 29m

C$ 560

OttawaChicago

YOW - ORD

YOWORD

Ottawa

Thu 26/2

5:45 p.m.-1:35 p.m.

1 stop20h 50m

Chicago O'Hare Intl

Mon 2/3

2:20 p.m.-12:40 a.m.

1 stop9h 20m

C$ 577

OttawaChicago

YOW - MDW

YOWMDW

Ottawa

Sat 6/12

8:40 a.m.-11:50 a.m.

1 stop4h 10m

Chicago Midway

Mon 8/12

11:00 a.m.-7:54 p.m.

1 stop7h 54m

C$ 600

OttawaChicago

YOW - MDW

YOWMDW

Ottawa

Sat 6/12

5:40 a.m.-1:10 p.m.

2 stops32h 30m

Chicago Midway

Mon 8/12

10:49 a.m.-12:42 a.m.

2 stops12h 53m

C$ 639

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, May 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$ 477. If you don’t want to visit Illinois in May, then you should wait until June to fly from Ottawa, when ticket prices are also cheap, with an average price of C$ 504.

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$ 782. 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 Sunday, 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 at noon. Flights from Ottawa to Illinois during this time can be as low as C$ 515. If you have a flexible travel schedule, then try to avoid flying in the morning when prices are C$ 903 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

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

You are more likely to see cheaper flights to Illinois from Ottawa when booking weeks ahead of your departure date. In general, you can expect to find flights to Illinois for around C$ 734 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Illinois from Ottawa for as low as C$ 500 on momondo.

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 37% 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$ 335

Fastest flight time

2h 41m

Direct flights

Every day

Airports in Illinois

1 airport
The best one-way flight to Illinois from Ottawa in the past 72 hours is C$ 335. The best round-trip flight deal from Ottawa to Illinois found on momondo in the last 72 hours is C$ 565.
The fastest flight from Ottawa to Illinois takes 2h 41m
Direct flights go from Ottawa to Illinois every day.
There is 1 airport near Illinois: 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$ 378Free CancellationRating
8.0
387 reviews
Search Porter Airlines flights
United AirlinesPriceFrom C$ 474Free CancellationRating
7.4
9,001 reviews
Search United Airlines flights
Air CanadaPriceFrom C$ 501Free CancellationRating
7.1
10,404 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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