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Cheap flights from Ottawa to Illinois from C$ 220

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 24/3. 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
11:00 a.m. - 12:40 a.m.
YOW
-
ORD
14h 40m
2 stops
Multiple Airlines Logo
6:01 p.m. - 5:25 p.m.
ORD
-
YOW
22h 24m
1 stop
C$ 398Multiple Airlines
Tue, 10 Mar - Tue, 17 Mar
Multiple Airlines Logo
3:55 p.m. - 12:40 a.m.
YOW
-
ORD
9h 45m
1 stop
Multiple Airlines Logo
6:01 p.m. - 5:25 p.m.
ORD
-
YOW
22h 24m
1 stop
C$ 399Multiple Airlines
Tue, 10 Mar - Tue, 17 Mar
United Airlines Logo
5:48 p.m. - 11:59 p.m.
YOW
-
STL
7h 11m
1 stop
United Airlines Logo
7:00 a.m. - 1:34 p.m.
STL
-
YOW
5h 34m
1 stop
C$ 411United Airlines
Mon, 23 Feb - Wed, 25 Feb
Multiple Airlines Logo
3:35 p.m. - 12:22 a.m.
YOW
-
ORD
9h 47m
2 stops
Multiple Airlines Logo
6:01 p.m. - 5:25 p.m.
ORD
-
YOW
22h 24m
1 stop
C$ 425Multiple Airlines
Wed, 25 Mar - Wed, 1 Apr
Multiple Airlines Logo
3:55 p.m. - 12:22 a.m.
YOW
-
ORD
9h 27m
1 stop
Multiple Airlines Logo
6:01 p.m. - 5:25 p.m.
ORD
-
YOW
22h 24m
1 stop
C$ 426Multiple Airlines
Wed, 25 Mar - Wed, 1 Apr
Multiple Airlines Logo
3:35 p.m. - 12:22 a.m.
YOW
-
ORD
9h 47m
2 stops
Multiple Airlines Logo
6:01 p.m. - 5:25 p.m.
ORD
-
YOW
22h 24m
1 stop
C$ 428Multiple Airlines
Sat, 21 Mar - Tue, 24 Mar
United Airlines Logo
10:44 a.m. - 9:08 p.m.
YOW
-
STL
11h 24m
1 stop
United Airlines Logo
7:45 a.m. - 5:07 p.m.
STL
-
YOW
8h 22m
1 stop
C$ 432United Airlines
Thu, 9 Apr - Sat, 11 Apr
United Airlines Logo
5:11 p.m. - 9:23 p.m.
YOW
-
STL
5h 12m
1 stop
United Airlines Logo
11:15 a.m. - 5:07 p.m.
STL
-
YOW
4h 52m
1 stop
C$ 436United Airlines
Fri, 27 Mar - Mon, 30 Mar
United Airlines Logo
10:00 a.m. - 9:08 p.m.
YOW
-
STL
12h 08m
2 stops
United Airlines Logo
7:45 a.m. - 5:07 p.m.
STL
-
YOW
8h 22m
1 stop
C$ 446United Airlines
Thu, 9 Apr - Sat, 11 Apr
Air Canada Logo
7:15 a.m. - 3:29 p.m.
YOW
-
STL
9h 14m
1 stop
Air Canada Logo
4:05 p.m. - 11:18 p.m.
STL
-
YOW
6h 13m
1 stop
C$ 502Air Canada
Sun, 1 Mar - Wed, 4 Mar

WestJet flights from Ottawa to Illinois

Our best WestJet deals on Ottawa to Illinois flight tickets
WestJet
9 Apr
YOW5:45 p.m.Ottawa
20h 50m
1 stop
ORD1:35 p.m.Chicago O'Hare Intl
8 May
ORD5:30 p.m.Chicago O'Hare Intl
11h 10m
1 stop
YOW5:40 a.m.Ottawa
C$ 578
WestJet
9 Apr
YOW5:45 p.m.Ottawa
20h 50m
1 stop
ORD1:35 p.m.Chicago O'Hare Intl
8 May
ORD5:30 p.m.Chicago O'Hare Intl
18h 00m
2 stops
YOW12:30 p.m.Ottawa
C$ 589
WestJet
18 Apr
YOW5:40 a.m.Ottawa
14h 43m
2 stops
ORD7:23 p.m.Chicago O'Hare Intl
20 Apr
ORD11:19 a.m.Chicago O'Hare Intl
12h 20m
2 stops
YOW12:39 a.m.Ottawa
C$ 596

American Airlines flights from Ottawa to Illinois

Our best American Airlines deals on Ottawa to Illinois flight tickets
American Airlines
9 Apr
YOW6:45 a.m.Ottawa
10h 56m
2 stops
STL4:41 p.m.Lambert-St Louis
11 Apr
STL5:21 p.m.Lambert-St Louis
24h 05m
2 stops
YOW6:26 p.m.Ottawa
C$ 638
American Airlines
27 Mar
YOW6:45 a.m.Ottawa
17h 50m
2 stops
STL11:35 p.m.Lambert-St Louis
30 Mar
STL3:33 p.m.Lambert-St Louis
24h 15m
2 stops
YOW4:48 p.m.Ottawa
C$ 756
American Airlines
13 Feb
YOW6:40 a.m.Ottawa
6h 55m
1 stop
ORD12:35 p.m.Chicago O'Hare Intl
14 Feb
ORD5:35 a.m.Chicago O'Hare Intl
11h 23m
2 stops
YOW5:58 p.m.Ottawa
C$ 1,119

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 9 February 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

OttawaChicago

YOW - ORD

YOWORD

Ottawa

Tue 10/3

11:00 a.m.-12:40 a.m.

2 stops14h 40m

Chicago O'Hare Intl

Tue 17/3

6:01 p.m.-5:25 p.m.

1 stop22h 24m

C$ 398

OttawaChicago

YOW - ORD

YOWORD

Ottawa

Tue 10/3

3:55 p.m.-12:40 a.m.

1 stop9h 45m

Chicago O'Hare Intl

Tue 17/3

6:01 p.m.-5:25 p.m.

1 stop22h 24m

C$ 399

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

Mon 23/2

5:48 p.m.-11:59 p.m.

1 stop7h 11m

Lambert-St Louis

Wed 25/2

7:00 a.m.-1:34 p.m.

1 stop5h 34m

C$ 411

OttawaChicago

YOW - ORD

YOWORD

Ottawa

Wed 25/3

3:35 p.m.-12:22 a.m.

2 stops9h 47m

Chicago O'Hare Intl

Wed 1/4

6:01 p.m.-5:25 p.m.

1 stop22h 24m

C$ 425

OttawaChicago

YOW - ORD

YOWORD

Ottawa

Wed 25/3

3:55 p.m.-12:22 a.m.

1 stop9h 27m

Chicago O'Hare Intl

Wed 1/4

6:01 p.m.-5:25 p.m.

1 stop22h 24m

C$ 426

OttawaChicago

YOW - ORD

YOWORD

Ottawa

Sat 21/3

3:35 p.m.-12:22 a.m.

2 stops9h 47m

Chicago O'Hare Intl

Tue 24/3

6:01 p.m.-5:25 p.m.

1 stop22h 24m

C$ 428

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

Thu 9/4

10:44 a.m.-9:08 p.m.

1 stop11h 24m

Lambert-St Louis

Sat 11/4

7:45 a.m.-5:07 p.m.

1 stop8h 22m

C$ 432

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

Fri 27/3

5:11 p.m.-9:23 p.m.

1 stop5h 12m

Lambert-St Louis

Mon 30/3

11:15 a.m.-5:07 p.m.

1 stop4h 52m

C$ 436

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

Thu 9/4

10:00 a.m.-9:08 p.m.

2 stops12h 08m

Lambert-St Louis

Sat 11/4

7:45 a.m.-5:07 p.m.

1 stop8h 22m

C$ 446

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

Sun 1/3

7:15 a.m.-3:29 p.m.

1 stop9h 14m

Lambert-St Louis

Wed 4/3

4:05 p.m.-11:18 p.m.

1 stop6h 13m

C$ 502

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$ 394. 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$ 487.

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$ 686. 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$ 894.

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$ 705. If you have a flexible travel schedule, then try to avoid flying in the morning when prices are C$ 833 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 74% 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$ 346

Fastest flight time

2h 08m

Direct flights

Mon, Wed, Thu, Fri, Sat and Sun

Airports in Illinois

98 airports
The best one-way flight to Illinois from Ottawa in the past 72 hours is C$ 346. The best round-trip flight deal from Ottawa to Illinois found on momondo in the last 72 hours is C$ 562.
The fastest flight from Ottawa to Illinois takes 2h 08m
Direct flights go from Ottawa to Illinois on Monday, Wednesday, Thursday, Friday, Saturday and Sunday. There are no airlines offering direct flights.
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$ 317Free CancellationRating
7.9
414 reviews
Search Porter Airlines flights
United AirlinesPriceFrom C$ 458Free CancellationRating
7.4
9,259 reviews
Search United Airlines flights
Air CanadaPriceFrom C$ 498Free CancellationRating
7.1
10,698 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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