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Cheap flights from Ottawa to Illinois from C$ 281

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 10/9. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
1 adult, Economy, 0 bags

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from Ottawa to Illinois

Cheap round-trip flights

Enter your travel dates to find the best prices.
Porter Airlines Logo
5:55 p.m. - 9:35 p.m.
YOW
-
ORD
4h 40m
1 stop
Porter Airlines Logo
11:45 a.m. - 8:09 p.m.
ORD
-
YOW
7h 24m
1 stop
C$ 512Porter Airlines
Fri, 23 Oct - Sun, 25 Oct
Multiple Airlines Logo
6:55 a.m. - 2:35 p.m.
YOW
-
ORD
8h 40m
1 stop
Multiple Airlines Logo
7:00 a.m. - 12:54 p.m.
ORD
-
YOW
4h 54m
1 stop
C$ 523Multiple Airlines
Thu, 15 Oct - Wed, 21 Oct
Multiple Airlines Logo
7:00 a.m. - 12:50 p.m.
YOW
-
ORD
30h 50m
1 stop
Multiple Airlines Logo
7:00 a.m. - 12:54 p.m.
ORD
-
YOW
4h 54m
1 stop
C$ 533Multiple Airlines
Mon, 31 Aug - Sat, 5 Sep
Multiple Airlines Logo
6:55 a.m. - 2:35 p.m.
YOW
-
ORD
8h 40m
1 stop
Multiple Airlines Logo
3:20 p.m. - 8:04 p.m.
ORD
-
YOW
3h 44m
1 stop
C$ 534Multiple Airlines
Thu, 10 Sep - Thu, 17 Sep
United Airlines Logo
6:00 a.m. - 11:00 a.m.
YOW
-
STL
6h 00m
1 stop
United Airlines Logo
5:00 a.m. - 9:16 p.m.
STL
-
YOW
15h 16m
1 stop
C$ 536United Airlines
Sat, 31 Oct - Wed, 4 Nov
United Airlines Logo
3:10 p.m. - 9:51 p.m.
YOW
-
STL
7h 41m
1 stop
United Airlines Logo
7:33 a.m. - 9:16 p.m.
STL
-
YOW
12h 43m
1 stop
C$ 537United Airlines
Tue, 27 Oct - Tue, 3 Nov
American Airlines Logo
8:40 a.m. - 2:20 p.m.
YOW
-
ORD
6h 40m
1 stop
American Airlines Logo
8:09 a.m. - 2:55 p.m.
ORD
-
YOW
5h 46m
1 stop
C$ 560American Airlines
Thu, 20 Aug - Sun, 23 Aug
Air Canada Logo
9:00 a.m. - 2:02 p.m.
YOW
-
STL
6h 02m
1 stop
Air Canada Logo
8:55 a.m. - 3:10 p.m.
STL
-
YOW
5h 15m
1 stop
C$ 561Air Canada
Fri, 28 Aug - Sun, 30 Aug
American Airlines Logo
8:40 a.m. - 2:20 p.m.
YOW
-
ORD
6h 40m
1 stop
American Airlines Logo
8:09 a.m. - 2:55 p.m.
ORD
-
YOW
5h 46m
1 stop
C$ 561American Airlines
Thu, 20 Aug - Sun, 23 Aug
Air Canada Logo
4:00 p.m. - 8:24 p.m.
YOW
-
STL
5h 24m
1 stop
Air Canada Logo
8:55 a.m. - 3:10 p.m.
STL
-
YOW
5h 15m
1 stop
C$ 566Air Canada
Fri, 14 Aug - Fri, 21 Aug

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Porter Airlines flights from Ottawa to Illinois

Our best Porter Airlines deals on Ottawa to Illinois flight tickets
Porter Airlines
23 Oct
YOW5:55 p.m.Ottawa
4h 40m
1 stop
ORD9:35 p.m.Chicago O'Hare Intl
25 Oct
ORD11:45 a.m.Chicago O'Hare Intl
7h 24m
1 stop
YOW8:09 p.m.Ottawa
C$ 512
Porter Airlines
4 Sep
YOW8:00 a.m.Ottawa
7h 35m
1 stop
ORD2:35 p.m.Chicago O'Hare Intl
7 Sep
ORD7:00 a.m.Chicago O'Hare Intl
4h 54m
1 stop
YOW12:54 p.m.Ottawa
C$ 537
Porter Airlines
1 Sep
YOW8:00 a.m.Ottawa
4h 00m
1 stop
ORD11:00 a.m.Chicago O'Hare Intl
5 Sep
ORD11:45 a.m.Chicago O'Hare Intl
6h 24m
1 stop
YOW7:09 p.m.Ottawa
C$ 549

American Airlines flights from Ottawa to Illinois

Our best American Airlines deals on Ottawa to Illinois flight tickets
American Airlines
20 Aug
YOW8:40 a.m.Ottawa
6h 40m
1 stop
ORD2:20 p.m.Chicago O'Hare Intl
23 Aug
ORD8:09 a.m.Chicago O'Hare Intl
5h 46m
1 stop
YOW2:55 p.m.Ottawa
C$ 560
American Airlines
20 Aug
YOW8:40 a.m.Ottawa
6h 40m
1 stop
ORD2:20 p.m.Chicago O'Hare Intl
23 Aug
ORD8:09 a.m.Chicago O'Hare Intl
5h 46m
1 stop
YOW2:55 p.m.Ottawa
C$ 561
American Airlines
21 Jul
YOW7:00 a.m.Ottawa
6h 44m
1 stop
ORD12:44 p.m.Chicago O'Hare Intl
18 Aug
ORD8:09 a.m.Chicago O'Hare Intl
5h 46m
1 stop
YOW2:55 p.m.Ottawa
C$ 571

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 2 July 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

OttawaChicago

YOW - ORD

YOWORD

Ottawa

Fri 23/10

5:55 p.m.-9:35 p.m.

1 stop4h 40m

Chicago O'Hare Intl

Sun 25/10

11:45 a.m.-8:09 p.m.

1 stop7h 24m

C$ 512

OttawaChicago

YOW - ORD

YOWORD

Ottawa

Thu 15/10

6:55 a.m.-2:35 p.m.

1 stop8h 40m

Chicago O'Hare Intl

Wed 21/10

7:00 a.m.-12:54 p.m.

1 stop4h 54m

C$ 523

OttawaChicago

YOW - ORD

YOWORD

Ottawa

Mon 31/8

7:00 a.m.-12:50 p.m.

1 stop30h 50m

Chicago O'Hare Intl

Sat 5/9

7:00 a.m.-12:54 p.m.

1 stop4h 54m

C$ 533

OttawaChicago

YOW - ORD

YOWORD

Ottawa

Thu 10/9

6:55 a.m.-2:35 p.m.

1 stop8h 40m

Chicago O'Hare Intl

Thu 17/9

3:20 p.m.-8:04 p.m.

1 stop3h 44m

C$ 534

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

Sat 31/10

6:00 a.m.-11:00 a.m.

1 stop6h 00m

Lambert-St Louis

Wed 4/11

5:00 a.m.-9:16 p.m.

1 stop15h 16m

C$ 536

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

Tue 27/10

3:10 p.m.-9:51 p.m.

1 stop7h 41m

Lambert-St Louis

Tue 3/11

7:33 a.m.-9:16 p.m.

1 stop12h 43m

C$ 537

OttawaChicago

YOW - ORD

YOWORD

Ottawa

Thu 20/8

8:40 a.m.-2:20 p.m.

1 stop6h 40m

Chicago O'Hare Intl

Sun 23/8

8:09 a.m.-2:55 p.m.

1 stop5h 46m

C$ 560

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

Fri 28/8

9:00 a.m.-2:02 p.m.

1 stop6h 02m

Lambert-St Louis

Sun 30/8

8:55 a.m.-3:10 p.m.

1 stop5h 15m

C$ 561

OttawaChicago

YOW - ORD

YOWORD

Ottawa

Thu 20/8

8:40 a.m.-2:20 p.m.

1 stop6h 40m

Chicago O'Hare Intl

Sun 23/8

8:09 a.m.-2:55 p.m.

1 stop5h 46m

C$ 561
Quickest round-trip

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

Fri 14/8

4:00 p.m.-8:24 p.m.

1 stop5h 24m

Lambert-St Louis

Fri 21/8

8:55 a.m.-3:10 p.m.

1 stop5h 15m

C$ 566

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, August 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$ 186. If you don’t want to visit Illinois in August, then you should wait until October to fly from Ottawa, when ticket prices are also cheap, with an average price of C$ 303.

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$ 752. 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$ 1,022.

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$ 751. If you have a flexible travel schedule, then try to avoid flying in the morning when prices are C$ 859 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 35% 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$ 502

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$ 502. The best round-trip flight deal from Ottawa to Illinois found on momondo in the last 72 hours is C$ 699.
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

Frequently asked questions about flying from Ottawa to Illinois

  • 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
Air CanadaPriceFrom C$ 426Free CancellationRating
7.1
11,287 reviews
Search Air Canada flights
United AirlinesPriceFrom C$ 478Free CancellationRating
7.4
9,926 reviews
Search United Airlines 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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