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Cheap flights from Ottawa to Illinois from $203

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 6/3. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
0 bags

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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
2:48 pm - 11:37 pm
YOW
-
STL
9h 49m
1 stop
United Airlines Logo
7:01 am - 9:56 pm
STL
-
YOW
13h 55m
1 stop
$339United Airlines
Fri, Sep 11 - Mon, Sep 14
United Airlines Logo
6:25 am - 3:46 pm
YOW
-
STL
10h 21m
1 stop
United Airlines Logo
6:00 am - 6:48 pm
STL
-
YOW
11h 48m
2 stops
$350United Airlines
Thu, Jul 9 - Sat, Jul 11
Air Canada Logo
2:35 pm - 6:42 pm
YOW
-
STL
5h 07m
1 stop
Air Canada Logo
8:55 am - 3:10 pm
STL
-
YOW
5h 15m
1 stop
$357Air Canada
Wed, Aug 26 - Sun, Aug 30
Multiple Airlines Logo
6:55 am - 9:35 am
YOW
-
MDW
27h 40m
1 stop
Multiple Airlines Logo
10:15 am - 12:20 am
MDW
-
YOW
13h 05m
1 stop
$388Multiple Airlines
Wed, Jun 10 - Wed, Jun 17
Multiple Airlines Logo
6:55 am - 2:35 pm
YOW
-
MDW
8h 40m
1 stop
Multiple Airlines Logo
10:15 am - 9:51 pm
MDW
-
YOW
10h 36m
1 stop
$407Multiple Airlines
Thu, Jun 11 - Sun, Jun 14
Air Canada Logo
2:40 pm - 8:25 pm
YOW
-
STL
6h 45m
1 stop
Air Canada Logo
1:13 pm - 1:36 am
STL
-
YOW
11h 23m
2 stops
$410Air Canada
Wed, Jun 3 - Sat, Jun 6
American Airlines Logo
7:00 am - 12:45 pm
YOW
-
ORD
6h 45m
1 stop
American Airlines Logo
8:08 am - 2:55 pm
ORD
-
YOW
5h 47m
1 stop
$429American Airlines
Wed, May 27 - Fri, May 29
Porter Airlines Logo
11:00 am - 2:35 pm
YOW
-
MDW
4h 35m
1 stop
Porter Airlines Logo
10:15 am - 2:54 pm
MDW
-
YOW
3h 39m
1 stop
$447Porter Airlines
Sun, Jun 14 - Mon, Jun 15
Porter Airlines Logo
11:00 am - 2:35 pm
YOW
-
MDW
4h 35m
1 stop
Porter Airlines Logo
3:20 pm - 8:04 pm
MDW
-
YOW
3h 44m
1 stop
$455Porter Airlines
Thu, Jun 11 - Mon, Jun 15
American Airlines Logo
8:40 am - 2:22 pm
YOW
-
ORD
6h 42m
1 stop
American Airlines Logo
8:10 am - 2:55 pm
ORD
-
YOW
5h 45m
1 stop
$455American Airlines
Wed, Jul 29 - Fri, Jul 31

Air Canada flights from Ottawa to Illinois

Our best Air Canada deals on Ottawa to Illinois flight tickets
Air Canada
Aug 26
YOW2:35 pmOttawa
5h 07m
1 stop
STL6:42 pmLambert-St Louis
Aug 30
STL8:55 amLambert-St Louis
5h 15m
1 stop
YOW3:10 pmOttawa
$357
Air Canada
Jun 3
YOW2:40 pmOttawa
6h 45m
1 stop
STL8:25 pmLambert-St Louis
Jun 6
STL1:13 pmLambert-St Louis
11h 23m
2 stops
YOW1:36 amOttawa
$410
Air Canada
Jun 3
YOW9:55 amOttawa
6h 51m
2 stops
STL3:46 pmLambert-St Louis
Jun 6
STL1:13 pmLambert-St Louis
11h 23m
2 stops
YOW1:36 amOttawa
$413

Porter Airlines flights from Ottawa to Illinois

Our best Porter Airlines deals on Ottawa to Illinois flight tickets
Porter Airlines
Jun 14
YOW11:00 amOttawa
4h 35m
1 stop
MDW2:35 pmChicago Midway
Jun 15
MDW10:15 amChicago Midway
3h 39m
1 stop
YOW2:54 pmOttawa
$447
Porter Airlines
Jun 11
YOW11:00 amOttawa
4h 35m
1 stop
MDW2:35 pmChicago Midway
Jun 15
MDW3:20 pmChicago Midway
3h 44m
1 stop
YOW8:04 pmOttawa
$455
Porter Airlines
Jun 9
YOW5:55 pmOttawa
16h 40m
1 stop
MDW9:35 amChicago Midway
Jun 16
MDW10:15 amChicago Midway
22h 09m
1 stop
YOW9:24 amOttawa
$457

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 832,500 searches. Data last updated May 15, 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 9/11

2:48 pm-11:37 pm

1 stop9h 49m

Lambert-St Louis

Mon 9/14

7:01 am-9:56 pm

1 stop13h 55m

$339

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

Thu 7/9

6:25 am-3:46 pm

1 stop10h 21m

Lambert-St Louis

Sat 7/11

6:00 am-6:48 pm

2 stops11h 48m

$350

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

Wed 8/26

2:35 pm-6:42 pm

1 stop5h 07m

Lambert-St Louis

Sun 8/30

8:55 am-3:10 pm

1 stop5h 15m

$357

OttawaChicago

YOW - MDW

YOWMDW

Ottawa

Wed 6/10

6:55 am-9:35 am

1 stop27h 40m

Chicago Midway

Wed 6/17

10:15 am-12:20 am

1 stop13h 05m

$388

OttawaChicago

YOW - MDW

YOWMDW

Ottawa

Thu 6/11

6:55 am-2:35 pm

1 stop8h 40m

Chicago Midway

Sun 6/14

10:15 am-9:51 pm

1 stop10h 36m

$407

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

Wed 6/3

2:40 pm-8:25 pm

1 stop6h 45m

Lambert-St Louis

Sat 6/6

1:13 pm-1:36 am

2 stops11h 23m

$410

OttawaChicago

YOW - ORD

YOWORD

Ottawa

Wed 5/27

7:00 am-12:45 pm

1 stop6h 45m

Chicago O'Hare Intl

Fri 5/29

8:08 am-2:55 pm

1 stop5h 47m

$429
Quickest round-trip

OttawaChicago

YOW - MDW

YOWMDW

Ottawa

Sun 6/14

11:00 am-2:35 pm

1 stop4h 35m

Chicago Midway

Mon 6/15

10:15 am-2:54 pm

1 stop3h 39m

$447

OttawaChicago

YOW - MDW

YOWMDW

Ottawa

Thu 6/11

11:00 am-2:35 pm

1 stop4h 35m

Chicago Midway

Mon 6/15

3:20 pm-8:04 pm

1 stop3h 44m

$455

OttawaChicago

YOW - ORD

YOWORD

Ottawa

Wed 7/29

8:40 am-2:22 pm

1 stop6h 42m

Chicago O'Hare Intl

Fri 7/31

8:10 am-2:55 pm

1 stop5h 45m

$455

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?

The cheapest month to fly to Illinois from Ottawa is in August. Flight prices, which tend to average around $131, are often lower during this time because this is during the off-season. If you aren’t able to travel to Illinois during the month of August, then flying in June is also cheap. Prices for this month can be found on momondo for an average of $197.

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

The cheapest day to depart from Ottawa to Illinois is on a Saturday when prices can be found for as low as $540. Flights from Ottawa to Illinois on a Monday will generally be more expensive and average around $730. Keep in mind that these prices on both days could fluctuate depending on the season and the demand.

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 $519. Flights in the morning are often more expensive with an average ticket price of $626.

What is the cheapest Ottawa to Illinois flight route?

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

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

$319

Fastest flight time

2h 08m

Direct flights

Every day

Airports in Illinois

98 airports
The best one-way flight to Illinois from Ottawa in the past 72 hours is $319. The best round-trip flight deal from Ottawa to Illinois found on momondo in the last 72 hours is $437.
The fastest flight from Ottawa to Illinois takes 2h 08m
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 required for your trip to Illinois 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 Illinois. 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 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
United AirlinesPriceFrom $324Free CancellationRating
7.4
9,717 reviews
Search United Airlines flights

Why use momondo?

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

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 Ottawa to Illinois for you.

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

Yes. momondo allows you to filter the results for Ottawa to Illinois flights to just show those with flexible booking policies.

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

momondo provides multiple filters to help you find the best flight to Illinois from Ottawa. Filter by price, airline, airports, cabin, aircraft, payment method, number of stops and more.

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

Yes momondo offers price alerts on flights to Illinois from Ottawa. After performing a search on this page you should be able to see the price alert set up feature. Simply provide a valid email address and momondo will instantly alert you when prices change.

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Find better results for your trip to Illinois

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