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Cheap flights from Ottawa to Illinois from $184

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 5/9. 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
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
5:25 pm - 9:13 pm
YOW
-
STL
4h 48m
1 stop
United Airlines Logo
7:45 am - 9:35 pm
STL
-
YOW
12h 50m
1 stop
$289United Airlines
Fri, May 1 - Tue, May 5
United Airlines Logo
6:25 am - 12:11 pm
YOW
-
STL
6h 46m
1 stop
United Airlines Logo
6:00 am - 5:07 pm
STL
-
YOW
10h 07m
1 stop
$306United Airlines
Thu, Jun 4 - Sun, Jun 7
United Airlines Logo
5:25 pm - 9:13 pm
YOW
-
STL
4h 48m
1 stop
United Airlines Logo
6:30 am - 5:07 pm
STL
-
YOW
9h 37m
1 stop
$307United Airlines
Fri, May 1 - Tue, May 5
United Airlines Logo
5:25 pm - 10:50 pm
YOW
-
STL
6h 25m
1 stop
United Airlines Logo
6:30 am - 9:35 pm
STL
-
YOW
14h 05m
1 stop
$308United Airlines
Fri, May 1 - Tue, May 5
Multiple Airlines Logo
3:55 pm - 1:00 pm
YOW
-
MDW
22h 05m
1 stop
Multiple Airlines Logo
7:30 am - 5:25 pm
MDW
-
YOW
8h 55m
1 stop
$320Multiple Airlines
Wed, Apr 22 - Wed, Apr 29
Air Canada Logo
3:00 pm - 8:25 pm
YOW
-
STL
6h 25m
1 stop
Air Canada Logo
7:05 am - 1:05 pm
STL
-
YOW
5h 00m
1 stop
$327Air Canada
Sun, May 10 - Sun, May 17
Multiple Airlines Logo
3:30 pm - 9:45 am
YOW
-
MDW
19h 15m
1 stop
Multiple Airlines Logo
7:30 am - 5:35 pm
MDW
-
YOW
9h 05m
1 stop
$338Multiple Airlines
Sat, May 2 - Mon, May 4
Air Canada Logo
9:55 am - 3:46 pm
YOW
-
STL
6h 51m
2 stops
Air Canada Logo
1:13 pm - 9:35 pm
STL
-
YOW
7h 22m
1 stop
$342Air Canada
Wed, Jun 3 - Sat, Jun 6
Delta Logo
12:25 pm - 11:13 pm
YOW
-
STL
11h 48m
2 stops
Delta Logo
6:48 am - 5:35 pm
STL
-
YOW
9h 47m
2 stops
$358Delta
Fri, May 1 - Tue, May 5
American Airlines Logo
7:00 am - 12:43 pm
YOW
-
ORD
6h 43m
1 stop
American Airlines Logo
8:06 am - 2:55 pm
ORD
-
YOW
5h 49m
1 stop
$386American Airlines
Fri, May 8 - Sun, May 10

American Airlines flights from Ottawa to Illinois

Our best American Airlines deals on Ottawa to Illinois flight tickets
American Airlines
May 8
YOW7:00 amOttawa
6h 43m
1 stop
ORD12:43 pmChicago O'Hare Intl
May 10
ORD8:06 amChicago O'Hare Intl
5h 49m
1 stop
YOW2:55 pmOttawa
$386
American Airlines
May 13
YOW8:40 amOttawa
6h 40m
1 stop
ORD2:20 pmChicago O'Hare Intl
May 17
ORD8:06 amChicago O'Hare Intl
5h 49m
1 stop
YOW2:55 pmOttawa
$387
American Airlines
Apr 24
YOW6:45 amOttawa
6h 58m
1 stop
ORD12:43 pmChicago O'Hare Intl
Apr 26
ORD9:50 amChicago O'Hare Intl
6h 01m
1 stop
YOW4:51 pmOttawa
$453

Porter Airlines flights from Ottawa to Illinois

Our best Porter Airlines deals on Ottawa to Illinois flight tickets
Porter Airlines
May 1
YOW11:00 amOttawa
4h 35m
1 stop
MDW2:35 pmChicago Midway
May 5
MDW10:30 amChicago Midway
6h 24m
1 stop
YOW5:54 pmOttawa
$401
Porter Airlines
Apr 30
YOW6:50 amOttawa
4h 25m
1 stop
MDW10:15 amChicago Midway
May 3
MDW3:20 pmChicago Midway
3h 44m
1 stop
YOW8:04 pmOttawa
$443
Porter Airlines
May 14
YOW11:00 amOttawa
4h 35m
1 stop
MDW2:35 pmChicago Midway
May 21
MDW3:20 pmChicago Midway
5h 24m
1 stop
YOW9:44 pmOttawa
$446

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 March 29, 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 5/1

5:25 pm-9:13 pm

1 stop4h 48m

Lambert-St Louis

Tue 5/5

7:45 am-9:35 pm

1 stop12h 50m

$289

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

Thu 6/4

6:25 am-12:11 pm

1 stop6h 46m

Lambert-St Louis

Sun 6/7

6:00 am-5:07 pm

1 stop10h 07m

$306

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

Fri 5/1

5:25 pm-9:13 pm

1 stop4h 48m

Lambert-St Louis

Tue 5/5

6:30 am-5:07 pm

1 stop9h 37m

$307

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

Fri 5/1

5:25 pm-10:50 pm

1 stop6h 25m

Lambert-St Louis

Tue 5/5

6:30 am-9:35 pm

1 stop14h 05m

$308

OttawaChicago

YOW - MDW

YOWMDW

Ottawa

Wed 4/22

3:55 pm-1:00 pm

1 stop22h 05m

Chicago Midway

Wed 4/29

7:30 am-5:25 pm

1 stop8h 55m

$320
Quickest round-trip

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

Sun 5/10

3:00 pm-8:25 pm

1 stop6h 25m

Lambert-St Louis

Sun 5/17

7:05 am-1:05 pm

1 stop5h 00m

$327

OttawaChicago

YOW - MDW

YOWMDW

Ottawa

Sat 5/2

3:30 pm-9:45 am

1 stop19h 15m

Chicago Midway

Mon 5/4

7:30 am-5:35 pm

1 stop9h 05m

$338

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

Wed 6/3

9:55 am-3:46 pm

2 stops6h 51m

Lambert-St Louis

Sat 6/6

1:13 pm-9:35 pm

1 stop7h 22m

$342

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

Fri 5/1

12:25 pm-11:13 pm

2 stops11h 48m

Lambert-St Louis

Tue 5/5

6:48 am-5:35 pm

2 stops9h 47m

$358

OttawaChicago

YOW - ORD

YOWORD

Ottawa

Fri 5/8

7:00 am-12:43 pm

1 stop6h 43m

Chicago O'Hare Intl

Sun 5/10

8:06 am-2:55 pm

1 stop5h 49m

$386

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 February. Flight prices, which tend to average around $253, 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 February, then flying in May is also cheap. Prices for this month can be found on momondo for an average of $283.

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 $539. Flights from Ottawa to Illinois on a Monday will generally be more expensive and average around $694. 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 $520. Flights in the morning are often more expensive with an average ticket price of $636.

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 12% 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

$203

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 $203. The best round-trip flight deal from Ottawa to Illinois found on momondo in the last 72 hours is $426.
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 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
9,514 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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