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Illinois

$186+ Cheap flights from Ottawa (YOW) to Illinois

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 4/22. Fares are subject to change and may not be available on all flights or dates of travel.
YOW — ORD
Apr 9 — Apr 161
Thu 4/9
Thu 4/16
1 adult, Economy
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Cheap flight deals from Ottawa to Illinois

Cheapest flights from Ottawa to Illinois
Explore the most affordable flight options available from Ottawa to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on March 10, 2026.

This United Airlines deal was found by Cheapflights users on 3/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/310:44 am
YOW
-
STL
1 stop11h 32m
United Airlines
Sat 6/66:00 am
STL
-
YOW
1 stop14h 35m
United Airlines
Deal found 3/5$310
This United Airlines deal was found by Cheapflights users on 3/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/165:25 pm
YOW
-
STL
1 stop6h 46m
United Airlines
Wed 4/2211:15 am
STL
-
YOW
1 stop4h 52m
United Airlines
Deal found 3/8$326
This United Airlines deal was found by Cheapflights users on 3/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/1610:44 am
YOW
-
STL
1 stop11h 29m
United Airlines
Tue 4/219:10 am
STL
-
YOW
2 stops11h 55m
United Airlines
Deal found 3/10$337
This United Airlines deal was found by Cheapflights users on 3/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/75:50 pm
YOW
-
STL
1 stop7h 07m
United Airlines
Tue 4/1411:15 am
STL
-
YOW
2 stops9h 50m
United Airlines
Deal found 3/9$338
This Kiwi.com deal was found by Cheapflights users on 3/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/73:55 pm
YOW
-
ORD
1 stop9h 27m
Multiple Airlines
Thu 4/912:00 pm
ORD
-
YOW
1 stop11h 25m
Multiple Airlines
Deal found 3/8$347
This Trip.com deal was found by Cheapflights users on 3/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/48:40 am
YOW
-
MDW
1 stop4h 30m
Porter Airlines
Mon 4/611:00 am
MDW
-
YOW
1 stop6h 24m
Porter Airlines
Deal found 3/5$355
This Kiwi.com deal was found by Cheapflights users on 3/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/711:00 am
YOW
-
ORD
2 stops14h 22m
Multiple Airlines
Tue 4/146:01 pm
ORD
-
YOW
1 stop22h 24m
Multiple Airlines
Deal found 3/9$361
This Kiwi.com deal was found by Cheapflights users on 3/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/187:00 am
YOW
-
ORD
1 stop15h 17m
Multiple Airlines
Wed 4/221:27 pm
ORD
-
YOW
1 stop26h 58m
Multiple Airlines
Deal found 3/7$362
This Kiwi.com deal was found by Cheapflights users on 3/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/207:00 am
YOW
-
ORD
1 stop27h 36m
Multiple Airlines
Fri 4/241:43 pm
ORD
-
YOW
1 stop9h 42m
Multiple Airlines
Deal found 3/7$363
This Air Canada deal was found by Cheapflights users on 3/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/39:55 am
YOW
-
STL
2 stops6h 51m
Air Canada
Sat 6/61:13 pm
STL
-
YOW
1 stop7h 22m
Air Canada
Deal found 3/5$364
This Kiwi.com deal was found by Cheapflights users on 3/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/234:15 pm
YOW
-
ORD
1 stop19h 21m
Multiple Airlines
Thu 3/266:01 pm
ORD
-
YOW
1 stop22h 24m
Multiple Airlines
Deal found 3/6$369
This United Airlines deal was found by Cheapflights users on 3/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/65:50 pm
YOW
-
STL
1 stop6h 55m
United Airlines
Thu 8/136:00 am
STL
-
YOW
1 stop6h 59m
United Airlines
Deal found 3/8$375

Find flight deals from Ottawa to Illinois

Keep the following information in mind while searching for Ottawa to Illinois flight deals. Data was last updated March 10, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$237
(Kiwi.com)

One-way from

$186
(Kiwi.com)

Popular in

January

Cheapest in

February

Average price

$429

Good round-trip deal

$389 or less

Good one-way deal

$225 or less
Provider with most accurate pricing for Ottawa-Chicago (CHI) flight deals.
Search Deals
Provider most trusted by Cheapflights users for Ottawa-Chicago (CHI) flights.
Search Deals
From Ottawa to Illinois
Search Deals
One-way flight from Ottawa to Illinois
Search Deals
Highest demand for flights based on searches. 16% potential increase in price ($88 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 8% potential price decrease ($33 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in March 2026
Search Deals
Price to beat on a round-trip flight from Ottawa to Illinois.
Search Deals
Price to beat on a one-way flight from Ottawa to Illinois.
Search Deals

Cheapflights 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, Cheapflights users made 2,558,603 searches. Data last updated March 10, 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

Wed 6/3

10:44 am-9:16 pm

1 stop11h 32m

Lambert-St Louis

Sat 6/6

6:00 am-9:35 pm

1 stop14h 35m

$310

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

Fri 4/17

5:25 pm-9:13 pm

1 stop4h 48m

Lambert-St Louis

Mon 4/20

9:10 am-9:35 pm

1 stop11h 25m

$326

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

Fri 4/17

5:25 pm-9:52 pm

1 stop5h 27m

Lambert-St Louis

Sun 4/19

9:10 am-5:07 pm

1 stop6h 57m

$326

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

Thu 4/16

5:25 pm-9:52 pm

1 stop5h 27m

Lambert-St Louis

Tue 4/21

6:30 am-1:59 pm

1 stop6h 29m

$337

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

Tue 4/7

5:25 pm-9:13 pm

1 stop4h 48m

Lambert-St Louis

Tue 4/14

11:15 am-5:07 pm

1 stop4h 52m

$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

$364

OttawaChicago

YOW - MDW

YOWMDW

Ottawa

Mon 4/6

5:40 am-3:20 pm

1 stop10h 40m

Chicago Midway

Mon 4/13

11:00 am-12:39 am

1 stop12h 39m

$402

OttawaChicago

YOW - MDW

YOWMDW

Ottawa

Sat 4/18

8:40 am-12:10 pm

1 stop4h 30m

Chicago Midway

Wed 4/22

7:30 am-5:29 pm

2 stops8h 59m

$431

OttawaChicago

YOW - MDW

YOWMDW

Ottawa

Thu 4/16

6:50 am-10:15 am

1 stop4h 25m

Chicago Midway

Thu 4/23

11:00 am-5:04 pm

1 stop5h 04m

$438

OttawaChicago

YOW - MDW

YOWMDW

Ottawa

Tue 4/7

7:00 am-10:15 am

1 stop4h 15m

Chicago Midway

Thu 4/9

11:00 am-5:04 pm

1 stop5h 04m

$465

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/8

Showing 1-10 of 56 resultsSorted by cheapest first
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6

Best time to book a flight from Ottawa to Illinois

Have a flexible travel schedule? Discover the best time to fly to Illinois from Ottawa with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Ottawa to Illinois

What is the cheapest month to book a flight from Ottawa to Illinois?

Currently, February is the cheapest month in which you can book a flight from Ottawa to Illinois (average of $131). Flying from Ottawa to Illinois in March is currently the most expensive (average of $231). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from YOW to IL?

Find hourly flight availability from Ottawa to Illinois. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated March 10, 2026.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Ottawa to Illinois as you normally would.

Weekly flight availability from Ottawa to Illinois

Explore weekly flight availability from Ottawa to Illinois. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated March 10, 2026.

The most flights from YOW to USIL are scheduled on a Monday (12 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (11 on average).

How much does it cost to fly round-trip from Ottawa to Illinois?

Reviews of airlines servicing Illinois

Get insights into the airlines that provide service to Illinois. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Illinois. Reviews last updated March 10, 2026.
See what other customers who have flown with Porter Airlines and United Airlines from Ottawa to Illinois have to say. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Porter Airlines
8.0
Very good
423 reviews

Overall

8.0

Crew

8.6

Comfort

8.0

Food

7.6

Boarding

8.2

Entertainment

7.0

Reviews

1 / 20
10.0
Excellent

John,Mar 2026

YYZ - PVR

I'm 6ft 4in. The seats don't have enough room. But was a good flight.
Porter Airlines
8.0
Very good
423 reviews
Porter Airlines
8.0
Very good
423 reviews

Overall

8.0

Crew

8.6

Comfort

8.0

Food

7.6

Boarding

8.2

Entertainment

7.0

Reviews

1 / 20
10.0
Excellent

John,Mar 2026

YYZ - PVR

I'm 6ft 4in. The seats don't have enough room. But was a good flight.
United Airlines
7.4
Good
9,409 reviews
Porter Airlines
8.0
Very good
423 reviews

Overall

8.0

Crew

8.6

Comfort

8.0

Food

7.6

Boarding

8.2

Entertainment

7.0

Reviews

1 / 20
10.0
Excellent

John,Mar 2026

YYZ - PVR

I'm 6ft 4in. The seats don't have enough room. But was a good flight.

Related info for your journey

Find useful and relevant information for your journey from Ottawa to Illinois. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly from for flights from Ottawa to Illinois?

    Located just 6.6 mi from the city center, Ottawa (YOW) is the airport most travelers will use when flying to Illinois from Ottawa.

  • How long is the flight from Ottawa to Illinois?

    A quick flight from Ottawa to Illinois can take about 4h 25m. United Airlines provides one of the quickest options available for as low as $438. The distance from Ottawa to Illinois is about 651 mi. Both multi-stop and nonstop flights can be found to your destination and back.

  • What are the cheapest airlines to fly from Ottawa to Illinois one-way?

    To fly one-way, consider booking your trip with Porter Airlines, which is currently one of the cheapest options available, starting at $130. United Airlines flights start at $193 while deals on Air Canada start at $461 one-way.

  • What are the most popular routes from Ottawa to Illinois?

    When deciding which route to take from Ottawa to Illinois consider Ottawa - Chicago O'Hare Intl, Ottawa - Chicago Midway or Ottawa - Lambert-St Louis as they are the most popular.

  • What are the most reliable airlines from Ottawa to Illinois?

    The top 3 most reliable airlines when flying from Ottawa to Illinois are ANA (76%), Republic Airways (76%) and Air Canada (73%).

  • What are the cheapest flights from Ottawa to Illinois?

    While on average a flight from Ottawa to Illinois is generally $735, our data shows the cheapest flight currently is $158. When looking at the most popular route, (Ottawa - Chicago O'Hare Intl), you can expect to pay $373 for that flight.

  • Can I find deals for flights from Ottawa to Illinois that include hotel bookings?

    Yes. In addition to deals on Ottawa to Illinois flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Ottawa to Illinois?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Ottawa to Illinois.

  • Can I find deals for business class flights from Ottawa to Illinois?

    Yes. Cheapflights offers flight deals from Ottawa to Illinois by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Ottawa to Illinois?

    Currently, February is the cheapest month in which you can book a flight from Ottawa to Illinois (average of $131). Flying from Ottawa to Illinois in March is currently the most expensive (average of $231). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

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Top airline flying from Ottawa to Illinois

Discover the top airline that operate flights from Ottawa to Illinois. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated March 10, 2026.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$324Average$580FlexibilityNo cancel feeOn-time69%

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