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Illinois

$168+ 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 1/27. Fares are subject to change and may not be available on all flights or dates of travel.
YOW — ORD
Nov 5 — Nov 121
Wed 11/5
Wed 11/12
1 adult, Economy
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Cheap flight deals from Ottawa to Illinois

Keep the following information in mind while searching for Ottawa to Illinois flight deals. Data was last updated October 6, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$301
(United Airlines)

One-way from

$168
(Mytrip)

Popular in

November

Cheapest in

May

Average price

$416

Good round-trip deal

$440 or less

Good one-way deal

$228 or less
Provider with most accurate pricing for Ottawa-Chicago (CHI) flight deals.
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Provider most trusted by Cheapflights users for Ottawa-Chicago (CHI) flights.
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From Ottawa to Illinois
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One-way flight from Ottawa to Illinois
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Highest demand for flights based on searches. 9% potential increase in price ($44 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($8 potential savings vs. average RT price).
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Average for round-trip flights in October 2025
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Price to beat on a round-trip flight from Ottawa to Illinois.
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Price to beat on a one-way flight from Ottawa to Illinois.
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Find 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 October 6, 2025.

This United Airlines deal was found by Cheapflights users on 10/5. 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 12/245:59 pmYOW - STL
1 stop6h 58mUnited Airlines
Tue 1/66:30 amSTL - YOW
1 stop9h 42mUnited Airlines
Deal found 10/5$301
This United Airlines deal was found by Cheapflights users on 10/5. 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 12/246:15 amYOW - STL
1 stop7h 12mUnited Airlines
Sat 1/37:00 amSTL - YOW
1 stop5h 32mUnited Airlines
Deal found 10/5$302
This United deal was found by Cheapflights users on 10/5. 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 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/243:10 pmYOW - STL
1 stop9h 47mMultiple Airlines
Mon 1/54:05 pmSTL - YOW
1 stop6h 03mMultiple Airlines
Deal found 10/5$308
This Kiwi.com deal was found by Cheapflights users on 10/5. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/29:30 amYOW - ORD
1 stop31h 33mMultiple Airlines
Sun 12/76:05 amORD - YOW
1 stop10h 08mMultiple Airlines
Deal found 10/5$309
This Kiwi.com deal was found by Cheapflights users on 10/5. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/29:30 amYOW - ORD
1 stop31h 33mMultiple Airlines
Mon 12/86:40 amORD - YOW
1 stop28h 55mMultiple Airlines
Deal found 10/5$313
This Kiwi.com deal was found by Cheapflights users on 10/5. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/169:25 amYOW - ORD
1 stop5h 01mMultiple Airlines
Tue 11/183:26 pmORD - YOW
1 stop24h 59mMultiple Airlines
Deal found 10/5$321
This Kiwi.com deal was found by Cheapflights users on 10/5. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/29:30 amYOW - ORD
1 stop31h 33mMultiple Airlines
Sat 12/66:40 amORD - YOW
1 stop9h 45mMultiple Airlines
Deal found 10/5$324
This Kiwi.com deal was found by Cheapflights users on 10/4. 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.
Fri 11/73:55 pmYOW - ORD
1 stop22h 31mMultiple Airlines
Sun 11/95:25 amORD - YOW
1 stop10h 48mMultiple Airlines
Deal found 10/4$329
This Kiwi.com deal was found by Cheapflights users on 10/5. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/163:55 pmYOW - MDW
1 stop9h 00mMultiple Airlines
Tue 11/186:26 pmMDW - YOW
1 stop17h 09mMultiple Airlines
Deal found 10/5$332
This Kiwi.com deal was found by Cheapflights users on 10/4. 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.
Fri 10/244:25 pmYOW - ORD
1 stop26h 28mMultiple Airlines
Sun 10/267:43 pmORD - YOW
1 stop20h 42mMultiple Airlines
Deal found 10/4$338
This American Airlines deal was found by Cheapflights users on 10/4. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/306:45 amYOW - ORD
1 stop6h 55mAmerican Airlines
Mon 11/36:33 pmORD - YOW
1 stop5h 06mAmerican Airlines
Deal found 10/4$340
This American Airlines deal was found by Cheapflights users on 10/6. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/16:45 amYOW - ORD
1 stop6h 55mAmerican Airlines
Sat 11/86:33 pmORD - YOW
1 stop5h 06mAmerican Airlines
Deal found 10/6$351

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 October 6, 2025.
Use the filters below to find and compare flights from Ottawa to Illinois that are best for you.

Fly from

Ottawa

Fly to

Illinois

Route

Depart

Return

Price

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

Wed 12/24

5:59 pm-11:57 pm

1 stop6h 58m

Lambert-St Louis

Tue 1/6

6:30 am-5:12 pm

1 stop9h 42m

$301

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

Tue 12/23

6:15 am-12:27 pm

1 stop7h 12m

Lambert-St Louis

Fri 1/2

7:00 am-1:32 pm

1 stop5h 32m

$301

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

Wed 12/24

3:10 pm-11:57 pm

1 stop9h 47m

Lambert-St Louis

Mon 1/5

4:05 pm-11:08 pm

1 stop6h 03m

$308

OttawaChicago

YOW - MDW

YOWMDW

Ottawa

Sun 11/16

3:55 pm-11:55 pm

1 stop9h 00m

Chicago Midway

Tue 11/18

6:26 pm-12:35 pm

1 stop17h 09m

$332

OttawaChicago

YOW - ORD

YOWORD

Ottawa

Sat 11/1

6:45 am-12:40 pm

1 stop6h 55m

Chicago O'Hare Intl

Sat 11/8

6:33 pm-12:39 am

1 stop5h 06m

$351

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

Wed 12/24

6:15 am-12:27 pm

1 stop7h 12m

Lambert-St Louis

Sun 1/4

6:35 pm-2:30 pm

2 stops18h 55m

$354

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

Wed 12/24

6:15 am-12:27 pm

1 stop7h 12m

Lambert-St Louis

Mon 1/5

6:35 pm-2:30 pm

2 stops18h 55m

$354

OttawaChicago

YOW - ORD

YOWORD

Ottawa

Sat 11/1

3:35 pm-2:26 pm

2 stops23h 51m

Chicago O'Hare Intl

Sat 11/8

2:31 pm-12:35 pm

1 stop21h 04m

$359

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

Wed 12/24

6:00 am-2:26 pm

2 stops9h 26m

Lambert-St Louis

Sat 1/3

7:00 am-1:32 pm

1 stop5h 32m

$361

OttawaChicago

YOW - ORD

YOWORD

Ottawa

Sun 11/30

5:45 pm-1:35 pm

1 stop20h 50m

Chicago O'Hare Intl

Fri 12/5

2:20 pm-12:40 am

1 stop9h 20m

$376

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/5

Showing 1-10 of 50 results
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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, September is the cheapest month in which you can book a flight from Ottawa to Illinois (average of $131). Flying from Ottawa to Illinois in January is currently the most expensive (average of $285). 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 October 6, 2025.

It’s typically best to fly out from Ottawa to Illinois at noon. Doing so could potentially save you 44% on the flight price compared to flying in the afternoon, which is usually more expensive.

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 October 6, 2025.

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

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 October 6, 2025.
See what other customers who have flown with Porter Airlines, United Airlines, and Air Canada 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
7.9
Good
374 reviews

Entertainment

7.0

Food

7.6

Comfort

8.0

Crew

8.6

Overall

7.9

Boarding

8.2

Reviews

1 / 20
2.0
Mediocre

Anonymous,Sep 2025

YYZ - OPO

Very disappointing, booked with Porter airlines and changed to Air Transit last minute. Old plane, cramped seating, even the aisle was the narrowest I’ve ever seen. Very uncomfortable flight. Full meal at 130 am and only a small piece of banana bread in the morning… should be opposite.
Porter Airlines
7.9
Good
374 reviews
Porter Airlines
7.9
Good
374 reviews

Entertainment

7.0

Food

7.6

Comfort

8.0

Crew

8.6

Overall

7.9

Boarding

8.2

Reviews

1 / 20
2.0
Mediocre

Anonymous,Sep 2025

YYZ - OPO

Very disappointing, booked with Porter airlines and changed to Air Transit last minute. Old plane, cramped seating, even the aisle was the narrowest I’ve ever seen. Very uncomfortable flight. Full meal at 130 am and only a small piece of banana bread in the morning… should be opposite.
United Airlines
7.4
Good
8,953 reviews
Porter Airlines
7.9
Good
374 reviews

Entertainment

7.0

Food

7.6

Comfort

8.0

Crew

8.6

Overall

7.9

Boarding

8.2

Reviews

1 / 20
2.0
Mediocre

Anonymous,Sep 2025

YYZ - OPO

Very disappointing, booked with Porter airlines and changed to Air Transit last minute. Old plane, cramped seating, even the aisle was the narrowest I’ve ever seen. Very uncomfortable flight. Full meal at 130 am and only a small piece of banana bread in the morning… should be opposite.
Air Canada
7.1
Good
10,236 reviews
Porter Airlines
7.9
Good
374 reviews

Entertainment

7.0

Food

7.6

Comfort

8.0

Crew

8.6

Overall

7.9

Boarding

8.2

Reviews

1 / 20
2.0
Mediocre

Anonymous,Sep 2025

YYZ - OPO

Very disappointing, booked with Porter airlines and changed to Air Transit last minute. Old plane, cramped seating, even the aisle was the narrowest I’ve ever seen. Very uncomfortable flight. Full meal at 130 am and only a small piece of banana bread in the morning… should be opposite.

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 6h 55m. United Airlines provides one of the quickest options available for as low as $351. The distance from Ottawa to Illinois is about 653 mi. Both multi-stop and nonstop flights can be found to your destination and back.

  • 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 GoJet (92%), ANA (91%) and Avianca (90%).

  • What are the cheapest flights from Ottawa to Illinois?

    While on average a flight from Ottawa to Illinois is generally $580, our data shows the cheapest flight currently is $144. When looking at the most popular route, (Ottawa - Chicago O'Hare Intl), you can expect to pay $321 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, September is the cheapest month in which you can book a flight from Ottawa to Illinois (average of $131). Flying from Ottawa to Illinois in January is currently the most expensive (average of $285). 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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Alternative routes for Ottawa to Illinois

See prices for flight routes from nearby airports that may be better suited for you.
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Top 2 airlines flying from Ottawa to Illinois

Discover the top 2 airlines 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 October 6, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$324Average$459FlexibilityNo cancel feeOn-time69%
Air CanadaCheapest$326Average$550FlexibilityNo cancel feeOn-time67%

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