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$152+ 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 1/7. Fares are subject to change and may not be available on all flights or dates of travel.
YOW — ORD
Dec 21 — Dec 281
Sun 12/21
Sun 12/28
1 adult, Economy
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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 November 21, 2025.

This Kiwi.com deal was found by Cheapflights users on 11/18. 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 12/87:00 amYOW - ORD
1 stop29h 08mMultiple Airlines
Wed 12/105:00 amORD - YOW
1 stop11h 25mMultiple Airlines
Deal found 11/18$283
This Kiwi.com deal was found by Cheapflights users on 11/18. 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 12/87:00 amYOW - ORD
1 stop29h 08mMultiple Airlines
Thu 12/116:15 amORD - YOW
1 stop10h 10mMultiple Airlines
Deal found 11/18$289
This Kiwi.com deal was found by Cheapflights users on 11/18. 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 12/84:15 pmYOW - ORD
1 stop8h 54mMultiple Airlines
Tue 12/97:10 amORD - YOW
1 stop9h 15mMultiple Airlines
Deal found 11/18$325
This Kiwi.com deal was found by Cheapflights users on 11/20. 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 12/139:35 amYOW - ORD
2 stops15h 34mMultiple Airlines
Mon 12/153:26 pmORD - YOW
1 stop24h 59mMultiple Airlines
Deal found 11/20$326
This Kiwi.com deal was found by Cheapflights users on 11/20. 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 12/129:30 amYOW - MDW
1 stop14h 09mMultiple Airlines
Mon 12/153:10 pmMDW - YOW
1 stop25h 03mMultiple Airlines
Deal found 11/20$334
This Kiwi.com deal was found by Cheapflights users on 11/18. 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 12/74:15 pmYOW - ORD
2 stops22h 48mMultiple Airlines
Tue 12/97:10 amORD - YOW
1 stop9h 15mMultiple Airlines
Deal found 11/18$334
This Kiwi.com deal was found by Cheapflights users on 11/18. 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.
Thu 12/49:30 amYOW - MDW
1 stop13h 28mMultiple Airlines
Tue 12/97:44 amMDW - YOW
1 stop8h 41mMultiple Airlines
Deal found 11/18$336
This Kiwi.com deal was found by Cheapflights users on 11/20. 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 12/54:20 pmYOW - ORD
1 stop23h 01mMultiple Airlines
Mon 12/87:20 amORD - YOW
1 stop8h 53mMultiple Airlines
Deal found 11/20$336
This Mytrip deal was found by Cheapflights users on 11/19. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/49:30 amYOW - ORD
3 stops26h 38mMultiple Airlines
Mon 12/85:00 amORD - YOW
1 stop18h 25mMultiple Airlines
Deal found 11/19$340
This Kiwi.com deal was found by Cheapflights users on 11/18. 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.
Thu 12/49:30 amYOW - MDW
1 stop13h 28mMultiple Airlines
Sun 12/76:37 pmMDW - YOW
1 stop21h 36mMultiple Airlines
Deal found 11/18$343
This Kiwi.com deal was found by Cheapflights users on 11/18. 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 12/55:40 amYOW - MDW
1 stop10h 40mMultiple Airlines
Tue 12/97:44 amMDW - YOW
1 stop8h 41mMultiple Airlines
Deal found 11/18$352
This FlightHub deal was found by Cheapflights users on 11/18. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/2512:10 pmYOW - MDW
1 stop4h 10mPorter Airlines
Sun 12/284:15 pmMDW - YOW
1 stop5h 14mPorter Airlines
Deal found 11/18$367

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 November 21, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$269
(Mytrip)

One-way from

$152
(Kiwi.com)

Popular in

November

Cheapest in

May

Average price

$517

Good round-trip deal

$407 or less

Good one-way deal

$240 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. 11% potential increase in price ($51 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($10 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in November 2025
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 November 21, 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

Fri 5/8

2:25 pm-6:25 pm

1 stop5h 00m

Lambert-St Louis

Sun 5/10

1:30 pm-8:15 pm

1 stop5h 45m

$295

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

Wed 4/29

10:15 am-3:24 pm

1 stop6h 09m

Lambert-St Louis

Wed 7/29

9:10 am-3:05 pm

1 stop4h 55m

$296

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

Tue 4/7

5:25 pm-9:03 pm

1 stop4h 38m

Lambert-St Louis

Wed 4/8

7:45 am-1:45 pm

1 stop5h 00m

$300

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

Mon 1/19

5:55 pm-11:59 pm

1 stop7h 04m

Lambert-St Louis

Sat 1/24

7:00 am-1:32 pm

1 stop5h 32m

$300

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

Sun 2/8

5:55 pm-11:59 pm

1 stop7h 04m

Lambert-St Louis

Tue 2/17

7:41 am-6:55 pm

2 stops10h 14m

$300

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

Sat 2/7

6:20 am-12:29 pm

1 stop7h 09m

Lambert-St Louis

Tue 2/17

7:41 am-6:55 pm

2 stops10h 14m

$300

OttawaChicago

YOW - ORD

YOWORD

Ottawa

Thu 1/8

7:00 am-7:17 pm

1 stop13h 17m

Chicago O'Hare Intl

Mon 1/12

12:44 pm-5:13 pm

1 stop27h 29m

$309

OttawaChicago

YOW - ORD

YOWORD

Ottawa

Fri 4/10

4:20 pm-5:18 pm

3 stops25h 58m

Chicago O'Hare Intl

Mon 4/13

7:05 am-5:25 pm

1 stop9h 20m

$322

OttawaChicago

YOW - ORD

YOWORD

Ottawa

Wed 1/21

4:15 pm-11:22 am

1 stop20h 07m

Chicago O'Hare Intl

Sun 1/25

3:05 pm-4:53 pm

2 stops24h 48m

$323

OttawaChicago

YOW - ORD

YOWORD

Ottawa

Mon 12/8

4:15 pm-1:58 pm

2 stops22h 43m

Chicago O'Hare Intl

Wed 12/10

5:00 am-5:25 pm

1 stop11h 25m

$340

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/20

Showing 1-10 of 45 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 March is currently the most expensive (average of $256). 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 November 21, 2025.

It’s typically best to fly out from Ottawa to Illinois at noon. Doing so could potentially save you 43% 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 November 21, 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).

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 November 21, 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
8.0
Very good
393 reviews

Food

7.6

Comfort

8.0

Entertainment

7.0

Boarding

8.2

Overall

8.0

Crew

8.6

Reviews

1 / 20
8.0
Excellent

Mohameed,Nov 2025

LAS - YYZ

It's good. Planes are new and fresh. WiFi is best and stands out
Porter Airlines
8.0
Very good
393 reviews
Porter Airlines
8.0
Very good
393 reviews

Food

7.6

Comfort

8.0

Entertainment

7.0

Boarding

8.2

Overall

8.0

Crew

8.6

Reviews

1 / 20
8.0
Excellent

Mohameed,Nov 2025

LAS - YYZ

It's good. Planes are new and fresh. WiFi is best and stands out
United Airlines
7.4
Good
9,029 reviews
Porter Airlines
8.0
Very good
393 reviews

Food

7.6

Comfort

8.0

Entertainment

7.0

Boarding

8.2

Overall

8.0

Crew

8.6

Reviews

1 / 20
8.0
Excellent

Mohameed,Nov 2025

LAS - YYZ

It's good. Planes are new and fresh. WiFi is best and stands out
Air Canada
7.1
Good
10,463 reviews
Porter Airlines
8.0
Very good
393 reviews

Food

7.6

Comfort

8.0

Entertainment

7.0

Boarding

8.2

Overall

8.0

Crew

8.6

Reviews

1 / 20
8.0
Excellent

Mohameed,Nov 2025

LAS - YYZ

It's good. Planes are new and fresh. WiFi is best and stands out

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 10m. Air Canada provides one of the quickest options available for as low as $367. 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 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 (90%), GoJet (88%) and Avianca (87%).

  • What are the cheapest flights from Ottawa to Illinois?

    While on average a flight from Ottawa to Illinois is generally $682, our data shows the cheapest flight currently is $187. When looking at the most popular route, (Ottawa - Chicago O'Hare Intl), you can expect to pay $301 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 March is currently the most expensive (average of $256). 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.

See more FAQs

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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 November 21, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$324Average$519FlexibilityNo cancel feeOn-time69%
Air CanadaCheapest$326Average$544FlexibilityNo cancel feeOn-time67%

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