HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Illinois

$157+ 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 7/21. Fares are subject to change and may not be available on all flights or dates of travel.
YOW — ORD
Jun 17 — Jun 241
Tue 6/17
Tue 6/24
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Ottawa to Illinois with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

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 June 12, 2025.

Round-trip from

$261
(FlightHub)

One-way from

$157
(FlightHub)

Popular in

November

Cheapest in

May

Average price

$451

Good round-trip deal

$351 or less

Good one-way deal

$232 or less
From Ottawa to Illinois
Search Deals
One-way flight from Ottawa to Illinois
Search Deals
Highest demand for flights based on searches. 5% potential increase in price ($23 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 0% potential price decrease ($5 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in June 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

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 June 12, 2025.

This FlightHub deal was found by Cheapflights users on 6/10. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/308:35 amYOW - MDW
1 stop8h 49mPorter Airlines
Tue 8/59:40 amMDW - YOW
1 stop8h 13mPorter Airlines
Deal found 6/10$261
This Kiwi.com deal was found by Cheapflights users on 6/10. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/255:55 amYOW - MDW
1 stop11h 29mMultiple Airlines
Sun 7/279:40 amMDW - YOW
1 stop8h 58mMultiple Airlines
Deal found 6/10$327
This Kiwi.com deal was found by Cheapflights users on 6/10. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 6/233:50 pmYOW - ORD
1 stop18h 00mMultiple Airlines
Wed 6/255:51 amORD - YOW
1 stop8h 05mMultiple Airlines
Deal found 6/10$361
This United Airlines deal was found by Cheapflights users on 6/11. 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.
Fri 7/45:25 pmYOW - ORD
Nonstop2h 28mUnited Airlines
Sun 7/66:15 pmORD - YOW
Nonstop2h 20mUnited Airlines
Deal found 6/11$376
This Air Canada deal was found by Cheapflights users on 6/10. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/16:00 amYOW - ORD
1 stop4h 52mAir Canada
Sun 7/68:40 amORD - YOW
1 stop4h 04mAir Canada
Deal found 6/10$386
This FlightHub deal was found by Cheapflights users on 6/12. 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.
Fri 8/296:00 amYOW - ORD
1 stop11h 44mWestJet
Tue 9/25:30 pmORD - YOW
2 stops21h 49mWestJet
Deal found 6/12$473
This Delta deal was found by Cheapflights users on 6/11. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/165:55 amYOW - ORD
2 stops8h 47mDelta
Mon 8/181:30 pmORD - YOW
2 stops9h 52mDelta
Deal found 6/11$575
This United Airlines deal was found by Cheapflights users on 6/11. 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 7/95:25 pmYOW - STL
1 stop5h 10mUnited Airlines
Wed 7/165:00 amSTL - YOW
1 stop15h 35mUnited Airlines
Deal found 6/11$584
This Air Canada deal was found by Cheapflights users on 6/11. 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.
Fri 8/110:00 amYOW - STL
1 stop6h 21mAir Canada
Tue 8/51:30 pmSTL - YOW
1 stop4h 35mAir Canada
Deal found 6/11$585
This FlightHub deal was found by Cheapflights users on 6/11. 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.
Fri 6/275:55 amYOW - MDW
2 stops16h 50mWestJet
Tue 7/112:44 pmMDW - YOW
2 stops10h 38mWestJet
Deal found 6/11$595
This Delta deal was found by Cheapflights users on 6/10. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/85:55 amYOW - MDW
2 stops12h 44mDelta
Tue 7/159:25 amMDW - YOW
2 stops13h 57mDelta
Deal found 6/10$604
This Mytrip deal was found by Cheapflights users on 6/11. 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.
Tue 6/174:10 pmYOW - STL
3 stops25h 35mMultiple Airlines
Thu 6/199:50 amSTL - YOW
3 stops13h 32mMultiple Airlines
Deal found 6/11$751

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 June 12, 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

OttawaChicago

YOW - MDW

YOWMDW

Ottawa

Wed 7/30

8:35 am-4:24 pm

1 stop8h 49m

Chicago Midway

Tue 8/5

9:40 am-6:53 pm

1 stop8h 13m

$261

OttawaChicago

YOW - MDW

YOWMDW

Ottawa

Fri 7/25

5:55 am-4:24 pm

1 stop11h 29m

Chicago Midway

Sun 7/27

9:40 am-7:38 pm

1 stop8h 58m

$327

OttawaChicago

YOW - ORD

YOWORD

Ottawa

Mon 6/23

3:50 pm-8:50 am

1 stop18h 00m

Chicago O'Hare Intl

Wed 6/25

5:51 am-2:56 pm

1 stop8h 05m

$361

OttawaChicago

YOW - ORD

YOWORD

Ottawa

Fri 7/4

5:25 pm-6:53 pm

Nonstop2h 28m

Chicago O'Hare Intl

Sun 7/6

6:15 pm-9:35 pm

Nonstop2h 20m

$376

OttawaChicago

YOW - ORD

YOWORD

Ottawa

Tue 7/1

6:00 am-9:52 am

1 stop4h 52m

Chicago O'Hare Intl

Sun 7/6

8:40 am-1:44 pm

1 stop4h 04m

$386

OttawaChicago

YOW - ORD

YOWORD

Ottawa

Fri 8/29

6:00 am-4:44 pm

1 stop11h 44m

Chicago O'Hare Intl

Tue 9/2

5:30 pm-4:19 pm

2 stops21h 49m

$473

OttawaChicago

YOW - ORD

YOWORD

Ottawa

Sat 8/16

5:55 am-1:42 pm

2 stops8h 47m

Chicago O'Hare Intl

Mon 8/18

1:30 pm-12:22 am

2 stops9h 52m

$575

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

Wed 7/9

5:25 pm-9:35 pm

1 stop5h 10m

Lambert-St Louis

Wed 7/16

5:00 am-9:35 pm

1 stop15h 35m

$584

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

Fri 8/1

10:00 am-3:21 pm

1 stop6h 21m

Lambert-St Louis

Tue 8/5

1:30 pm-7:05 pm

1 stop4h 35m

$585

OttawaChicago

YOW - MDW

YOWMDW

Ottawa

Fri 6/27

5:55 am-9:45 pm

2 stops16h 50m

Chicago Midway

Tue 7/1

12:44 pm-12:22 am

2 stops10h 38m

$595

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/11

Showing 1-10 of 20 results
1
2

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, August is the cheapest month in which you can book a flight from Ottawa to Illinois (average of $245). Flying from Ottawa to Illinois in March is currently the most expensive (average of $321). 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 June 12, 2025.

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 June 12, 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).

Rainfall in Illinois by month

Plan your trip to Illinois by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Illinois ranges from 1.7 - 4.9 inches per month. August is typically the wettest month, when rainfall can reach 4.9 in. January is typically the driest time to visit Illinois when rainfall is around 1.7 in.

Temperature in Illinois by month

Plan your trip to Illinois by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Illinois, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 73.4 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 23.0 F).

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 June 12, 2025.
Read through reviews of airlines operating flights from Ottawa to Illinois, such as Porter Airlines, Delta and United Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Porter Airlines
8.0
Very good
288 reviews

Food

7.6

Boarding

8.2

Crew

8.7

Entertainment

7.0

Comfort

8.1

Overall

8.0

Reviews

1 / 20
4.0
Okay

Mary,Jun 2025

FLL - YYZ

Fort Lauderdale staff was not helpful at all to try to accommodate my husband and myself to sit together. Also very surprised to get charged USD53 for each of our checked luggage, as when we booked the tickets online, the website indicated that our first checked luggage will be charged CAD50!! Very misleading!!!
Porter Airlines
8.0
Very good
288 reviews
Porter Airlines
8.0
Very good
288 reviews

Food

7.6

Boarding

8.2

Crew

8.7

Entertainment

7.0

Comfort

8.1

Overall

8.0

Reviews

1 / 20
4.0
Okay

Mary,Jun 2025

FLL - YYZ

Fort Lauderdale staff was not helpful at all to try to accommodate my husband and myself to sit together. Also very surprised to get charged USD53 for each of our checked luggage, as when we booked the tickets online, the website indicated that our first checked luggage will be charged CAD50!! Very misleading!!!
Delta
8.0
Very good
7,950 reviews
Porter Airlines
8.0
Very good
288 reviews

Food

7.6

Boarding

8.2

Crew

8.7

Entertainment

7.0

Comfort

8.1

Overall

8.0

Reviews

1 / 20
4.0
Okay

Mary,Jun 2025

FLL - YYZ

Fort Lauderdale staff was not helpful at all to try to accommodate my husband and myself to sit together. Also very surprised to get charged USD53 for each of our checked luggage, as when we booked the tickets online, the website indicated that our first checked luggage will be charged CAD50!! Very misleading!!!
United Airlines
7.4
Good
8,790 reviews
Porter Airlines
8.0
Very good
288 reviews

Food

7.6

Boarding

8.2

Crew

8.7

Entertainment

7.0

Comfort

8.1

Overall

8.0

Reviews

1 / 20
4.0
Okay

Mary,Jun 2025

FLL - YYZ

Fort Lauderdale staff was not helpful at all to try to accommodate my husband and myself to sit together. Also very surprised to get charged USD53 for each of our checked luggage, as when we booked the tickets online, the website indicated that our first checked luggage will be charged CAD50!! Very misleading!!!
WestJet
7.2
Good
2,868 reviews
Porter Airlines
8.0
Very good
288 reviews

Food

7.6

Boarding

8.2

Crew

8.7

Entertainment

7.0

Comfort

8.1

Overall

8.0

Reviews

1 / 20
4.0
Okay

Mary,Jun 2025

FLL - YYZ

Fort Lauderdale staff was not helpful at all to try to accommodate my husband and myself to sit together. Also very surprised to get charged USD53 for each of our checked luggage, as when we booked the tickets online, the website indicated that our first checked luggage will be charged CAD50!! Very misleading!!!
Air Canada
7.1
Good
9,531 reviews
Porter Airlines
8.0
Very good
288 reviews

Food

7.6

Boarding

8.2

Crew

8.7

Entertainment

7.0

Comfort

8.1

Overall

8.0

Reviews

1 / 20
4.0
Okay

Mary,Jun 2025

FLL - YYZ

Fort Lauderdale staff was not helpful at all to try to accommodate my husband and myself to sit together. Also very surprised to get charged USD53 for each of our checked luggage, as when we booked the tickets online, the website indicated that our first checked luggage will be charged CAD50!! Very misleading!!!

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.

  • 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 $157. WestJet flights start at $207 while deals on United Airlines start at $213 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 Avianca (89%), ANA (85%) and GoJet (82%).

  • What are the cheapest flights from Ottawa to Illinois?

    While on average a flight from Ottawa to Illinois is generally $499, our data shows the cheapest flight currently is $155. When looking at the most popular route, (Ottawa - Chicago O'Hare Intl), you can expect to pay $361 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, August is the cheapest month in which you can book a flight from Ottawa to Illinois (average of $245). Flying from Ottawa to Illinois in March is currently the most expensive (average of $321). 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

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Ottawa to Illinois

See prices for flight routes from nearby airports that may be better suited for you.
Pearson Intl to Newark flights
Pearson Intl to John F Kennedy Intl flights
Toronto Island to Newark flights
Pearson Intl to LaGuardia flights
Pierre Elliott Trudeau Intl to Fort Lauderdale flights
Pearson Intl to Fort Lauderdale flights
Pearson Intl to Los Angeles flights
Pearson Intl to Las Vegas flights
Pierre Elliott Trudeau Intl to LaGuardia flights
Pierre Elliott Trudeau Intl to Newark flights
Pearson Intl to Orlando flights
Pearson Intl to Miami flights
Pierre Elliott Trudeau Intl to John F Kennedy Intl flights
Pearson Intl to San Francisco flights
Pearson Intl to Seattle flights
Pierre Elliott Trudeau Intl to Miami flights
Pearson Intl to Boston flights
Pearson Intl to Dallas/Fort Worth flights
Pearson Intl to O'Hare Intl flights
Pearson Intl to Hobby flights
Pierre Elliott Trudeau Intl to Los Angeles flights
Pearson Intl to Dulles Intl flights
Pearson Intl to Reagan-National flights
Pierre Elliott Trudeau Intl to Orlando flights
Pearson Intl to George Bush Intcntl flights
Toronto Island to Fort Lauderdale flights
Toronto Island to Boston flights
Pierre Elliott Trudeau Intl to Las Vegas flights
Pearson Intl to Atlanta flights
Toronto Island to Orlando flights
Toronto Island to Midway flights
Pearson Intl to Denver flights
Pierre Elliott Trudeau Intl to O'Hare Intl flights
Pierre Elliott Trudeau Intl to San Francisco flights
Pearson Intl to Midway flights
Pearson Intl to San Diego flights
Pearson Intl to Nashville flights
Pearson Intl to Tampa flights
Pierre Elliott Trudeau Intl to Dallas/Fort Worth flights
Pearson Intl to Honolulu flights
Pearson Intl to Philadelphia flights
Pierre Elliott Trudeau Intl to Nashville flights
Pearson Intl to Sky Harbor Intl flights
Pierre Elliott Trudeau Intl to Dulles Intl flights
Pierre Elliott Trudeau Intl to Seattle flights
Toronto Island to Dulles Intl flights
Pierre Elliott Trudeau Intl to Boston flights
Ottawa to Newark flights
Pierre Elliott Trudeau Intl to Honolulu flights
Pierre Elliott Trudeau Intl to Hobby flights

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 June 12, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$410Average$606FlexibilityNo cancel feeOn-time69%
Air CanadaCheapest$423Average$550FlexibilityNo cancel feeOn-time67%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.