Find flights
Deals
When to book
Airlines
FAQs

Cheap flights from Ottawa to Illinois from C$ 269

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 14/9. Fares are subject to change and may not be available on all flights or dates of travel.
YOW — ORD
27 Aug — 3 Sep1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Ottawa to Illinois

Enter your travel dates to find the best prices.

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 28 July 2026.

Sat 12/96:55 a.m.
YOW
-
MDW
1 stop8h 40m
Multiple Airlines
Sat 19/93:20 p.m.
MDW
-
YOW
1 stop8h 00m
Multiple Airlines
Deal found 26/7C$ 487
Sat 12/96:55 a.m.
YOW
-
MDW
1 stop8h 40m
Multiple Airlines
Sun 13/93:20 p.m.
MDW
-
YOW
1 stop8h 00m
Multiple Airlines
Deal found 23/7C$ 495
Tue 8/96:25 p.m.
YOW
-
MDW
1 stop17h 35m
Multiple Airlines
Sun 13/93:20 p.m.
MDW
-
YOW
1 stop20h 32m
Multiple Airlines
Deal found 25/7C$ 501
Tue 8/96:55 a.m.
YOW
-
ORD
1 stop13h 53m
Multiple Airlines
Tue 15/92:15 p.m.
ORD
-
YOW
1 stop9h 05m
Multiple Airlines
Deal found 24/7C$ 512
Wed 9/96:55 a.m.
YOW
-
ORD
2 stops14h 17m
Multiple Airlines
Wed 16/93:40 p.m.
ORD
-
YOW
2 stops16h 35m
Multiple Airlines
Deal found 26/7C$ 513
Sat 5/96:55 a.m.
YOW
-
MDW
1 stop8h 40m
Multiple Airlines
Sat 19/93:20 p.m.
MDW
-
YOW
1 stop8h 00m
Multiple Airlines
Deal found 23/7C$ 526
Thu 10/96:55 a.m.
YOW
-
ORD
1 stop9h 00m
Multiple Airlines
Thu 17/911:05 a.m.
ORD
-
YOW
2 stops12h 15m
Multiple Airlines
Deal found 27/7C$ 537
Mon 7/96:55 a.m.
YOW
-
ORD
1 stop9h 00m
Multiple Airlines
Mon 14/92:15 p.m.
ORD
-
YOW
1 stop9h 05m
Multiple Airlines
Deal found 24/7C$ 547
Fri 2/107:20 a.m.
YOW
-
ORD
1 stop10h 20m
WestJet
Mon 5/105:30 p.m.
ORD
-
YOW
1 stop11h 05m
WestJet
Deal found 27/7C$ 550
Thu 27/86:55 a.m.
YOW
-
MDW
1 stop8h 40m
Multiple Airlines
Sun 30/810:20 a.m.
MDW
-
YOW
1 stop13h 00m
Multiple Airlines
Deal found 26/7C$ 587
Tue 22/910:40 a.m.
YOW
-
MDW
1 stop4h 55m
Porter Airlines
Fri 25/93:20 p.m.
MDW
-
YOW
1 stop20h 32m
Porter Airlines
Deal found 23/7C$ 588
Sun 6/98:45 p.m.
YOW
-
MDW
1 stop15h 15m
Porter Airlines
Sun 13/93:20 p.m.
MDW
-
YOW
1 stop20h 32m
Porter Airlines
Deal found 23/7C$ 602

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 28 July 2026.

Round-trip from

C$ 487

One-way from

C$ 269

Popular in

January

Cheapest in

February

Average price

C$ 863

Good round-trip deal

C$ 796 or less

Good one-way deal

C$ 373 or less
12/9-19/9
  • 12/9-19/9
  • 2 total stops
  • 16h 40m total
  • Ottawa to Illinois
Search Deals
14/9
  • 14/9
  • 1 total stop
  • 8h 40m total
  • Ottawa to Illinois
Search Deals
Highest demand for flights based on searches. 4% potential increase in price (C$ 45 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 6% potential price decrease (C$ 61 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in July 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 629,999 searches. Data last updated 28 July 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

OttawaChicago

YOW - MDW

YOWMDW

Ottawa

Fri 11/9

8:00 a.m.-11:00 a.m.

1 stop4h 00m

Chicago Midway

Sun 13/9

3:20 p.m.-12:52 p.m.

1 stop20h 32m

C$ 597

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

Fri 14/8

9:00 a.m.-2:04 p.m.

1 stop6h 04m

Lambert-St Louis

Sat 22/8

12:10 p.m.-7:45 p.m.

1 stop6h 35m

C$ 659

OttawaChicago

YOW - MDW

YOWMDW

Ottawa

Fri 9/10

6:25 p.m.-2:35 p.m.

1 stop21h 10m

Chicago Midway

Tue 13/10

3:20 p.m.-12:20 a.m.

1 stop8h 00m

C$ 687

OttawaChicago

YOW - MDW

YOWMDW

Ottawa

Tue 25/8

10:40 a.m.-2:35 p.m.

1 stop4h 55m

Chicago Midway

Sun 30/8

6:05 a.m.-2:55 p.m.

2 stops31h 50m

C$ 705

OttawaChicago

YOW - MDW

YOWMDW

Ottawa

Thu 13/8

6:55 a.m.-2:35 p.m.

1 stop8h 40m

Chicago Midway

Sat 15/8

10:20 a.m.-12:20 a.m.

1 stop13h 00m

C$ 705

OttawaChicago

YOW - MDW

YOWMDW

Ottawa

Mon 17/8

10:40 a.m.-2:35 p.m.

1 stop4h 55m

Chicago Midway

Tue 18/8

10:25 a.m.-5:54 p.m.

1 stop6h 29m

C$ 711

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

Fri 23/10

6:25 a.m.-12:13 p.m.

1 stop6h 48m

Lambert-St Louis

Mon 26/10

5:00 a.m.-3:07 p.m.

2 stops9h 07m

C$ 733

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

Tue 15/9

6:00 a.m.-2:15 p.m.

2 stops9h 15m

Lambert-St Louis

Sat 19/9

12:59 p.m.-10:35 p.m.

2 stops8h 36m

C$ 733

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

Sat 19/9

6:00 a.m.-9:39 a.m.

1 stop4h 39m

Lambert-St Louis

Wed 23/9

10:53 a.m.-5:16 p.m.

1 stop5h 23m

C$ 733

OttawaChicago

YOW - MDW

YOWMDW

Ottawa

Thu 6/8

10:40 a.m.-2:35 p.m.

1 stop4h 55m

Chicago Midway

Tue 11/8

10:25 a.m.-5:54 p.m.

1 stop6h 29m

C$ 738

Flights are sorted by cheapest round-trip flights first.

Deals found on 27/7

Showing 1-10 of 49 resultsSorted by cheapest first
1
2
3
...
5

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 C$ 532). Flying from Ottawa to Illinois in January is currently the most expensive (average of C$ 1,137). 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 28 July 2026.

When flying from Ottawa to Illinois, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

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 28 July 2026.

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?

Airfare is below average for this route at the moment.
Ottawa to Illinois flights typically cost between C$ 877 and C$ 1,148 in September.
The cheapest round-trip price found within the last 5 days was C$ 512 on Multiple Airlines (8 Sep-15 Sep).

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 28 July 2026.
Read reviews from past customers who have flown Porter Airlines,United Airlines, andAir Canada from Ottawa to Illinois. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Porter Airlines
8.0
Very good
449 reviews
Check prices

Entertainment

6.9

Overall

8.0

Crew

8.6

Comfort

8.0

Boarding

8.2

Food

7.5

Reviews

1 / 20
6.0
Good

Shannon,Jul 2026

YQT - YOW

Seats need to be a bit bigger & I'm not impressed that you have to pay to change seats
Porter Airlines
8.0
Very good
449 reviews
Porter Airlines
8.0
Very good
449 reviews
Check prices

Entertainment

6.9

Overall

8.0

Crew

8.6

Comfort

8.0

Boarding

8.2

Food

7.5

Reviews

1 / 20
6.0
Good

Shannon,Jul 2026

YQT - YOW

Seats need to be a bit bigger & I'm not impressed that you have to pay to change seats
United Airlines
7.4
Good
10,045 reviews
Porter Airlines
8.0
Very good
449 reviews
Check prices

Entertainment

6.9

Overall

8.0

Crew

8.6

Comfort

8.0

Boarding

8.2

Food

7.5

Reviews

1 / 20
6.0
Good

Shannon,Jul 2026

YQT - YOW

Seats need to be a bit bigger & I'm not impressed that you have to pay to change seats
Air Canada
7.1
Good
11,398 reviews
Porter Airlines
8.0
Very good
449 reviews
Check prices

Entertainment

6.9

Overall

8.0

Crew

8.6

Comfort

8.0

Boarding

8.2

Food

7.5

Reviews

1 / 20
6.0
Good

Shannon,Jul 2026

YQT - YOW

Seats need to be a bit bigger & I'm not impressed that you have to pay to change seats

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?

    Ottawa (YOW) is the airport you will fly out of if you book a flight from Ottawa to Illinois. It is only a 10.6 km journey to Ottawa (YOW) from Ottawa’s city centre.

  • How long is the flight from Ottawa to Illinois?

    Porter Airlines, Air Canada, and United Airlines can get you from Ottawa to Illinois in just under 4h. Your travel time can differ by up to 2h 48m. There are 1048 km between Ottawa and Illinois. When browsing for deals, the options you’ll see will be for both direct flights and flights with stops.

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

    Most travellers choose Ottawa - Chicago O'Hare Intl, Ottawa - Chicago Midway or Ottawa - Lambert-St Louis when deciding on the best route from Ottawa to Illinois.

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

    Before booking your flight to Illinois from Ottawa, check out the most reliable airlines to get you to your destination on time: Republic Airways (87%), United Airlines (86%), ANA( 86%).

  • What are the cheapest flights from Ottawa to Illinois?

    Looking for the cheapest flight from Ottawa to Illinois? While on average our users pay C$ 1,467, our data indicates the cheapest price to be C$ 331. The most popular route (Ottawa - Chicago O'Hare Intl), is priced around C$ 513.

  • 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 C$ 532). Flying from Ottawa to Illinois in January is currently the most expensive (average of C$ 1,137). 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.
Toronto Island to Newark flights
Pearson Intl to Newark flights
Pearson Intl to LaGuardia flights
Pearson Intl to John F Kennedy Intl flights
Pearson Intl to Fort Lauderdale flights
Pierre Elliott Trudeau Intl to Miami flights
Pierre Elliott Trudeau Intl to LaGuardia flights
Pearson Intl to Orlando flights
Pearson Intl to Los Angeles flights
Pierre Elliott Trudeau Intl to Newark flights
Toronto Island to LaGuardia flights
Toronto Island to John F Kennedy Intl flights
Pearson Intl to Las Vegas flights
Pearson Intl to Miami flights
Pierre Elliott Trudeau Intl to Fort Lauderdale flights
Pearson Intl to San Francisco flights
Hamilton to Newark flights
Pearson Intl to Dallas/Fort Worth flights
Pierre Elliott Trudeau Intl to John F Kennedy Intl flights
Pearson Intl to Seattle flights
Pearson Intl to O'Hare Intl flights
Pearson Intl to Reagan-National flights
Pierre Elliott Trudeau Intl to Los Angeles flights
Pearson Intl to Dulles Intl flights
Pearson Intl to Nashville flights
Pierre Elliott Trudeau Intl to Orlando flights
Toronto Island to Fort Lauderdale flights
Toronto Island to Orlando flights
Pierre Elliott Trudeau Intl to O'Hare Intl flights
Pearson Intl to Boston flights
Pierre Elliott Trudeau Intl to Las Vegas flights
Pearson Intl to Hobby flights
Pearson Intl to Midway flights
Toronto Island to Boston flights
Pearson Intl to Atlanta flights
Pearson Intl to George Bush Intcntl flights
Pearson Intl to Ontario flights
Pearson Intl to Philadelphia flights
Pearson Intl to San Diego flights
Toronto Island to Midway flights
Pierre Elliott Trudeau Intl to Dallas/Fort Worth flights
Toronto Island to Dulles Intl flights
Pearson Intl to Tampa flights
Toronto Island to Las Vegas flights
Toronto Island to O'Hare Intl flights
Pierre Elliott Trudeau Intl to Nashville flights
Pearson Intl to Fort Myers flights
Pearson Intl to Minneapolis flights
Hamilton to Fort Lauderdale flights
Pearson Intl to Sky Harbor Intl 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 629,999 searches. Data last updated 28 July 2026.
AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapestC$ 423AverageC$ 1,000FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
United AirlinesCheapestC$ 481AverageC$ 779FlexibilityNo cancel feeOn-time69%
Search United Airlines flights

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travelers can enjoy low prices and a wide availability of flights to their desired destinations.

How does Cheapflights help users find flights from Ottawa to Illinois?

Cheapflights makes it easy to find Ottawa to Illinois flights by helping our users search from 900+ travel sites for deals. We also provide you with filters for cabin, price, airline, airports, number of stops, and many more to narrow down that perfect flight.

Why should you use Cheapflights to find cheap flight tickets from Ottawa to Illinois?

Cheapflights helps you find that perfect flight to Illinois from Ottawa by searching from hundreds of airlines and agencies you know and love. We are also free to use, in case you were wondering!

Can Cheapflights find flights from Ottawa to Illinois with no change fees?

Yes! Cheapflights helps users easily find flights from Ottawa to Illinois with no change fees.

Can Cheapflights notify me if prices for flights from Ottawa to Illinois become cheaper?

Yes, and it’s super simple to set up. Click the bell icon next to the flight deals above and provide a valid email address to enable Price Alerts. That’s it!

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.