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Cheap flights from Ottawa to Illinois from C$ 287

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 3/8. Fares are subject to change and may not be available on all flights or dates of travel.
YOW — ORD
15 Jul — 22 Jul1
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 15 June 2026.

Mon 14/126:00 p.m.
YOW
-
STL
1 stop6h 25m
United Airlines
Tue 15/1210:23 a.m.
STL
-
YOW
1 stop5h 51m
United Airlines
Deal found 11/6C$ 524
Tue 18/82:35 p.m.
YOW
-
STL
1 stop5h 07m
Air Canada
Sat 7/114:15 p.m.
STL
-
YOW
1 stop6h 33m
Air Canada
Deal found 11/6C$ 534
Tue 18/86:05 a.m.
YOW
-
STL
2 stops10h 33m
United Airlines
Sat 7/119:23 a.m.
STL
-
YOW
1 stop11h 11m
United Airlines
Deal found 11/6C$ 535
Tue 28/79:00 a.m.
YOW
-
STL
1 stop6h 02m
Air Canada
Tue 4/812:10 p.m.
STL
-
YOW
1 stop6h 35m
Air Canada
Deal found 13/6C$ 544
Mon 20/75:50 p.m.
YOW
-
STL
1 stop6h 54m
United Airlines
Fri 24/71:13 p.m.
STL
-
YOW
1 stop7h 22m
United Airlines
Deal found 14/6C$ 545
Tue 1/910:37 a.m.
YOW
-
STL
1 stop6h 01m
United Airlines
Wed 2/97:25 a.m.
STL
-
YOW
1 stop13h 10m
United Airlines
Deal found 10/6C$ 546
Fri 3/76:25 a.m.
YOW
-
STL
1 stop10h 21m
United Airlines
Tue 7/76:00 a.m.
STL
-
YOW
1 stop6h 59m
United Airlines
Deal found 11/6C$ 549
Thu 24/96:55 a.m.
YOW
-
ORD
1 stop8h 40m
Multiple Airlines
Sun 27/911:45 a.m.
ORD
-
YOW
1 stop19h 20m
Multiple Airlines
Deal found 11/6C$ 551
Wed 21/108:40 a.m.
YOW
-
ORD
1 stop6h 25m
American Airlines
Tue 27/1011:40 a.m.
ORD
-
YOW
1 stop5h 44m
American Airlines
Deal found 12/6C$ 552
Wed 26/87:00 a.m.
YOW
-
ORD
2 stops30h 25m
Multiple Airlines
Sat 5/97:00 a.m.
ORD
-
YOW
1 stop4h 54m
Multiple Airlines
Deal found 13/6C$ 553
Thu 17/96:25 p.m.
YOW
-
ORD
1 stop17h 35m
Multiple Airlines
Mon 21/93:20 p.m.
ORD
-
YOW
1 stop15h 45m
Multiple Airlines
Deal found 14/6C$ 556
Thu 10/96:25 p.m.
YOW
-
ORD
1 stop17h 35m
Multiple Airlines
Mon 14/93:20 p.m.
ORD
-
YOW
1 stop15h 45m
Multiple Airlines
Deal found 14/6C$ 562

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 15 June 2026.

Round-trip from

C$ 534

One-way from

C$ 287

Popular in

January

Cheapest in

February

Average price

C$ 704

Good round-trip deal

C$ 635 or less

Good one-way deal

C$ 409 or less
Air Canada
  • Air Canada
  • 18/8-7/11
  • 2 total stops
  • 11h 40m total
  • Ottawa to Illinois
Search Deals
3/8
  • 3/8
  • 1 total stop
  • 30h 15m total
  • Ottawa to Illinois
Search Deals
Highest demand for flights based on searches. 10% potential increase in price (C$ 103 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 6% potential price decrease (C$ 59 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in June 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 15 June 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

Tue 18/8

2:35 p.m.-6:42 p.m.

1 stop5h 07m

Lambert-St Louis

Sat 7/11

4:15 p.m.-11:48 p.m.

1 stop6h 33m

C$ 534

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

Mon 27/7

5:50 p.m.-11:44 p.m.

1 stop6h 54m

Lambert-St Louis

Mon 3/8

4:53 p.m.-9:11 a.m.

1 stop15h 18m

C$ 545

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

Tue 28/7

6:25 a.m.-3:46 p.m.

1 stop10h 21m

Lambert-St Louis

Tue 4/8

1:13 p.m.-11:54 p.m.

2 stops9h 41m

C$ 545

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

Tue 1/9

10:37 a.m.-3:38 p.m.

1 stop6h 01m

Lambert-St Louis

Wed 2/9

7:25 a.m.-9:35 p.m.

1 stop13h 10m

C$ 546

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

Fri 3/7

3:10 p.m.-11:44 p.m.

1 stop9h 34m

Lambert-St Louis

Tue 7/7

11:25 a.m.-5:07 p.m.

1 stop4h 42m

C$ 549

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

Tue 18/8

6:05 a.m.-3:38 p.m.

2 stops10h 33m

Lambert-St Louis

Sat 7/11

6:45 p.m.-2:30 p.m.

2 stops18h 45m

C$ 619

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

Thu 30/7

6:25 a.m.-12:11 p.m.

1 stop6h 46m

Lambert-St Louis

Thu 6/8

10:20 a.m.-9:35 p.m.

1 stop10h 15m

C$ 628

OttawaChicago

YOW - MDW

YOWMDW

Ottawa

Thu 6/8

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

1 stop4h 55m

Chicago Midway

Tue 11/8

3:15 p.m.-8:05 a.m.

1 stop15h 50m

C$ 683

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

Wed 1/7

6:05 a.m.-9:29 p.m.

2 stops16h 24m

Lambert-St Louis

Sun 5/7

9:20 a.m.-9:35 p.m.

1 stop11h 15m

C$ 711

OttawaChicago

YOW - MDW

YOWMDW

Ottawa

Fri 14/8

8:45 p.m.-9:40 a.m.

1 stop13h 55m

Chicago Midway

Thu 20/8

3:15 p.m.-9:44 p.m.

1 stop5h 29m

C$ 758

Flights are sorted by cheapest round-trip flights first.

Deals found on 14/6

Showing 1-10 of 53 resultsSorted by cheapest first
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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, August is the cheapest month in which you can book a flight from Ottawa to Illinois (average of C$ 183). Flying from Ottawa to Illinois in January is currently the most expensive (average of C$ 753). 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 15 June 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 15 June 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?

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 15 June 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
438 reviews
Check prices

Boarding

8.2

Comfort

8.0

Overall

8.0

Crew

8.6

Food

7.6

Entertainment

6.9

Reviews

1 / 20
6.0
Good

Justin,May 2026

YYZ - MCO

Staff very nice. Seats were uncomfortable. Complimentary snacks leave much to be desired.
Porter Airlines
8.0
Very good
438 reviews
Porter Airlines
8.0
Very good
438 reviews
Check prices

Boarding

8.2

Comfort

8.0

Overall

8.0

Crew

8.6

Food

7.6

Entertainment

6.9

Reviews

1 / 20
6.0
Good

Justin,May 2026

YYZ - MCO

Staff very nice. Seats were uncomfortable. Complimentary snacks leave much to be desired.
United Airlines
7.4
Good
9,830 reviews
Porter Airlines
8.0
Very good
438 reviews
Check prices

Boarding

8.2

Comfort

8.0

Overall

8.0

Crew

8.6

Food

7.6

Entertainment

6.9

Reviews

1 / 20
6.0
Good

Justin,May 2026

YYZ - MCO

Staff very nice. Seats were uncomfortable. Complimentary snacks leave much to be desired.
Air Canada
7.1
Good
11,194 reviews
Porter Airlines
8.0
Very good
438 reviews
Check prices

Boarding

8.2

Comfort

8.0

Overall

8.0

Crew

8.6

Food

7.6

Entertainment

6.9

Reviews

1 / 20
6.0
Good

Justin,May 2026

YYZ - MCO

Staff very nice. Seats were uncomfortable. Complimentary snacks leave much to be desired.

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?

    Air Canada, United Airlines, and Porter Airlines can get you from Ottawa to Illinois in just under 4h 55m. Your travel time can differ by up to 5h 38m. 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 (86%), ANA (85%), Air Canada( 80%).

  • 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$ 692, our data indicates the cheapest price to be C$ 284. The most popular route (Ottawa - Chicago O'Hare Intl), is priced around C$ 553.

  • 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 C$ 183). Flying from Ottawa to Illinois in January is currently the most expensive (average of C$ 753). 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 629,999 searches. Data last updated 15 June 2026.
AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapestC$ 419AverageC$ 866FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
United AirlinesCheapestC$ 470AverageC$ 630FlexibilityNo 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!

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