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Cheap flights from Ottawa to Illinois from C$ 248

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 7/5. Fares are subject to change and may not be available on all flights or dates of travel.
YOW — ORD
1 Apr — 8 Apr1
1 adult

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 27 March 2025.

Round-trip from

C$ 450

One-way from

C$ 250

Popular in

November

Cheapest in

April

Average price

C$ 615

Good round-trip deal

C$ 606 or less

Good one-way deal

C$ 349 or less
Porter Airlines
  • Porter Airlines
  • 29/4-4/5
  • 2 total stops
  • 11h 43m total
  • Ottawa to Illinois
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Porter Airlines
  • Porter Airlines
  • 9/5
  • 1 total stop
  • 5h 19m total
  • Ottawa to Illinois
Search Deals
Highest demand for flights based on searches. 6% potential increase in price (C$ 60 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease (C$ 15 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in March 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.
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 27 March 2025.

Tue 29/411:50 a.m.YOW - MDW
1 stop5h 50mPorter Airlines
Sun 4/59:40 a.m.MDW - YOW
1 stop5h 53mPorter Airlines
Deal found 26/3C$ 450
Tue 29/47:00 a.m.YOW - ORD
2 stops12h 17mMultiple Airlines
Sun 4/55:55 a.m.ORD - YOW
3 stops32h 10mMultiple Airlines
Deal found 26/3C$ 502
Wed 2/44:25 p.m.YOW - MDW
1 stop20h 18mMultiple Airlines
Sun 6/45:15 a.m.MDW - YOW
1 stop10h 55mMultiple Airlines
Deal found 25/3C$ 539
Thu 1/55:25 p.m.YOW - ORD
Nonstop2h 29mAir Canada
Mon 5/56:19 p.m.ORD - YOW
Nonstop2h 16mAir Canada
Deal found 25/3C$ 591
Tue 29/45:25 p.m.YOW - ORD
Nonstop2h 29mUnited Airlines
Sun 4/59:00 a.m.ORD - YOW
1 stop4h 27mUnited Airlines
Deal found 26/3C$ 629
Sun 4/55:55 a.m.YOW - ORD
2 stops11h 15mWestJet
Sun 11/56:24 a.m.ORD - YOW
2 stops16h 58mWestJet
Deal found 25/3C$ 652
Thu 3/46:15 a.m.YOW - STL
2 stops12h 37mMultiple Airlines
Fri 4/44:57 p.m.STL - YOW
1 stop23h 15mMultiple Airlines
Deal found 25/3C$ 701
Thu 1/55:55 a.m.YOW - MDW
2 stops13h 25mDelta
Mon 5/59:20 a.m.MDW - YOW
2 stops14h 02mDelta
Deal found 25/3C$ 990
Thu 1/55:55 a.m.YOW - ORD
2 stops11h 13mDelta
Mon 5/59:30 a.m.ORD - YOW
2 stops13h 52mDelta
Deal found 25/3C$ 990
Thu 17/410:05 a.m.YOW - STL
1 stop5h 44mAir Canada
Sun 20/43:30 p.m.STL - YOW
1 stop5h 04mAir Canada
Deal found 24/3C$ 1,006
Thu 17/46:05 a.m.YOW - STL
2 stops9h 37mUnited Airlines
Mon 21/49:39 a.m.STL - YOW
1 stop10h 56mUnited Airlines
Deal found 24/3C$ 1,027
Fri 30/57:15 p.m.YOW - MDW
2 stops15h 20mWestJet
Mon 2/69:20 a.m.MDW - YOW
2 stops14h 21mWestJet
Deal found 25/3C$ 1,173

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 27 March 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

Tue 29/4

11:50 a.m.-4:40 p.m.

1 stop5h 50m

Chicago Midway

Sun 4/5

9:40 a.m.-4:33 p.m.

1 stop5h 53m

C$ 450

OttawaChicago

YOW - ORD

YOWORD

Ottawa

Tue 29/4

7:00 a.m.-6:17 p.m.

2 stops12h 17m

Chicago O'Hare Intl

Sun 4/5

5:55 a.m.-3:05 p.m.

3 stops32h 10m

C$ 502

OttawaChicago

YOW - MDW

YOWMDW

Ottawa

Fri 18/4

5:55 a.m.-4:40 p.m.

1 stop11h 45m

Chicago Midway

Tue 22/4

11:15 a.m.-12:09 a.m.

1 stop11h 54m

C$ 552

OttawaChicago

YOW - ORD

YOWORD

Ottawa

Thu 1/5

5:25 p.m.-6:54 p.m.

Nonstop2h 29m

Chicago O'Hare Intl

Mon 5/5

6:19 p.m.-9:35 p.m.

Nonstop2h 16m

C$ 591

OttawaChicago

YOW - ORD

YOWORD

Ottawa

Tue 29/4

5:25 p.m.-6:54 p.m.

Nonstop2h 29m

Chicago O'Hare Intl

Sun 4/5

9:00 a.m.-2:27 p.m.

1 stop4h 27m

C$ 629

OttawaChicago

YOW - ORD

YOWORD

Ottawa

Sun 4/5

5:55 a.m.-4:10 p.m.

2 stops11h 15m

Chicago O'Hare Intl

Sun 11/5

6:24 a.m.-12:22 a.m.

2 stops16h 58m

C$ 652

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

Thu 17/4

5:45 p.m.-11:45 a.m.

3 stops43h 00m

Lambert-St Louis

Mon 21/4

12:15 p.m.-5:09 p.m.

3 stops27h 54m

C$ 786

OttawaChicago

YOW - MDW

YOWMDW

Ottawa

Thu 1/5

5:55 a.m.-6:20 p.m.

2 stops13h 25m

Chicago Midway

Mon 5/5

9:20 a.m.-12:22 a.m.

2 stops14h 02m

C$ 990

OttawaChicago

YOW - ORD

YOWORD

Ottawa

Thu 1/5

5:55 a.m.-4:08 p.m.

2 stops11h 13m

Chicago O'Hare Intl

Mon 5/5

9:30 a.m.-12:22 a.m.

2 stops13h 52m

C$ 990

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

Thu 17/4

10:05 a.m.-2:49 p.m.

1 stop5h 44m

Lambert-St Louis

Sun 20/4

3:30 p.m.-9:34 p.m.

1 stop5h 04m

C$ 1,006

Flights are sorted by cheapest round-trip flights first.

Deals found on 25/3

Showing 1-10 of 22 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, January is the cheapest month in which you can book a flight from Ottawa to Illinois (average of C$ 261). Flying from Ottawa to Illinois in March is currently the most expensive (average of C$ 355). 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 27 March 2025.

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.

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 43.0 - 125.0 mm per month. August is typically the wettest month, when rainfall can reach 125.0 mm. January is typically the driest time to visit Illinois when rainfall is around 43.0 mm.

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 23.0 C. Travellers hoping to avoid the cold should look outside of January, when temperatures are typically at their lowest (around -5.0 C).

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 27 March 2025.
Get a feel of what it's like to fly with Delta, Porter Airlines and United Airlines from Ottawa to Illinois by reading reviews from past customers. 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.
Delta
8.0
Very good
7,895 reviews
Check prices

Entertainment

7.9

Food

7.3

Crew

8.5

Comfort

8.0

Overall

8.0

Boarding

8.2

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
Delta
8.0
Very good
7,895 reviews
Delta
8.0
Very good
7,895 reviews
Check prices

Entertainment

7.9

Food

7.3

Crew

8.5

Comfort

8.0

Overall

8.0

Boarding

8.2

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
Porter Airlines
7.9
Good
276 reviews
Delta
8.0
Very good
7,895 reviews
Check prices

Entertainment

7.9

Food

7.3

Crew

8.5

Comfort

8.0

Overall

8.0

Boarding

8.2

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
United Airlines
7.4
Good
8,603 reviews
Delta
8.0
Very good
7,895 reviews
Check prices

Entertainment

7.9

Food

7.3

Crew

8.5

Comfort

8.0

Overall

8.0

Boarding

8.2

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
WestJet
7.2
Good
2,785 reviews
Delta
8.0
Very good
7,895 reviews
Check prices

Entertainment

7.9

Food

7.3

Crew

8.5

Comfort

8.0

Overall

8.0

Boarding

8.2

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
Air Canada
7.0
Good
8,972 reviews
Delta
8.0
Very good
7,895 reviews
Check prices

Entertainment

7.9

Food

7.3

Crew

8.5

Comfort

8.0

Overall

8.0

Boarding

8.2

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

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.

  • What are the cheapest airlines to fly from Ottawa to Illinois one-way?

    The cheapest airline one-way is Porter Airlines, with whom users have recently found tickets for as low as C$ 250. However, be on the lookout for offers from WestJet and Air Canada, as they are both options that can get you from Ottawa to Illinois for a low price.

  • 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: ANA (81%), GoJet (80%), Avianca( 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$ 2,018, our data indicates the cheapest price to be C$ 228. The most popular route (Ottawa - Chicago O'Hare Intl), is priced around C$ 484.

  • 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, January is the cheapest month in which you can book a flight from Ottawa to Illinois (average of C$ 261). Flying from Ottawa to Illinois in March is currently the most expensive (average of C$ 355). 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 3 airlines flying from Ottawa to Illinois

Discover the top 3 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 27 March 2025.
AirlineCheapestAverageFlexibilityOn-time
Porter AirlinesCheapestC$ 388AverageC$ 579FlexibilityNo cancel feeOn-time52%
Search Porter Airlines flights
Air CanadaCheapestC$ 598AverageC$ 757FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
United AirlinesCheapestC$ 629AverageC$ 820FlexibilityNo 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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