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Cheap flights from Ottawa to Illinois from C$ 229

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 1/4. Fares are subject to change and may not be available on all flights or dates of travel.
YOW — ORD
26 Feb — 5 Mar1
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 21 February 2025.

Round-trip from

C$ 473

One-way from

C$ 230

Popular in

November

Cheapest in

April

Average price

C$ 639

Good round-trip deal

C$ 580 or less

Good one-way deal

C$ 282 or less
19/3-26/3
  • 19/3-26/3
  • 4 total stops
  • 45h 04m total
  • Ottawa to Illinois
Search Deals
19/3
  • 19/3
  • 2 total stops
  • 27h 25m total
  • Ottawa to Illinois
Search Deals
Highest demand for flights based on searches. 5% potential increase in price (C$ 54 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease (C$ 14 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in February 2025
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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 21 February 2025.

Wed 19/35:55 a.m.YOW - ORD
2 stops19h 03mMultiple Airlines
Wed 26/39:08 p.m.ORD - YOW
2 stops26h 01mMultiple Airlines
Deal found 19/2C$ 473
Thu 22/512:25 p.m.YOW - MDW
1 stop4h 59mPorter Airlines
Sat 24/59:15 a.m.MDW - YOW
1 stop7h 59mPorter Airlines
Deal found 20/2C$ 484
Sun 4/56:00 a.m.YOW - ORD
1 stop4h 52mAir Canada
Sat 10/58:40 a.m.ORD - YOW
1 stop4h 05mAir Canada
Deal found 19/2C$ 531
Thu 20/35:55 a.m.YOW - MDW
1 stop11h 45mMultiple Airlines
Thu 27/311:15 a.m.MDW - YOW
1 stop4h 54mMultiple Airlines
Deal found 20/2C$ 553
Sat 10/55:25 p.m.YOW - ORD
Nonstop2h 29mUnited Airlines
Fri 16/51:55 p.m.ORD - YOW
Nonstop2h 11mUnited Airlines
Deal found 19/2C$ 607
Thu 20/35:55 a.m.YOW - MDW
2 stops7h 41mDelta
Thu 27/312:51 p.m.MDW - YOW
2 stops10h 18mDelta
Deal found 20/2C$ 653
Fri 21/311:25 a.m.YOW - STL
1 stop5h 06mAir Canada
Mon 24/311:05 a.m.STL - YOW
1 stop5h 01mAir Canada
Deal found 19/2C$ 724
Thu 1/56:00 a.m.YOW - ORD
1 stop11h 44mWestJet
Mon 5/55:30 p.m.ORD - YOW
2 stops21h 50mWestJet
Deal found 18/2C$ 732
Sat 5/44:20 p.m.YOW - STL
1 stop26h 32mMultiple Airlines
Sat 12/412:15 p.m.STL - YOW
3 stops30h 57mMultiple Airlines
Deal found 19/2C$ 777
Tue 13/56:05 a.m.YOW - STL
2 stops10h 42mUnited Airlines
Sat 17/53:43 p.m.STL - YOW
1 stop4h 52mUnited Airlines
Deal found 19/2C$ 862
Wed 19/35:55 a.m.YOW - ORD
2 stops26h 45mDelta
Wed 26/37:15 a.m.ORD - YOW
2 stops15h 54mDelta
Deal found 18/2C$ 999
Thu 2/106:00 a.m.YOW - MDW
2 stops13h 03mWestJet
Sat 18/101:05 p.m.MDW - YOW
2 stops15h 23mWestJet
Deal found 19/2C$ 1,165

Find flights from Ottawa to Illinois within your budget

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 21 February 2025.

Fly from

Ottawa

Fly to

Illinois

Route

Depart

Return

Price

OttawaChicago

YOW - ORD

YOWORD

Ottawa

Wed 19/3

5:55 a.m.-11:58 p.m.

2 stops19h 03m

Chicago O'Hare Intl

Wed 26/3

9:08 p.m.-12:09 a.m.

2 stops26h 01m

C$ 473

OttawaChicago

YOW - MDW

YOWMDW

Ottawa

Thu 22/5

12:25 p.m.-4:24 p.m.

1 stop4h 59m

Chicago Midway

Sat 24/5

9:15 a.m.-6:14 p.m.

1 stop7h 59m

C$ 484

OttawaChicago

YOW - ORD

YOWORD

Ottawa

Sun 4/5

6:33 a.m.-8:02 a.m.

Nonstop2h 29m

Chicago O'Hare Intl

Thu 8/5

10:53 a.m.-2:04 p.m.

Nonstop2h 11m

C$ 531

OttawaChicago

YOW - MDW

YOWMDW

Ottawa

Thu 20/3

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

1 stop11h 45m

Chicago Midway

Thu 27/3

11:15 a.m.-5:09 p.m.

1 stop4h 54m

C$ 553

OttawaChicago

YOW - ORD

YOWORD

Ottawa

Sat 10/5

10:37 a.m.-12:03 p.m.

Nonstop2h 26m

Chicago O'Hare Intl

Wed 21/5

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

Nonstop2h 16m

C$ 607

OttawaChicago

YOW - MDW

YOWMDW

Ottawa

Thu 20/3

5:55 a.m.-12:36 p.m.

2 stops7h 41m

Chicago Midway

Thu 27/3

12:51 p.m.-12:09 a.m.

2 stops10h 18m

C$ 653

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

Fri 21/3

11:25 a.m.-3:31 p.m.

1 stop5h 06m

Lambert-St Louis

Mon 24/3

11:05 a.m.-5:06 p.m.

1 stop5h 01m

C$ 724

OttawaChicago

YOW - ORD

YOWORD

Ottawa

Thu 1/5

6:00 a.m.-4:44 p.m.

1 stop11h 44m

Chicago O'Hare Intl

Mon 5/5

5:30 p.m.-4:20 p.m.

2 stops21h 50m

C$ 732

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

Sat 5/4

4:20 p.m.-5:52 p.m.

1 stop26h 32m

Lambert-St Louis

Sat 12/4

12:15 p.m.-8:12 p.m.

3 stops30h 57m

C$ 777

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

Tue 13/5

6:05 a.m.-3:47 p.m.

2 stops10h 42m

Lambert-St Louis

Sat 17/5

3:43 p.m.-9:35 p.m.

1 stop4h 52m

C$ 862

Flights are sorted by cheapest round-trip flights first.

Deals found on 20/2

Showing 1-10 of 21 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.

Travel insights for flights from Ottawa to Illinois

Get recent, data-driven insights about flights from Ottawa to Illinois including ideal travel times, pricing trends, and more.

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 21 February 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.

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 21 February 2025.

The most flights from YOW to USIL are scheduled on a Tuesday (12 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (6 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 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 21 February 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
8,219 reviews
Check prices

Food

7.3

Crew

8.5

Entertainment

7.9

Boarding

8.2

Comfort

8.0

Overall

8.0

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
8,219 reviews
Delta
8.0
Very good
8,219 reviews
Check prices

Food

7.3

Crew

8.5

Entertainment

7.9

Boarding

8.2

Comfort

8.0

Overall

8.0

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
8,219 reviews
Check prices

Food

7.3

Crew

8.5

Entertainment

7.9

Boarding

8.2

Comfort

8.0

Overall

8.0

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
8,765 reviews
Delta
8.0
Very good
8,219 reviews
Check prices

Food

7.3

Crew

8.5

Entertainment

7.9

Boarding

8.2

Comfort

8.0

Overall

8.0

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
2,801 reviews
Delta
8.0
Very good
8,219 reviews
Check prices

Food

7.3

Crew

8.5

Entertainment

7.9

Boarding

8.2

Comfort

8.0

Overall

8.0

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
8,748 reviews
Delta
8.0
Very good
8,219 reviews
Check prices

Food

7.3

Crew

8.5

Entertainment

7.9

Boarding

8.2

Comfort

8.0

Overall

8.0

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$ 251. However, be on the lookout for offers from Air Canada and United Airlines, 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: GoJet (100%), ANA (74%), Avianca( 72%).

  • 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$ 1,132, our data indicates the cheapest price to be C$ 204. The most popular route (Ottawa - Chicago O'Hare Intl), is priced around C$ 412.

  • 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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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 21 February 2025.
AirlineCheapestAverageFlexibilityOn-time
Porter AirlinesCheapestC$ 386AverageC$ 562FlexibilityNo cancel feeOn-time52%
Search Porter Airlines flights
Air CanadaCheapestC$ 547AverageC$ 753FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
United AirlinesCheapestC$ 620AverageC$ 806FlexibilityNo 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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