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Cheap flights from Ottawa to Illinois from C$ 220

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 19/3. Fares are subject to change and may not be available on all flights or dates of travel.
YOW — ORD
26 Jan — 2 Feb1
1 adult

Cheap flight deals from Ottawa to Illinois

Discover tips and strategies to find the most affordable flight options for your journey from Ottawa (YOW) to Illinois (USIL). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated 21 January 2025.

Round-trip from

C$ 351

One-way from

C$ 220

Good round-trip deal

C$ 640 or less

Good one-way deal

C$ 307 or less
Porter Airlines
  • Porter Airlines
  • 9/2-13/2
  • 2 total stops
  • 11h 04m total
  • Ottawa to Illinois
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Porter Airlines
  • Porter Airlines
  • 19/3
  • 1 total stop
  • 5h 50m total
  • Ottawa to Illinois
Search Deals
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.
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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 January 2025.

Sun 9/28:35 a.m.YOW - MDW
1 stop4h 35mPorter Airlines
Thu 13/21:05 p.m.MDW - YOW
1 stop6h 29mPorter Airlines
Deal found 19/1C$ 351
Thu 3/46:15 a.m.YOW - ORD
1 stop10h 41mWestJet
Sun 6/44:45 p.m.ORD - YOW
1 stop30h 59mWestJet
Deal found 21/1C$ 468
Wed 29/15:55 a.m.YOW - ORD
2 stops28h 44mMultiple Airlines
Wed 5/23:56 p.m.ORD - YOW
1 stop24h 59mMultiple Airlines
Deal found 21/1C$ 486
Fri 21/211:25 a.m.YOW - ORD
Nonstop2h 34mAir Canada
Mon 24/26:13 p.m.ORD - YOW
Nonstop2h 11mAir Canada
Deal found 21/1C$ 604
Fri 21/211:25 a.m.YOW - ORD
Nonstop2h 34mUnited Airlines
Mon 24/29:00 a.m.ORD - YOW
1 stop4h 35mUnited Airlines
Deal found 21/1C$ 619
Mon 17/28:40 a.m.YOW - MDW
2 stops9h 53mMultiple Airlines
Mon 24/21:05 p.m.MDW - YOW
1 stop4h 29mMultiple Airlines
Deal found 20/1C$ 626
Tue 4/34:20 p.m.YOW - STL
3 stops44h 10mMultiple Airlines
Tue 11/35:38 p.m.STL - YOW
2 stops22h 32mMultiple Airlines
Deal found 21/1C$ 655
Wed 9/46:05 a.m.YOW - STL
2 stops9h 37mUnited Airlines
Wed 16/49:39 a.m.STL - YOW
2 stops13h 14mUnited Airlines
Deal found 21/1C$ 865
Fri 7/39:35 p.m.YOW - STL
2 stops14h 24mWestJet
Mon 17/311:19 a.m.STL - YOW
2 stops36h 25mWestJet
Deal found 21/1C$ 1,009
Mon 3/34:20 p.m.YOW - MDW
2 stops31h 00mDelta
Thu 13/39:25 a.m.MDW - YOW
2 stops13h 44mDelta
Deal found 21/1C$ 1,023
Thu 3/77:15 p.m.YOW - MDW
2 stops27h 32mWestJet
Mon 7/79:20 a.m.MDW - YOW
2 stops14h 21mWestJet
Deal found 20/1C$ 1,160
Fri 11/45:55 a.m.YOW - ORD
2 stops11h 16mDelta
Wed 16/45:50 a.m.ORD - YOW
2 stops17h 19mDelta
Deal found 21/1C$ 1,376

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 January 2025.

Fly from

Any airport

Fly to

Any airport

Route

Depart

Return

Price

OttawaChicago

YOW - MDW

YOWMDW

Ottawa

Sun 9/2

8:35 a.m.-12:10 p.m.

1 stop4h 35m

Chicago Midway

Thu 13/2

1:05 p.m.-8:34 p.m.

1 stop6h 29m

C$ 351

OttawaChicago

YOW - ORD

YOWORD

Ottawa

Thu 3/4

6:15 a.m.-3:56 p.m.

1 stop10h 41m

Chicago O'Hare Intl

Sun 6/4

4:45 p.m.-12:44 a.m.

1 stop30h 59m

C$ 468

OttawaChicago

YOW - ORD

YOWORD

Ottawa

Mon 24/3

6:15 a.m.-3:56 p.m.

1 stop10h 41m

Chicago O'Hare Intl

Sun 30/3

4:45 p.m.-6:34 p.m.

2 stops24h 49m

C$ 488

OttawaChicago

YOW - ORD

YOWORD

Ottawa

Fri 21/2

11:25 a.m.-12:59 p.m.

Nonstop2h 34m

Chicago O'Hare Intl

Mon 24/2

6:13 p.m.-9:24 p.m.

Nonstop2h 11m

C$ 604

OttawaChicago

YOW - ORD

YOWORD

Ottawa

Fri 21/2

11:25 a.m.-12:59 p.m.

Nonstop2h 34m

Chicago O'Hare Intl

Mon 24/2

9:00 a.m.-2:35 p.m.

1 stop4h 35m

C$ 619

OttawaChicago

YOW - MDW

YOWMDW

Ottawa

Mon 17/2

8:40 a.m.-5:33 p.m.

2 stops9h 53m

Chicago Midway

Mon 24/2

1:05 p.m.-6:34 p.m.

1 stop4h 29m

C$ 626

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

Tue 4/3

4:20 p.m.-11:30 a.m.

3 stops44h 10m

Lambert-St Louis

Tue 11/3

5:38 p.m.-5:10 p.m.

2 stops22h 32m

C$ 655

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

Wed 9/4

6:05 a.m.-2:42 p.m.

2 stops9h 37m

Lambert-St Louis

Wed 16/4

9:39 a.m.-11:53 p.m.

2 stops13h 14m

C$ 865

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

Fri 7/3

10:05 a.m.-3:06 p.m.

1 stop6h 01m

Lambert-St Louis

Mon 17/3

3:50 p.m.-11:47 p.m.

1 stop6h 57m

C$ 875

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

Fri 7/3

9:35 p.m.-10:59 a.m.

2 stops14h 24m

Lambert-St Louis

Mon 17/3

11:19 a.m.-12:44 a.m.

2 stops36h 25m

C$ 1,009

Flights are sorted by cheapest round-trip flights first.

Deals found on 21/1

Showing 1-10 of 20 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 January 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 January 2025.

The most flights from YOW to USIL are scheduled on a Monday (8 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (8 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 January 2025.
Get a feel of what it's like to fly with WestJet, Air Canada 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
8,521 reviews
Check prices

Comfort

8.0

Food

7.3

Overall

8.0

Entertainment

7.9

Crew

8.6

Boarding

8.2

Reviews

1 / 10

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

Delta
8.0
Very good
8,521 reviews
Delta
8.0
Very good
8,521 reviews
Check prices

Comfort

8.0

Food

7.3

Overall

8.0

Entertainment

7.9

Crew

8.6

Boarding

8.2

Reviews

1 / 10

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

Porter Airlines
7.9
Good
277 reviews
Delta
8.0
Very good
8,521 reviews
Check prices

Comfort

8.0

Food

7.3

Overall

8.0

Entertainment

7.9

Crew

8.6

Boarding

8.2

Reviews

1 / 10

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

United Airlines
7.4
Good
8,985 reviews
Delta
8.0
Very good
8,521 reviews
Check prices

Comfort

8.0

Food

7.3

Overall

8.0

Entertainment

7.9

Crew

8.6

Boarding

8.2

Reviews

1 / 10

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

WestJet
7.2
Good
2,829 reviews
Delta
8.0
Very good
8,521 reviews
Check prices

Comfort

8.0

Food

7.3

Overall

8.0

Entertainment

7.9

Crew

8.6

Boarding

8.2

Reviews

1 / 10

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

Air Canada
7.0
Good
8,635 reviews
Delta
8.0
Very good
8,521 reviews
Check prices

Comfort

8.0

Food

7.3

Overall

8.0

Entertainment

7.9

Crew

8.6

Boarding

8.2

Reviews

1 / 10

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$ 220. However, be on the lookout for offers from United Airlines 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: Avianca (80%), ANA (72%), Republic Airways( 71%).

  • 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$ 1,542, our data indicates the cheapest price to be C$ 224. The most popular route (Ottawa - Chicago O'Hare Intl), is priced around C$ 406.

  • 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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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 21 January 2025.
AirlineCheapestAverageFlexibilityOn-time
Porter AirlinesCheapestC$ 391AverageC$ 568FlexibilityNo cancel feeOn-time52%
Search Porter Airlines flights
Air CanadaCheapestC$ 558AverageC$ 757FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
United AirlinesCheapestC$ 628AverageC$ 847FlexibilityNo 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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