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$138+ Cheap flights from Ottawa (YOW) to Illinois

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 5/11. Fares are subject to change and may not be available on all flights or dates of travel.
YOW — ORD
abr. 20 — abr. 271
dom. 4/20
dom. 4/27
1 adult, Economy
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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 abril 15, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$260
(Booking.com)

One-way from

$138
(Mytrip)

Popular in

November

Cheapest in

May

Average price

$395

Good round-trip deal

$390 or less

Good one-way deal

$239 or less
Provider with most accurate pricing for Ottawa-Chicago (CHI) flight deals.
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Provider most trusted by Cheapflights users for Ottawa-Chicago (CHI) flights.
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From Ottawa to Illinois
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One-way flight from Ottawa to Illinois
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Highest demand for flights based on searches. 6% potential increase in price ($27 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($7 potential savings vs. average RT price).
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Average for round-trip flights in April 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.
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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 abril 15, 2025.

This Booking.com deal was found by Cheapflights users on 4/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 5/2312:35 pmYOW - MDW
1 stop5h 19mPorter Airlines
vie. 5/309:40 amMDW - YOW
1 stop5h 53mPorter Airlines
Deal found 4/15$260
This Kiwi.com deal was found by Cheapflights users on 4/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 5/243:50 pmYOW - ORD
1 stop9h 15mMultiple Airlines
jue. 5/295:51 amORD - YOW
1 stop8h 05mMultiple Airlines
Deal found 4/15$320
This Kissandfly.com deal was found by Cheapflights users on 4/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kissandfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 5/227:00 amYOW - MDW
2 stops14h 17mMultiple Airlines
lun. 5/269:40 amMDW - YOW
1 stop5h 53mMultiple Airlines
Deal found 4/15$375
This Flightnetwork deal was found by Cheapflights users on 4/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Flightnetwork is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 5/225:25 pmYOW - ORD
Nonstop2h 28mAir Canada
dom. 5/251:56 pmORD - YOW
Nonstop2h 10mAir Canada
Deal found 4/15$435
This FlightHub deal was found by Cheapflights users on 4/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 5/145:55 amYOW - ORD
2 stops17h 46mWestJet
lun. 5/265:30 pmORD - YOW
1 stop30h 12mWestJet
Deal found 4/14$455
This United Airlines deal was found by Cheapflights users on 4/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 8/25:25 pmYOW - ORD
Nonstop2h 28mUnited Airlines
mié. 8/68:00 amORD - YOW
1 stop5h 27mUnited Airlines
Deal found 4/15$456
This Kissandfly.com deal was found by Cheapflights users on 4/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kissandfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 5/3010:15 amYOW - ORD
3 stops14h 43mPorter Airlines
vie. 6/67:00 amORD - YOW
1 stop9h 18mPorter Airlines
Deal found 4/15$498
This Air Canada deal was found by Cheapflights users on 4/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 6/212:25 pmYOW - STL
1 stop6h 33mAir Canada
dom. 6/225:00 amSTL - YOW
1 stop8h 04mAir Canada
Deal found 4/14$574
This United Airlines deal was found by Cheapflights users on 4/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 6/215:15 amYOW - STL
2 stops11h 15mUnited Airlines
dom. 6/228:10 amSTL - YOW
1 stop4h 54mUnited Airlines
Deal found 4/14$583
This FlightHub deal was found by Cheapflights users on 4/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 6/215:55 amYOW - STL
2 stops28h 42mWestJet
dom. 6/221:30 pmSTL - YOW
2 stops9h 52mWestJet
Deal found 4/14$597
This United Airlines deal was found by Cheapflights users on 4/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 5/157:29 pmYOW - DEC
2 stops14h 25mUnited Airlines
jue. 5/229:45 amDEC - YOW
1 stop10h 50mUnited Airlines
Deal found 4/15$628
This Delta deal was found by Cheapflights users on 4/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dom. 5/256:10 amYOW - ORD
2 stops18h 49mDelta
sáb. 5/316:59 pmORD - YOW
2 stops22h 22mDelta
Deal found 4/15$636

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 2,558,603 searches. Data last updated abril 15, 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

vie. 5/23

12:35 pm-4:54 pm

1 stop5h 19m

Chicago Midway

vie. 5/30

9:40 am-4:33 pm

1 stop5h 53m

$260

OttawaChicago

YOW - ORD

YOWORD

Ottawa

sáb. 5/24

3:50 pm-12:05 am

1 stop9h 15m

Chicago O'Hare Intl

jue. 5/29

5:51 am-2:56 pm

1 stop8h 05m

$320

OttawaChicago

YOW - MDW

YOWMDW

Ottawa

jue. 5/22

7:00 am-8:17 pm

2 stops14h 17m

Chicago Midway

lun. 5/26

9:40 am-4:33 pm

1 stop5h 53m

$375

OttawaChicago

YOW - ORD

YOWORD

Ottawa

jue. 5/22

5:25 pm-6:53 pm

Nonstop2h 28m

Chicago O'Hare Intl

dom. 5/25

1:56 pm-5:06 pm

Nonstop2h 10m

$435

OttawaChicago

YOW - ORD

YOWORD

Ottawa

mié. 5/14

5:55 am-10:41 pm

2 stops17h 46m

Chicago O'Hare Intl

lun. 5/26

5:30 pm-12:42 am

1 stop30h 12m

$455

OttawaChicago

YOW - ORD

YOWORD

Ottawa

sáb. 8/2

5:25 pm-6:53 pm

Nonstop2h 28m

Chicago O'Hare Intl

mié. 8/6

8:00 am-2:27 pm

1 stop5h 27m

$456

OttawaChicago

YOW - ORD

YOWORD

Ottawa

vie. 5/30

10:15 am-11:58 pm

3 stops14h 43m

Chicago O'Hare Intl

vie. 6/6

7:00 am-5:18 pm

1 stop9h 18m

$498

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

sáb. 6/21

2:25 pm-7:58 pm

1 stop6h 33m

Lambert-St Louis

dom. 6/22

5:00 am-2:04 pm

1 stop8h 04m

$574

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

sáb. 6/21

5:15 am-3:30 pm

2 stops11h 15m

Lambert-St Louis

dom. 6/22

8:10 am-2:04 pm

1 stop4h 54m

$583

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

sáb. 6/21

5:55 am-9:37 am

2 stops28h 42m

Lambert-St Louis

dom. 6/22

1:30 pm-12:22 am

2 stops9h 52m

$597

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/15

Showing 1-10 of 26 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, August is the cheapest month in which you can book a flight from Ottawa to Illinois (average of $245). Flying from Ottawa to Illinois in March is currently the most expensive (average of $321). 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 abril 15, 2025.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Ottawa to Illinois as you normally would.

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 abril 15, 2025.

The most flights from YOW to USIL are scheduled on a Monday (12 on average). You will have fewer flight options on Sunday, which is when the least amount of flights are scheduled (7 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 1.7 - 4.9 inches per month. August is typically the wettest month, when rainfall can reach 4.9 in. January is typically the driest time to visit Illinois when rainfall is around 1.7 in.

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 73.4 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 23.0 F).

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 abril 15, 2025.
Read through reviews of airlines operating flights from Ottawa to Illinois, such as Porter Airlines, Delta and United Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Porter Airlines
8.0
Very good
281 reviews

Comfort

8.0

Overall

8.0

Boarding

8.2

Food

7.6

Crew

8.7

Entertainment

7.0

Reviews

1 / 17
10.0
Excellent

Anonymous,Dec 2024

YYZ - LAS

Everything about the rescheduled (cost me $180) flight great. ***Being denied boarding because I was few minutes under 1.5 hours was not. Stuck at the Kiosk for about 15 minutes before it directed me to the Porter counter was strange. Do not know why checking in online at home was not successful? I think something was up...what can you do?
Porter Airlines
8.0
Very good
281 reviews
Porter Airlines
8.0
Very good
281 reviews

Comfort

8.0

Overall

8.0

Boarding

8.2

Food

7.6

Crew

8.7

Entertainment

7.0

Reviews

1 / 17
10.0
Excellent

Anonymous,Dec 2024

YYZ - LAS

Everything about the rescheduled (cost me $180) flight great. ***Being denied boarding because I was few minutes under 1.5 hours was not. Stuck at the Kiosk for about 15 minutes before it directed me to the Porter counter was strange. Do not know why checking in online at home was not successful? I think something was up...what can you do?
Delta
8.0
Very good
7,917 reviews
Porter Airlines
8.0
Very good
281 reviews

Comfort

8.0

Overall

8.0

Boarding

8.2

Food

7.6

Crew

8.7

Entertainment

7.0

Reviews

1 / 17
10.0
Excellent

Anonymous,Dec 2024

YYZ - LAS

Everything about the rescheduled (cost me $180) flight great. ***Being denied boarding because I was few minutes under 1.5 hours was not. Stuck at the Kiosk for about 15 minutes before it directed me to the Porter counter was strange. Do not know why checking in online at home was not successful? I think something was up...what can you do?
United Airlines
7.4
Good
8,658 reviews
Porter Airlines
8.0
Very good
281 reviews

Comfort

8.0

Overall

8.0

Boarding

8.2

Food

7.6

Crew

8.7

Entertainment

7.0

Reviews

1 / 17
10.0
Excellent

Anonymous,Dec 2024

YYZ - LAS

Everything about the rescheduled (cost me $180) flight great. ***Being denied boarding because I was few minutes under 1.5 hours was not. Stuck at the Kiosk for about 15 minutes before it directed me to the Porter counter was strange. Do not know why checking in online at home was not successful? I think something was up...what can you do?
WestJet
7.2
Good
2,805 reviews
Porter Airlines
8.0
Very good
281 reviews

Comfort

8.0

Overall

8.0

Boarding

8.2

Food

7.6

Crew

8.7

Entertainment

7.0

Reviews

1 / 17
10.0
Excellent

Anonymous,Dec 2024

YYZ - LAS

Everything about the rescheduled (cost me $180) flight great. ***Being denied boarding because I was few minutes under 1.5 hours was not. Stuck at the Kiosk for about 15 minutes before it directed me to the Porter counter was strange. Do not know why checking in online at home was not successful? I think something was up...what can you do?
Air Canada
7.0
Good
9,127 reviews
Porter Airlines
8.0
Very good
281 reviews

Comfort

8.0

Overall

8.0

Boarding

8.2

Food

7.6

Crew

8.7

Entertainment

7.0

Reviews

1 / 17
10.0
Excellent

Anonymous,Dec 2024

YYZ - LAS

Everything about the rescheduled (cost me $180) flight great. ***Being denied boarding because I was few minutes under 1.5 hours was not. Stuck at the Kiosk for about 15 minutes before it directed me to the Porter counter was strange. Do not know why checking in online at home was not successful? I think something was up...what can you do?

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?

    Located just 6.6 mi from the city center, Ottawa (YOW) is the airport most travelers will use when flying to Illinois from Ottawa.

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

    To fly one-way, consider booking your trip with Porter Airlines, which is currently one of the cheapest options available, starting at $138. Air Canada flights start at $239 while deals on United Airlines start at $266 one-way.

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

    When deciding which route to take from Ottawa to Illinois consider Ottawa - Chicago O'Hare Intl, Ottawa - Chicago Midway or Ottawa - Lambert-St Louis as they are the most popular.

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

    The top 3 most reliable airlines when flying from Ottawa to Illinois are Avianca (84%), ANA (80%) and Republic Airways (79%).

  • What are the cheapest flights from Ottawa to Illinois?

    While on average a flight from Ottawa to Illinois is generally $450, our data shows the cheapest flight currently is $129. When looking at the most popular route, (Ottawa - Chicago O'Hare Intl), you can expect to pay $343 for that flight.

  • 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 $245). Flying from Ottawa to Illinois in March is currently the most expensive (average of $321). 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

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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 2,558,603 searches. Data last updated abril 15, 2025.
AirlineCheapestAverageFlexibilityOn-time
Porter AirlinesCheapest$291Average$433FlexibilityNo cancel feeOn-time52%
United AirlinesCheapest$410Average$606FlexibilityNo cancel feeOn-time69%
Air CanadaCheapest$423Average$554FlexibilityNo cancel feeOn-time67%

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