C$ 249 Find Cheap Flights from Ottawa to Illinois

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Ottawa to Illinois departing on 7/5. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
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KAYAK searches hundreds of travel sites at once for deals on flights to Illinois

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Ottawa to Illinois, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Ottawa to Illinois, as well as popular online travel agencies
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Best Illinois Flight Deals from Ottawa

Cheapest round-trip prices found by our users on KAYAK in the last 72 hours

Chicago
Chicago1 stopC$ 373

Cheap Flight Deals from Ottawa to Illinois (YOW-USIL)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Ottawa to Illinois that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.

Recent round-trip flight deals from Ottawa to Illinois

Recommended round-trip deals departing in the coming months from the most popular airlines that fly from Ottawa to Illinois.
Discover the best prices for you by selecting your travel dates on KAYAK.
Choose your dates
9:20 a.m. - 12:00 p.m.YOW-MDW
3h 40m1 stop
11:15 a.m. - 5:09 p.m.MDW-YOW
4h 54m1 stop
C$ 373Porter Airlines
Find Deal
Sat, 19 Apr - Tue, 22 Apr
12:35 p.m. - 4:24 p.m.YOW-MDW
4h 49m1 stop
9:40 a.m. - 4:33 p.m.MDW-YOW
5h 53m1 stop
C$ 425Porter Airlines
Find Deal
Thu, 1 May - Mon, 5 May
7:00 a.m. - 6:17 p.m.YOW-ORD
12h 17m2 stops
5:55 a.m. - 3:05 p.m.ORD-YOW
32h 10m3 stops
C$ 503
Find Deal
Tue, 29 Apr - Sun, 4 May
7:00 a.m. - 6:17 p.m.YOW-ORD
12h 17m2 stops
5:55 a.m. - 6:56 p.m.ORD-YOW
12h 01m1 stop
C$ 505
Find Deal
Tue, 29 Apr - Sun, 4 May
5:25 p.m. - 6:54 p.m.YOW-ORD
2h 29mdirect
6:19 p.m. - 9:35 p.m.ORD-YOW
2h 16mdirect
C$ 592Air Canada
Find Deal
Thu, 1 May - Mon, 5 May
10:00 a.m. - 3:05 p.m.YOW-ORD
6h 05m1 stop
8:40 a.m. - 1:45 p.m.ORD-YOW
4h 05m1 stop
C$ 604Air Canada
Find Deal
Fri, 9 May - Fri, 16 May
5:25 p.m. - 6:54 p.m.YOW-ORD
2h 29mdirect
9:00 a.m. - 2:27 p.m.ORD-YOW
4h 27m1 stop
C$ 631United Airlines
Find Deal
Tue, 29 Apr - Sun, 4 May
5:25 p.m. - 6:54 p.m.YOW-ORD
2h 29mdirect
6:19 p.m. - 9:35 p.m.ORD-YOW
2h 16mdirect
C$ 634United Airlines
Find Deal
Thu, 1 May - Mon, 5 May
5:55 a.m. - 4:10 p.m.YOW-ORD
11h 15m2 stops
6:24 a.m. - 12:22 a.m.ORD-YOW
16h 58m2 stops
C$ 654WestJet
Find Deal
Sun, 4 May - Sun, 11 May
5:55 a.m. - 10:32 a.m.YOW-ORD
29h 37m2 stops
2:45 p.m. - 12:09 a.m.ORD-YOW
8h 24m2 stops
C$ 687WestJet
Find Deal
Sat, 19 Apr - Tue, 22 Apr

KAYAK's insights & trends for Ottawa to Illinois flights

Get data-powered insights and trends into flights from Ottawa to Illinois to help you find the cheapest flights, the best time to fly and much more.

What is the cheapest Ottawa to Illinois flight route?

The cheapest price for flight routes found by users searching on KAYAK in the last 2 weeks for round-trip flights from Ottawa to Illinois.
The cheapest ticket to Illinois from Ottawa found in the last 72 hours was to Chicago, at C$ 395 round-trip. The most popular route is from Ottawa (YOW) to Chicago O'Hare Intl Airport (ORD), and the cheapest round-trip airline ticket found on this route in the last 72 hours was C$ 395.

What is the cheapest time of day to fly to Illinois?

The average price for all round-trip flights from Ottawa to Illinois depending on the time of departure, clicked by users on KAYAK in the last 2 weeks.
The cheapest time of day to fly to Illinois is generally in the afternoon, when round-trip flights cost C$ 366 on average. Morning departures are around 15% more expensive than evening flights, on average. The most expensive time of day to fly to Illinois is generally in the morning, which is peak travel time and where the average cost of a ticket is C$ 669.

What is the cheapest month to fly from Ottawa to Illinois?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Ottawa to Illinois, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.
The cheapest month for flights from Ottawa to Illinois is April, when tickets cost C$ 506 (return) on average. On the other hand, the most expensive months are November and August, when the average cost of round-trip tickets is C$ 698 and C$ 635 respectively.

What’s the cheapest day of the week to fly from Ottawa to Illinois?

The average price of all round-trip flights from Ottawa to Illinois clicked on KAYAK for each day over the last 12 months.
When flying from Ottawa to Illinois, you should consider leaving on a Tuesday and avoid Mondays if you are looking for the best rates. For your return to Ottawa, you’ll find the best rates on Thursdays and the most expensive ones on Sundays.

How far in advance should I book a flight from Ottawa to Illinois?

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights from Ottawa to Illinois, removes the top 0.1% to account for outliers, and then takes the average of all the values for each week.
To get a below-average price on the flight from Ottawa to Illinois, you should book around 4 weeks before departure. For the absolute cheapest price, our data suggests you should book 12 weeks before departure.

Good to know

Low season

February

High season

May

Cheapest flight

C$ 249
Best time to beat the crowds (6% less expensive on average)
Most popular time to fly and prices are also 15% lower on average.
Flight from Ottawa to Chicago Midway Airport

FAQs - booking Illinois flights

  • How does KAYAK find such low prices on flights from Ottawa to Illinois?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Ottawa to Illinois.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Ottawa to Illinois?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight from Ottawa to Illinois is likely to change within 7 days, so travellers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Ottawa to Illinois?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly from Ottawa to Illinois with an airline and back with another airline.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Ottawa to Illinois?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying from Ottawa to Illinois up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

See more FAQs

Top tips for finding cheap flights to Illinois

  • Looking for a cheap flight? 25% of our users found tickets from Ottawa to the following destinations at these prices or less: Chicago C$ 350 one-way - C$ 607 round-trip

Top 3 airlines serving from Ottawa to Illinois

 
See real verified KAYAK customer reviews for airlines flying from Ottawa to Illinois. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from Ottawa to Illinois? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
7.9
Porter AirlinesOverall score based on 276 reviews
6.9Entertainment
8.7Crew
8.0Comfort
7.6Food
8.2Boarding
Airline reviews

Staff were excellant. Only snacks served. Some turbulence so we were offered Free beer or wine.

8.0 ExcellentLouise, Mar 2025YYZ - YOW
Read more Porter Airlines reviews

Staff were excellant. Only snacks served. Some turbulence so we were offered Free beer or wine.

The staff is always great. Just the fact that our flight was the only one delayed from Halifax when all other carries were still flying. It happen a year ago out of Toronto as well. All others were flying but our flight got cancelled 1 hr before the time of departure.

The only issue had when i mentioned about comfort was the man beside me was on the larger side and took about 1/3 of my seat where i was pressed against the wall/window of the plane for the trip.

The check-in staff, boarding staff, and flight crew were all very friendly. Really miss the Porter lounge in Ottawa.

Thanks for giving a beer to everyone in the seat infront of me and then telling me that I can’t have one because they are going to land. I guess I need to pay for a seat and then pick one in the very front of the plane

The flight was delayed by more than one hour. The terminal was consequently overcrowded and hot. We lost our car reservation and hit rush hour traffic in Boston, which added two hours stuck in traffic to our trip.

Awesome, the whole way through. Thank you, this is the new Canadian Airline benchmark.

We were given a complimentary seat upgrade which was so unexpected but so lovely!

Porter was excellent. Boarding was a breeze. The seats were a little uncomfortably but the overall trip was excellent.

Only packaged snacks were served. It was a flight at lunchtime and a hot meal would have been a great.

We tried to upgrade to economy premium but were told this was not possible as we had booked through United Airlines (and Air Canada was operating the flight). This seemed silly given there was ample space in economy premium. Additionally, we had to wait almost 1.5 hours upon arrival to taxi to the gate. Otherwise, the crew were very pleasant and passengers were friendly.

Overall poor for me I paid extra for seats with leg room and my regional flights exit row seats have less leg room then the others that's money that could have been saved and on my final flight home the flights air was not operating it was unbearably hot in the cabin I will be contacting United and filing a DOT complaint

It was my first time with United Airlines and I would say it was very good experience and best of all the flights were on time. Will definitely fly with United Airlines next time.

headphone jack didnt work for the first flight and not much variety

Very modern plane. Good seat spacing. Meals were good. Screens had tons of movies and worked

There's just no way to sit fully upright and comfortably in these seats. There needs to be 2 more inches of room, and that's not something that only one person on the flight needs - the whole flight needs 2 more inches of room. If that means you sell 6 less seats, so be it. It's too close for anyone. Forcing people to pay for "premium" economy just to get "barely enough space to breathe" isn't really an answer to that.

The crew were very nice. The Chocolate is good and v there’s no entertainment. Thanks

The crew were very nice. I would have appreciated a pillow for comfort. I had a special meal that was sloppy, but the salad was great. Thanks

The plane was in Moline all night. Consequently, we assumed an on time departure at 8:15am. Unfortunately, and as is the normal case with United in Moline, we departed 2.5 hours late. When the crew came, it was discovered that there was very little heat in the plane. Seems this should have been checked hours before the crew arrived. Then when we boarded and the plane was to be de-iced, the United de-icing truck was not working! We awaited the American Airlines truck. All of this caused us to miss our connection in Chicago. My suggestion is never take United Airlines flight from Moline. We have been disappointed 80% of the time and have vowed to not take United again from Moline.

Flight was delayed two hours. No snacks and no tv screens. My bag got stuck in Chicago

The take off was delayed as we were told that the baggages had to be rearranged to balance the weight. I only took a carry-on and a personal item, but the overhead bin was extremely small, even a normal size carryon can’t fit it, so they had to check it in for free. The seat was really tight and no entertainment at all.

flight was delayed 6 hours for weather, then cancelled because of the crash in toronto, but none of the links to cancel or rebook my flights are working

The pork noodles were disgusting. The tuna sandwich had hardly any tuna and the bread was stale. A salad would have been better. An apple or a muffin.

Air Canada is the worst but the only option for my route

Minimal food offered (crackers). Had to clean the seat with a wet wipe because of dried food.

They charge 5 dollars for plastic headphones for a flight of 1 hour! Seats are awful. Service is terrible.

Everything was seamless. I would have appreciated knowing there would not be any real food available for purchase in advance. Otherwise a great experience. Thank you!

5-hour trip with just water and one cookie is not great: fruits and cheese,, salads, protein smoothie... It could be small but nourrishing No screen and no outlet to connect our electronic devices. If there were ,It would have been nice to be informed. Every instruction given in french by the agent on the plane was pronounced so quickly that despite french is my 1st language, I could not understand the instructions. Too fast, no intonation, no space between words. Most of the time, the english versions (my 2nd language) were fast but with breathing between words, good intonation and the information was much easier to understand.

I was mostly pleased. My greatest disappointment was with respect to the timely update to the estimated departure and arrival times. It was especially sad that the arrival time was not updated online once we were in flight so as to allow my wife to arrive on time to the airport. She was not happy.

The Flight Attendant was particularly helpful to my wife, who was having a bad day.

Everything you need to know for your flight from Ottawa to Illinois

Information on your arrival and departure airports

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