C$ 256 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 9/7. 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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Flights Deals

Best Illinois Flight Deals from Ottawa

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

Chicago
Chicago1 stopC$ 425
Chicago
Chicago1 stopC$ 425

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.
Porter Airlines Logo
12:35 p.m. - 4:54 p.m.YOW-MDW
5h 19m1 stop
Porter Airlines Logo
9:40 a.m. - 4:33 p.m.MDW-YOW
5h 53m1 stop
C$ 425Porter Airlines
Find Deal
Fri, 6 Jun - Sun, 22 Jun
Porter Airlines Logo
12:35 p.m. - 4:54 p.m.YOW-MDW
5h 19m1 stop
Porter Airlines Logo
9:40 a.m. - 4:33 p.m.MDW-YOW
5h 53m1 stop
C$ 435Porter Airlines
Find Deal
Fri, 30 May - Tue, 3 Jun
 Logo
11:15 a.m. - 8:07 p.m.YOW-ORD
9h 52m1 stop
 Logo
5:51 a.m. - 2:56 p.m.ORD-YOW
8h 05m1 stop
C$ 451
Find Deal
Wed, 28 May - Wed, 4 Jun
 Logo
5:55 a.m. - 4:54 p.m.YOW-MDW
11h 59m1 stop
 Logo
9:40 a.m. - 4:33 p.m.MDW-YOW
5h 53m1 stop
C$ 471
Find Deal
Wed, 28 May - Wed, 4 Jun
Air Canada Logo
5:25 p.m. - 6:53 p.m.YOW-ORD
2h 28mdirect
Air Canada Logo
6:15 p.m. - 9:35 p.m.ORD-YOW
2h 20mdirect
C$ 583Air Canada
Find Deal
Thu, 19 Jun - Mon, 23 Jun
Air Canada Logo
6:00 a.m. - 9:52 a.m.YOW-ORD
4h 52m1 stop
Air Canada Logo
6:15 p.m. - 9:35 p.m.ORD-YOW
2h 20mdirect
C$ 597Air Canada
Find Deal
Fri, 30 May - Sun, 1 Jun
United Airlines Logo
5:25 p.m. - 6:53 p.m.YOW-ORD
2h 28mdirect
United Airlines Logo
10:56 a.m. - 2:04 p.m.ORD-YOW
2h 08mdirect
C$ 660United Airlines
Find Deal
Fri, 13 Jun - Fri, 20 Jun
United Airlines Logo
6:40 a.m. - 8:02 a.m.YOW-ORD
2h 22mdirect
United Airlines Logo
6:15 p.m. - 9:35 p.m.ORD-YOW
2h 20mdirect
C$ 675United Airlines
Find Deal
Thu, 29 May - Sun, 1 Jun
WestJet Logo
5:55 a.m. - 10:41 p.m.YOW-ORD
17h 46m2 stops
WestJet Logo
1:40 p.m. - 5:25 a.m.ORD-YOW
14h 45m1 stop
C$ 770WestJet
Find Deal
Fri, 30 May - Sun, 29 Jun
WestJet Logo
5:15 p.m. - 4:44 p.m.YOW-ORD
24h 29m2 stops
WestJet Logo
5:30 p.m. - 6:45 a.m.ORD-YOW
12h 15m1 stop
C$ 807WestJet
Find Deal
Fri, 23 May - Sun, 25 May
Useful Info

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$ 338 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$ 338.

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 May, when tickets cost C$ 486 (return) on average. On the other hand, the most expensive months are November and October, when the average cost of round-trip tickets is C$ 675 and C$ 608 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 seasonFebruary
High seasonMay
Cheapest flightC$ 256
Best time to beat the crowds (6% less expensive on average)
Most popular time to fly and prices are also 17% 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.

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

    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 16% 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.

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$ 322 one-way - C$ 560 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.
8.0
Porter AirlinesOverall score based on 285 reviews
7.6Food
8.2Boarding
8.8Crew
7.0Entertainment
8.1Comfort
Airline reviews

I love the 2 seats per row. More room. The crew were excellent.

10.0 ExcellentAnonymous, Apr 2025YHZ - YOW
Read more Porter Airlines reviews

I love the 2 seats per row. More room. The crew were excellent.

It was amazing although they did bump us up to the front which gave us more leg room and a meal. The service was great! The staff were friendly. :)

Overall very good... staff were friendly and helpful. boarding was good for the most part, but a little hard to get our carry-on bags on there.... I think people should be directed to keep their coats and small bags with them until all the carry-ons are loaded, and then, if there is space, they can put their small bags and coats up top.. makes it much easier to put baggage up. i loved the internet feature, but the entertainment was not there unless you have your own Netflix or similar platform. My chair did not recline, which was very annoying, and the arms won't go up near the isle, which makes it tough to get in and out of the seat.

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.

So far so good but food and entertainment are not available for this flight

Smooth flight. Boarding was chaotic. Could not hear the gate agent over the intercom. People were lined up in the wrong lines. Groups one and two were told to board through line one and group 3 through line 2. All very confusing. Once in the air, the flight was smooth. There was no entertainment option on this aircraft, even though it was a larger aircraft.

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

They lost my checked in luggage, why do I pay for my cargo not arriving at the same destination as me?

Terrible. 3 missed flights and 24 hours delayed with lost bag and promised $100 compensation from United and absolutely nothing from them…

Poor planning meant the plane was delayed an hour, then a thunder storm started and the ground staff couldn't work. Eventual arrival in Santiago was 3 hours late resulting in missed connections and the need to buy new tickets.

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!

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

Information on your arrival and departure airports

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