C$ 235 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 14/1. 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.
1 adult
1 adult, Economy, 0 bags

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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Flight 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$ 335
Champaign
Champaign2 stopsC$ 617
Chicago
Chicago1 stopC$ 335
Champaign
Champaign2 stopsC$ 617

Cheap Flights from Ottawa to Illinois

 
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.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Ottawa to Illinois

Thu, 5 Feb - Sun, 8 Feb
Multiple Airlines Logo
4:20 p.m. - 10:35 a.m.
YOW
-
ORD
19h 15m1 stop
Multiple Airlines Logo
3:00 p.m. - 5:25 p.m.
ORD
-
YOW
25h 25m1 stop
C$ 335Multiple Airlines
Thu, 5 Feb - Mon, 9 Feb
Multiple Airlines Logo
7:00 a.m. - 10:36 p.m.
YOW
-
ORD
16h 36m1 stop
Multiple Airlines Logo
7:20 a.m. - 5:25 p.m.
ORD
-
YOW
9h 05m1 stop
C$ 336Multiple Airlines
Thu, 5 Feb - Sun, 8 Feb
Multiple Airlines Logo
7:00 a.m. - 10:36 p.m.
YOW
-
ORD
16h 36m1 stop
Multiple Airlines Logo
3:00 p.m. - 5:25 p.m.
ORD
-
YOW
25h 25m1 stop
C$ 337Multiple Airlines
Sat, 11 Apr - Sun, 12 Apr
United Airlines Logo
5:20 p.m. - 9:08 p.m.
YOW
-
STL
4h 48m1 stop
United Airlines Logo
7:45 a.m. - 1:59 p.m.
STL
-
YOW
5h 14m1 stop
C$ 406United Airlines
Fri, 6 Feb - Tue, 10 Feb
Porter Airlines Logo
7:00 a.m. - 10:05 a.m.
YOW
-
MDW
4h 05m1 stop
Porter Airlines Logo
11:05 a.m. - 7:59 a.m.
MDW
-
YOW
19h 54m1 stop
C$ 454Porter Airlines
Mon, 19 Jan - Sat, 24 Jan
Air Canada Logo
10:20 a.m. - 3:29 p.m.
YOW
-
STL
6h 09m1 stop
Air Canada Logo
4:05 p.m. - 1:38 a.m.
STL
-
YOW
8h 33m1 stop
C$ 472Air Canada
Mon, 2 Mar - Mon, 9 Mar
United Airlines Logo
5:48 p.m. - 12:05 a.m.
YOW
-
STL
7h 17m1 stop
United Airlines Logo
7:00 p.m. - 2:30 p.m.
STL
-
YOW
18h 30m2 stops
C$ 480United Airlines
Mon, 19 Jan - Sat, 24 Jan
Air Canada Logo
10:20 a.m. - 3:29 p.m.
YOW
-
STL
6h 09m1 stop
Air Canada Logo
9:57 a.m. - 9:56 p.m.
STL
-
YOW
10h 59m2 stops
C$ 483Air Canada
Thu, 19 Feb - Sun, 22 Feb
American Airlines Logo
6:40 a.m. - 3:17 p.m.
YOW
-
CMI
9h 37m2 stops
American Airlines Logo
3:47 p.m. - 12:43 a.m.
CMI
-
YOW
7h 56m2 stops
C$ 617American Airlines
Sat, 11 Apr - Sun, 12 Apr
American Airlines Logo
10:00 a.m. - 6:27 p.m.
YOW
-
STL
9h 27m2 stops
American Airlines Logo
7:05 a.m. - 4:51 p.m.
STL
-
YOW
8h 46m2 stops
C$ 639American Airlines
Booking Insights

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?

Data is based on round-trip flight searches on KAYAK over the past month.

The cheapest ticket to Illinois from Ottawa found in the last 72 hours was to Chicago, at C$ 399 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$ 399.

Can I save money by flying with a layover from Ottawa to Illinois?

The average round-trip price for all non-stop flights, flights with one layover, and flights with two layovers for the route found by users searching on KAYAK in the last 2 weeks.

No, with an average price for the route of C$ 846, prices are generally cheapest when you fly direct.

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$ 435 (return) on average. On the other hand, the most expensive months are January and November, when the average cost of round-trip tickets is C$ 847 and C$ 756 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 Saturday 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.

Good to know

Low seasonJanuary
Cheapest flightC$ 230
Best time to beat the crowds but there is an average 42% increase in price.
Most popular time to fly and prices are also 5% lower on average.
Flight from Ottawa to Chicago O'Hare 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 evening, when round-trip flights cost C$ 707 on average. Morning departures are around 19% 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$ 843.

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$ 247 one-way - C$ 520 round-trip

Reviews of the top 3 airlines flying 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 405 reviews
7.0Entertainment
8.6Crew
8.2Boarding
7.6Food
8.0Comfort
Airline reviews

It was okay. Had a thing with the front desk, she had me repack my suitcases to have them be under the weight restrictions, but then the other one was overweight, she argued with me about it when there were tons of people in line. Wasn’t great.

6.0 GoodJen, Jan 2026
YTZ - BOS
Read more Porter Airlines reviews

It was okay. Had a thing with the front desk, she had me repack my suitcases to have them be under the weight restrictions, but then the other one was overweight, she argued with me about it when there were tons of people in line. Wasn’t great.

Due to a known technical error that Porter has not fixed in over a year, I was unable to check in the children on my reservation online and had to do it at the airport. Upon check in, there were no seats together, which was an issue as we had young children. The gate agent did manage to seat us together by moving other passengers, which was appreciated, but the other passengers were never informed, leading to confusion and delay upon boarding. The flight was over an hour late; no explanation or apology was ever issued. The bags on Porter take a long time to arrive--over half an hour at Hamilton on my inbound flight, and not much better on my return to Edmonton.

On my e-boarding pass it shows free wifi, yet the plane I was on didn’t have wifi. Please remove false advertising from your website and boarding passes

3.5 hr delay for a 1 hr work flight. No information as to why the delay until 20 mins before boarding.

Organization and the adjusted times but the snacks could be of a bigger portion

Smaller plane. Food and bar service for free is amazing. Drinks were in glass not plastic cups.

Poor landing as we overshot the runway and had to re land the plane. Lost both of my luggage not found as of yet. Had to pay extra money for my luggage in USD, now great my luggage is gone. Will not fly with Porter again.

This flight to St. Johns was really good. Boarding was a breeze. We left spot on time. Seats were actually pretty good. Recliner further than I expected. Three more flights to go we will see if this is the status quo for Porter.👍

I was not happy with AirfareAssist, the agency that kayak advised me would be handling my booking. I was advised by porter airlines that I had been overcharged for the Basic express , a option that I had asked airfare assist to help arrange after I realized that the basic fare I had chosen with porter did not include a carryon. At each checkin porter advised I had been overcharged for this . They advised that money would be refunded to my credit card, however, this is not likely to happen as it is not my name and credit card that appeared on the porter invoice, but that of another individual/agent. When airfare assist was arranging the basic express with porter on my behalf, they asked me to confirm that I agreed to pay $263 USD for this. I did agree, as I was advised this was needed to proceed. When I checked the invoice on the porter website and saw that it was not my name and credit card on the invoice, I was advised that this was how airfareassist processed the payment. The Porter invoice indicated a billed amount of $126USD I will not use Kayak or their designated AirfareAssist again

Our flight was delayed by a bit. I appreciated that we were kept informed on why periodically. Boarding was fine. I overheard one flight attendant sounding very rude to a passenger who was not paying attention to the safety demonstration. The snacks were minimal as it was a short flight. There was no entertainment. Overall the flight was good back to LGA.

Perfect flight. Smooth flight. Arrived 20 minutes early at destination. Excellent service.

The flights were on time which was great give. It was holiday travel season and there’d been some weather issues. The only complaint and this is every time with United is the terrible seat design. The head rest is not built for comfort and having my neck bent forward for a cross country trip reminded me while I try not to take United flights as a rule.

Everything was absolutely wonderful from check in to baggage claim. Staff was very professional and sweet. Will definitely recommend United to family and friends.

The staff was nice, however boarding taking 2 hours. That’s insane. Overall very bad experience, a lot of turbulence and when landed in Chicago was horrible. I don’t think I’ll flight with UA again.

An international flight on an apron is pretty unusual in my 40 years of traveling. Departure delay. Luggage despite over an hour connection did not make it to the flight. Actually still in Germany. My luggage was not moved until I reached my final destination despite knowing it to be left in Germany upon my arrival in Chicago. The service left me a little off, both going and returning from Europe. Light on in the cabin even during a night flight and lots of traffic no matter what. Maybe passengers want more service? As a frequent traveler i just want to be able to sleep, the food will be better at the destination anyway. So since the cabin crew woke me up I asked for a cocktail, I did not get the best response although sitting in row 20 premium economy. I usually fly premium economy or business and my 2 flight to Europe in 2025 with United both had luggage delays and other minor issues. American flights to Australia, Canada and Europe went smoothly and Premium plus feels very much like business light. Is United Club becoming a waste and Silver/Gold levels another waste??

They did the one thing that really matters - got to Chicago early.

The flight was on time. I generally don’t drink or eat on short flights and the seats were good and the flight attendants were friendly. That’s all I expect

It was nice to have gotten up upgraded to first class with a meal on a three hour flight

Very bad! They kept delaying my flight and wouldn’t do anything about it

Quick and seamless boarding. No entertainment but fast Starlink wifi for this short trip and the staff was really friendly.

We were happy with the service and cost of checking a bag

It's kindof ridiculous that your system is even asking me about this since my flight was canceled and I wasn't rescheduled.

Flying with Air Canada is still better than the discount airlines like Flair. The seats are more comfortable and the on-board entertainment is better, with each seat having a built in screen and lots of content to watch. Onboard WIFI is also great to have, as well as plugs for charging. I think passengers in general are getting better at not bringing too much luggage onboard, and Air Canada is better at managing this without customers feeling like they are being taken advantage of with extra fees. I have travelled on different airlines and all seem to be loading faster, with fewer people bringing both a carry on and a personal item. Now I just bring one item and it fits under the seat so I don't need to worry about finding a place in the overhead bins. Overall, across the industry, asking customers to pay for carry on baggage is fair because it allows customers to only pay for what they need, and it helps to keep the planes on time. Kudos to Air Canada for its approach - the desired result is achieved without customers feeling that they are being surprised and caught with unexpected extra fees.

Due to the strike by AC flight attendants, my flight was cancelled. Very disappointing! A refund is being processed. This was not a Kayak issue. I will be sure to come back to Kayak in the future.

Bad service as well. Another 3hr delayed flight from chicago to Charlotte.

Staff was very courteous and kept things organized. We will definitely use Air Canada for further travel

Great flights. 90 minute departure delay for maintenance issues, not a great start but, afer that very good. Didn't pay extra for seats and lucked into a window and an aisle seat. Price was excellent at the super low economy level.

Just a little improvement on food but everything is excellent

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…

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

Information on your arrival and departure airports