$187 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 6/7. 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.
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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Cheap Flights from Ottawa to Illinois

Cheapest round-trip prices found by our users on KAYAK in the last 72 hours
Chicago
Chicago2 stops$353
Bloomington
Bloomington2 stops$414
St. Louis
St. Louis1 stop$314
Chicago
Chicago2 stops$353
Bloomington
Bloomington2 stops$414
St. Louis
St. Louis1 stop$314

Book Cheap Ottawa to Illinois Plane Tickets

 
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

Sat, May 23 - Sun, May 24
Air Canada Logo
2:40 pm - 8:25 pm
YOW
-
STL
6h 45m
1 stop
Air Canada Logo
7:05 am - 1:05 pm
STL
-
YOW
5h 00m
1 stop
$314Air Canada
Sat, May 23 - Wed, May 27
United Airlines Logo
5:50 pm - 11:35 pm
YOW
-
STL
6h 45m
1 stop
United Airlines Logo
6:00 am - 4:38 pm
STL
-
YOW
9h 38m
1 stop
$320United Airlines
Tue, Jun 2 - Wed, Jun 3
United Airlines Logo
10:44 am - 9:16 pm
YOW
-
STL
11h 32m
1 stop
United Airlines Logo
6:00 am - 4:38 pm
STL
-
YOW
9h 38m
1 stop
$321United Airlines
Fri, Jun 12 - Fri, Jun 19
Air Canada Logo
7:00 am - 12:06 pm
YOW
-
STL
6h 06m
1 stop
Air Canada Logo
2:15 pm - 9:15 pm
STL
-
YOW
6h 00m
1 stop
$328Air Canada
Tue, May 19 - Tue, May 26
Multiple Airlines Logo
7:00 am - 11:13 pm
YOW
-
ORD
17h 13m
2 stops
Multiple Airlines Logo
5:30 pm - 6:00 pm
ORD
-
YOW
23h 30m
1 stop
$353Multiple Airlines
Mon, May 25 - Mon, Jun 1
Multiple Airlines Logo
10:10 am - 11:09 am
YOW
-
MDW
49h 59m
2 stops
Multiple Airlines Logo
10:15 am - 3:59 pm
MDW
-
YOW
4h 44m
1 stop
$377Multiple Airlines
Sat, May 23 - Wed, May 27
United Airlines Logo
2:52 pm - 9:23 pm
YOW
-
STL
7h 31m
2 stops
United Airlines Logo
6:00 am - 5:11 pm
STL
-
YOW
10h 11m
2 stops
$382United Airlines
Fri, Jun 12 - Fri, Jun 19
Porter Airlines Logo
8:00 am - 2:35 pm
YOW
-
MDW
7h 35m
1 stop
Porter Airlines Logo
3:20 pm - 8:04 pm
MDW
-
YOW
3h 44m
1 stop
$400Porter Airlines
Tue, Jun 2 - Wed, Jun 3
Delta Logo
6:55 am - 1:10 pm
YOW
-
STL
7h 15m
2 stops
Delta Logo
1:27 pm - 12:20 am
STL
-
YOW
9h 53m
2 stops
$406Delta
Sat, May 30 - Mon, Jun 1
Porter Airlines Logo
9:35 am - 9:45 am
YOW
-
MDW
25h 10m
1 stop
Porter Airlines Logo
10:15 am - 2:54 pm
MDW
-
YOW
3h 39m
1 stop
$416Porter 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.

How much is a round-trip flight from Ottawa to Illinois?

This analysis is based on the cheapest round-trip price found on KAYAK in the last 12 months by searching for a flight from Ottawa to Illinois departing in May.

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 $253 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 $253.

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 evening, when round-trip flights cost $517 on average. Morning departures are around 21% 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 $626.

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.

Yes, flying with a layover may cost you more time, but you can also save money on the route, with a 1 stop layover the cheapest option at $434 on average.

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 August, when tickets cost $131 (return) on average. On the other hand, the most expensive months are January and November, when the average cost of round-trip tickets is $539 and $355 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.

For Ottawa to Illinois, Saturday is the cheapest day to fly on average and Monday is the most expensive. Flying from Illinois back to Ottawa, the best deals are generally found on Saturday, with Monday being the most expensive.

Good to know

Low seasonJanuary
Cheapest flight$187
Best time to beat the crowds but there is an average 25% increase in price.
Most popular time to fly with an average 7% increase in price.
Flight from Ottawa to St. Louis

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 travelers 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.

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 $252 one-way - $409 round-trip

Reviews of the top 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 435 reviews
7.6Food
8.2Boarding
8.6Crew
8.0Comfort
7.0Entertainment
Airline reviews

I didn’t receive any help when they messed up and wasn’t honest and the supervisor did absolutely nothing to help me so I had to buy another ticket at $537

10.0 ExcellentAnonymous, Apr 2026
YHM - YHZ
Read more Porter Airlines reviews

I didn’t receive any help when they messed up and wasn’t honest and the supervisor did absolutely nothing to help me so I had to buy another ticket at $537

Even tho the flight was a bit delayed the team was apologetic. Everyone was friendly and efficient.

The Flight took off 2hrs late because there was no pilot showing up when the flight was ready to board.. Though the cabin crew was present and had prepared the plane, the FO turned around after 15 min and went away. A crew to fly the plane finally arrived over an hour later and we were able to board 1h30 min later than planned time... until everything was loaded, we left 2h late from the gate. This was a small plane, so don't expect any Entertainment... Wi-Fi access on board would work, but took an awful amount of time to figure out and get it work (I'm an IT person). Flying as VIPorter customer, I was expecting at least some warm meal, but everything served was just cold.. except the coffee maybe. Even in so-called VIPorter seats, space is cramped and trays are so tiny, you can barely setup your food. Flight caught up during the coast-to-coast crossing and was able to recoup about 45 min from the delay.. still arrived very late in Vancouver and had to wait a long time to get our registered bags. Let's see how the return flight will be in a few days..

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.

Flight crew was super friendly and helpful. Food was frequent and honestly pretty good. Plenty of on-board entertainment. Economy seats are super cramped for such a long flight, but the crew allowed people to get up and stretch, and kids could wander with their parents, so we all made it work. Overall a very good experience.

Standard flight with a drinks and a snack- overall very quick flight. The flight attendants were very strict, bordered on rude.

Starlink is great Crew was polite Business class didn’t get a welcome drink just water and snacks were ok

Delayed - weather wasn't bad at either end. Also sat on tarmac in ORD.

very average service no complimentary alcoholics drinks unlike other airlines such as Porter airlines No decent seats available during check-in time the day before

boarded early to only find out that flight would sit at gate for 45 min to an hour. Landed in chicago and sat on runway for over an hour before got to gate. Total delay was extensive for a 45 min flight door to door.

The flight was significantly delayed. The inbound flight from EWR was delayed departing because of mechanical problems. My original departure from CLT was 5:28 pm but due to the delay of the inbound flight, after arrival, deplaning, cleaning, boarding, we did not push back from the gate until 9:00 pm. Once in the air, the flight was smooth and what was originally supposed to be an arrival in ORD at 7:30 pm local time turned out to be 9:35 pm.

The flight I was supposed to be on was supposed to take off at 1:50 from State College. It was delayed over and over and over again until somehow I had to rebook on a flight that was supposed to have left State College at 8 am that morning but didn't end up taking off until almost 6 pm. Not only was this completely unacceptable, the "token from United" was a 15 dollar meal voucher that has to be used by today. I would personally like some miles added to my account for this inconvenience. I was in transit for 8 hours from the time I arrive at State College Aiport to when I got home. I was supposed to be home at 3 pm and I returned at 8 pm. Unacceptable. I have not been on an on Time united flight in nearly 5 years.

newer aircraft, ability to connect my headset via blue tooth for entertainment.

Very comfortable flight, snacks and drinks were good, good communication from crew. Could have used a little more information on timing of boarding for group 5

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

Information on your arrival and departure airports