$158 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.
1 adult
1 adult, Economy

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 stop$279
St. Louis
St. Louis2 stops$550
Chicago
Chicago1 stop$279
St. Louis
St. Louis2 stops$550

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

Tue, Aug 19 - Fri, Aug 22
Porter Airlines Logo
11:00 am - 4:24 pmYOW-MDW
6h 24m1 stop
Porter Airlines Logo
9:40 am - 5:03 pmMDW-YOW
6h 23m1 stop
$279Porter Airlines
Find Deal
Mon, Aug 18 - Mon, Aug 25
Porter Airlines Logo
11:00 am - 4:24 pmYOW-MDW
6h 24m1 stop
Porter Airlines Logo
9:40 am - 5:03 pmMDW-YOW
6h 23m1 stop
$280Porter Airlines
Find Deal
Fri, Sep 5 - Mon, Sep 8
United Airlines Logo
5:25 pm - 6:54 pmYOW-ORD
2h 29mnonstop
United Airlines Logo
1:55 pm - 5:06 pmORD-YOW
2h 11mnonstop
$318United Airlines
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Wed, Aug 27 - Fri, Sep 5
 Logo
5:55 am - 4:24 pmYOW-MDW
11h 29m1 stop
 Logo
9:15 am - 5:04 pmMDW-YOW
6h 49m1 stop
Thu, Aug 28 - Fri, Sep 5
 Logo
5:55 am - 4:24 pmYOW-MDW
11h 29m1 stop
 Logo
9:15 am - 5:04 pmMDW-YOW
6h 49m1 stop
Fri, Sep 19 - Mon, Sep 22
WestJet Logo
6:00 am - 4:43 pmYOW-ORD
11h 43m1 stop
WestJet Logo
5:30 pm - 2:46 pmORD-YOW
20h 16m1 stop
$321WestJet
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Fri, Sep 19 - Mon, Sep 22
WestJet Logo
6:00 am - 4:43 pmYOW-ORD
11h 43m1 stop
WestJet Logo
5:30 pm - 6:20 pmORD-YOW
23h 50m1 stop
$322WestJet
Find Deal
Fri, Sep 5 - Mon, Sep 8
United Airlines Logo
6:33 am - 8:00 amYOW-ORD
2h 27mnonstop
United Airlines Logo
9:31 pm - 9:58 amORD-YOW
11h 27m1 stop
$327United Airlines
Find Deal
Fri, Sep 5 - Mon, Sep 8
Air Canada Logo
6:00 am - 9:51 amYOW-ORD
4h 51m1 stop
Air Canada Logo
8:40 am - 1:51 pmORD-YOW
4h 11m1 stop
$328Air Canada
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Fri, Sep 19 - Sun, Sep 21
Air Canada Logo
6:00 am - 9:51 amYOW-ORD
4h 51m1 stop
Air Canada Logo
8:40 am - 1:51 pmORD-YOW
4h 11m1 stop
$329Air Canada
Find Deal
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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?

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 $306 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 $306.

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 $409, 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 $339 (return) on average. On the other hand, the most expensive months are November and June, when the average cost of round-trip tickets is $464 and $455 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 Sunday is the most expensive. Flying from Illinois back to Ottawa, the best deals are generally found on Thursday, with Tuesday being the most expensive.

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 seasonAugust
Cheapest flight$158
Best time to beat the crowds with an average 4% drop in price.
Most popular time to fly with an average 8% increase in price.
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 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.

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

    The cheapest time of day to fly to Illinois is generally at night, when round-trip flights cost $353 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 $653.

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 $220 one-way - $391 round-trip

Reviews of the 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 303 reviews
7.7Food
8.1Comfort
8.2Boarding
7.1Entertainment
8.7Crew
Airline reviews

Just an evening before they canceled my ticket and offered me ticket costing 3 x times more than. I will not fall prey to these scams,Will never book through kayak now. Such a bad experience.

2.0 MediocreAnonymous, Jul 2025YTZ - EWR
Read more Porter Airlines reviews

Just an evening before they canceled my ticket and offered me ticket costing 3 x times more than. I will not fall prey to these scams,Will never book through kayak now. Such a bad experience.

was okay except.. 1)the porter check in webpage doesn't let you print your boarding pass from home 2)that there was a 90 min cut off for checking in on the kiosk in general, and to print a boarding pass, even tho i checked in online already....

Great! Personable crew. I love that they pour complimentary beer and wine.

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.

Overall it was good. I missed my connection but I was put on another flight.

Overall a very poor experience - booked premium economy tickets but due to last minute flight delays , all my itinery went for a toss and had to fly economy class with no access to lounge or any compensation by united airlines to make up for the flight delays . i had expected better experience than that from united.

It was all good flight was on time, service was good I enjoyed a few movies and everything was smooth

It was fine, definitely older planes with no charging or anything. There’s no entertainment set up on board, but it is nice that they allow you to access the in flight entertainment from your phone without having to pay for the Wi-Fi and they do offer free texting.

I liked that the flight was nonstop from ORD to CIU for $200 round trip.

The schedule to Moline changed 5 times. The gate changed 6 times. That is a pathetic way to run an airline. No wonder that no one in our company flies on United Express to or from Moline. Changes happen most of the time. I learned my lesson on this trip…never again!

All flight attendants could benefit by taking an international flight on Qantas Airline. Qantas attendants are much more hospitable in every way. Much superior than and attendants on any US airline.

While the staff was pleasant and helpful, the following observations are for your awareness. There was some delay on the tarmac on take off and landing. The paid lunch/food offerings were limited. Entertainment was only available on WiFi at a cost.

The first flight was better in terms of the aircraft.

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

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…

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

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

Information on your arrival and departure airports

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