$156 Find Cheap Flights from Ontario to Missouri

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Low seasonJune
High seasonDecember
Cheapest flight$156
Best time to beat the crowds with an average 11% drop in price.
Most popular time to fly with an average 8% increase in price.
Flight from Toronto to St. Louis

FAQs for booking flights from Ontario to Missouri

  • How does KAYAK find such low prices on flights from Ontario to Missouri?

    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 Ontario to Missouri.

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

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight from Ontario to Missouri 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 Ontario to Missouri?

    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 Ontario to Missouri 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 Ontario to Missouri?

    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 Ontario to Missouri up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

  • Which is the cheapest airport to fly into in Missouri?

    Prices will differ depending on the departure airport, but generally, the cheapest airport to fly to in Missouri is Lambert-St Louis Airport (STL), with an average flight price of $385.

  • What is the cheapest day to fly to Missouri?

    Based on KAYAK data, the cheapest day to fly to Missouri is Saturday where round-trip tickets can be as cheap as $324. On the other hand, the most expensive day to fly is Sunday, where round-trip prices are $541 on average.

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

    The cheapest time of day to fly to Missouri is generally in the morning, when round-trip flights cost $326 on average. Morning departures are around 23% cheaper than evening flights, on average. The most expensive time of day to fly to Missouri is generally in the afternoon, which is peak travel time and where the average cost of a ticket is $488.

  • What is the cheapest flight to Missouri?

    The cheapest ticket to Missouri from Ontario found in the last 72 hours was to St. Louis, at $187 round-trip. The most popular route is Toronto Pearson Intl Airport (YYZ) to St. Louis (STL) and the cheapest round-trip airline ticket found on this route in the last 72 hours was $187.

  • What is the cheapest month to fly from Ontario to Missouri?

    The cheapest month for flights from Ontario to Missouri is April, when tickets cost $310 (return) on average. On the other hand, the most expensive months are October and November, when the average cost of round-trip tickets is $910 and $894 respectively.

  • How far in advance should I book a flight from Ontario to Missouri?

    To get a below average price on the flight from Ontario to Missouri, you should book around 4 weeks before departure. For the absolute cheapest price, our data suggests you should book 19 weeks before departure.

  • How long is the flight to Missouri?

    An average nonstop flight from Ontario to Missouri takes 8h 04m, covering a distance of 910 miles. The shortest route is Toronto Pearson Intl Airport (YYZ) to St. Louis (STL) with an average flight time of 2h 03m.

  • What are the most popular destinations in Missouri?

    Based on KAYAK flight searches, the most popular destination is St. Louis (59% of total searches to Missouri). The next most popular destinations are Kansas City (32%) and Springfield (9%). Searches for flights to Joplin (1%) are also popular.

Reviews of the top 4 airlines serving from Ontario to Missouri

 
Need help choosing which airline to fly with from Ontario to Missouri? 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
DeltaOverall score based on 7964 reviews
7.3Food
8.5Crew
7.9Comfort
8.2Boarding
7.9Entertainment
Airline reviews

I like for how they process during check in. It was very smoothly.

10.0 ExcellentAbdulla, Jun 2025CMH - JFK
Read more Delta reviews

I like for how they process during check in. It was very smoothly.

The flight was scheduled for 2:30 PM. Early in the morning we got a text message saying the flight was delayed and rescheduled for 3:00 PM. We got to the airport with that in mind. Then we got a message during check-in at the flight was rescheduled again for 2:30 PM. We almost missed our flight. In fact, our bags Were told that they would not make it. At the end, everything worked out. But it is very stressful.

Most aspects were good however if they assign boarding zones they ought to enforce them or why bother? My luggage from SAN-JFK-MAD was lost in NY so I without my main bag for two days upon arrival in Spain. They were helpful in tracking it and eventually delivered it to my hotel. The flub was because of a delay upon arrival in NYC. I had booked 2 1/2 hours between flights but we had to hold on the taxiway for an hour after landing while waiting for a clear gate which likely caused the baggage error.

Excellent check-in. Crew was good. Excellent communication from flight deck.

Great overall. There was a bit of turbulence so they could only serve water because too much turbulence for the carts. Was glad they prioritized safety though

Excellent flight, the planes were newer, they did a nice job with boarding, great service overall.

Great service. Flight was delayed while we sat on the runway for a couple of hours. Weather related. Staff made is very bearable. The steward servicing the first class cabin was exceptional. Thank you! 💗

5 hours of delay that could've been much shorter if Delta had taken the 1 hour delay they imposed on the flight before boarding to run any of the plane checks required for flight to find the hydraulic issue that required nearly 3 hours to fix. $24 of meal credit buys a sandwich and a soft drink. Poor communication within the terminal about what gate we'd be re-boarding from and when we'd be re-boarding.

Amazing flight! I have never noticed the uniforms of the attendants before in twenty years of flying except today when one female had the most amazing dress on. It was beautifully designed and showed she was in charge. I never dreamed I would google who designed Delta uniforms . The ultimate compliment is when another woman admires your outfit. . I hope your designer puts it on the market

It would be nice if was given wires ear buds. Overall was a good experience was able to sleep on the plane

Efficient, calm when things were delayed and kept us regularly informed of what was happening.

Airbus plane, nice and polite staff, entertainment even as it was a short flight.

Very nice and clean plane. Transit time between flights was tight though

Our flights got changed from United to Air Canada and our purchased seats did not get transferred so we had to pay for seats twice. I brought it up with Air Canada and they stated I had to go back and chase it with United. The united seats were $21 Canadian each and Air Canada were $56 each so we have paid $77 for each seat. Very unhappy

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

Plane temperature was comfortable (not to hot) when boarding and waiting for takeoff.

Michael, our FA was very attentive, even finding me a chocolate brownie from economy class when the dessert selections were all dairy based. ( intolerant, not allergic so don’t usually need to order dairy free)

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.

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

They cancelled my flight and downgraded me to economy and only gave me $250 for the downgrade

Loved the staff, boarding and drink options! Wish the comfort of the seat could have been better nevertheless

The flight crew were friendly and attentive. Food was good and they passed out ice cream and drinks awhile after Lunch was done. The ice cream was a nice treat! I found several movies to watch during the flight. There was many movies and tv shows to choose from. We flew Premium economy and there was enough leg room to be comfortable. The seats were also comfortable. I would fly AA again if the airfare isn’t expensive.

The chair cushions may need an upgrade. I have been noticing they are so worn out, thin so you’d sit in a dip 😄. Other than that, all was an enjoyable trip. Thanks AA!

I’m impressed that we were on time in Sacramento after having a late departure in Newark and our made it. The staff was friendly and warm.

Cramped seats. FAA should make airlines have more legroom, for even short people complain

5.5 hour delay with no explanation on why, along with no proactive effort to reaccomodate me.

It was one of my worst flight ever. First they were changing the gate for at least 4 times, changing from gate D7 to D12 to D44. Considering the size of the Miami Airport, we are talking about long distance and the train at the airport was not working. Then the flight was delayed around one hour. Then finally we boarded into the plane and when everybody was seated, there was an announcement that there is an issue with one of the tire of the plane, so we all had to get out of the plane with our belongings, to replace the tire. So we had around 2.5-hour delay

Most miserable flight ever. We waited almost 2 hours on the runway because the flight was oversold. American offered $1200 credit. Then there was some nonsense about weight distribution. Ridiculous. No food for 8 plus hours on the flight. I will be writing a letter.

Honestly, I haven’t flown American in years, probably due to the pandemic and my being unable to travel for certain periods in the last two years, but it was a good experience to dig out or obtain a new American Airlines account after many years of traveling for business with American in the past.

No space in overhead bin, one cookie, 2 oz of juice - is not customer service.

Somebody either kayak or Air Canada booked my flight under my preferred name Betty instead of my legal name and I almost was denied boarding my flight

The ground staff was so rude in Toronto airport ...very rude and did not answer simple questions, and made me look like a fool. Very rude ground staff.

My flight got delayed 5 times and then got cancelled eventually, I had to get a hotel and uber and pay for food for an extra night without any plans. It was a horrible experience, instead of Air Canada, I was flying with United .

I had a nice flight with free wifi. So I was able to message family members and stream music during my flight, which made the trip go by fast. I also enjoyed flying on there Airbus A220. The plane looked very new and it also got up to speed fast down the runway and didn't need much runway to get airborne.

Overall good experience. The flight from Toronto to Denver does not have entertainment - movies to watch.

Ensure prepaid food arrangements are appropriately understood by flight crew of who purchased and who did not

All was fine. Weather was a bit stormy, but nothing kayak can do about that! 😊

I paid for a comfort class seat and was seated in economy.

My plane was cancelled and had to be rebook for the evening was not happy.

Book cheap flights from Ontario to Missouri

Recent round-trip flight deals

9/16Tue
1 stopAmerican Airlines
7h 42mYYZ-STL
9/18Thu
1 stopAmerican Airlines
10h 54mSTL-YYZ
$319
9/24Wed
1 stopAmerican Airlines
9h 02mYUL-STL
9/29Mon
1 stopAmerican Airlines
8h 07mSTL-YUL
$324
7/13Sun
1 stop
12h 24mYYZ-MCI
7/17Thu
1 stop
14h 57mMCI-YYZ
$348
7/15Tue
1 stop
11h 01mYYZ-STL
7/22Tue
1 stop
29h 29mSTL-YYZ
$349
6/29Sun
1 stopAir Canada
5h 48mYYZ-STL
7/7Mon
1 stopAir Canada
7h 14mSTL-YYZ
$376
7/21Mon
1 stopDelta
7h 27mYYZ-STL
7/31Thu
1 stopDelta
5h 36mSTL-YYZ
$416
8/14Thu
nonstopAir Canada
2h 10mYYZ-STL
8/17Sun
nonstopAir Canada
2h 00mSTL-YYZ
$418
7/16Wed
1 stopUnited Airlines
4h 27mYYZ-STL
7/20Sun
1 stopUnited Airlines
4h 16mSTL-YYZ
$424
7/31Thu
1 stopUnited Airlines
6h 27mYYZ-STL
8/7Thu
1 stopUnited Airlines
7h 42mSTL-YYZ
$452
9/24Wed
2 stopsDelta
14h 35mYUL-STL
9/29Mon
2 stopsDelta
21h 21mSTL-YUL
$478

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Recent one-way flight deals

7/19Sat
1 stop
9h 09mYYZ-STL
$156
7/19Sat
1 stop
9h 09mYYZ-STL
$159
9/15Mon
1 stopAmerican Airlines
17h 11mYUL-STL
$190
8/21Thu
1 stopAmerican Airlines
10h 19mYYZ-STL
$198
8/26Tue
nonstopAir Canada
2h 06mYYZ-STL
$223
8/21Thu
nonstopAir Canada
2h 10mYYZ-STL
$226
8/26Tue
3 stopsUnited Airlines
14h 46mYYZ-STL
$236
10/19Sun
1 stopUnited Airlines
27h 29mYUL-STL
$237
6/23Mon
1 stopDelta
6h 26mYYZ-STL
$256
9/28Sun
1 stopDelta
6h 42mYUL-MCI
$302

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Last minute flights from Ontario to Missouri

Last minute flight, train and bus deals

6/23Mon
multi-stopDelta
6h 26mYYZ-STL
6/28Sat
multi-stopDelta
4h 04mSTL-YYZ
$394
6/23Mon
multi-stop
31h 01mYYZ-MCI
6/27Fri
multi-stop
9h 08mMCI-YYZ
$470
6/23Mon
multi-stopAir Canada
6h 58mYYZ-STL
6/28Sat
nonstopAir Canada
1h 55mSTL-YYZ
$681
6/21Sat
multi-stopAmerican Airlines
11h 39mYYZ-MCI
6/28Sat
multi-stopAmerican Airlines
8h 53mMCI-YYZ
$692
6/21Sat
multi-stopAmerican Airlines
7h 08mYYZ-STL
6/25Wed
multi-stopAmerican Airlines
7h 40mSTL-YYZ
$698
6/23Mon
multi-stopUnited Airlines
15h 29mYYZ-MCI
6/27Fri
multi-stopUnited Airlines
26h 21mMCI-YYZ
$836
6/21Sat
multi-stopUnited Airlines
8h 43mYYZ-MCI
6/28Sat
multi-stopUnited Airlines
7h 14mMCI-YYZ
$877
6/20Fri
nonstopAir Canada
2h 06mYYZ-STL
6/23Mon
multi-stopAir Canada
8h 49mSTL-YYZ
$927
6/19Thu
multi-stopWestJet
6h 09mYYZ-STL
6/22Sun
multi-stopWestJet
21h 51mSTL-YYZ
$1,140
6/21Sat
multi-stopWestJet
4h 07mYYZ-STL
6/22Sun
multi-stopWestJet
11h 06mSTL-YYZ
$1,144

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Everything you need to know for your flight to Missouri

Cabin class types available on flights to Ontario

Cabin classes available on flights to Ontario. Prices are the lowest found on KAYAK over the last 7 days. Price and availability is not guaranteed.

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