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$141+ Cheap flights from Missouri to Ontario

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 9/13. Fares are subject to change and may not be available on all flights or dates of travel.
STL — YYZ
Aug 5 — Aug 121
Tue 8/5
Tue 8/12
1 adult, Economy
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Cheap flight deals from Missouri to Ontario

Keep the following information in mind while searching for Missouri to Ontario flight deals. Data was last updated July 31, 2025.

Round-trip from

$319
(Kiwi.com)

One-way from

$141
(Kiwi.com)

Popular in

January

Cheapest in

September

Average price

$740

Good round-trip deal

$667 or less

Good one-way deal

$387 or less
From Missouri to Ontario
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One-way flight from Missouri to Ontario
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Highest demand for flights based on searches. 4% potential increase in price ($31 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($12 potential savings vs. average RT price).
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Average for round-trip flights in July 2025
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Price to beat on a round-trip flight from Missouri to Ontario.
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Price to beat on a one-way flight from Missouri to Ontario.
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Find flight deals from Missouri to Ontario

Cheapest flights from Missouri to Ontario
Explore the most affordable flight options available from Missouri to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 31, 2025.

This Kiwi.com deal was found by Cheapflights users on 7/31. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/36:00 amMCI - YYZ
1 stop9h 36mMultiple Airlines
Wed 9/109:50 amYYZ - MCI
1 stop14h 17mMultiple Airlines
Deal found 7/31$319
This Kiwi.com deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/135:15 amMCI - YUL
1 stop8h 05mMultiple Airlines
Sat 9/206:45 amYUL - MCI
2 stops17h 22mMultiple Airlines
Deal found 7/30$335
This American Airlines deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/28:01 pmSTL - YYZ
1 stop15h 31mAmerican Airlines
Wed 9/103:11 pmYYZ - STL
1 stop7h 42mAmerican Airlines
Deal found 7/30$345
This American Airlines deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/106:10 amSTL - YUL
1 stop9h 23mAmerican Airlines
Mon 9/155:15 pmYUL - STL
1 stop17h 11mAmerican Airlines
Deal found 7/30$348
This Mytrip deal was found by Cheapflights users on 7/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/412:05 pmSTL - YYZ
2 stops22h 30mMultiple Airlines
Sat 9/67:00 amYYZ - STL
3 stops28h 50mMultiple Airlines
Deal found 7/29$355
This Kiwi.com deal was found by Cheapflights users on 7/31. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/305:15 amMCI - YOW
1 stop10h 42mMultiple Airlines
Sat 10/184:25 pmYOW - MCI
1 stop8h 25mMultiple Airlines
Deal found 7/31$379
This Mytrip deal was found by Cheapflights users on 7/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/95:15 amMCI - YTZ
2 stops12h 48mMultiple Airlines
Wed 9/109:45 amYTZ - MCI
2 stops14h 22mMultiple Airlines
Deal found 7/29$394
This American Airlines deal was found by Cheapflights users on 7/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/217:49 pmMCI - YYZ
1 stop15h 46mAmerican Airlines
Wed 10/2911:45 amYYZ - MCI
1 stop10h 07mAmerican Airlines
Deal found 7/29$431
This American Airlines deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/116:00 amMCI - YUL
1 stop9h 39mAmerican Airlines
Sat 10/1812:30 pmYUL - MCI
1 stop9h 41mAmerican Airlines
Deal found 7/30$434
This Air Canada deal was found by Cheapflights users on 7/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/44:05 pmSTL - YYZ
Nonstop1h 55mAir Canada
Sun 9/76:35 pmYYZ - STL
Nonstop2h 03mAir Canada
Deal found 7/29$437
This United Airlines deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/33:20 pmSTL - YYZ
1 stop7h 38mUnited Airlines
Wed 9/109:00 amYYZ - STL
1 stop7h 44mUnited Airlines
Deal found 7/30$442
This American Airlines deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/135:50 amSGF - YYZ
1 stop10h 53mAmerican Airlines
Sat 9/2011:44 amYYZ - SGF
1 stop10h 20mAmerican Airlines
Deal found 7/30$443

Cheapflights Fare Finder

 
Customize your flight search to find flights from Missouri to Ontario that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated July 31, 2025.
Use the filters below to find and compare flights from Missouri to Ontario that are best for you.

Fly from

Missouri

Fly to

Ontario

Route

Depart

Return

Price

Kansas CityToronto

MCI - YYZ

MCIYYZ

Kansas City

Wed 9/3

6:00 am-4:36 pm

1 stop9h 36m

Toronto Pearson Intl

Wed 9/10

9:50 am-11:07 pm

1 stop14h 17m

$319

Kansas CityMontreal

MCI - YUL

MCIYUL

Kansas City

Sat 9/13

5:15 am-2:20 pm

1 stop8h 05m

Montreal Pierre Elliott Trudeau Intl

Sat 9/20

6:45 am-11:07 pm

2 stops17h 22m

$335

St. LouisToronto

STL - YYZ

STLYYZ

Lambert-St Louis

Tue 9/2

8:01 pm-12:32 pm

1 stop15h 31m

Toronto Pearson Intl

Wed 9/10

3:11 pm-9:53 pm

1 stop7h 42m

$345

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Wed 9/10

6:10 am-4:33 pm

1 stop9h 23m

Montreal Pierre Elliott Trudeau Intl

Mon 9/15

5:15 pm-9:26 am

1 stop17h 11m

$348

St. LouisToronto

STL - YYZ

STLYYZ

Lambert-St Louis

Thu 9/4

12:05 pm-11:35 am

2 stops22h 30m

Toronto Pearson Intl

Sat 9/6

7:00 am-10:50 am

3 stops28h 50m

$355

Kansas CityOttawa

MCI - YOW

MCIYOW

Kansas City

Tue 9/30

5:15 am-4:57 pm

1 stop10h 42m

Ottawa

Sat 10/18

4:25 pm-11:50 pm

1 stop8h 25m

$379

Kansas CityToronto

MCI - YTZ

MCIYTZ

Kansas City

Tue 9/9

5:15 am-7:03 pm

2 stops12h 48m

Toronto Island

Wed 9/10

9:45 am-11:07 pm

2 stops14h 22m

$394

Kansas CityToronto

MCI - YYZ

MCIYYZ

Kansas City

Tue 10/21

7:49 pm-12:35 pm

1 stop15h 46m

Toronto Pearson Intl

Wed 10/29

11:45 am-8:52 pm

1 stop10h 07m

$431

Kansas CityMontreal

MCI - YUL

MCIYUL

Kansas City

Sat 10/11

6:00 am-4:39 pm

1 stop9h 39m

Montreal Pierre Elliott Trudeau Intl

Sat 10/18

12:30 pm-9:11 pm

1 stop9h 41m

$434

St. LouisToronto

STL - YYZ

STLYYZ

Lambert-St Louis

Thu 9/4

4:05 pm-7:00 pm

Nonstop1h 55m

Toronto Pearson Intl

Sun 9/7

6:35 pm-7:38 pm

Nonstop2h 03m

$437

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/29

Showing 1-10 of 49 results
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Best time to book a flight from Missouri to Ontario

Have a flexible travel schedule? Discover the best time to fly to Ontario from Missouri with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Missouri to Ontario

What is the cheapest month to book a flight from Missouri to Region of Ontario?

Currently, January is the cheapest month in which you can book a flight from Missouri to Region of Ontario (average of $243). Flying from Missouri to Region of Ontario in August is currently the most expensive (average of $348). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from MO to ON?

Find hourly flight availability from Missouri to Ontario. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated July 31, 2025.

When flying from Missouri to Region of Ontario, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

Weekly flight availability from Missouri to Region of Ontario

Explore weekly flight availability from Missouri to Ontario. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated July 31, 2025.

The most flights from USMO to CAON are scheduled on a Monday (4 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (4 on average).

Reviews of airlines servicing Ontario

Get insights into the airlines that provide service to Ontario. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Ontario. Reviews last updated July 31, 2025.
See what other customers who have flown with Alaska Airlines, Delta, and United Airlines from Missouri to Ontario have to say. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
10,000 reviews

Overall

8.0

Comfort

7.8

Crew

8.5

Boarding

8.1

Food

7.1

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Jonathan,Jul 2025

SEA - BOS

Fantastic Check-in with easy baggage drop. While it took a while to find out which was the gate, the boarding was a dream, the stewards were simply incredible and the flight fantastic.
Alaska Airlines
8.0
Very good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Overall

8.0

Comfort

7.8

Crew

8.5

Boarding

8.1

Food

7.1

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Jonathan,Jul 2025

SEA - BOS

Fantastic Check-in with easy baggage drop. While it took a while to find out which was the gate, the boarding was a dream, the stewards were simply incredible and the flight fantastic.
Delta
8.0
Very good
7,981 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Overall

8.0

Comfort

7.8

Crew

8.5

Boarding

8.1

Food

7.1

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Jonathan,Jul 2025

SEA - BOS

Fantastic Check-in with easy baggage drop. While it took a while to find out which was the gate, the boarding was a dream, the stewards were simply incredible and the flight fantastic.
United Airlines
7.4
Good
8,900 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Overall

8.0

Comfort

7.8

Crew

8.5

Boarding

8.1

Food

7.1

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Jonathan,Jul 2025

SEA - BOS

Fantastic Check-in with easy baggage drop. While it took a while to find out which was the gate, the boarding was a dream, the stewards were simply incredible and the flight fantastic.
American Airlines
7.2
Good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Overall

8.0

Comfort

7.8

Crew

8.5

Boarding

8.1

Food

7.1

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Jonathan,Jul 2025

SEA - BOS

Fantastic Check-in with easy baggage drop. While it took a while to find out which was the gate, the boarding was a dream, the stewards were simply incredible and the flight fantastic.
Air Canada
7.1
Good
9,851 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Overall

8.0

Comfort

7.8

Crew

8.5

Boarding

8.1

Food

7.1

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Jonathan,Jul 2025

SEA - BOS

Fantastic Check-in with easy baggage drop. While it took a while to find out which was the gate, the boarding was a dream, the stewards were simply incredible and the flight fantastic.

Related info for your journey

Find useful and relevant information for your journey from Missouri to Ontario. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What are the cheapest airlines to fly from Missouri to Region of Ontario one-way?

    The cheapest airline one-way is American Airlines, with whom users have recently found tickets for as low as $143. However, be on the lookout for offers from Delta and United Airlines, as they are both options that can get you from Missouri to Region of Ontario for a low price.

  • Can I find deals for flights from Missouri to Ontario that include hotel bookings?

    Yes. In addition to deals on Missouri to Ontario flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Missouri to Ontario?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Missouri to Ontario.

  • Can I find deals for business class flights from Missouri to Ontario?

    Yes. Cheapflights offers flight deals from Missouri to Ontario by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Missouri to Region of Ontario?

    Currently, January is the cheapest month in which you can book a flight from Missouri to Region of Ontario (average of $243). Flying from Missouri to Region of Ontario in August is currently the most expensive (average of $348). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

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Alternative routes for Missouri to Ontario

See prices for flight routes from nearby airports that may be better suited for you.
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Top 5 airlines flying from Missouri to Ontario

Discover the top 5 airlines that operate flights from Missouri to Ontario. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated July 31, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$214Average$653FlexibilityNo cancel feeOn-time69%
Air CanadaCheapest$220Average$625FlexibilityNo cancel feeOn-time67%
American AirlinesCheapest$330Average$626FlexibilityNo cancel feeOn-time71%
DeltaCheapest$464Average$721FlexibilityNo cancel feeOn-timeN/A
WestJetCheapest$497Average$727FlexibilityNo cancel feeOn-time60%

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