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Ontario

$126+ 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 7/4. Fares are subject to change and may not be available on all flights or dates of travel.
STL — YYZ
Jun 17 — Jun 241
Tue 6/17
Tue 6/24
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 June 12, 2025.

Round-trip from

$302
(Mytrip)

One-way from

$126
(Kiwi.com)

Popular in

January

Cheapest in

September

Average price

$625

Good round-trip deal

$692 or less

Good one-way deal

$177 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 ($32 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($13 potential savings vs. average RT price).
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Average for round-trip flights in June 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 June 12, 2025.

This Mytrip deal was found by Cheapflights users on 6/10. 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.
Wed 7/911:24 amSTL - YYZ
2 stops25h 41mMultiple Airlines
Tue 7/156:30 amYYZ - STL
1 stop11h 01mMultiple Airlines
Deal found 6/10$302
This Mytrip deal was found by Cheapflights users on 6/11. 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.
Fri 7/411:00 amMCI - YYZ
1 stop9h 08mMultiple Airlines
Sat 7/126:30 amYYZ - MCI
1 stop11h 39mMultiple Airlines
Deal found 6/11$312
This American Airlines deal was found by Cheapflights users on 6/11. 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.
Mon 9/155:55 amSTL - YYZ
1 stop10h 54mAmerican Airlines
Wed 9/1711:44 amYYZ - STL
1 stop11h 09mAmerican Airlines
Deal found 6/11$337
This American Airlines deal was found by Cheapflights users on 6/11. 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.
Thu 9/187:23 amSTL - YUL
1 stop8h 07mAmerican Airlines
Tue 9/235:15 pmYUL - STL
1 stop17h 11mAmerican Airlines
Deal found 6/11$340
This American Airlines deal was found by Cheapflights users on 6/11. 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 10/216:14 amMCI - YYZ
1 stop10h 26mAmerican Airlines
Wed 10/291:15 pmYYZ - MCI
1 stop11h 44mAmerican Airlines
Deal found 6/11$349
This Sun Country Air deal was found by Cheapflights users on 6/9. 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 Sun Country Air is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 6/296:12 amSTL - YYZ
1 stop9h 38mSun Country Air
Thu 7/311:40 amYYZ - STL
1 stop24h 50mSun Country Air
Deal found 6/9$362
This Air Canada deal was found by Cheapflights users on 6/10. 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.
Sun 6/227:30 amSTL - YYZ
Nonstop1h 55mAir Canada
Thu 6/2611:30 amYYZ - STL
Nonstop2h 06mAir Canada
Deal found 6/10$372
This United Airlines deal was found by Cheapflights users on 6/10. 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.
Fri 6/205:20 amSTL - YYZ
1 stop8h 51mUnited Airlines
Fri 6/205:15 pmYYZ - STL
1 stop6h 30mUnited Airlines
Deal found 6/10$373
This Delta deal was found by Cheapflights users on 6/10. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/206:40 amSTL - YYZ
1 stop7h 01mDelta
Sat 6/213:31 pmYYZ - STL
1 stop5h 59mDelta
Deal found 6/10$397
This Mytrip deal was found by Cheapflights users on 6/10. 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.
Mon 7/1410:47 amSTL - YUL
2 stops30h 08mMultiple Airlines
Mon 7/218:55 amYUL - STL
3 stops32h 36mMultiple Airlines
Deal found 6/10$402
This American Airlines deal was found by Cheapflights users on 6/10. 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 8/275:39 amMCI - YUL
1 stop10h 02mAmerican Airlines
Tue 9/25:29 pmYUL - MCI
1 stop18h 55mAmerican Airlines
Deal found 6/10$406
This Mytrip deal was found by Cheapflights users on 6/11. 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.
Mon 7/216:04 pmMCI - YTZ
2 stops24h 38mMultiple Airlines
Fri 7/259:00 amYTZ - MCI
3 stops31h 17mMultiple Airlines
Deal found 6/11$407

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 June 12, 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

St. LouisToronto

STL - YYZ

STLYYZ

Lambert-St Louis

Wed 7/9

11:24 am-2:05 pm

2 stops25h 41m

Toronto Pearson Intl

Tue 7/15

6:30 am-4:31 pm

1 stop11h 01m

$302

Kansas CityToronto

MCI - YYZ

MCIYYZ

Kansas City

Fri 7/4

11:00 am-9:08 pm

1 stop9h 08m

Toronto Pearson Intl

Sat 7/12

6:30 am-5:09 pm

1 stop11h 39m

$312

St. LouisToronto

STL - YYZ

STLYYZ

Lambert-St Louis

Mon 9/15

5:55 am-5:49 pm

1 stop10h 54m

Toronto Pearson Intl

Wed 9/17

11:44 am-9:53 pm

1 stop11h 09m

$337

St. LouisToronto

STL - YYZ

STLYYZ

Lambert-St Louis

Sun 6/29

6:12 am-4:50 pm

1 stop9h 38m

Toronto Pearson Intl

Thu 7/3

11:40 am-11:30 am

1 stop24h 50m

$362

St. LouisToronto

STL - YYZ

STLYYZ

Lambert-St Louis

Sun 6/22

7:30 am-10:25 am

Nonstop1h 55m

Toronto Pearson Intl

Thu 6/26

11:30 am-12:36 pm

Nonstop2h 06m

$372

Kansas CityToronto

MCI - YYZ

MCIYYZ

Kansas City

Mon 8/4

7:00 am-5:40 pm

1 stop9h 40m

Toronto Pearson Intl

Tue 8/12

11:39 am-8:48 pm

1 stop10h 09m

$377

St. LouisToronto

STL - YYZ

STLYYZ

Lambert-St Louis

Thu 9/25

12:25 pm-9:02 pm

1 stop7h 37m

Toronto Pearson Intl

Sun 9/28

2:10 pm-2:27 pm

1 stop25h 17m

$394

St. LouisMontreal

STL - YUL

STLYUL

Lambert-St Louis

Mon 7/14

10:47 am-5:55 pm

2 stops30h 08m

Montreal Pierre Elliott Trudeau Intl

Mon 7/21

8:55 am-4:31 pm

3 stops32h 36m

$402

Kansas CityMontreal

MCI - YUL

MCIYUL

Kansas City

Wed 8/27

5:39 am-4:41 pm

1 stop10h 02m

Montreal Pierre Elliott Trudeau Intl

Tue 9/2

5:29 pm-11:24 am

1 stop18h 55m

$406

Kansas CityToronto

MCI - YTZ

MCIYTZ

Kansas City

Mon 7/21

6:04 pm-7:42 pm

2 stops24h 38m

Toronto Island

Fri 7/25

9:00 am-3:17 pm

3 stops31h 17m

$407

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/11

Showing 1-10 of 57 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 July is currently the most expensive (average of $353). 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 June 12, 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 June 12, 2025.

The most flights from USMO to CAON are scheduled on a Wednesday (4 on average). You will have fewer flight options on Sunday, which is when the least amount of flights are scheduled (2 on average).

Rainfall in Ontario by month

Plan your trip to Ontario by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Region of Ontario ranges from 2.0 - 3.3 inches per month. June is typically the wettest month, when rainfall can reach 3.3 in. February is typically the driest time to visit Region of Ontario when rainfall is around 2.0 in.

Temperature in Ontario by month

Plan your trip to Ontario by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Region of Ontario, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 69.8 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 21.2 F).

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 June 12, 2025.
Peruse reviews from past customers who have flown with Alaska Airlines, Delta and United Airlines from Missouri to Ontario to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Boarding

8.1

Comfort

7.8

Overall

8.0

Entertainment

7.1

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Surinder,May 2025

SEA - YYZ

My wife wanted the aile seat and I always prefer window seat. Luckily we both got the best seats we wanted. The plane was very nice and we enjoyed the best take off and the smooth landing at Toronto. All the services by the staff inside the aeroplane were very nice well appreciated. Thanks again and hope to see you soon.
Alaska Airlines
8.0
Very good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Boarding

8.1

Comfort

7.8

Overall

8.0

Entertainment

7.1

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Surinder,May 2025

SEA - YYZ

My wife wanted the aile seat and I always prefer window seat. Luckily we both got the best seats we wanted. The plane was very nice and we enjoyed the best take off and the smooth landing at Toronto. All the services by the staff inside the aeroplane were very nice well appreciated. Thanks again and hope to see you soon.
Delta
8.0
Very good
7,950 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Boarding

8.1

Comfort

7.8

Overall

8.0

Entertainment

7.1

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Surinder,May 2025

SEA - YYZ

My wife wanted the aile seat and I always prefer window seat. Luckily we both got the best seats we wanted. The plane was very nice and we enjoyed the best take off and the smooth landing at Toronto. All the services by the staff inside the aeroplane were very nice well appreciated. Thanks again and hope to see you soon.
United Airlines
7.4
Good
8,790 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Boarding

8.1

Comfort

7.8

Overall

8.0

Entertainment

7.1

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Surinder,May 2025

SEA - YYZ

My wife wanted the aile seat and I always prefer window seat. Luckily we both got the best seats we wanted. The plane was very nice and we enjoyed the best take off and the smooth landing at Toronto. All the services by the staff inside the aeroplane were very nice well appreciated. Thanks again and hope to see you soon.
American Airlines
7.2
Good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Boarding

8.1

Comfort

7.8

Overall

8.0

Entertainment

7.1

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Surinder,May 2025

SEA - YYZ

My wife wanted the aile seat and I always prefer window seat. Luckily we both got the best seats we wanted. The plane was very nice and we enjoyed the best take off and the smooth landing at Toronto. All the services by the staff inside the aeroplane were very nice well appreciated. Thanks again and hope to see you soon.
WestJet
7.2
Good
2,868 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Boarding

8.1

Comfort

7.8

Overall

8.0

Entertainment

7.1

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Surinder,May 2025

SEA - YYZ

My wife wanted the aile seat and I always prefer window seat. Luckily we both got the best seats we wanted. The plane was very nice and we enjoyed the best take off and the smooth landing at Toronto. All the services by the staff inside the aeroplane were very nice well appreciated. Thanks again and hope to see you soon.

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 $141. However, be on the lookout for offers from Sun Country Air and Delta, 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 July is currently the most expensive (average of $353). 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 June 12, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$220Average$704FlexibilityNo cancel feeOn-time69%
Air CanadaCheapest$220Average$622FlexibilityNo cancel feeOn-time67%
American AirlinesCheapest$304Average$636FlexibilityNo cancel feeOn-time71%
DeltaCheapest$495Average$712FlexibilityNo cancel feeOn-timeN/A
WestJetCheapest$497Average$706FlexibilityNo cancel feeOn-time60%

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