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Missouri

$154+ Cheap flights from Ontario to Missouri

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 5/28. Fares are subject to change and may not be available on all flights or dates of travel.
YYZ — STL
Apr 22 — Apr 291
Tue 4/22
Tue 4/29
1 adult, Economy
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Cheap flight deals from Ontario to Missouri

Keep the following information in mind while searching for Ontario to Missouri flight deals. Data was last updated April 17, 2025.

Round-trip from

$305
(Kiwi.com)

One-way from

$154
(Kiwi.com)

Popular in

December

Cheapest in

July

Average price

$552

Good round-trip deal

$370 or less

Good one-way deal

$310 or less
From Ontario to Missouri
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One-way flight from Ontario to Missouri
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Highest demand for flights based on searches. 9% potential increase in price ($55 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($13 potential savings vs. average RT price).
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Average for round-trip flights in April 2025
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Price to beat on a round-trip flight from Ontario to Missouri.
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Price to beat on a one-way flight from Ontario to Missouri.
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Find flight deals from Ontario to Missouri

Cheapest flights from Ontario to Missouri
Explore the most affordable flight options available from Ontario to Missouri. Find the lowest fares from popular airlines and budget airlines, with prices last updated on April 17, 2025.

This Kiwi.com deal was found by Cheapflights users on 4/16. 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.
Fri 5/96:45 amYUL - STL
2 stops27h 30mMultiple Airlines
Mon 5/125:45 pmSTL - YUL
1 stop19h 35mMultiple Airlines
Deal found 4/16$305
This United Airlines deal was found by Cheapflights users on 4/16. 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 4/306:15 amYUL - MCI
1 stop5h 17mUnited Airlines
Sat 5/36:00 amMCI - YUL
2 stops10h 15mUnited Airlines
Deal found 4/16$311
This Delta deal was found by Cheapflights users on 4/16. 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.
Sat 4/263:06 pmYUL - MCI
1 stop9h 53mDelta
Thu 5/16:15 amMCI - YUL
1 stop8h 45mDelta
Deal found 4/16$330
This American Airlines deal was found by Cheapflights users on 4/16. 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 4/307:29 amYUL - MCI
1 stop8h 30mAmerican Airlines
Wed 4/306:37 pmMCI - YUL
1 stop18h 02mAmerican Airlines
Deal found 4/16$337
This Kiwi.com deal was found by Cheapflights users on 4/17. 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 5/243:50 pmYOW - STL
1 stop18h 25mMultiple Airlines
Sat 5/3110:10 amSTL - YOW
1 stop30h 05mMultiple Airlines
Deal found 4/17$350
This United Airlines deal was found by Cheapflights users on 4/17. 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 5/2111:30 amYYZ - STL
Nonstop2h 06mUnited Airlines
Tue 5/278:10 amSTL - YYZ
1 stop9h 22mUnited Airlines
Deal found 4/17$375
This FlightHub deal was found by Cheapflights users on 4/16. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/196:45 amYUL - MCI
2 stops10h 36mWestJet
Wed 5/211:15 pmMCI - YUL
1 stop9h 39mWestJet
Deal found 4/16$376
This Air Canada deal was found by Cheapflights users on 4/17. 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 5/812:00 pmYYZ - STL
1 stop4h 47mAir Canada
Sun 5/111:30 pmSTL - YYZ
1 stop7h 09mAir Canada
Deal found 4/17$378
This Delta deal was found by Cheapflights users on 4/16. 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.
Wed 5/217:21 pmYYZ - STL
1 stop5h 05mDelta
Mon 5/265:40 pmSTL - YYZ
1 stop5h 15mDelta
Deal found 4/16$380
This American Airlines deal was found by Cheapflights users on 4/17. 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 8/307:02 amYYZ - STL
1 stop8h 42mAmerican Airlines
Thu 9/118:08 amSTL - YYZ
1 stop5h 18mAmerican Airlines
Deal found 4/17$389
This American Airlines deal was found by Cheapflights users on 4/17. 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 9/2412:30 pmYUL - STL
1 stop8h 53mAmerican Airlines
Mon 9/297:23 amSTL - YUL
1 stop8h 17mAmerican Airlines
Deal found 4/17$404
This Kiwi.com deal was found by Cheapflights users on 4/16. 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 4/294:00 pmYYZ - STL
1 stop9h 04mMultiple Airlines
Thu 5/19:50 amSTL - YYZ
2 stops10h 18mMultiple Airlines
Deal found 4/16$406

Cheapflights Fare Finder

Customize your flight search to find flights from Ontario to Missouri 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 April 17, 2025.
Use the filters below to find and compare flights from Ontario to Missouri that are best for you.

Fly from

Ontario

Fly to

Missouri

Route

Depart

Return

Price

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Fri 5/9

6:45 am-9:15 am

2 stops27h 30m

Lambert-St Louis

Mon 5/12

5:45 pm-2:20 pm

1 stop19h 35m

$305

MontrealKansas City

YUL - MCI

YULMCI

Montreal Pierre Elliott Trudeau Intl

Wed 4/30

6:15 am-10:32 am

1 stop5h 17m

Kansas City

Sat 5/3

6:00 am-5:15 pm

2 stops10h 15m

$311

MontrealKansas City

YUL - MCI

YULMCI

Montreal Pierre Elliott Trudeau Intl

Wed 4/30

7:29 am-2:59 pm

1 stop8h 30m

Kansas City

Wed 4/30

6:37 pm-1:39 pm

1 stop18h 02m

$337

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

Sat 5/24

3:50 pm-9:15 am

1 stop18h 25m

Lambert-St Louis

Sat 5/31

10:10 am-5:15 pm

1 stop30h 05m

$350

MontrealKansas City

YUL - MCI

YULMCI

Montreal Pierre Elliott Trudeau Intl

Mon 4/28

6:00 pm-11:59 pm

1 stop6h 59m

Kansas City

Wed 4/30

5:45 am-4:42 pm

1 stop9h 57m

$356

TorontoSt. Louis

YYZ - STL

YYZSTL

Toronto Pearson Intl

Wed 5/21

11:30 am-12:36 pm

Nonstop2h 06m

Lambert-St Louis

Tue 5/27

8:10 am-6:32 pm

1 stop9h 22m

$375

MontrealKansas City

YUL - MCI

YULMCI

Montreal Pierre Elliott Trudeau Intl

Mon 5/19

6:45 am-4:21 pm

2 stops10h 36m

Kansas City

Wed 5/21

1:15 pm-11:54 pm

1 stop9h 39m

$376

TorontoSt. Louis

YYZ - STL

YYZSTL

Toronto Pearson Intl

Thu 5/8

12:00 pm-3:47 pm

1 stop4h 47m

Lambert-St Louis

Sun 5/11

1:30 pm-9:39 pm

1 stop7h 09m

$378

TorontoSt. Louis

YYZ - STL

YYZSTL

Toronto Pearson Intl

Wed 5/21

7:21 pm-11:26 pm

1 stop5h 05m

Lambert-St Louis

Mon 5/26

5:40 pm-11:55 pm

1 stop5h 15m

$380

TorontoSt. Louis

YYZ - STL

YYZSTL

Toronto Pearson Intl

Sat 8/30

7:02 am-2:44 pm

1 stop8h 42m

Lambert-St Louis

Thu 9/11

8:08 am-2:26 pm

1 stop5h 18m

$389

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/16

Showing 1-10 of 56 results
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Best time to book a flight from Ontario to Missouri

Have a flexible travel schedule? Discover the best time to fly to Missouri from Ontario 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 Ontario to Missouri

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

Currently, August is the cheapest month in which you can book a flight from Region of Ontario to Missouri (average of $311). Flying from Region of Ontario to Missouri in March is currently the most expensive (average of $356). 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 ON to MO?

Find hourly flight availability from Ontario to Missouri. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated April 17, 2025.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Region of Ontario to Missouri as you normally would.

Rainfall in Missouri by month

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

In terms of precipitation, rainfall in Missouri ranges from 1.1 - 5.2 inches per month. May is typically the wettest month, when rainfall can reach 5.2 in. January is typically the driest time to visit Missouri when rainfall is around 1.1 in.

Temperature in Missouri by month

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

If weather is an important factor for your trip to Missouri, 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 78.8 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 28.4 F).

Reviews of airlines servicing Missouri

Get insights into the airlines that provide service to Missouri. 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 Missouri. Reviews last updated April 17, 2025.
To help decide which airline to fly from Ontario to Missouri, see what other customers have to say about Alaska Airlines, Delta and United Airlines. In addition to providing an overall rating, users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
9,887 reviews

Entertainment

7.1

Comfort

7.9

Crew

8.5

Overall

8.0

Food

7.1

Boarding

8.1

Reviews

1 / 20
4.0
Okay

Anonymous,Apr 2025

LAS - STS

flight was delayed both ways even tho the weather was clear >
Alaska Airlines
8.0
Very good
9,887 reviews
Alaska Airlines
8.0
Very good
9,887 reviews

Entertainment

7.1

Comfort

7.9

Crew

8.5

Overall

8.0

Food

7.1

Boarding

8.1

Reviews

1 / 20
4.0
Okay

Anonymous,Apr 2025

LAS - STS

flight was delayed both ways even tho the weather was clear >
Delta
8.0
Very good
7,916 reviews
Alaska Airlines
8.0
Very good
9,887 reviews

Entertainment

7.1

Comfort

7.9

Crew

8.5

Overall

8.0

Food

7.1

Boarding

8.1

Reviews

1 / 20
4.0
Okay

Anonymous,Apr 2025

LAS - STS

flight was delayed both ways even tho the weather was clear >
United Airlines
7.4
Good
8,667 reviews
Alaska Airlines
8.0
Very good
9,887 reviews

Entertainment

7.1

Comfort

7.9

Crew

8.5

Overall

8.0

Food

7.1

Boarding

8.1

Reviews

1 / 20
4.0
Okay

Anonymous,Apr 2025

LAS - STS

flight was delayed both ways even tho the weather was clear >
American Airlines
7.2
Good
10,000 reviews
Alaska Airlines
8.0
Very good
9,887 reviews

Entertainment

7.1

Comfort

7.9

Crew

8.5

Overall

8.0

Food

7.1

Boarding

8.1

Reviews

1 / 20
4.0
Okay

Anonymous,Apr 2025

LAS - STS

flight was delayed both ways even tho the weather was clear >
WestJet
7.2
Good
2,809 reviews
Alaska Airlines
8.0
Very good
9,887 reviews

Entertainment

7.1

Comfort

7.9

Crew

8.5

Overall

8.0

Food

7.1

Boarding

8.1

Reviews

1 / 20
4.0
Okay

Anonymous,Apr 2025

LAS - STS

flight was delayed both ways even tho the weather was clear >

Related info for your journey

Find useful and relevant information for your journey from Ontario to Missouri. 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 Region of Ontario to Missouri one-way?

    To fly one-way, consider booking your trip with American Airlines, which is currently one of the cheapest options available, starting at $183. Delta flights start at $185 while deals on United Airlines start at $190 one-way.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Ontario to Missouri 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 Region of Ontario to Missouri?

    Currently, August is the cheapest month in which you can book a flight from Region of Ontario to Missouri (average of $311). Flying from Region of Ontario to Missouri in March is currently the most expensive (average of $356). 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 Ontario to Missouri

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

Discover the top 5 airlines that operate flights from Ontario to Missouri. 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 April 17, 2025.
AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapest$356Average$536FlexibilityNo cancel feeOn-time67%
United AirlinesCheapest$371Average$573FlexibilityNo cancel feeOn-time69%
DeltaCheapest$389Average$485FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$421Average$521FlexibilityNo cancel feeOn-time71%
WestJetCheapest$448Average$606FlexibilityNo cancel feeOn-time60%

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