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Missouri

$194+ 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 5/20. Fares are subject to change and may not be available on all flights or dates of travel.
YYZ — STL
May 6 — May 131
Tue 5/6
Tue 5/13
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 May 1, 2025.

Round-trip from

$362
(Delta)

One-way from

$194
(Kiwi.com)

Popular in

December

Cheapest in

June

Average price

$520

Good round-trip deal

$214 or less

Good one-way deal

$214 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 ($54 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 May 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 May 1, 2025.

This Delta deal was found by Cheapflights users on 4/30. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/612:44 pmYUL - MCI
1 stop8h 43mDelta
Mon 6/95:26 pmMCI - YUL
1 stop5h 28mDelta
Deal found 4/30$362
This Kiwi.com deal was found by Cheapflights users on 4/30. 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 5/247:00 amYOW - MCI
2 stops14h 12mMultiple Airlines
Tue 5/275:46 amMCI - YOW
1 stop10h 20mMultiple Airlines
Deal found 4/30$386
This Mytrip deal was found by Cheapflights users on 4/30. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/2211:00 amYYZ - STL
2 stops34h 10mMultiple Airlines
Sun 5/2512:15 pmSTL - YYZ
2 stops30h 22mMultiple Airlines
Deal found 4/30$391
This Mytrip deal was found by Cheapflights users on 4/30. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 6/76:45 amYUL - MCI
2 stops14h 27mMultiple Airlines
Wed 6/1811:05 amMCI - YUL
2 stops12h 32mMultiple Airlines
Deal found 4/30$392
This Kiwi.com deal was found by Cheapflights users on 4/30. 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.
Mon 5/269:45 amYYZ - MCI
1 stop10h 18mMultiple Airlines
Thu 5/295:46 amMCI - YYZ
2 stops14h 22mMultiple Airlines
Deal found 4/30$394
This Booking.com deal was found by Cheapflights users on 4/30. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 6/1411:30 amYYZ - STL
Nonstop2h 06mAir Canada
Sat 6/217:30 amSTL - YYZ
Nonstop1h 55mAir Canada
Deal found 4/30$409
This WestJet deal was found by Cheapflights users on 4/30. 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 WestJet is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/166:45 amYUL - MCI
2 stops27h 40mWestJet
Wed 5/215:45 amMCI - YUL
1 stop10h 55mWestJet
Deal found 4/30$422
This Kiwi.com deal was found by Cheapflights users on 4/30. 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.
Tue 6/109:50 amYYZ - SGF
1 stop22h 53mMultiple Airlines
Fri 6/138:25 pmSGF - YYZ
1 stop17h 04mMultiple Airlines
Deal found 4/30$427
This Delta deal was found by Cheapflights users on 4/30. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/221:25 pmYYZ - STL
1 stop5h 36mDelta
Sun 5/256:00 amSTL - YYZ
1 stop4h 40mDelta
Deal found 4/30$441
This United Airlines deal was found by Cheapflights users on 4/30. 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.
Fri 8/112:00 pmYYZ - STL
1 stop4h 47mUnited Airlines
Tue 8/56:00 amSTL - YYZ
1 stop6h 47mUnited Airlines
Deal found 4/30$442
This American Airlines deal was found by Cheapflights users on 4/29. 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.
Sat 6/146:30 amYYZ - SGF
1 stop11h 33mAmerican Airlines
Sat 6/215:33 pmSGF - YYZ
1 stop16h 26mAmerican Airlines
Deal found 4/29$457
This United Airlines deal was found by Cheapflights users on 4/30. 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.
Thu 5/82:20 pmYUL - MCI
2 stops10h 24mUnited Airlines
Sat 5/316:05 amMCI - YUL
1 stop6h 04mUnited Airlines
Deal found 4/30$460

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 May 1, 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

MontrealKansas City

YUL - MCI

YULMCI

Montreal Pierre Elliott Trudeau Intl

Fri 6/6

12:44 pm-8:27 pm

1 stop8h 43m

Kansas City

Mon 6/9

5:26 pm-11:54 pm

1 stop5h 28m

$362

OttawaKansas City

YOW - MCI

YOWMCI

Ottawa

Sat 5/24

7:00 am-8:12 pm

2 stops14h 12m

Kansas City

Tue 5/27

5:46 am-5:06 pm

1 stop10h 20m

$386

TorontoSt. Louis

YYZ - STL

YYZSTL

Toronto Pearson Intl

Thu 5/22

11:00 am-8:10 pm

2 stops34h 10m

Lambert-St Louis

Sun 5/25

12:15 pm-7:37 pm

2 stops30h 22m

$391

MontrealKansas City

YUL - MCI

YULMCI

Montreal Pierre Elliott Trudeau Intl

Sat 6/7

6:45 am-8:12 pm

2 stops14h 27m

Kansas City

Wed 6/18

11:05 am-12:37 am

2 stops12h 32m

$392

TorontoKansas City

YYZ - MCI

YYZMCI

Toronto Pearson Intl

Mon 5/26

9:45 am-7:03 pm

1 stop10h 18m

Kansas City

Thu 5/29

5:46 am-9:08 pm

2 stops14h 22m

$394

TorontoSt. Louis

YYZ - STL

YYZSTL

Toronto Pearson Intl

Sat 6/14

11:30 am-12:36 pm

Nonstop2h 06m

Lambert-St Louis

Sat 6/21

7:30 am-10:25 am

Nonstop1h 55m

$409

MontrealKansas City

YUL - MCI

YULMCI

Montreal Pierre Elliott Trudeau Intl

Fri 5/16

6:45 am-9:25 am

2 stops27h 40m

Kansas City

Wed 5/21

5:45 am-5:40 pm

1 stop10h 55m

$422

TorontoSpringfield

YYZ - SGF

YYZSGF

Toronto Pearson Intl

Tue 6/10

9:50 am-7:43 am

1 stop22h 53m

Springfield-Branson

Fri 6/13

8:25 pm-2:29 pm

1 stop17h 04m

$427

TorontoSt. Louis

YYZ - STL

YYZSTL

Toronto Pearson Intl

Thu 5/22

1:25 pm-6:01 pm

1 stop5h 36m

Lambert-St Louis

Sun 5/25

6:00 am-11:40 am

1 stop4h 40m

$441

TorontoSt. Louis

YYZ - STL

YYZSTL

Toronto Pearson Intl

Fri 8/1

12:00 pm-3:47 pm

1 stop4h 47m

Lambert-St Louis

Tue 8/5

6:00 am-1:47 pm

1 stop6h 47m

$442

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/30

Showing 1-10 of 54 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 May 1, 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 May 1, 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
9,968 reviews

Entertainment

7.1

Food

7.1

Crew

8.5

Comfort

7.9

Overall

8.0

Boarding

8.2

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Alaska Airlines
8.0
Very good
9,968 reviews
Alaska Airlines
8.0
Very good
9,968 reviews

Entertainment

7.1

Food

7.1

Crew

8.5

Comfort

7.9

Overall

8.0

Boarding

8.2

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Delta
8.0
Very good
7,934 reviews
Alaska Airlines
8.0
Very good
9,968 reviews

Entertainment

7.1

Food

7.1

Crew

8.5

Comfort

7.9

Overall

8.0

Boarding

8.2

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
United Airlines
7.4
Good
8,696 reviews
Alaska Airlines
8.0
Very good
9,968 reviews

Entertainment

7.1

Food

7.1

Crew

8.5

Comfort

7.9

Overall

8.0

Boarding

8.2

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
American Airlines
7.2
Good
10,000 reviews
Alaska Airlines
8.0
Very good
9,968 reviews

Entertainment

7.1

Food

7.1

Crew

8.5

Comfort

7.9

Overall

8.0

Boarding

8.2

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
WestJet
7.2
Good
2,826 reviews
Alaska Airlines
8.0
Very good
9,968 reviews

Entertainment

7.1

Food

7.1

Crew

8.5

Comfort

7.9

Overall

8.0

Boarding

8.2

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

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 Air Canada, which is currently one of the cheapest options available, starting at $211. United Airlines flights start at $237 while deals on Delta start at $238 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 May 1, 2025.
AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapest$356Average$536FlexibilityNo cancel feeOn-time67%
United AirlinesCheapest$372Average$572FlexibilityNo cancel feeOn-time69%
DeltaCheapest$389Average$494FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$421Average$521FlexibilityNo cancel feeOn-time71%
WestJetCheapest$526Average$736FlexibilityNo cancel feeOn-time60%

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