HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Missouri

$160+ 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 7/15. Fares are subject to change and may not be available on all flights or dates of travel.
YYZ — STL
Jun 17 — Jun 241
Tue 6/17
Tue 6/24
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Ontario to Missouri with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

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 June 12, 2025.

Round-trip from

$331
(Kiwi.com)

One-way from

$160
(Mytrip)

Popular in

December

Cheapest in

October

Average price

$506

Good round-trip deal

$324 or less

Good one-way deal

$188 or less
From Ontario to Missouri
Search Deals
One-way flight from Ontario to Missouri
Search Deals
Highest demand for flights based on searches. 6% potential increase in price ($36 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($12 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in June 2025
Search Deals
Price to beat on a round-trip flight from Ontario to Missouri.
Search Deals
Price to beat on a one-way flight from Ontario to Missouri.
Search Deals

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 June 12, 2025.

This Kiwi.com 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/169:50 amYYZ - MCI
1 stop8h 48mMultiple Airlines
Fri 9/197:22 pmMCI - YYZ
1 stop17h 43mMultiple Airlines
Deal found 6/11$331
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 9/2512:30 pmYUL - STL
1 stop8h 55mAmerican Airlines
Mon 9/295:55 amSTL - YUL
1 stop9h 35mAmerican Airlines
Deal found 6/11$333
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.
Sun 9/145:15 pmYUL - MCI
1 stop16h 18mAmerican Airlines
Thu 9/187:30 pmMCI - YUL
1 stop15h 15mAmerican Airlines
Deal found 6/11$335
This Mytrip deal was found by Cheapflights users on 6/12. 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 7/226:30 amYYZ - STL
1 stop11h 01mMultiple Airlines
Thu 7/2410:47 amSTL - YYZ
2 stops33h 36mMultiple Airlines
Deal found 6/12$337
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.
Mon 6/237:25 pmYYZ - STL
1 stop5h 34mAmerican Airlines
Thu 6/266:00 amSTL - YYZ
1 stop3h 59mAmerican Airlines
Deal found 6/10$339
This Booking.com 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/2611:30 amYYZ - STL
Nonstop2h 06mAir Canada
Sun 6/291:30 pmSTL - YYZ
1 stop15h 55mAir Canada
Deal found 6/11$344
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 6/202:27 pmYYZ - STL
1 stop7h 26mDelta
Sun 6/227:00 amSTL - YYZ
1 stop9h 06mDelta
Deal found 6/10$361
This United Airlines deal was found by Cheapflights users on 6/12. 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.
Mon 10/69:00 amYYZ - STL
1 stop26h 49mUnited Airlines
Thu 10/912:25 pmSTL - YYZ
1 stop7h 37mUnited Airlines
Deal found 6/12$363
This American Airlines deal was found by Cheapflights users on 6/12. 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 8/281:16 pmYYZ - MCI
1 stop8h 32mAmerican Airlines
Tue 9/25:39 amMCI - YYZ
1 stop7h 53mAmerican Airlines
Deal found 6/12$366
This Trip.com 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/27:00 amYOW - MCI
2 stops16h 01mMultiple Airlines
Tue 7/86:05 amMCI - YOW
1 stop10h 01mMultiple Airlines
Deal found 6/10$379
This Mytrip deal was found by Cheapflights users on 6/12. 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 7/101:10 pmYUL - STL
2 stops21h 42mMultiple Airlines
Thu 7/1710:47 amSTL - YUL
3 stops26h 03mMultiple Airlines
Deal found 6/12$393
This Mytrip deal was found by Cheapflights users on 6/12. 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 9/1812:00 pmYYZ - SGF
3 stops34h 05mMultiple Airlines
Mon 9/2210:05 pmSGF - YYZ
3 stops31h 47mMultiple Airlines
Deal found 6/12$399

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 June 12, 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

TorontoKansas City

YYZ - MCI

YYZMCI

Toronto Pearson Intl

Tue 9/16

9:50 am-5:38 pm

1 stop8h 48m

Kansas City

Fri 9/19

7:22 pm-2:05 pm

1 stop17h 43m

$331

MontrealSt. Louis

YUL - STL

YULSTL

Montreal Pierre Elliott Trudeau Intl

Thu 9/25

12:30 pm-8:25 pm

1 stop8h 55m

Lambert-St Louis

Mon 9/29

5:55 am-4:30 pm

1 stop9h 35m

$333

MontrealKansas City

YUL - MCI

YULMCI

Montreal Pierre Elliott Trudeau Intl

Sun 9/14

5:15 pm-8:33 am

1 stop16h 18m

Kansas City

Thu 9/18

7:30 pm-11:45 am

1 stop15h 15m

$335

TorontoSt. Louis

YYZ - STL

YYZSTL

Toronto Pearson Intl

Tue 7/22

6:30 am-4:31 pm

1 stop11h 01m

Lambert-St Louis

Thu 7/24

10:47 am-9:23 pm

2 stops33h 36m

$337

TorontoSt. Louis

YYZ - STL

YYZSTL

Toronto Pearson Intl

Mon 6/23

7:25 pm-11:59 pm

1 stop5h 34m

Lambert-St Louis

Thu 6/26

6:00 am-10:59 am

1 stop3h 59m

$339

TorontoSt. Louis

YYZ - STL

YYZSTL

Toronto Pearson Intl

Thu 6/26

11:30 am-12:36 pm

Nonstop2h 06m

Lambert-St Louis

Sun 6/29

1:30 pm-6:25 am

1 stop15h 55m

$344

TorontoSt. Louis

YYZ - STL

YYZSTL

Toronto Pearson Intl

Thu 6/26

10:20 am-3:17 pm

1 stop5h 57m

Lambert-St Louis

Sun 6/29

6:40 am-11:18 am

1 stop3h 38m

$361

TorontoSt. Louis

YYZ - STL

YYZSTL

Toronto Pearson Intl

Mon 10/6

9:00 am-10:49 am

1 stop26h 49m

Lambert-St Louis

Thu 10/9

12:25 pm-9:02 pm

1 stop7h 37m

$363

TorontoKansas City

YYZ - MCI

YYZMCI

Toronto Pearson Intl

Thu 8/28

1:16 pm-8:48 pm

1 stop8h 32m

Kansas City

Tue 9/2

5:39 am-2:32 pm

1 stop7h 53m

$366

OttawaKansas City

YOW - MCI

YOWMCI

Ottawa

Wed 7/2

7:00 am-10:01 pm

2 stops16h 01m

Kansas City

Tue 7/8

6:05 am-5:06 pm

1 stop10h 01m

$379

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/11

Showing 1-10 of 55 results
1
2
3
...
6

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 June 12, 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.

Weekly flight availability from Region of Ontario to Missouri

Explore weekly flight availability from Ontario to Missouri. 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 CAON to USMO are scheduled on a Wednesday (4 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (3 on average).

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 June 12, 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
10,000 reviews

Crew

8.5

Overall

8.0

Boarding

8.1

Comfort

7.8

Food

7.1

Entertainment

7.1

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
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Crew

8.5

Overall

8.0

Boarding

8.1

Comfort

7.8

Food

7.1

Entertainment

7.1

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
7,946 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Crew

8.5

Overall

8.0

Boarding

8.1

Comfort

7.8

Food

7.1

Entertainment

7.1

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
8,790 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Crew

8.5

Overall

8.0

Boarding

8.1

Comfort

7.8

Food

7.1

Entertainment

7.1

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
10,000 reviews

Crew

8.5

Overall

8.0

Boarding

8.1

Comfort

7.8

Food

7.1

Entertainment

7.1

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
2,868 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Crew

8.5

Overall

8.0

Boarding

8.1

Comfort

7.8

Food

7.1

Entertainment

7.1

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 $188. American Airlines flights start at $198 while deals on United Airlines start at $220 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

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Ontario to Missouri

See prices for flight routes from nearby airports that may be better suited for you.
Pearson Intl to Newark flights
Pearson Intl to John F Kennedy Intl flights
Toronto Island to Newark flights
Pearson Intl to LaGuardia flights
Pearson Intl to Los Angeles flights
Pearson Intl to Fort Lauderdale flights
Pearson Intl to Las Vegas flights
Pierre Elliott Trudeau Intl to Fort Lauderdale flights
Pierre Elliott Trudeau Intl to LaGuardia flights
Pierre Elliott Trudeau Intl to John F Kennedy Intl flights
Vancouver Intl to Los Angeles flights
Pearson Intl to Miami flights
Pearson Intl to Orlando flights
Pearson Intl to San Francisco flights
Vancouver Intl to Las Vegas flights
Pierre Elliott Trudeau Intl to Newark flights
Vancouver Intl to Seattle flights
Pearson Intl to Seattle flights
Vancouver Intl to John F Kennedy Intl flights
Vancouver Intl to Newark flights
Pearson Intl to Dallas/Fort Worth flights
Pearson Intl to Boston flights
Pearson Intl to O'Hare Intl flights
Pearson Intl to Hobby flights
Pierre Elliott Trudeau Intl to Miami flights
Vancouver Intl to San Francisco flights
Pierre Elliott Trudeau Intl to Los Angeles flights
Pearson Intl to George Bush Intcntl flights
Pierre Elliott Trudeau Intl to Orlando flights
Toronto Island to Fort Lauderdale flights
Vancouver Intl to San Diego flights
Vancouver Intl to LaGuardia flights
Vancouver Intl to Honolulu flights
Vancouver Intl to O'Hare Intl flights
Pearson Intl to Reagan-National flights
Pierre Elliott Trudeau Intl to Las Vegas flights
Toronto Island to Boston flights
Pearson Intl to Atlanta flights
Pearson Intl to Dulles Intl flights
Toronto Island to Midway flights
Vancouver Intl to Boston flights
Vancouver Intl to Sky Harbor Intl flights
Pierre Elliott Trudeau Intl to Boston flights
Pearson Intl to Nashville flights
Vancouver Intl to Miami flights
Pierre Elliott Trudeau Intl to San Francisco flights
Toronto Island to Orlando flights
Pearson Intl to Tampa flights
Pearson Intl to Denver flights
Vancouver Intl to Santa Ana flights

Top 4 airlines flying from Ontario to Missouri

Discover the top 4 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 June 12, 2025.
AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapest$324Average$464FlexibilityNo cancel feeOn-time67%
United AirlinesCheapest$371Average$519FlexibilityNo cancel feeOn-time69%
DeltaCheapest$400Average$505FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$421Average$550FlexibilityNo cancel feeOn-time71%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.