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$99+ 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 2/16. Fares are subject to change and may not be available on all flights or dates of travel.
STL — YYZ
Feb 19 — Feb 261
Thu 2/19
Thu 2/26
1 adult, Economy
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Cheap 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 January 20, 2026.

This Kiwi.com deal was found by Cheapflights users on 1/19. 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 3/33:49 pm
STL
-
YYZ
1 stop21h 31m
Multiple Airlines
Tue 3/178:20 pm
YYZ
-
STL
1 stop12h 17m
Multiple Airlines
Deal found 1/19$288
This Kiwi.com deal was found by Cheapflights users on 1/18. 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.
Sun 2/85:42 pm
STL
-
YYZ
1 stop16h 44m
Multiple Airlines
Sun 3/83:40 pm
YYZ
-
STL
2 stops22h 39m
Multiple Airlines
Deal found 1/18$343
This Kiwi.com deal was found by Cheapflights users on 1/19. 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 4/84:54 pm
STL
-
YYZ
2 stops26h 16m
Multiple Airlines
Sun 4/128:20 pm
YYZ
-
STL
1 stop12h 31m
Multiple Airlines
Deal found 1/19$346
This Kiwi.com deal was found by Cheapflights users on 1/18. 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 2/2311:26 am
MCI
-
YYZ
1 stop23h 02m
Multiple Airlines
Wed 2/257:10 am
YYZ
-
MCI
1 stop9h 19m
Multiple Airlines
Deal found 1/18$346
This United Airlines deal was found by Cheapflights users on 1/19. 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 2/212:35 pm
MCI
-
YOW
1 stop5h 17m
United Airlines
Fri 2/69:45 am
YOW
-
MCI
1 stop6h 25m
United Airlines
Deal found 1/19$370
This United Airlines deal was found by Cheapflights users on 1/18. 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 2/212:44 pm
STL
-
YOW
1 stop5h 08m
United Airlines
Fri 2/65:11 pm
YOW
-
STL
1 stop6h 47m
United Airlines
Deal found 1/18$370
This Kiwi.com deal was found by Cheapflights users on 1/18. 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.
Thu 3/129:50 am
STL
-
YYZ
2 stops10h 19m
Multiple Airlines
Wed 3/188:20 pm
YYZ
-
STL
1 stop11h 42m
Multiple Airlines
Deal found 1/18$376
This Kiwi.com deal was found by Cheapflights users on 1/19. 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.
Sun 3/13:49 pm
STL
-
YUL
1 stop7h 41m
Multiple Airlines
Thu 3/56:45 am
YUL
-
STL
2 stops25h 17m
Multiple Airlines
Deal found 1/19$384
This Kiwi.com deal was found by Cheapflights users on 1/19. 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.
Thu 3/511:26 am
MCI
-
YYZ
1 stop10h 54m
Multiple Airlines
Thu 3/128:00 am
YYZ
-
MCI
2 stops40h 31m
Multiple Airlines
Deal found 1/19$388
This Kiwi.com deal was found by Cheapflights users on 1/18. 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 2/146:41 pm
STL
-
YYZ
1 stop10h 39m
Multiple Airlines
Sat 2/213:40 pm
YYZ
-
STL
2 stops40h 11m
Multiple Airlines
Deal found 1/18$390
This Kiwi.com deal was found by Cheapflights users on 1/18. 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.
Thu 2/511:26 am
MCI
-
YYZ
1 stop10h 54m
Multiple Airlines
Sun 2/83:40 pm
YYZ
-
MCI
1 stop19h 51m
Multiple Airlines
Deal found 1/18$390
This Kiwi.com deal was found by Cheapflights users on 1/18. 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 2/1310:11 pm
STL
-
YYZ
2 stops20h 25m
Multiple Airlines
Sun 2/228:20 pm
YYZ
-
STL
1 stop28h 39m
Multiple Airlines
Deal found 1/18$393

Find flight deals from Missouri to Ontario

Keep the following information in mind while searching for Missouri to Ontario flight deals. Data was last updated January 20, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

Expedia
3 stars

Round-trip from

$237
(Kiwi.com)

One-way from

$99
(Trip.com)

Popular in

November

Cheapest in

April

Average price

$532

Good round-trip deal

$648 or less

Good one-way deal

$271 or less
Provider with most accurate pricing for Lambert-St Louis-Toronto (YTO) flight deals.
Search Deals
Provider most trusted by Cheapflights users for Lambert-St Louis-Toronto (YTO) flights.
Search Deals
From Missouri to Ontario
Search Deals
One-way flight from Missouri to Ontario
Search Deals
Highest demand for flights based on searches. 12% potential increase in price ($69 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($17 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in January 2026
Search Deals
Price to beat on a round-trip flight from Missouri to Ontario.
Search Deals
Price to beat on a one-way flight from Missouri to Ontario.
Search Deals

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 January 20, 2026.
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

Sun 2/8

5:42 pm-11:26 am

1 stop16h 44m

Toronto Pearson Intl

Sun 3/8

3:40 pm-1:19 pm

2 stops22h 39m

$343

St. LouisToronto

STL - YYZ

STLYYZ

Lambert-St Louis

Wed 4/8

4:54 pm-8:10 pm

2 stops26h 16m

Toronto Pearson Intl

Sun 4/12

8:20 pm-7:51 am

1 stop12h 31m

$346

Kansas CityToronto

MCI - YYZ

MCIYYZ

Kansas City

Mon 2/23

11:26 am-11:28 am

1 stop23h 02m

Toronto Pearson Intl

Wed 2/25

7:10 am-3:29 pm

1 stop9h 19m

$346

Kansas CityOttawa

MCI - YOW

MCIYOW

Kansas City

Mon 2/2

11:29 am-9:18 pm

1 stop8h 49m

Ottawa

Fri 2/6

9:45 am-3:10 pm

1 stop6h 25m

$370

Kansas CityOttawa

MCI - YOW

MCIYOW

Kansas City

Thu 5/7

6:17 am-1:59 pm

1 stop6h 42m

Ottawa

Sat 5/9

6:25 am-10:33 am

1 stop5h 08m

$370

St. LouisOttawa

STL - YOW

STLYOW

Lambert-St Louis

Mon 2/2

1:15 pm-9:18 pm

1 stop7h 03m

Ottawa

Fri 2/6

5:55 pm-11:59 pm

1 stop7h 04m

$370

St. LouisOttawa

STL - YOW

STLYOW

Lambert-St Louis

Tue 2/17

7:41 am-5:07 pm

1 stop8h 26m

Ottawa

Tue 2/24

5:11 pm-9:05 pm

1 stop4h 54m

$370

St. LouisOttawa

STL - YOW

STLYOW

Lambert-St Louis

Wed 3/4

7:00 am-1:34 pm

1 stop5h 34m

Ottawa

Wed 3/11

5:55 pm-11:51 pm

1 stop6h 56m

$370

St. LouisOttawa

STL - YOW

STLYOW

Lambert-St Louis

Thu 3/5

7:41 am-5:12 pm

1 stop8h 31m

Ottawa

Thu 3/12

5:55 pm-11:51 pm

1 stop6h 56m

$370

Kansas CityToronto

MCI - YYZ

MCIYYZ

Kansas City

Thu 3/5

11:26 am-11:20 pm

1 stop10h 54m

Toronto Pearson Intl

Thu 3/12

8:00 am-11:31 pm

2 stops40h 31m

$388

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/19

Showing 1-10 of 55 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, June is the cheapest month in which you can book a flight from Missouri to Region of Ontario (average of $177). Flying from Missouri to Region of Ontario in January is currently the most expensive (average of $781). 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 January 20, 2026.

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.

How much does it cost to fly round-trip from Missouri to Region of Ontario?

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 January 20, 2026.
See what other customers who have flown with Delta, United Airlines, and American 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.
Delta
7.9
Good
8,079 reviews

Comfort

7.9

Boarding

8.1

Food

7.2

Entertainment

7.8

Crew

8.5

Overall

7.9

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.
Delta
7.9
Good
8,079 reviews
Delta
7.9
Good
8,079 reviews

Comfort

7.9

Boarding

8.1

Food

7.2

Entertainment

7.8

Crew

8.5

Overall

7.9

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.
United Airlines
7.4
Good
9,183 reviews
Delta
7.9
Good
8,079 reviews

Comfort

7.9

Boarding

8.1

Food

7.2

Entertainment

7.8

Crew

8.5

Overall

7.9

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.
American Airlines
7.2
Good
11,166 reviews
Delta
7.9
Good
8,079 reviews

Comfort

7.9

Boarding

8.1

Food

7.2

Entertainment

7.8

Crew

8.5

Overall

7.9

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.
WestJet
7.2
Good
3,247 reviews
Delta
7.9
Good
8,079 reviews

Comfort

7.9

Boarding

8.1

Food

7.2

Entertainment

7.8

Crew

8.5

Overall

7.9

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.
Air Canada
7.1
Good
10,637 reviews
Delta
7.9
Good
8,079 reviews

Comfort

7.9

Boarding

8.1

Food

7.2

Entertainment

7.8

Crew

8.5

Overall

7.9

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.

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.

  • How long is the flight from Missouri to Region of Ontario?

    A quick flight from Missouri to Region of Ontario can take about 8h 49m. United Airlines provides one of the quickest options available for as low as $370. The distance from Missouri to Region of Ontario is about 1055 mi. This flight may include one or multiple stops.

  • 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 $162. However, be on the lookout for offers from Air Canada 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, June is the cheapest month in which you can book a flight from Missouri to Region of Ontario (average of $177). Flying from Missouri to Region of Ontario in January is currently the most expensive (average of $781). 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 January 20, 2026.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$199Average$685FlexibilityNo cancel feeOn-time69%
Air CanadaCheapest$214Average$651FlexibilityNo cancel feeOn-time67%
American AirlinesCheapest$270Average$603FlexibilityNo cancel feeOn-time71%
DeltaCheapest$423Average$722FlexibilityNo cancel feeOn-timeN/A
WestJetCheapest$663Average$748FlexibilityNo cancel feeOn-time60%

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