HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Missouri

$146+ 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 2/26. Fares are subject to change and may not be available on all flights or dates of travel.
YYZ — STL
Nov 29 — Dec 61
Sat 11/29
Sat 12/6
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 October 30, 2025.

Round-trip from

$242
(Kiwi.com)

One-way from

$146
(Kiwi.com)

Popular in

September

Cheapest in

June

Average price

$465

Good round-trip deal

$489 or less

Good one-way deal

$323 or less
From Ontario to Missouri
Search Deals
One-way flight from Ontario to Missouri
Search Deals
High demand for flights, 2% potential price rise
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($7 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in October 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 October 30, 2025.

This Kiwi.com deal was found by Cheapflights users on 10/28. 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 12/148:00 pmYYZ - MCI
1 stop28h 15mMultiple Airlines
Sun 1/111:44 pmMCI - YYZ
1 stop23h 36mMultiple Airlines
Deal found 10/28$290
This United Airlines deal was found by Cheapflights users on 10/28. 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.
Sat 12/137:30 pmYOW - MCI
2 stops16h 09mUnited Airlines
Mon 12/156:27 pmMCI - YOW
2 stops18h 09mUnited Airlines
Deal found 10/28$301
This American Airlines deal was found by Cheapflights users on 10/27. 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 12/911:36 amYYZ - STL
1 stop9h 48mAmerican Airlines
Wed 12/105:05 amSTL - YYZ
1 stop9h 58mAmerican Airlines
Deal found 10/27$306
This United deal was found by Cheapflights users on 10/29. 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 United is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/203:10 pmYOW - STL
1 stop9h 23mMultiple Airlines
Mon 1/54:05 pmSTL - YOW
1 stop6h 03mMultiple Airlines
Deal found 10/29$307
This Kiwi.com deal was found by Cheapflights users on 10/29. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/217:00 amYYZ - MCI
1 stop12h 36mMultiple Airlines
Fri 12/123:47 pmMCI - YYZ
1 stop18h 56mMultiple Airlines
Deal found 10/29$310
This Kiwi.com deal was found by Cheapflights users on 10/29. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/217:00 amYYZ - MCI
1 stop12h 36mMultiple Airlines
Fri 1/91:44 pmMCI - YYZ
1 stop21h 02mMultiple Airlines
Deal found 10/29$317
This Kiwi.com deal was found by Cheapflights users on 10/29. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/512:50 pmYYZ - STL
1 stop10h 43mMultiple Airlines
Sun 12/149:54 amSTL - YYZ
1 stop24h 49mMultiple Airlines
Deal found 10/29$319
This American Airlines deal was found by Cheapflights users on 10/28. 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.
Fri 12/56:00 amYYZ - STL
1 stop8h 14mAmerican Airlines
Mon 12/85:15 amSTL - YYZ
1 stop9h 48mAmerican Airlines
Deal found 10/28$320
This American Airlines deal was found by Cheapflights users on 10/28. 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.
Fri 12/261:14 pmYYZ - STL
1 stop11h 41mAmerican Airlines
Thu 1/86:00 amSTL - YYZ
1 stop9h 03mAmerican Airlines
Deal found 10/28$331
This Kiwi.com deal was found by Cheapflights users on 10/27. 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 11/265:15 pmYYZ - MCI
1 stop19h 48mMultiple Airlines
Wed 12/36:00 amMCI - YYZ
1 stop17h 11mMultiple Airlines
Deal found 10/27$332
This Kiwi.com deal was found by Cheapflights users on 10/27. 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 11/217:00 amYYZ - MCI
1 stop12h 36mMultiple Airlines
Fri 11/2812:58 pmMCI - YYZ
1 stop16h 22mMultiple Airlines
Deal found 10/27$347
This United Airlines deal was found by Cheapflights users on 10/29. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/205:59 pmYOW - STL
1 stop6h 34mUnited Airlines
Mon 1/56:35 pmSTL - YOW
2 stops18h 55mUnited Airlines
Deal found 10/29$354

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 October 30, 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

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

Fri 1/23

9:30 am-10:33 pm

1 stop14h 03m

Lambert-St Louis

Sun 1/25

5:11 pm-5:13 pm

1 stop23h 02m

$242

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

Fri 1/23

2:15 pm-10:58 pm

2 stops9h 43m

Lambert-St Louis

Sun 1/25

9:57 am-9:56 pm

2 stops10h 59m

$301

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

Tue 4/7

6:52 am-3:21 pm

1 stop9h 29m

Lambert-St Louis

Wed 4/8

8:30 am-4:15 pm

1 stop6h 45m

$301

OttawaKansas City

YOW - MCI

YOWMCI

Ottawa

Sat 12/13

7:30 pm-10:39 am

2 stops16h 09m

Kansas City

Mon 12/15

6:27 pm-1:36 pm

2 stops18h 09m

$301

OttawaKansas City

YOW - MCI

YOWMCI

Ottawa

Fri 12/12

6:20 am-10:39 am

1 stop5h 19m

Kansas City

Tue 12/16

6:00 am-9:56 pm

2 stops14h 56m

$301

OttawaKansas City

YOW - MCI

YOWMCI

Ottawa

Sun 4/5

6:00 am-11:22 am

1 stop6h 22m

Kansas City

Wed 4/8

6:00 am-4:15 pm

2 stops9h 15m

$301

TorontoKansas City

YYZ - MCI

YYZMCI

Toronto Pearson Intl

Fri 1/9

7:10 am-12:39 pm

1 stop30h 29m

Kansas City

Tue 1/13

7:00 am-7:55 pm

1 stop11h 55m

$302

TorontoSt. Louis

YYZ - STL

YYZSTL

Toronto Pearson Intl

Wed 1/21

11:30 am-6:14 pm

1 stop7h 44m

Lambert-St Louis

Sat 1/24

6:43 pm-10:53 am

1 stop15h 10m

$303

TorontoKansas City

YYZ - MCI

YYZMCI

Toronto Pearson Intl

Sun 12/14

8:00 pm-11:51 am

2 stops16h 51m

Kansas City

Sun 1/11

1:44 pm-2:20 pm

1 stop23h 36m

$305

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

Sat 12/20

3:10 pm-11:33 pm

1 stop9h 23m

Lambert-St Louis

Mon 1/5

4:05 pm-11:08 pm

1 stop6h 03m

$307

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/28

Showing 1-10 of 60 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, October is the cheapest month in which you can book a flight from Region of Ontario to Missouri (average of $300). Flying from Region of Ontario to Missouri in February is currently the most expensive (average of $401). 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 October 30, 2025.

Unlike in the afternoon, when flights are generally more expensive, you can save up to 25% on flights from Region of Ontario to Missouri by exploring options for tickets in the evening.

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 October 30, 2025.
Peruse reviews from past customers who have flown with Delta, United Airlines, and American Airlines from Ontario to Missouri to help guide your decision. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Delta
7.9
Good
7,992 reviews

Entertainment

7.9

Overall

7.9

Comfort

7.9

Food

7.3

Boarding

8.2

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Mary,Oct 2025

AMS - PDX

It's specail being able to fly non-stop from Amsterdam all the way home to Portland, Oregon!
Delta
7.9
Good
7,992 reviews
Delta
7.9
Good
7,992 reviews

Entertainment

7.9

Overall

7.9

Comfort

7.9

Food

7.3

Boarding

8.2

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Mary,Oct 2025

AMS - PDX

It's specail being able to fly non-stop from Amsterdam all the way home to Portland, Oregon!
United Airlines
7.4
Good
8,999 reviews
Delta
7.9
Good
7,992 reviews

Entertainment

7.9

Overall

7.9

Comfort

7.9

Food

7.3

Boarding

8.2

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Mary,Oct 2025

AMS - PDX

It's specail being able to fly non-stop from Amsterdam all the way home to Portland, Oregon!
American Airlines
7.2
Good
11,032 reviews
Delta
7.9
Good
7,992 reviews

Entertainment

7.9

Overall

7.9

Comfort

7.9

Food

7.3

Boarding

8.2

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Mary,Oct 2025

AMS - PDX

It's specail being able to fly non-stop from Amsterdam all the way home to Portland, Oregon!
Air Canada
7.1
Good
10,372 reviews
Delta
7.9
Good
7,992 reviews

Entertainment

7.9

Overall

7.9

Comfort

7.9

Food

7.3

Boarding

8.2

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Mary,Oct 2025

AMS - PDX

It's specail being able to fly non-stop from Amsterdam all the way home to Portland, Oregon!

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.

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

    United Airlines, American Airlines, and Delta can get you from Region of Ontario to Missouri in just under 7h 44m. Your travel time can differ by up to 2h 23m. The distance from Region of Ontario to Missouri is about 653 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

  • 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, October is the cheapest month in which you can book a flight from Region of Ontario to Missouri (average of $300). Flying from Region of Ontario to Missouri in February is currently the most expensive (average of $401). 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 John F Kennedy Intl flights
Pearson Intl to Newark flights
Toronto Island to Newark flights
Pierre Elliott Trudeau Intl to Fort Lauderdale flights
Pearson Intl to LaGuardia flights
Pearson Intl to Fort Lauderdale flights
Pierre Elliott Trudeau Intl to John F Kennedy Intl flights
Pierre Elliott Trudeau Intl to LaGuardia flights
Pearson Intl to Los Angeles flights
Pearson Intl to Miami flights
Pierre Elliott Trudeau Intl to Miami flights
Pearson Intl to Dallas/Fort Worth flights
Vancouver Intl to Los Angeles flights
Pearson Intl to Orlando flights
Pearson Intl to Las Vegas flights
Pierre Elliott Trudeau Intl to Newark flights
Vancouver Intl to Newark flights
Pearson Intl to San Francisco flights
Pierre Elliott Trudeau Intl to O'Hare Intl flights
Pearson Intl to Tampa flights
Pearson Intl to Hobby flights
Vancouver Intl to John F Kennedy Intl flights
Pearson Intl to O'Hare Intl flights
Toronto Island to Fort Lauderdale flights
Pierre Elliott Trudeau Intl to Los Angeles flights
Vancouver Intl to Honolulu flights
Toronto Island to Orlando flights
Pearson Intl to Reagan-National flights
Pearson Intl to George Bush Intcntl flights
Pearson Intl to Sky Harbor Intl flights
Pierre Elliott Trudeau Intl to Orlando flights
Vancouver Intl to Las Vegas flights
Vancouver Intl to San Francisco flights
Pearson Intl to Fort Myers flights
Toronto Island to Miami flights
Pearson Intl to Boston flights
Pearson Intl to Seattle flights
Vancouver Intl to LaGuardia flights
Pearson Intl to Atlanta flights
Pearson Intl to Nashville flights
Pearson Intl to Dulles Intl flights
Vancouver Intl to Miami flights
Pierre Elliott Trudeau Intl to Las Vegas flights
Vancouver Intl to Fort Lauderdale flights
Vancouver Intl to Santa Ana flights
Calgary to Las Vegas flights
Vancouver Intl to San Diego flights
Ottawa to Orlando flights
Vancouver Intl to Ontario flights
Toronto Island to Midway 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 October 30, 2025.
AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapest$324Average$486FlexibilityNo cancel feeOn-time67%
American AirlinesCheapest$421Average$545FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$422Average$649FlexibilityNo cancel feeOn-time69%
DeltaCheapest$472Average$588FlexibilityNo cancel feeOn-timeN/A

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.
Site
Cookie settings©2025 Cheapflights