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Cheap flights from Ontario to Missouri from $184

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Ontario to Missouri departing on 9/27. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
1 adult, Economy, 0 bags

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from Ontario to Missouri

Cheap round-trip flights

Enter your travel dates to find the best prices.
American Airlines Logo
2:15 pm - 9:37 pmYYZ  Toronto Pearson Intl-STL Lambert-St Louis
8h 22m1 stop Washington, D.C. Reagan-National
American Airlines Logo
7:21 am - 6:35 pmSTL  Lambert-St Louis-YYZ Toronto Pearson Intl
10h 14m1 stop Chicago O'Hare Intl
$372American Airlines
Tue, Sep 8 - Fri, Sep 11
American Airlines Logo
2:15 pm - 9:37 pmYYZ  Toronto Pearson Intl-STL Lambert-St Louis
8h 22m1 stop Washington, D.C. Reagan-National
American Airlines Logo
7:21 am - 6:35 pmSTL  Lambert-St Louis-YYZ Toronto Pearson Intl
10h 14m1 stop Chicago O'Hare Intl
$373American Airlines
Tue, Sep 8 - Fri, Sep 11
Multiple Airlines Logo
1:30 pm - 1:10 pmYYZ  Toronto Pearson Intl-STL Lambert-St Louis
24h 40m2 stops Fort Lauderdale Atlanta Hartsfield-Jackson
Multiple Airlines Logo
12:17 pm - 8:09 pmSTL  Lambert-St Louis-YYZ Toronto Pearson Intl
30h 52m1 stop Las Vegas Harry Reid Intl
$380Multiple Airlines
Thu, Sep 10 - Tue, Sep 15
Multiple Airlines Logo
9:30 am - 1:22 pmYYZ  Toronto Pearson Intl-MCI Kansas City
28h 52m2 stops Phoenix Sky Harbor Intl Denver Intl
Multiple Airlines Logo
9:16 am - 7:05 pmMCI  Kansas City-YYZ Toronto Pearson Intl
8h 49m1 stop Fort Lauderdale
$391Multiple Airlines
Tue, Oct 20 - Mon, Oct 26
Delta Logo
1:34 pm - 8:18 pmYYZ  Toronto Pearson Intl-MCI Kansas City
7h 44m1 stop Atlanta Hartsfield-Jackson
Delta Logo
10:32 am - 5:19 pmMCI  Kansas City-YYZ Toronto Pearson Intl
5h 47m1 stop Detroit Metropolitan Wayne County
$403Delta
Wed, Oct 28 - Sat, Oct 31
Delta Logo
6:00 am - 2:54 pmYYZ  Toronto Pearson Intl-MCI Kansas City
9h 54m1 stop Atlanta Hartsfield-Jackson
Delta Logo
6:30 am - 11:18 amMCI  Kansas City-YYZ Toronto Pearson Intl
3h 48m1 stop Detroit Metropolitan Wayne County
$403Delta
Sat, Sep 5 - Sat, Sep 12
United Airlines Logo
9:45 am - 3:53 pmYUL  Montreal Pierre Elliott Trudeau Intl-MCI Kansas City
7h 08m1 stop Chicago O'Hare Intl
United Airlines Logo
6:00 am - 4:10 pmMCI  Kansas City-YUL Montreal Pierre Elliott Trudeau Intl
9h 10m2 stops Chicago O'Hare Intl Newark
$407United Airlines
Sat, Oct 10 - Wed, Oct 14
United Airlines Logo
9:45 am - 3:53 pmYUL  Montreal Pierre Elliott Trudeau Intl-MCI Kansas City
7h 08m1 stop Chicago O'Hare Intl
United Airlines Logo
6:29 am - 10:06 pmMCI  Kansas City-YUL Montreal Pierre Elliott Trudeau Intl
14h 37m1 stop Newark
$407United Airlines
Sat, Oct 10 - Wed, Oct 14
Air Canada Logo
12:55 pm - 2:00 pmYYZ  Toronto Pearson Intl-STL Lambert-St Louis
2h 05mnonstop
Air Canada Logo
8:55 am - 11:49 amSTL  Lambert-St Louis-YYZ Toronto Pearson Intl
1h 54mnonstop
$450Air Canada
Wed, Sep 9 - Thu, Sep 10
Air Canada Logo
12:55 pm - 2:00 pmYYZ  Toronto Pearson Intl-STL Lambert-St Louis
2h 05mnonstop
Air Canada Logo
4:05 pm - 7:05 pmSTL  Lambert-St Louis-YYZ Toronto Pearson Intl
2h 00mnonstop
$451Air Canada
Tue, Oct 20 - Tue, Oct 27

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American Airlines flights from Region of Ontario to Missouri

Our best American Airlines deals on Region of Ontario to Missouri flight tickets
American Airlines
Sep 8
YYZ2:15 pmToronto Pearson Intl
8h 22m
1 stop
STL9:37 pmLambert-St Louis
Sep 11
STL7:21 amLambert-St Louis
10h 14m
1 stop
YYZ6:35 pmToronto Pearson Intl
$372
American Airlines
Sep 8
YYZ2:15 pmToronto Pearson Intl
8h 22m
1 stop
STL9:37 pmLambert-St Louis
Sep 11
STL7:21 amLambert-St Louis
10h 14m
1 stop
YYZ6:35 pmToronto Pearson Intl
$373
American Airlines
Sep 8
YYZ7:20 amToronto Pearson Intl
10h 00m
1 stop
STL4:20 pmLambert-St Louis
Sep 11
STL7:21 amLambert-St Louis
10h 14m
1 stop
YYZ6:35 pmToronto Pearson Intl
$381

Air Canada flights from Region of Ontario to Missouri

Our best Air Canada deals on Region of Ontario to Missouri flight tickets
Air Canada
Sep 9
YYZ12:55 pmToronto Pearson Intl
2h 05m
STL2:00 pmLambert-St Louis
Sep 10
STL8:55 amLambert-St Louis
1h 54m
YYZ11:49 amToronto Pearson Intl
$450
Air Canada
Sep 8
YYZ7:15 pmToronto Pearson Intl
2h 05m
STL8:20 pmLambert-St Louis
Sep 11
STL8:55 amLambert-St Louis
1h 54m
YYZ11:49 amToronto Pearson Intl
$451
Air Canada
Sep 24
YOW2:45 pmOttawa
4h 56m
1 stop
STL6:41 pmLambert-St Louis
Oct 1
STL8:55 amLambert-St Louis
5h 15m
1 stop
YOW3:10 pmOttawa
$452

momondo Fare Finder

 
Customize your flight search to find flights from Region of 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, momondo users made 832,500 searches. Data last updated August 14, 2026.
Use the filters below to find and compare flights from Ontario to Missouri that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

TorontoSt. Louis

YYZ Toronto Pearson Intl - STL Lambert-St Louis

YYZSTL

Toronto Pearson Intl

Tue 9/8

2:15 pm-9:37 pm

1 stop8h 22m

Lambert-St Louis

Fri 9/11

7:21 am-6:35 pm

1 stop10h 14m

$372

TorontoSt. Louis

YYZ Toronto Pearson Intl - STL Lambert-St Louis

YYZSTL

Toronto Pearson Intl

Tue 9/8

2:15 pm-9:37 pm

1 stop8h 22m

Lambert-St Louis

Fri 9/11

7:21 am-6:35 pm

1 stop10h 14m

$373

TorontoSt. Louis

YYZ Toronto Pearson Intl - STL Lambert-St Louis

YYZSTL

Toronto Pearson Intl

Thu 9/10

1:30 pm-1:10 pm

2 stops24h 40m

Lambert-St Louis

Tue 9/15

12:17 pm-8:09 pm

1 stop30h 52m

$380

TorontoKansas City

YYZ Toronto Pearson Intl - MCI Kansas City

YYZMCI

Toronto Pearson Intl

Tue 10/20

9:30 am-1:22 pm

2 stops28h 52m

Kansas City

Mon 10/26

9:16 am-7:05 pm

1 stop8h 49m

$391

TorontoKansas City

YYZ Toronto Pearson Intl - MCI Kansas City

YYZMCI

Toronto Pearson Intl

Wed 10/28

1:34 pm-8:18 pm

1 stop7h 44m

Kansas City

Sat 10/31

10:32 am-5:19 pm

1 stop5h 47m

$403

TorontoKansas City

YYZ Toronto Pearson Intl - MCI Kansas City

YYZMCI

Toronto Pearson Intl

Sat 9/5

6:00 am-2:54 pm

1 stop9h 54m

Kansas City

Sat 9/12

6:30 am-11:18 am

1 stop3h 48m

$403

MontrealKansas City

YUL Montreal Pierre Elliott Trudeau Intl - MCI Kansas City

YULMCI

Montreal Pierre Elliott Trudeau Intl

Sat 10/10

9:45 am-3:53 pm

1 stop7h 08m

Kansas City

Wed 10/14

6:00 am-4:10 pm

2 stops9h 10m

$407

MontrealKansas City

YUL Montreal Pierre Elliott Trudeau Intl - MCI Kansas City

YULMCI

Montreal Pierre Elliott Trudeau Intl

Sat 10/10

9:45 am-3:53 pm

1 stop7h 08m

Kansas City

Wed 10/14

6:29 am-10:06 pm

1 stop14h 37m

$407
Quickest round-trip

TorontoSt. Louis

YYZ Toronto Pearson Intl - STL Lambert-St Louis

YYZSTL

Toronto Pearson Intl

Wed 9/9

12:55 pm-2:00 pm

Nonstop2h 05m

Lambert-St Louis

Thu 9/10

8:55 am-11:49 am

Nonstop1h 54m

$450

TorontoSt. Louis

YYZ Toronto Pearson Intl - STL Lambert-St Louis

YYZSTL

Toronto Pearson Intl

Tue 10/20

12:55 pm-2:00 pm

Nonstop2h 05m

Lambert-St Louis

Tue 10/27

4:05 pm-7:05 pm

Nonstop2h 00m

$451

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to Missouri from

How to get the cheapest flight ticket from Region of Ontario to Missouri

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest month to fly to Missouri?

In general, January is the cheapest month to fly from Region of Ontario to Missouri. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $421. If you aren’t able to travel to Missouri during the month of January, then flying in February is also cheap. Prices for this month can be found on momondo for an average of $447.

What is the cheapest day to depart on your flight to Missouri?

The cheapest day to depart from Region of Ontario to Missouri is on a Sunday when prices can be found for as low as $394. Flights from Region of Ontario to Missouri on a Monday will generally be more expensive and average around $548. Keep in mind that these prices on both days could fluctuate depending on the season and the demand.

What is the cheapest time of day to depart on your flight to Missouri?

According to our data, the cheapest time of day to fly to Missouri is at noon. momondo users have found flights departing from Region of Ontario to Missouri at noon for as low as $418. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. Flights to Missouri are more costly in the evening, with an average ticket price of $584. Departure times in the evening fall within the peak daily travel times, which is why tickets can be more expensive.

What is the cheapest Ontario to Missouri flight route?

Fly from Toronto Pearson Intl to Lambert-St Louis for the best Ontario - Missouri flight prices

How far in advance should I book a flight from Ontario to Missouri?

You are more likely to see cheaper flights to Missouri from Region of Ontario when booking weeks ahead of your departure date. In general, you can expect to find flights to Missouri for around $511 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Missouri from Region of Ontario for as low as $359 on momondo.

What cabin class options are available on Region of Ontario to Missouri flights?

There are 4 cabin classes available to choose from on Region of Ontario to Missouri flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Can stopping save me money on Region of Ontario to Missouri flights?

You could potentially save up to 3% on your flight if you consider stops on a Region of Ontario to Missouri flight.

Cheap Region of Ontario to Missouri flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Region of Ontario to Missouri

Fastest flight time

2h 05m

Direct flights

Every day

Airports in Missouri

55 airports
The fastest flight from Region of Ontario to Missouri takes 2h 05m
Direct flights go from Region of Ontario to Missouri every day.
There are 55 airports in Missouri. From Region of Ontario there are direct flights to Lambert-St Louis (STL).
Search flight deals

Frequently asked questions about flying from Ontario to Missouri

  • When did momondo last update prices for flights from Ontario to Missouri?

    Prices for flights from Ontario to Missouri were last updated today.

  • How many operators does momondo search for flights from Ontario to Missouri?

  • How old do you have to be to fly from Ontario to Missouri?

    The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Ontario to Missouri.

  • What documentation or ID do you need to fly to Missouri?

    The required travel and health documents for your Missouri trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Missouri. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

  • What is the most popular plane model from Region of Ontario to Missouri?

Best airlines flying from Region of Ontario to Missouri

Compare and see reviews for airlines that fly from Region of Ontario to Missouri with momondo
Airline
Rating
Free Cancellation
Price
United AirlinesPriceFrom $226Free CancellationRating
7.4
10,108 reviews
Search United Airlines flights
Air CanadaPriceFrom $256Free CancellationRating
7.1
11,471 reviews
Search Air Canada flights
DeltaPriceFrom $443Free CancellationRating
7.8
8,501 reviews
Search Delta flights
American AirlinesPriceFrom $450Free CancellationRating
7.1
11,927 reviews
Search American Airlines flights
WestJetPriceFrom $530Free CancellationRating
7.2
3,432 reviews
Search WestJet flights

Why use momondo?

Why should I use momondo to find a flight deal from Ontario to Missouri?

momondo compares prices from hundreds of airlines and agents so you can find and book the best deal on flights from Ontario to Missouri. Millions of users trust and use momondo every year so you are in good hands.

Can I find flights from Ontario to Missouri with flexible booking policies on momondo?

Yes. momondo enables you to select and highlight flights to Missouri from Ontario with this policy.

How can momondo help me find flights from Ontario to Missouri?

momondo helps you find the best flight between Ontario and Missouri by providing filters to narrow your choice of flights to those matching your criteria. You can select flights based on numerous factors such as price, departure and landing times, airport and airline.

I’m not ready to book a flight from Ontario to Missouri right now. Can momondo alert me if prices change?

If you are simply researching potential flights to Missouri, momondo offers a useful price alert feature which will track prices for flights to Missouri from Ontario and alert you when they change.

An easier way to manage your Missouri trip

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