What is the cheapest airline that flies from Missouri to Ontario?

Frontier, American Airlines, and United Airlines are the most popular carriers operating from Missouri to Ontario

How long does it take to fly to Ontario?

Average flight duration from Missouri to Ontario depends on which airport you fly into and out of. Flying from Kansas City to Los Angeles is 3h 25m on average, while flying from St. Louis to Los Angeles is 4h on average. Los Angeles is the most popular airport in Ontario.

What airlines fly to Ontario?

Southwest, American Airlines and Delta are the top three most popular airlines that fly to Ontario from Missouri according to our data. Southwest is the first choice among our users, with 41% of people opting to fly with this airline when traveling to Ontario. Keep in mind that there are 7 different airlines that fly to Ontario on a routine basis, so you have a few additional options to choose from.

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

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

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

There are 4 operators available for flights from Missouri to Ontario Airport as of October 2026.

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

The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Missouri to Ontario Airport.

What documentation or ID do you need to fly to Ontario Airport?

The travel and health documents required for your trip to Ontario Airport can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Ontario Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

$47 Cheap Flights from Missouri to Ontario in 2026/27

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Find the cheapest flights from Missouri to Los Angeles

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One-way

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Cheap round-trip flights

Enter your travel dates to find the best prices.

7:59 pm - 11:51 pmSTL Lambert-St Louis-ONT Ontario

5h 52m1 stop Denver Intl

6:25 am - 3:23 pmONT Ontario-STL Lambert-St Louis

6h 58m1 stop Denver Intl

$93Frontier

Sat, Oct 31 - Wed, Nov 4

7:59 pm - 11:51 pmSTL Lambert-St Louis-ONT Ontario

5h 52m1 stop Denver Intl

6:25 am - 3:23 pmONT Ontario-STL Lambert-St Louis

6h 58m1 stop Denver Intl

$98Frontier

Sat, Oct 31 - Wed, Nov 4

7:02 am - 1:16 pmSTL Lambert-St Louis-ONT Ontario

8h 14m1 stop Seattle/Tacoma Intl

6:25 am - 3:23 pmONT Ontario-STL Lambert-St Louis

6h 58m1 stop Denver Intl

$273Multiple Airlines

Tue, Oct 27 - Wed, Nov 4

8:43 pm - 11:51 pmMCI Kansas City-ONT Ontario

5h 08m1 stop Denver Intl

12:02 pm - 11:59 pmONT Ontario-MCI Kansas City

9h 57m1 stop Seattle/Tacoma Intl

$289Multiple Airlines

Tue, Oct 27 - Tue, Nov 3

5:11 pm - 11:13 pmCOU Columbia Regional-ONT Ontario

8h 02m1 stop Dallas/Fort Worth

6:00 am - 4:37 pmONT Ontario-COU Columbia Regional

8h 37m1 stop Dallas/Fort Worth

$348American Airlines

Thu, Jan 28 - Thu, Feb 4

5:11 pm - 11:46 pmCOU Columbia Regional-ONT Ontario

8h 35m1 stop Dallas/Fort Worth

6:00 am - 4:41 pmONT Ontario-COU Columbia Regional

8h 41m1 stop Dallas/Fort Worth

$348American Airlines

Fri, Nov 6 - Tue, Nov 10

6:20 am - 9:50 amSTL Lambert-St Louis-ONT Ontario

5h 30m1 stop Phoenix Sky Harbor Intl

4:00 pm - 12:15 amONT Ontario-STL Lambert-St Louis

6h 15m1 stop Phoenix Sky Harbor Intl

$352Southwest

Sat, Dec 12 - Thu, Dec 17

6:35 am - 12:50 pmSTL Lambert-St Louis-ONT Ontario

8h 15m2 stops Denver Intl Phoenix Sky Harbor Intl

4:00 pm - 12:15 amONT Ontario-STL Lambert-St Louis

6h 15m1 stop Phoenix Sky Harbor Intl

$362Southwest

Sat, Dec 12 - Thu, Dec 17

1:08 pm - 6:47 pmSTL Lambert-St Louis-ONT Ontario

7h 39m1 stop Chicago O'Hare Intl

5:00 am - 3:43 pmONT Ontario-STL Lambert-St Louis

8h 43m2 stops Denver Intl Chicago O'Hare Intl

$389United Airlines

Tue, Oct 27 - Wed, Nov 4

4:56 pm - 9:40 pmSGF Springfield-Branson-ONT Ontario

6h 44m1 stop Houston George Bush Intcntl

5:00 am - 12:41 pmONT Ontario-SGF Springfield-Branson

5h 41m1 stop Denver Intl

$389United Airlines

Fri, Nov 13 - Fri, Nov 27

Cheap last minute flights

Enter your travel dates to find the best prices.

12:17 pm - 4:59 pmSTL Lambert-St Louis-ONT Ontario

6h 42m1 stop Las Vegas Harry Reid Intl

6:15 am - 3:24 pmONT Ontario-STL Lambert-St Louis

7h 09m1 stop Denver Intl

$154Frontier

Tue, Oct 6 - Wed, Oct 21

12:17 pm - 9:09 amSTL Lambert-St Louis-ONT Ontario

22h 52m1 stop Las Vegas Harry Reid Intl

6:15 am - 3:24 pmONT Ontario-STL Lambert-St Louis

7h 09m1 stop Denver Intl

$286Frontier

Tue, Oct 6 - Wed, Oct 21

8:32 pm - 11:47 pmMCI Kansas City-ONT Ontario

5h 15m1 stop Denver Intl

6:15 am - 7:48 pmONT Ontario-MCI Kansas City

11h 33m1 stop Denver Intl

$325Frontier

Wed, Oct 7 - Mon, Oct 26

7:49 pm - 11:52 pmSGF Springfield-Branson-ONT Ontario

6h 03m1 stop Dallas/Fort Worth

2:22 pm - 11:56 pmONT Ontario-SGF Springfield-Branson

7h 34m1 stop Dallas/Fort Worth

$429American Airlines

Wed, Oct 7 - Wed, Oct 21

6:00 am - 9:35 amSGF Springfield-Branson-ONT Ontario

5h 35m1 stop Dallas/Fort Worth

11:59 pm - 10:08 amONT Ontario-SGF Springfield-Branson

8h 09m1 stop Dallas/Fort Worth

$429American Airlines

Thu, Oct 8 - Thu, Oct 29

4:53 pm - 9:59 pmSGF Springfield-Branson-ONT Ontario

7h 06m1 stop Houston George Bush Intcntl

5:00 am - 6:05 pmONT Ontario-SGF Springfield-Branson

11h 05m2 stops Denver Intl Chicago O'Hare Intl

$454United Airlines

Thu, Oct 8 - Thu, Oct 29

7:20 pm - 11:47 pmSTL Lambert-St Louis-ONT Ontario

30h 27m3 stops Jonesboro Nashville Intl Denver Intl

6:15 am - 3:24 pmONT Ontario-STL Lambert-St Louis

7h 09m1 stop Denver Intl

$492Multiple Airlines

Tue, Oct 6 - Wed, Oct 21

7:20 pm - 11:47 pmSTL Lambert-St Louis-ONT Ontario

30h 27m3 stops Jonesboro Nashville Intl Denver Intl

6:15 am - 11:31 amONT Ontario-STL Lambert-St Louis

27h 16m2 stops Denver Intl Las Vegas Harry Reid Intl

$536Multiple Airlines

Tue, Oct 6 - Wed, Oct 21

5:30 am - 12:18 pmSGF Springfield-Branson-ONT Ontario

8h 48m2 stops Denver Intl San Francisco

1:32 pm - 9:01 pmONT Ontario-SGF Springfield-Branson

5h 29m1 stop Denver Intl

$550United Airlines

Thu, Oct 8 - Mon, Oct 26

11:45 am - 3:40 pmMCI Kansas City-ONT Ontario

5h 55m1 stop Las Vegas Harry Reid Intl

7:05 am - 3:50 pmONT Ontario-MCI Kansas City

6h 45m2 stops Sacramento Intl Denver Intl

$578Southwest

Wed, Oct 7 - Tue, Oct 13

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Frontier flights from Missouri to Ontario

Our best Frontier deals on Missouri to Ontario flight tickets

Frontier

Oct 31

STL7:59 pmLambert-St Louis

5h 52m

1 stop

ONT11:51 pmOntario

Nov 4

ONT6:25 amOntario

6h 58m

1 stop

STL3:23 pmLambert-St Louis

$93

Frontier

Oct 31

STL7:59 pmLambert-St Louis

5h 52m

1 stop

ONT11:51 pmOntario

Nov 4

ONT6:25 amOntario

6h 58m

1 stop

STL3:23 pmLambert-St Louis

$98

Frontier

Nov 13

MCI8:43 pmKansas City

15h 59m

1 stop

ONT10:42 amOntario

Nov 16

ONT6:25 amOntario

11h 22m

1 stop

MCI7:47 pmKansas City

$136

Delta flights from Missouri to Ontario

Our best Delta deals on Missouri to Ontario flight tickets

Delta

Oct 22

SGF3:25 pmSpringfield-Branson

8h 29m

1 stop

ONT9:54 pmOntario

Oct 28

ONT12:16 pmOntario

8h 03m

1 stop

SGF10:19 pmSpringfield-Branson

$419

Delta

Oct 13

SGF3:25 pmSpringfield-Branson

10h 30m

2 stops

ONT11:55 pmOntario

Oct 17

ONT12:16 pmOntario

7h 03m

1 stop

SGF9:19 pmSpringfield-Branson

$434

Delta

Oct 13

SGF3:25 pmSpringfield-Branson

7h 00m

1 stop

ONT8:25 pmOntario

Oct 17

ONT12:16 pmOntario

7h 03m

1 stop

SGF9:19 pmSpringfield-Branson

$459

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

St. LouisOntario

STL Lambert-St Louis - ONT Ontario

STLONT

Lambert-St Louis

Sat 10/31

7:59 pm-11:51 pm

1 stop5h 52m

Ontario

Wed 11/4

6:25 am-3:23 pm

1 stop6h 58m

$93

St. LouisOntario

STL Lambert-St Louis - ONT Ontario

STLONT

Lambert-St Louis

Sat 10/31

7:59 pm-11:51 pm

1 stop5h 52m

Ontario

Wed 11/4

6:25 am-3:23 pm

1 stop6h 58m

$98

St. LouisOntario

STL Lambert-St Louis - ONT Ontario

STLONT

Lambert-St Louis

Tue 10/27

7:02 am-1:16 pm

1 stop8h 14m

Ontario

Wed 11/4

6:25 am-3:23 pm

1 stop6h 58m

$273

Kansas CityOntario

MCI Kansas City - ONT Ontario

MCIONT

Kansas City

Tue 10/27

8:43 pm-11:51 pm

1 stop5h 08m

Ontario

Tue 11/3

12:02 pm-11:59 pm

1 stop9h 57m

$289

ColumbiaOntario

COU Columbia Regional - ONT Ontario

COUONT

Columbia Regional

Thu 1/28

5:11 pm-11:13 pm

1 stop8h 02m

Ontario

Thu 2/4

6:00 am-4:37 pm

1 stop8h 37m

$348

ColumbiaOntario

COU Columbia Regional - ONT Ontario

COUONT

Columbia Regional

Fri 11/6

5:11 pm-11:46 pm

1 stop8h 35m

Ontario

Tue 11/10

6:00 am-4:41 pm

1 stop8h 41m

$348

Quickest round-trip

St. LouisOntario

STL Lambert-St Louis - ONT Ontario

STLONT

Lambert-St Louis

Sat 12/12

6:20 am-9:50 am

1 stop5h 30m

Ontario

Thu 12/17

4:00 pm-12:15 am

1 stop6h 15m

$352

St. LouisOntario

STL Lambert-St Louis - ONT Ontario

STLONT

Lambert-St Louis

Sat 12/12

6:35 am-12:50 pm

2 stops8h 15m

Ontario

Thu 12/17

4:00 pm-12:15 am

1 stop6h 15m

$362

St. LouisOntario

STL Lambert-St Louis - ONT Ontario

STLONT

Lambert-St Louis

Tue 10/27

1:08 pm-6:47 pm

1 stop7h 39m

Ontario

Wed 11/4

5:00 am-3:43 pm

2 stops8h 43m

$389

SpringfieldOntario

SGF Springfield-Branson - ONT Ontario

SGFONT

Springfield-Branson

Fri 11/13

4:56 pm-9:40 pm

1 stop6h 44m

Ontario

Fri 11/27

5:00 am-12:41 pm

1 stop5h 41m

$389

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first

How to get the cheapest flight ticket from Missouri to Ontario

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

Prices

Airlines

Other information

What is the cheapest month to fly to Ontario?

In general, October is the cheapest month to fly from Missouri to Ontario. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $322. If you aren’t able to travel during the month of October, then book flights to Ontario from Missouri during April instead. Flights to Ontario in April, while not as cheap as those in October, still average around $345.

What is the cheapest Missouri to Ontario flight route?

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

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

There is only 1 cabin class available to choose from on Missouri to Ontario 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 Missouri to Ontario flights?

You could potentially save up to 53% on your flight if you consider stops on a Missouri to Ontario flight.

Cheap Missouri to Ontario flight deals and tips

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

Best Price Found	$47
Fastest flight time	5h 07m
Direct flights	None

The best one-way flight to Ontario from Missouri in the past 72 hours is $47. The best round-trip flight deal from Missouri to Ontario found on momondo in the last 72 hours is $93.

The fastest flight from Missouri to Ontario takes 5h 07m

There are no direct flights from Missouri to Ontario. There are no popular flight routes from Missouri to Ontario.

Search flight deals

Frequently asked questions about flying from Missouri to Ontario

When did momondo last update prices for flights from Missouri to Ontario Airport?
Prices for flights from Missouri to Ontario Airport were last updated today.
How many operators does momondo search for flights from Missouri to Ontario Airport?
There are 4 operators available for flights from Missouri to Ontario Airport as of October 2026.
How old do you have to be to fly from Missouri to Ontario Airport?
The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Missouri to Ontario Airport.
What documentation or ID do you need to fly to Ontario Airport?
The travel and health documents required for your trip to Ontario Airport can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Ontario Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

Best airlines flying from Missouri to Ontario

Compare and see reviews for airlines that fly from Missouri to Ontario with momondo

Airline	Rating	Free Cancellation	Price
Frontier	PriceFrom $125	Free Cancellation	Rating 5.6 2,564 reviews	Search Frontier flights
United Airlines	PriceFrom $253	Free Cancellation	Rating 7.4 10,271 reviews	Search United Airlines flights
Southwest	PriceFrom $256	Free Cancellation	Rating 8.0 4,208 reviews	Search Southwest flights
American Airlines	PriceFrom $292	Free Cancellation	Rating 7.0 12,103 reviews	Search American Airlines flights

Why use momondo?

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

We help find the flight that best suits your needs, momondo compares prices from hundreds of airlines and travel agents and helps you filter them to find the best flight from Missouri to Ontario for you.

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

All flight searches from Missouri to Ontario on momondo can be filtered to show those which offer flexible booking policies.

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

Once you have performed a search for Missouri to Ontario flights, momondo helps you find the right one by offering useful filters to narrow down your flight selection. Flights can be filtered by multiple factors such as airline, airport and price; but also by other criteria like aircraft type and payment method.

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

If you are not ready to book a flight from Missouri to Ontario now, use our insights above to find helpful tips or alternatively set up a price alert, where momondo will track prices on flights to Ontario and let you know when they change.

An easier way to manage your Ontario trip

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Cheap flights from Missouri to Los Angeles from $47

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Missouri to Los Angeles departing on 10/31. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.

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Frontier flights from Missouri to Ontario

Our best Frontier deals on Missouri to Ontario flight tickets

Delta flights from Missouri to Ontario

Our best Delta deals on Missouri to Ontario flight tickets

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How to get the cheapest flight ticket from Missouri to Ontario

What is the cheapest month to fly to Ontario?

What is the cheapest Missouri to Ontario flight route?

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

Can stopping save me money on Missouri to Ontario flights?

What is the cheapest airline that flies from Missouri to Ontario?

What airlines fly to Ontario?

How long does it take to fly to Ontario?

Cheap Missouri to Ontario flight deals and tips

Best Price Found

Fastest flight time

Direct flights

Frequently asked questions about flying from Missouri to Ontario

Best airlines flying from Missouri to Ontario

Compare and see reviews for airlines that fly from Missouri to Ontario with momondo

Why use momondo?

An easier way to manage your Ontario trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.

Find better results for your trip to the United States

Airports servicing California

Fly your favorite airline to Los Angeles

Airlines are sorted and displayed according to clicks in the past 7 days on momondo

Cabin classes currently available on flights to Los Angeles

List of cabin classes available on flights landing in Los Angeles. Availability may vary depending on flight origin and airline.

Popular cities in the United States

Popular flights according to clicks in the last 7 days on momondo

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