What airlines fly to Missouri?

Southwest, American Airlines and Delta are the top three most popular airlines that fly to Missouri from Ontario 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 Missouri. Keep in mind that there are 8 different airlines that fly to Missouri on a routine basis, so you have a few additional options to choose from.

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

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

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

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

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

As of June 2026, there are 5 operators available to choose from for flights from Ontario Airport to Missouri.

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

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

The travel and health documents required for your trip to Missouri 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 Missouri. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

$108 Cheap Flights from Ontario to Missouri in 2026

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from Ontario to Missouri

Round-trip

One-way

Last minute

Cheap round-trip flights

Enter your travel dates to find the best prices.

3:40 pm - 6:05 pm

ONT

STL

24h 25m

1 stop

8:08 pm - 10:04 am

STL

ONT

15h 56m

1 stop

$199Frontier

Tue, Jul 14 - Tue, Jul 21

6:00 am - 7:23 pm

ONT

STL

11h 23m

1 stop

7:10 pm - 3:54 pm

STL

ONT

22h 44m

1 stop

$223Frontier

Tue, Aug 4 - Sun, Aug 9

6:00 am - 7:23 pm

ONT

STL

11h 23m

1 stop

7:10 pm - 8:03 am

STL

ONT

14h 53m

1 stop

$228Frontier

Wed, Jul 22 - Mon, Jul 27

6:00 am - 1:00 pm

ONT

MCI

29h 00m

1 stop

4:32 pm - 3:54 pm

MCI

ONT

25h 22m

1 stop

$233Frontier

Tue, Aug 4 - Sun, Aug 9

3:40 pm - 2:01 pm

ONT

SGF

20h 21m

1 stop

2:51 pm - 8:03 am

SGF

ONT

19h 12m

1 stop

$298Multiple Airlines

Tue, Jul 28 - Wed, Aug 5

3:40 pm - 2:01 pm

ONT

SGF

20h 21m

1 stop

2:51 pm - 11:02 am

SGF

ONT

22h 11m

2 stops

$322Multiple Airlines

Tue, Jul 28 - Wed, Aug 5

1:11 pm - 10:20 pm

ONT

COU

7h 09m

2 stops

5:19 pm - 11:59 pm

COU

ONT

8h 40m

1 stop

$324American Airlines

Tue, Jul 14 - Tue, Jul 28

1:11 pm - 10:20 pm

ONT

COU

7h 09m

2 stops

11:45 am - 6:18 pm

COU

ONT

8h 33m

2 stops

$329American Airlines

Tue, Jul 14 - Tue, Jul 28

1:18 pm - 8:59 pm

ONT

COU

5h 41m

1 stop

3:12 pm - 10:35 pm

COU

ONT

9h 23m

1 stop

$408United Airlines

Tue, Sep 1 - Sat, Sep 5

1:18 pm - 8:59 pm

ONT

COU

5h 41m

1 stop

10:55 am - 8:01 pm

COU

ONT

11h 06m

2 stops

$414United Airlines

Tue, Sep 1 - Sat, Sep 5

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Frontier flights from Ontario to Missouri

Our best Frontier deals on Ontario to Missouri flight tickets

Frontier

Jul 21

ONT10:49 amOntario

6h 34m

1 stop

STL7:23 pmLambert-St Louis

Jul 28

STL8:08 pmLambert-St Louis

15h 56m

1 stop

ONT10:04 amOntario

$217

Frontier

Aug 4

ONT6:00 amOntario

11h 23m

1 stop

STL7:23 pmLambert-St Louis

Aug 9

STL7:10 pmLambert-St Louis

22h 44m

1 stop

ONT3:54 pmOntario

$223

Frontier

Jul 22

ONT6:00 amOntario

11h 23m

1 stop

STL7:23 pmLambert-St Louis

Jul 27

STL7:10 pmLambert-St Louis

14h 53m

1 stop

ONT8:03 amOntario

$228

United Airlines flights from Ontario to Missouri

Our best United Airlines deals on Ontario to Missouri flight tickets

United Airlines

Sep 23

ONT1:18 pmOntario

5h 29m

1 stop

SGF8:47 pmSpringfield-Branson

Sep 29

SGF5:30 amSpringfield-Branson

11h 41m

2 stops

ONT3:11 pmOntario

$408

United Airlines

Sep 1

ONT1:18 pmOntario

5h 41m

1 stop

COU8:59 pmColumbia Regional

Sep 5

COU10:55 amColumbia Regional

11h 06m

2 stops

ONT8:01 pmOntario

$414

United Airlines

Sep 1

ONT9:01 amOntario

9h 58m

2 stops

COU8:59 pmColumbia Regional

Sep 5

COU10:55 amColumbia Regional

11h 06m

2 stops

ONT8:01 pmOntario

$419

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

OntarioSt. Louis

ONT - STL

ONTSTL

Ontario

Tue 7/14

3:40 pm-6:05 pm

1 stop24h 25m

Lambert-St Louis

Tue 7/21

8:08 pm-10:04 am

1 stop15h 56m

$199

OntarioSt. Louis

ONT - STL

ONTSTL

Ontario

Tue 8/4

6:00 am-7:23 pm

1 stop11h 23m

Lambert-St Louis

Sun 8/9

7:10 pm-3:54 pm

1 stop22h 44m

$223

OntarioSt. Louis

ONT - STL

ONTSTL

Ontario

Wed 7/22

6:00 am-7:23 pm

1 stop11h 23m

Lambert-St Louis

Mon 7/27

7:10 pm-8:03 am

1 stop14h 53m

$228

OntarioKansas City

ONT - MCI

ONTMCI

Ontario

Tue 8/4

6:00 am-1:00 pm

1 stop29h 00m

Kansas City

Sun 8/9

4:32 pm-3:54 pm

1 stop25h 22m

$233

OntarioSpringfield

ONT - SGF

ONTSGF

Ontario

Tue 7/28

3:40 pm-2:01 pm

1 stop20h 21m

Springfield-Branson

Wed 8/5

2:51 pm-8:03 am

1 stop19h 12m

$298

OntarioSpringfield

ONT - SGF

ONTSGF

Ontario

Tue 7/28

3:40 pm-2:01 pm

1 stop20h 21m

Springfield-Branson

Wed 8/5

2:51 pm-11:02 am

2 stops22h 11m

$322

OntarioColumbia

ONT - COU

ONTCOU

Ontario

Tue 7/14

1:11 pm-10:20 pm

2 stops7h 09m

Columbia Regional

Tue 7/28

5:19 pm-11:59 pm

1 stop8h 40m

$324

OntarioColumbia

ONT - COU

ONTCOU

Ontario

Tue 7/14

1:11 pm-10:20 pm

2 stops7h 09m

Columbia Regional

Tue 7/28

11:45 am-6:18 pm

2 stops8h 33m

$329

Quickest round-trip

OntarioColumbia

ONT - COU

ONTCOU

Ontario

Tue 9/1

1:18 pm-8:59 pm

1 stop5h 41m

Columbia Regional

Sat 9/5

3:12 pm-10:35 pm

1 stop9h 23m

$408

OntarioColumbia

ONT - COU

ONTCOU

Ontario

Tue 9/1

1:18 pm-8:59 pm

1 stop5h 41m

Columbia Regional

Sat 9/5

10:55 am-8:01 pm

2 stops11h 06m

$414

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 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

Prices

Airlines

What is the cheapest month to fly to Missouri?

In general, September is the cheapest month to fly from Ontario to Missouri. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $71. If you aren’t able to travel to Missouri during the month of September, then flying in August is also cheap. Prices for this month can be found on momondo for an average of $98.

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

You are more likely to see cheaper flights to Missouri from Ontario when booking weeks ahead of your departure date. In general, you can expect to find flights to Missouri for around $333 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Missouri from Ontario for as low as $328 on momondo.

Cheap Ontario to Missouri flight deals and tips

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

Fastest flight time	4h 53m
Direct flights	None

The fastest flight from Ontario to Missouri takes 4h 53m

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

Search flight deals

Frequently asked questions about flying from Ontario to Missouri

When did momondo last update prices for flights from Ontario Airport to Missouri?
Prices for flights from Ontario Airport to Missouri were last updated today.
How many operators does momondo search for flights from Ontario Airport to Missouri?
As of June 2026, there are 5 operators available to choose from for flights from Ontario Airport to Missouri.
How old do you have to be to fly from Ontario Airport 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 Airport to Missouri.
What documentation or ID do you need to fly to Missouri?
The travel and health documents required for your trip to Missouri 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 Missouri. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

Best airlines flying from Ontario to Missouri

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

Airline	Rating	Free Cancellation	Price
Delta	PriceFrom $98	Free Cancellation	Rating 7.8 8,424 reviews	Search Delta flights
Frontier	PriceFrom $159	Free Cancellation	Rating 5.6 2,870 reviews	Search Frontier flights
Southwest	PriceFrom $246	Free Cancellation	Rating 7.9 4,242 reviews	Search Southwest flights
United Airlines	PriceFrom $249	Free Cancellation	Rating 7.4 9,875 reviews	Search United Airlines flights
American Airlines	PriceFrom $259	Free Cancellation	Rating 7.1 11,745 reviews	Search American Airlines flights

Why use momondo?

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

Finding the right flight to Missouri from Ontario is quick and easy when you have a range of options in front of you, from reputable agents and recognisable airlines. Options that can then be filtered down to find the best fit. That is what momondo does. We make finding flights to Missouri quick and easy, saving you time and money.

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

momondo does allow users to show only those flights to Missouri from Ontario which offer a flexible booking policy as well as other useful filters and features.

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

momondo offers useful filters to help you find the right flight. Choose specific flight times, airports or even what payment method you prefer. We have numerous options to help you book your ideal flight from Ontario to Missouri.

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

Yes. momondo can track prices for Ontario to Missouri flights and alert you when they change. Perform a search to set up the price alert. All that is required is a valid email address.