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Cheap flights from Missouri to Los Angeles from $78

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 9/29. 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 Missouri to Los Angeles

Cheap round-trip flights

Enter your travel dates to find the best prices.
Frontier Logo
2:17 pm - 11:55 pmMCI  Kansas City-ONT Ontario
11h 38m1 stop Denver Intl
Frontier Logo
6:15 am - 1:22 pmONT  Ontario-MCI Kansas City
5h 07m1 stop Denver Intl
$158Frontier
Wed, Oct 28 - Sat, Oct 31
Frontier Logo
2:17 pm - 11:55 pmMCI  Kansas City-ONT Ontario
11h 38m1 stop Denver Intl
Frontier Logo
6:15 am - 1:22 pmONT  Ontario-MCI Kansas City
5h 07m1 stop Denver Intl
$158Frontier
Tue, Nov 3 - Wed, Nov 4
Multiple Airlines Logo
2:53 pm - 9:51 amMCI  Kansas City-ONT Ontario
20h 58m1 stop Portland
Multiple Airlines Logo
11:45 am - 7:37 pmONT  Ontario-MCI Kansas City
5h 52m1 stop Denver Intl
$249Multiple Airlines
Tue, Sep 8 - Tue, Sep 15
Multiple Airlines Logo
6:02 am - 1:16 pmSTL  Lambert-St Louis-ONT Ontario
9h 14m1 stop Seattle/Tacoma Intl
Multiple Airlines Logo
2:58 pm - 1:17 amONT  Ontario-STL Lambert-St Louis
8h 19m1 stop Las Vegas Harry Reid Intl
$250Multiple Airlines
Sat, Oct 17 - Tue, Oct 20
Southwest Logo
8:10 am - 2:45 pmMCI  Kansas City-ONT Ontario
8h 35m1 stop Houston Hobby
Southwest Logo
5:40 am - 2:55 pmONT  Ontario-MCI Kansas City
7h 15m2 stops Las Vegas Harry Reid Intl Dallas Love Field
$261Southwest
Wed, Oct 28 - Sat, Oct 31
American Airlines Logo
8:03 am - 12:14 pmSTL  Lambert-St Louis-ONT Ontario
6h 11m1 stop Phoenix Sky Harbor Intl
American Airlines Logo
1:05 pm - 11:42 pmONT  Ontario-STL Lambert-St Louis
8h 37m2 stops Phoenix Sky Harbor Intl Dallas/Fort Worth
$272American Airlines
Wed, Oct 21 - Sat, Oct 24
American Airlines Logo
2:30 pm - 6:17 pmSTL  Lambert-St Louis-ONT Ontario
5h 47m1 stop Phoenix Sky Harbor Intl
American Airlines Logo
10:25 am - 6:04 pmONT  Ontario-STL Lambert-St Louis
5h 39m1 stop Dallas/Fort Worth
$277American Airlines
Sat, Sep 12 - Sat, Sep 19
Southwest Logo
12:35 pm - 6:10 pmMCI  Kansas City-ONT Ontario
7h 35m1 stop Dallas Love Field
Southwest Logo
12:00 pm - 8:15 pmONT  Ontario-MCI Kansas City
6h 15m1 stop Sacramento Intl
$281Southwest
Sat, Oct 3 - Mon, Oct 5
United Airlines Logo
11:31 am - 6:01 pmMCI  Kansas City-ONT Ontario
8h 30m2 stops Denver Intl San Francisco
United Airlines Logo
6:00 am - 4:11 pmONT  Ontario-MCI Kansas City
8h 11m2 stops San Francisco Denver Intl
$324United Airlines
Wed, Oct 28 - Sat, Oct 31
United Airlines Logo
3:05 pm - 9:59 pmSGF  Springfield-Branson-ONT Ontario
8h 54m1 stop Houston George Bush Intcntl
United Airlines Logo
1:18 pm - 8:29 pmONT  Ontario-SGF Springfield-Branson
5h 11m1 stop Denver Intl
$339United Airlines
Sun, Sep 6 - Sat, Sep 12

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Frontier flights from Missouri to Ontario

Our best Frontier deals on Missouri to Ontario flight tickets
Frontier
Oct 28
MCI2:17 pmKansas City
11h 38m
1 stop
ONT11:55 pmOntario
Oct 31
ONT6:15 amOntario
5h 07m
1 stop
MCI1:22 pmKansas City
$158
Frontier
Sep 26
MCI8:32 pmKansas City
5h 15m
1 stop
ONT11:47 pmOntario
Oct 3
ONT11:45 amOntario
5h 52m
1 stop
MCI7:37 pmKansas City
$159
Frontier
Sep 10
STL10:20 amLambert-St Louis
10h 19m
1 stop
ONT6:39 pmOntario
Sep 19
ONT11:45 amOntario
5h 32m
1 stop
STL7:17 pmLambert-St Louis
$168

American Airlines flights from Missouri to Ontario

Our best American Airlines deals on Missouri to Ontario flight tickets
American Airlines
Oct 21
STL8:03 amLambert-St Louis
6h 11m
1 stop
ONT12:14 pmOntario
Oct 24
ONT1:05 pmOntario
8h 37m
2 stops
STL11:42 pmLambert-St Louis
$272
American Airlines
Sep 5
STL5:42 amLambert-St Louis
8h 21m
2 stops
ONT12:03 pmOntario
Sep 9
ONT6:15 amOntario
9h 49m
2 stops
STL6:04 pmLambert-St Louis
$277
American Airlines
Oct 3
MCI5:28 amKansas City
8h 35m
2 stops
ONT12:03 pmOntario
Oct 5
ONT11:59 pmOntario
6h 58m
1 stop
MCI8:57 amKansas City
$286

momondo 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, momondo users made 832,500 searches. Data last updated August 12, 2026.
Use the filters below to find and compare flights from Missouri to Ontario that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

Kansas CityOntario

MCI Kansas City - ONT Ontario

MCIONT

Kansas City

Wed 10/28

2:17 pm-11:55 pm

1 stop11h 38m

Ontario

Sat 10/31

6:15 am-1:22 pm

1 stop5h 07m

$158

Kansas CityOntario

MCI Kansas City - ONT Ontario

MCIONT

Kansas City

Tue 11/3

2:17 pm-11:55 pm

1 stop11h 38m

Ontario

Wed 11/4

6:15 am-1:22 pm

1 stop5h 07m

$158

Kansas CityOntario

MCI Kansas City - ONT Ontario

MCIONT

Kansas City

Tue 9/8

2:53 pm-9:51 am

1 stop20h 58m

Ontario

Tue 9/15

11:45 am-7:37 pm

1 stop5h 52m

$249

St. LouisOntario

STL Lambert-St Louis - ONT Ontario

STLONT

Lambert-St Louis

Sat 10/17

6:02 am-1:16 pm

1 stop9h 14m

Ontario

Tue 10/20

2:58 pm-1:17 am

1 stop8h 19m

$250

Kansas CityOntario

MCI Kansas City - ONT Ontario

MCIONT

Kansas City

Wed 10/28

8:10 am-2:45 pm

1 stop8h 35m

Ontario

Sat 10/31

5:40 am-2:55 pm

2 stops7h 15m

$261

St. LouisOntario

STL Lambert-St Louis - ONT Ontario

STLONT

Lambert-St Louis

Wed 10/21

8:03 am-12:14 pm

1 stop6h 11m

Ontario

Sat 10/24

1:05 pm-11:42 pm

2 stops8h 37m

$272
Quickest round-trip

St. LouisOntario

STL Lambert-St Louis - ONT Ontario

STLONT

Lambert-St Louis

Sat 9/12

2:30 pm-6:17 pm

1 stop5h 47m

Ontario

Sat 9/19

10:25 am-6:04 pm

1 stop5h 39m

$277

Kansas CityOntario

MCI Kansas City - ONT Ontario

MCIONT

Kansas City

Sat 10/3

12:35 pm-6:10 pm

1 stop7h 35m

Ontario

Mon 10/5

12:00 pm-8:15 pm

1 stop6h 15m

$281

Kansas CityOntario

MCI Kansas City - ONT Ontario

MCIONT

Kansas City

Wed 10/28

11:31 am-6:01 pm

2 stops8h 30m

Ontario

Sat 10/31

6:00 am-4:11 pm

2 stops8h 11m

$324

SpringfieldOntario

SGF Springfield-Branson - ONT Ontario

SGFONT

Springfield-Branson

Sun 9/6

3:05 pm-9:59 pm

1 stop8h 54m

Ontario

Sat 9/12

1:18 pm-8:29 pm

1 stop5h 11m

$339

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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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

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 $335. If you aren’t able to travel during the month of October, then book flights to Ontario from Missouri during August instead. Flights to Ontario in August, while not as cheap as those in October, still average around $338.

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 61% 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

Fastest flight time

5h 15m

Direct flights

None
The fastest flight from Missouri to Ontario takes 5h 15m
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?

  • 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
FrontierPriceFrom $125Free CancellationRating
5.6
2,701 reviews
Search Frontier flights
United AirlinesPriceFrom $201Free CancellationRating
7.4
10,111 reviews
Search United Airlines flights
American AirlinesPriceFrom $248Free CancellationRating
7.1
11,910 reviews
Search American Airlines flights
SouthwestPriceFrom $269Free CancellationRating
8.0
4,220 reviews
Search Southwest 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.

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