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Cheap flights from Missouri to Los Angeles from $55

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 10/18. 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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Find the cheapest flights from Missouri to Los Angeles

Cheap round-trip flights

Frontier Logo
7:52 pm - 11:50 pmSTL-ONT
5h 58m1 stop
Frontier Logo
6:00 am - 1:57 pmONT-STL
5h 57m1 stop
$143Frontier
Find Deal
Sat, Oct 25 - Thu, Oct 30
Frontier Logo
7:55 pm - 7:54 pmSTL-ONT
25h 59m1 stop
Frontier Logo
8:59 pm - 9:06 amONT-STL
10h 07m1 stop
$144Frontier
Find Deal
Fri, Oct 3 - Sun, Oct 5
Multiple Airlines Logo
2:55 pm - 8:42 pmMCI-ONT
7h 47m1 stop
Multiple Airlines Logo
8:00 am - 2:00 pmONT-MCI
28h 00m1 stop
$216Multiple Airlines
Find Deal
Tue, Oct 7 - Tue, Oct 28
Alaska Airlines Logo
4:49 pm - 11:56 pmMCI-ONT
9h 07m1 stop
Alaska Airlines Logo
7:20 am - 3:54 pmONT-MCI
6h 34m1 stop
$232Alaska Airlines
Find Deal
Thu, Nov 6 - Tue, Nov 11
Alaska Airlines Logo
2:55 pm - 10:37 pmMCI-ONT
9h 42m1 stop
Alaska Airlines Logo
11:30 am - 11:47 pmONT-MCI
10h 17m1 stop
$236Alaska Airlines
Find Deal
Tue, Feb 24 - Wed, Feb 25
Multiple Airlines Logo
7:00 am - 7:17 amMCI-ONT
26h 17m1 stop
Multiple Airlines Logo
7:44 pm - 12:40 amONT-MCI
26h 56m1 stop
$239Multiple Airlines
Find Deal
Thu, Nov 13 - Sun, Nov 16
American Airlines Logo
12:46 pm - 7:41 pmMCI-ONT
8h 55m1 stop
American Airlines Logo
12:55 pm - 11:09 pmONT-MCI
8h 14m2 stops
$256American Airlines
Find Deal
Wed, Nov 19 - Mon, Nov 24
Delta Logo
6:28 am - 12:18 pmMCI-ONT
7h 50m1 stop
Delta Logo
4:49 pm - 12:24 amONT-MCI
5h 35m1 stop
$257Delta
Find Deal
Tue, Nov 18 - Tue, Nov 18
Delta Logo
6:28 am - 12:18 pmMCI-ONT
7h 50m1 stop
Delta Logo
4:49 pm - 12:24 amONT-MCI
5h 35m1 stop
$261Delta
Find Deal
Sat, Nov 15 - Tue, Nov 18
American Airlines Logo
5:34 am - 10:07 amMCI-ONT
6h 33m1 stop
American Airlines Logo
11:59 pm - 10:13 amONT-MCI
8h 14m1 stop
$274American Airlines
Find Deal
Tue, Oct 14 - Tue, Oct 21

Frontier flights from Missouri to Ontario

Our best Frontier deals on Missouri to Ontario flight tickets
Frontier
Oct 25
STL7:52 pmLambert-St Louis
5h 58m
1 stop
ONT11:50 pmOntario
Oct 30
ONT6:00 amOntario
5h 57m
1 stop
STL1:57 pmLambert-St Louis
$143
Find similar
Frontier
Oct 3
STL7:55 pmLambert-St Louis
25h 59m
1 stop
ONT7:54 pmOntario
Oct 5
ONT8:59 pmOntario
10h 07m
1 stop
STL9:06 amLambert-St Louis
$144
Find similar
Frontier
Oct 5
STL2:38 pmLambert-St Louis
18h 39m
1 stop
ONT7:17 amOntario
Oct 12
ONT6:53 amOntario
24h 14m
1 stop
STL9:07 amLambert-St Louis
$145
Find similar

Alaska Airlines flights from Missouri to Ontario

Our best Alaska Airlines deals on Missouri to Ontario flight tickets
Alaska Airlines
Nov 6
MCI4:49 pmKansas City
9h 07m
1 stop
ONT11:56 pmOntario
Nov 11
ONT7:20 amOntario
6h 34m
1 stop
MCI3:54 pmKansas City
$232
Find similar
Alaska Airlines
Feb 24
MCI2:55 pmKansas City
9h 42m
1 stop
ONT10:37 pmOntario
Feb 25
ONT11:30 amOntario
10h 17m
1 stop
MCI11:47 pmKansas City
$236
Find similar
Alaska Airlines
Nov 13
MCI4:49 pmKansas City
9h 07m
1 stop
ONT11:56 pmOntario
Nov 18
ONT7:20 amOntario
6h 34m
1 stop
MCI3:54 pmKansas City
$250
Find similar

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 September 19, 2025.
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

St. LouisOntario

STL - ONT

STLONT

Lambert-St Louis

Sat 10/25

7:52 pm-11:50 pm

1 stop5h 58m

Ontario

Thu 10/30

6:00 am-1:57 pm

1 stop5h 57m

$143

St. LouisOntario

STL - ONT

STLONT

Lambert-St Louis

Fri 10/3

7:55 pm-7:54 pm

1 stop25h 59m

Ontario

Sun 10/5

8:59 pm-9:06 am

1 stop10h 07m

$144

Kansas CityOntario

MCI - ONT

MCIONT

Kansas City

Tue 10/7

2:55 pm-8:42 pm

1 stop7h 47m

Ontario

Tue 10/28

8:00 am-2:00 pm

1 stop28h 00m

$216

Kansas CityOntario

MCI - ONT

MCIONT

Kansas City

Thu 11/6

4:49 pm-11:56 pm

1 stop9h 07m

Ontario

Tue 11/11

7:20 am-3:54 pm

1 stop6h 34m

$232

Kansas CityOntario

MCI - ONT

MCIONT

Kansas City

Tue 2/24

2:55 pm-10:37 pm

1 stop9h 42m

Ontario

Wed 2/25

11:30 am-11:47 pm

1 stop10h 17m

$236

Kansas CityOntario

MCI - ONT

MCIONT

Kansas City

Thu 11/13

7:00 am-7:17 am

1 stop26h 17m

Ontario

Sun 11/16

7:44 pm-12:40 am

1 stop26h 56m

$239

Kansas CityOntario

MCI - ONT

MCIONT

Kansas City

Wed 11/19

12:46 pm-7:41 pm

1 stop8h 55m

Ontario

Mon 11/24

12:55 pm-11:09 pm

2 stops8h 14m

$256

Kansas CityOntario

MCI - ONT

MCIONT

Kansas City

Tue 11/18

6:28 am-12:18 pm

1 stop7h 50m

Ontario

Tue 11/18

4:49 pm-12:24 am

1 stop5h 35m

$257

Kansas CityOntario

MCI - ONT

MCIONT

Kansas City

Sat 11/15

6:28 am-12:18 pm

1 stop7h 50m

Ontario

Tue 11/18

4:49 pm-12:24 am

1 stop5h 35m

$261

Kansas CityOntario

MCI - ONT

MCIONT

Kansas City

Tue 10/14

5:34 am-10:07 am

1 stop6h 33m

Ontario

Tue 10/21

11:59 pm-10:13 am

1 stop8h 14m

$274

Flights are sorted by cheapest round-trip flights 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, February 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 $256. If you aren’t able to travel during the month of February, then book flights to Ontario from Missouri during August instead. Flights to Ontario in August, while not as cheap as those in February, still average around $301.

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

The cheapest day to depart on your flight to Ontario is on a Tuesday when prices can be found for as low as $291. This is often the case because there is less demand to fly during this day of the week. When flying out on a Sunday, the most expensive travel day of the week, you can expect to see flight prices from Missouri to Ontario for around $376.

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

In the afternoon is the cheapest time of day to fly from Missouri to Ontario when you can find flight prices for as low as $361. Flying to Ontario in the afternoon is an ideal time because this is during off-peak travel hours. If you have a flexible travel schedule, then try to avoid flying in the morning when prices are $442 on average. Flights to Ontario from Missouri in the morning are generally more expensive because this time of day is more convenient for travelers’ schedules.

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

You are more likely to see cheaper flights to Ontario from Missouri when booking weeks ahead of your departure date. In general, you can expect to find flights to Ontario for around $374 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Ontario from Missouri for as low as $130 on momondo.

Can stopping save me money on Missouri to Ontario flights?

You could potentially save up to 81% 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

Direct flights

None
There are no direct flights from Missouri to Ontario. There are no popular flight routes from Missouri to Ontario.
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  • 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 $114Free CancellationRating
5.8
3,171 reviews
Search Frontier flights
DeltaPriceFrom $181Free CancellationRating
7.9
7,964 reviews
Search Delta flights
American AirlinesPriceFrom $264Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights
United AirlinesPriceFrom $284Free CancellationRating
7.4
8,926 reviews
Search United Airlines flights
SouthwestPriceFrom $290Free CancellationRating
8.0
4,242 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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