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Cheap flights from the United States to Los Angeles from $29

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from the United States to Los Angeles departing on 12/14. 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 the United States to Los Angeles

Recent round-trip flight deals from the United States to Los Angeles

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Frontier Logo
12:58 pm - 2:25 pmDEN-ONT
2h 27mnonstop
Frontier Logo
3:20 pm - 6:40 pmONT-DEN
2h 20mnonstop
$79Frontier
Find Deal
Fri, Dec 5 - Sat, Dec 6
Frontier Logo
10:29 pm - 11:57 pmDEN-ONT
2h 28mnonstop
Frontier Logo
12:58 am - 4:20 amONT-DEN
2h 22mnonstop
$80Frontier
Find Deal
Mon, Nov 24 - Tue, Nov 25
Delta Logo
7:00 pm - 11:53 pmSEA-ONT
4h 53m1 stop
Delta Logo
7:30 am - 10:36 amONT-SEA
3h 06mnonstop
$129Delta
Find Deal
Fri, Feb 27 - Sat, Feb 28
Delta Logo
5:00 pm - 9:55 pmSEA-ONT
4h 55m1 stop
Delta Logo
6:40 am - 9:45 amONT-SEA
3h 05mnonstop
$130Delta
Find Deal
Sat, Dec 13 - Sun, Dec 14
Alaska Airlines Logo
8:55 pm - 11:29 pmSEA-ONT
2h 34mnonstop
Alaska Airlines Logo
6:00 am - 8:57 amONT-SEA
2h 57mnonstop
$133Alaska Airlines
Find Deal
Thu, Dec 11 - Thu, Dec 18
Alaska Airlines Logo
8:55 pm - 11:29 pmSEA-ONT
2h 34mnonstop
Alaska Airlines Logo
6:00 am - 8:57 amONT-SEA
2h 57mnonstop
$138Alaska Airlines
Find Deal
Fri, Dec 5 - Wed, Dec 17
American Airlines Logo
8:19 pm - 11:55 pmHOU-ONT
5h 36m1 stop
American Airlines Logo
9:59 am - 8:18 pmONT-HOU
8h 19m2 stops
$192American Airlines
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Thu, Dec 4 - Sat, Dec 6
Southwest Logo
6:20 am - 9:15 amHOU-ONT
4h 55m1 stop
Southwest Logo
9:55 am - 7:45 pmONT-HOU
7h 50m1 stop
$230Southwest
Find Deal
Thu, Dec 4 - Mon, Dec 8
Southwest Logo
2:10 pm - 10:05 pmLGA-ONT
10h 55m1 stop
Southwest Logo
10:30 am - 11:25 pmONT-LGA
9h 55m1 stop
$243Southwest
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Tue, Dec 2 - Wed, Dec 10
American Airlines Logo
2:55 pm - 9:07 pmJFK-ONT
9h 12m1 stop
American Airlines Logo
10:34 pm - 10:20 amONT-JFK
8h 46m1 stop
$247American Airlines
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Thu, Dec 4 - Sun, Dec 7

United Airlines flights from United States to Ontario

Our best United Airlines deals on United States to Ontario flight tickets
United Airlines
Dec 3
SFO9:28 pmSan Francisco
1h 21m
ONT10:49 pmOntario
Dec 10
ONT1:50 pmOntario
1h 24m
SFO3:14 pmSan Francisco
$113
Find similar
United Airlines
Dec 3
SFO9:28 pmSan Francisco
1h 21m
ONT10:49 pmOntario
Dec 6
ONT6:41 pmOntario
1h 24m
SFO8:05 pmSan Francisco
$137
Find similar
United Airlines
Nov 19
LGA4:15 pmNew York LaGuardia
9h 16m
1 stop
ONT10:31 pmOntario
Dec 2
ONT5:05 amOntario
10h 39m
2 stops
LGA6:44 pmNew York LaGuardia
$371
Find similar

Alaska Airlines flights from United States to Ontario

Our best Alaska Airlines deals on United States to Ontario flight tickets
Alaska Airlines
Dec 11
SEA8:55 pmSeattle/Tacoma Intl
2h 34m
ONT11:29 pmOntario
Dec 18
ONT6:00 amOntario
2h 57m
SEA8:57 amSeattle/Tacoma Intl
$133
Find similar
Alaska Airlines
Dec 5
SEA8:55 pmSeattle/Tacoma Intl
2h 34m
ONT11:29 pmOntario
Dec 17
ONT6:00 amOntario
2h 57m
SEA8:57 amSeattle/Tacoma Intl
$138
Find similar
Alaska Airlines
Dec 4
SEA8:55 pmSeattle/Tacoma Intl
2h 34m
ONT11:29 pmOntario
Dec 6
ONT6:00 amOntario
2h 57m
SEA8:57 amSeattle/Tacoma Intl
$139
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from United States 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 November 13, 2025.
Use the filters below to find and compare flights from the United States to Ontario that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

DenverOntario

DEN - ONT

DENONT

Denver Intl

Fri 12/5

12:58 pm-2:25 pm

Nonstop2h 27m

Ontario

Sat 12/6

3:20 pm-6:40 pm

Nonstop2h 20m

$79

DenverOntario

DEN - ONT

DENONT

Denver Intl

Mon 11/24

10:29 pm-11:57 pm

Nonstop2h 28m

Ontario

Tue 11/25

12:58 am-4:20 am

Nonstop2h 22m

$80

SeattleOntario

SEA - ONT

SEAONT

Seattle/Tacoma Intl

Fri 2/27

7:00 pm-11:53 pm

1 stop4h 53m

Ontario

Sat 2/28

7:30 am-10:36 am

Nonstop3h 06m

$129

SeattleOntario

SEA - ONT

SEAONT

Seattle/Tacoma Intl

Sat 12/13

5:00 pm-9:55 pm

1 stop4h 55m

Ontario

Sun 12/14

6:40 am-9:45 am

Nonstop3h 05m

$130

SeattleOntario

SEA - ONT

SEAONT

Seattle/Tacoma Intl

Thu 12/11

8:55 pm-11:29 pm

Nonstop2h 34m

Ontario

Thu 12/18

6:00 am-8:57 am

Nonstop2h 57m

$133

SeattleOntario

SEA - ONT

SEAONT

Seattle/Tacoma Intl

Fri 12/5

8:55 pm-11:29 pm

Nonstop2h 34m

Ontario

Wed 12/17

6:00 am-8:57 am

Nonstop2h 57m

$138

HoustonOntario

HOU - ONT

HOUONT

Houston Hobby

Thu 12/4

8:19 pm-11:55 pm

1 stop5h 36m

Ontario

Sat 12/6

9:59 am-8:18 pm

2 stops8h 19m

$192

HoustonOntario

HOU - ONT

HOUONT

Houston Hobby

Thu 12/4

6:20 am-9:15 am

1 stop4h 55m

Ontario

Mon 12/8

9:55 am-7:45 pm

1 stop7h 50m

$230

New YorkOntario

LGA - ONT

LGAONT

New York LaGuardia

Tue 12/2

2:10 pm-10:05 pm

1 stop10h 55m

Ontario

Wed 12/10

10:30 am-11:25 pm

1 stop9h 55m

$243

New YorkOntario

JFK - ONT

JFKONT

New York John F Kennedy Intl

Thu 12/4

2:55 pm-9:07 pm

1 stop9h 12m

Ontario

Sun 12/7

10:34 pm-10:20 am

1 stop8h 46m

$247

Flights are sorted by cheapest round-trip flights first.

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How to get the cheapest flight ticket from United States 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, September is the cheapest month to fly from United States to Ontario. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $287. If you aren’t able to travel during the month of September, then book flights to Ontario from United States during October instead. Flights to Ontario in October, while not as cheap as those in September, still average around $287.

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 Friday when prices can be found for as low as $302. This is often the case because there is less demand to fly during this day of the week. When flying out on a Monday, the most expensive travel day of the week, you can expect to see flight prices from United States to Ontario for around $387.

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

At noon is the cheapest time of day to fly from United States to Ontario when you can find flight prices for as low as $334. Flying to Ontario at noon 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 $362 on average. Flights to Ontario from United States in the morning are generally more expensive because this time of day is more convenient for travelers’ schedules.

What is the cheapest United States to Ontario flight route?

Fly from Las Vegas Harry Reid Intl to Ontario for the best United States - Ontario flight prices

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

You are more likely to see cheaper flights to Ontario from United States when booking weeks ahead of your departure date. In general, you can expect to find flights to Ontario for around $351 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Ontario from United States for as low as $264 on momondo.

What cabin class options are available on United States to Ontario flights?

There are 4 cabin classes available to choose from on United States 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 United States to Ontario flights?

No. A direct flight is the cheapest option for a flight between United States to Ontario.

Cheap United States to Ontario flight deals and tips

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

Best Price Found

$74

Fastest flight time

1h 21m

Direct flights

Every day

Airports in Ontario

1 airport
The best one-way flight to Ontario from United States in the past 72 hours is $74. The best round-trip flight deal from United States to Ontario found on momondo in the last 72 hours is $67.
The fastest flight from United States to Ontario takes 1h 21m
Direct flights go from United States to Ontario every day.
There is 1 airport near Ontario: Ontario (ONT)
Search flight deals

  • When did momondo last update prices for flights from United States to Ontario Airport?

    Prices for flights from United States to Ontario Airport refresh daily.

  • How many operators does momondo search for flights from United States to Ontario Airport?

  • How old do you have to be to fly from United States to Ontario Airport?

    The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from United States 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.

  • What is the most popular plane model from United States to Ontario?

Best airlines flying from United States to Ontario

Compare and see reviews for airlines that fly from United States to Ontario with momondo
Airline
Rating
Free Cancellation
Price
FrontierPriceFrom $38Free CancellationRating
5.8
3,114 reviews
Search Frontier flights
Spirit AirlinesPriceFrom $44Free CancellationRating
6.3
8,139 reviews
Search Spirit Airlines flights
United AirlinesPriceFrom $58Free CancellationRating
7.4
9,015 reviews
Search United Airlines flights
Alaska AirlinesPriceFrom $59Free CancellationRating
8.0
11,281 reviews
Search Alaska Airlines flights
SouthwestPriceFrom $84Free CancellationRating
8.0
4,236 reviews
Search Southwest flights
DeltaPriceFrom $108Free CancellationRating
7.9
8,007 reviews
Search Delta flights
American AirlinesPriceFrom $186Free CancellationRating
7.2
11,049 reviews
Search American Airlines flights
JetBluePriceFrom $250Free CancellationRating
7.2
2,906 reviews
Search JetBlue flights

Why use momondo?

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

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

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

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

How can momondo help me find flights from United States to Ontario?

Once all potential United States to Ontario flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.

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

Price alerts on flights to Ontario from United States are quick and easy to set up on momondo. Simply perform a search and select the price alert feature. It is as simple as that.

An easier way to manage your Ontario trip

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Sat 12/13
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