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Cheap flights from the United States to Los Angeles from $25

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 11/10. 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
0 bags

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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

Frontier Logo
10:11 pm - 11:38 pmSFO-ONT
1h 27mnonstop
Frontier Logo
10:13 pm - 11:48 pmONT-SFO
1h 35mnonstop
$56Frontier
Find Deal
Thu, Sep 25 - Sun, Sep 28
Frontier Logo
10:29 pm - 11:50 pmDEN-ONT
2h 21mnonstop
Frontier Logo
12:59 am - 4:20 amONT-DEN
2h 21mnonstop
$59Frontier
Find Deal
Fri, Oct 24 - Sun, Oct 26
United Airlines Logo
10:45 am - 12:13 pmSFO-ONT
1h 28mnonstop
United Airlines Logo
6:50 pm - 8:09 pmONT-SFO
1h 19mnonstop
$97United Airlines
Find Deal
Tue, Aug 26 - Tue, Sep 2
United Airlines Logo
4:17 pm - 5:37 pmSFO-ONT
1h 20mnonstop
United Airlines Logo
6:00 am - 7:19 amONT-SFO
1h 19mnonstop
$128United Airlines
Find Deal
Wed, Aug 27 - Sun, Aug 31
Delta Logo
8:05 pm - 10:49 pmSEA-ONT
2h 44mnonstop
Delta Logo
11:48 am - 2:45 pmONT-SEA
2h 57mnonstop
$157Delta
Find Deal
Tue, Oct 21 - Tue, Nov 4
Southwest Logo
7:50 am - 9:05 amHOU-ONT
3h 15mnonstop
Southwest Logo
6:20 am - 11:30 amONT-HOU
3h 10mnonstop
$191Southwest
Find Deal
Fri, Sep 26 - Mon, Sep 29
Southwest Logo
7:25 pm - 10:45 pmHOU-ONT
5h 20m1 stop
Southwest Logo
6:20 am - 11:30 amONT-HOU
3h 10mnonstop
$201Southwest
Find Deal
Fri, Sep 26 - Mon, Sep 29
American Airlines Logo
8:25 pm - 12:07 amHOU-ONT
5h 42m1 stop
American Airlines Logo
11:59 pm - 8:20 amONT-HOU
6h 21m1 stop
$211American Airlines
Find Deal
Fri, Aug 29 - Sun, Aug 31
American Airlines Logo
10:14 am - 1:39 pmHOU-ONT
5h 25m1 stop
American Airlines Logo
11:59 pm - 8:34 amONT-HOU
6h 35m1 stop
$221American Airlines
Find Deal
Tue, Aug 26 - Tue, Sep 2
Delta Logo
1:05 pm - 7:11 pmHOU-ONT
8h 06m1 stop
Delta Logo
11:45 am - 10:31 pmONT-HOU
8h 46m1 stop
$237Delta
Find Deal
Fri, Sep 5 - Tue, Sep 9

JetBlue flights from United States to Ontario

Our best JetBlue deals on United States to Ontario flight tickets
JetBlue
Aug 30
JFK6:50 pmNew York John F Kennedy Intl
6h 09m
ONT9:59 pmOntario
Sep 6
ONT10:56 pmOntario
5h 22m
JFK7:18 amNew York John F Kennedy Intl
$248
Find similar
JetBlue
Aug 30
JFK6:50 pmNew York John F Kennedy Intl
6h 09m
ONT9:59 pmOntario
Sep 6
ONT10:56 pmOntario
5h 22m
JFK7:18 amNew York John F Kennedy Intl
$254
Find similar
JetBlue
Aug 23
JFK6:50 pmNew York John F Kennedy Intl
6h 09m
ONT9:59 pmOntario
Sep 2
ONT11:59 pmOntario
5h 31m
JFK8:30 amNew York John F Kennedy Intl
$257
Find similar

Frontier flights from United States to Ontario

Our best Frontier deals on United States to Ontario flight tickets
Frontier
Sep 25
SFO10:11 pmSan Francisco
1h 27m
ONT11:38 pmOntario
Sep 28
ONT10:13 pmOntario
1h 35m
SFO11:48 pmSan Francisco
$56
Find similar
Frontier
Oct 24
DEN10:29 pmDenver Intl
2h 21m
ONT11:50 pmOntario
Oct 26
ONT12:59 amOntario
2h 21m
DEN4:20 amDenver Intl
$59
Find similar
Frontier
Oct 16
SFO10:11 pmSan Francisco
1h 29m
ONT11:40 pmOntario
Oct 20
ONT9:41 pmOntario
1h 32m
SFO11:13 pmSan Francisco
$63
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 July 31, 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

San FranciscoOntario

SFO - ONT

SFOONT

San Francisco

Thu 9/25

10:11 pm-11:38 pm

Nonstop1h 27m

Ontario

Sun 9/28

10:13 pm-11:48 pm

Nonstop1h 35m

$56

DenverOntario

DEN - ONT

DENONT

Denver Intl

Fri 10/24

10:29 pm-11:50 pm

Nonstop2h 21m

Ontario

Sun 10/26

12:59 am-4:20 am

Nonstop2h 21m

$59

San FranciscoOntario

SFO - ONT

SFOONT

San Francisco

Tue 8/26

10:45 am-12:13 pm

Nonstop1h 28m

Ontario

Tue 9/2

6:50 pm-8:09 pm

Nonstop1h 19m

$97

San FranciscoOntario

SFO - ONT

SFOONT

San Francisco

Wed 8/27

4:17 pm-5:37 pm

Nonstop1h 20m

Ontario

Sun 8/31

6:00 am-7:19 am

Nonstop1h 19m

$128

SeattleOntario

SEA - ONT

SEAONT

Seattle/Tacoma Intl

Tue 10/21

8:05 pm-10:49 pm

Nonstop2h 44m

Ontario

Tue 11/4

11:48 am-2:45 pm

Nonstop2h 57m

$157

HoustonOntario

HOU - ONT

HOUONT

Houston Hobby

Fri 9/26

7:50 am-9:05 am

Nonstop3h 15m

Ontario

Mon 9/29

6:20 am-11:30 am

Nonstop3h 10m

$191

HoustonOntario

HOU - ONT

HOUONT

Houston Hobby

Fri 9/26

7:25 pm-10:45 pm

1 stop5h 20m

Ontario

Mon 9/29

6:20 am-11:30 am

Nonstop3h 10m

$201

HoustonOntario

HOU - ONT

HOUONT

Houston Hobby

Fri 8/29

8:25 pm-12:07 am

1 stop5h 42m

Ontario

Sun 8/31

11:59 pm-8:20 am

1 stop6h 21m

$211

HoustonOntario

HOU - ONT

HOUONT

Houston Hobby

Tue 8/26

10:14 am-1:39 pm

1 stop5h 25m

Ontario

Tue 9/2

11:59 pm-8:34 am

1 stop6h 35m

$221

HoustonOntario

HOU - ONT

HOUONT

Houston Hobby

Fri 9/5

1:05 pm-7:11 pm

1 stop8h 06m

Ontario

Tue 9/9

11:45 am-10:31 pm

1 stop8h 46m

$237

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 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 July instead. Flights to Ontario in July, while not as cheap as those in September, still average around $297.

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 $301. 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 $376.

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

In the evening is the cheapest time of day to fly from United States to Ontario when you can find flight prices for as low as $317. Flying to Ontario in the evening 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 San Francisco 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 $358 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 $239 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

$25

Fastest flight time

1h 20m

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 $25. The best round-trip flight deal from United States to Ontario found on momondo in the last 72 hours is $56.
The fastest flight from United States to Ontario takes 1h 20m
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
Spirit AirlinesPriceFrom $23Free CancellationRating
6.3
8,049 reviews
Search Spirit Airlines flights
FrontierPriceFrom $38Free CancellationRating
5.9
3,239 reviews
Search Frontier flights
United AirlinesPriceFrom $58Free CancellationRating
7.4
8,900 reviews
Search United Airlines flights
DeltaPriceFrom $58Free CancellationRating
8.0
7,981 reviews
Search Delta flights
Alaska AirlinesPriceFrom $59Free CancellationRating
8.0
10,000 reviews
Search Alaska Airlines flights
SouthwestPriceFrom $97Free CancellationRating
8.0
4,246 reviews
Search Southwest flights
JetBluePriceFrom $176Free CancellationRating
7.2
2,914 reviews
Search JetBlue flights
American AirlinesPriceFrom $186Free CancellationRating
7.2
10,000 reviews
Search American Airlines 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

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.
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