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Cheap flights from the United States to Los Angeles from $39

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 10/15. 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

United Airlines Logo
10:45 am - 12:13 pmSFO-ONT
1h 28mnonstop
United Airlines Logo
1:53 pm - 3:11 pmONT-SFO
1h 18mnonstop
$72United Airlines
Find Deal
Sat, Oct 25 - Sat, Oct 25
Frontier Logo
10:38 pm - 12:07 amSFO-ONT
1h 29mnonstop
Frontier Logo
10:50 pm - 12:19 amONT-SFO
1h 29mnonstop
$74Frontier
Find Deal
Thu, Oct 23 - Mon, Oct 27
Alaska Airlines Logo
10:30 am - 12:46 pmPDX-ONT
2h 16mnonstop
Alaska Airlines Logo
7:10 am - 9:41 amONT-PDX
2h 31mnonstop
$130Alaska Airlines
Find Deal
Tue, Dec 9 - Sat, Dec 13
Delta Logo
5:00 pm - 9:20 pmPDX-ONT
4h 20m1 stop
Delta Logo
5:50 pm - 10:40 pmONT-PDX
4h 50m1 stop
$154Delta
Find Deal
Wed, Nov 5 - Sat, Nov 8
Delta Logo
7:15 pm - 11:39 pmPDX-ONT
4h 24m1 stop
Delta Logo
7:35 am - 12:49 pmONT-PDX
5h 14m1 stop
$157Delta
Find Deal
Tue, Oct 21 - Tue, Oct 28
American Airlines Logo
9:35 pm - 10:42 pmDFW-ONT
3h 07mnonstop
American Airlines Logo
2:51 pm - 7:53 pmONT-DFW
3h 02mnonstop
$159American Airlines
Find Deal
Tue, Oct 28 - Sat, Nov 1
American Airlines Logo
10:38 am - 12:01 pmPHX-ONT
1h 23mnonstop
American Airlines Logo
1:00 pm - 2:19 pmONT-PHX
1h 19mnonstop
$197American Airlines
Find Deal
Tue, Oct 21 - Tue, Oct 28
Southwest Logo
11:05 am - 12:20 pmPHX-ONT
1h 15mnonstop
Southwest Logo
6:00 am - 9:55 amONT-PHX
3h 55m1 stop
$207Southwest
Find Deal
Tue, Oct 21 - Tue, Oct 28
Southwest Logo
7:25 am - 10:35 amPHX-ONT
3h 10m1 stop
Southwest Logo
1:50 pm - 3:05 pmONT-PHX
1h 15mnonstop
$224Southwest
Find Deal
Wed, Oct 22 - Sat, Oct 25
Alaska Airlines Logo
7:30 am - 3:17 pmEWR-ONT
10h 47m1 stop
Alaska Airlines Logo
6:00 am - 6:29 pmONT-EWR
9h 29m1 stop
$230Alaska Airlines
Find Deal
Wed, Nov 12 - Sat, Nov 15

Frontier flights from United States to Ontario

Our best Frontier deals on United States to Ontario flight tickets
Frontier
Oct 2
SFO10:11 pmSan Francisco
1h 27m
ONT11:38 pmOntario
Oct 3
ONT10:40 pmOntario
1h 35m
SFO12:15 amSan Francisco
$73
Find similar
Frontier
Oct 23
SFO10:38 pmSan Francisco
1h 29m
ONT12:07 amOntario
Oct 27
ONT10:50 pmOntario
1h 29m
SFO12:19 amSan Francisco
$74
Find similar
Frontier
Oct 23
SFO10:38 pmSan Francisco
1h 29m
ONT12:07 amOntario
Oct 27
ONT10:50 pmOntario
1h 29m
SFO12:19 amSan Francisco
$75
Find similar

JetBlue flights from United States to Ontario

Our best JetBlue deals on United States to Ontario flight tickets
JetBlue
Oct 16
JFK6:35 pmNew York John F Kennedy Intl
5h 54m
ONT9:29 pmOntario
Oct 22
ONT10:56 pmOntario
5h 22m
JFK7:18 amNew York John F Kennedy Intl
$244
Find similar
JetBlue
Oct 16
JFK6:35 pmNew York John F Kennedy Intl
5h 54m
ONT9:29 pmOntario
Oct 22
ONT10:56 pmOntario
5h 22m
JFK7:18 amNew York John F Kennedy Intl
$247
Find similar
JetBlue
Oct 16
JFK6:35 pmNew York John F Kennedy Intl
5h 54m
ONT9:29 pmOntario
Oct 25
ONT10:56 pmOntario
5h 22m
JFK7:18 amNew York John F Kennedy Intl
$252
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 September 23, 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

Sat 10/25

10:45 am-12:13 pm

Nonstop1h 28m

Ontario

Sat 10/25

1:53 pm-3:11 pm

Nonstop1h 18m

$72

San FranciscoOntario

SFO - ONT

SFOONT

San Francisco

Thu 10/23

10:38 pm-12:07 am

Nonstop1h 29m

Ontario

Mon 10/27

10:50 pm-12:19 am

Nonstop1h 29m

$74

PortlandOntario

PDX - ONT

PDXONT

Portland

Tue 12/9

10:30 am-12:46 pm

Nonstop2h 16m

Ontario

Sat 12/13

7:10 am-9:41 am

Nonstop2h 31m

$130

PortlandOntario

PDX - ONT

PDXONT

Portland

Wed 11/5

5:00 pm-9:20 pm

1 stop4h 20m

Ontario

Sat 11/8

5:50 pm-10:40 pm

1 stop4h 50m

$154

PortlandOntario

PDX - ONT

PDXONT

Portland

Tue 10/21

7:15 pm-11:39 pm

1 stop4h 24m

Ontario

Tue 10/28

7:35 am-12:49 pm

1 stop5h 14m

$157

DallasOntario

DFW - ONT

DFWONT

Dallas/Fort Worth

Tue 10/28

9:35 pm-10:42 pm

Nonstop3h 07m

Ontario

Sat 11/1

2:51 pm-7:53 pm

Nonstop3h 02m

$159

PhoenixOntario

PHX - ONT

PHXONT

Phoenix Sky Harbor Intl

Tue 10/21

10:38 am-12:01 pm

Nonstop1h 23m

Ontario

Tue 10/28

1:00 pm-2:19 pm

Nonstop1h 19m

$197

PhoenixOntario

PHX - ONT

PHXONT

Phoenix Sky Harbor Intl

Tue 10/21

11:05 am-12:20 pm

Nonstop1h 15m

Ontario

Tue 10/28

6:00 am-9:55 am

1 stop3h 55m

$207

PhoenixOntario

PHX - ONT

PHXONT

Phoenix Sky Harbor Intl

Wed 10/22

7:25 am-10:35 am

1 stop3h 10m

Ontario

Sat 10/25

1:50 pm-3:05 pm

Nonstop1h 15m

$224

NewarkOntario

EWR - ONT

EWRONT

Newark

Wed 11/12

7:30 am-3:17 pm

1 stop10h 47m

Ontario

Sat 11/15

6:00 am-6:29 pm

1 stop9h 29m

$230

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, July 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 $292. If you aren’t able to travel during the month of July, then book flights to Ontario from United States during September instead. Flights to Ontario in September, while not as cheap as those in July, still average around $292.

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 $306. This is often the case because there is less demand to fly during this day of the week. When flying out on a Tuesday, the most expensive travel day of the week, you can expect to see flight prices from United States to Ontario for around $372.

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 United States to Ontario when you can find flight prices for as low as $332. 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 $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 $359 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 $236 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

$54

Fastest flight time

1h 10m

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 $54. The best round-trip flight deal from United States to Ontario found on momondo in the last 72 hours is $78.
The fastest flight from United States to Ontario takes 1h 10m
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 $39Free CancellationRating
5.8
3,165 reviews
Search Frontier flights
Spirit AirlinesPriceFrom $42Free CancellationRating
6.3
8,041 reviews
Search Spirit Airlines flights
United AirlinesPriceFrom $58Free CancellationRating
7.4
8,926 reviews
Search United Airlines flights
Alaska AirlinesPriceFrom $59Free CancellationRating
8.0
10,000 reviews
Search Alaska Airlines flights
DeltaPriceFrom $75Free CancellationRating
7.9
7,974 reviews
Search Delta flights
SouthwestPriceFrom $84Free CancellationRating
8.0
4,244 reviews
Search Southwest flights
American AirlinesPriceFrom $186Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights
JetBluePriceFrom $250Free CancellationRating
7.2
2,912 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

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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