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Cheap flights from Philadelphia to Los Angeles from $118

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Philadelphia to Los Angeles departing on 8/7. 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

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Find the cheapest flights from Philadelphia to Los Angeles

Cheap round-trip flights

Enter your travel dates to find the best prices.
Frontier Logo
11:00 am - 7:51 pm
PHL
-
ONT
11h 51m
1 stop
Frontier Logo
6:47 pm - 10:30 am
ONT
-
PHL
12h 43m
1 stop
$306Frontier
Wed, Jun 24 - Fri, Jun 26
Frontier Logo
11:00 am - 7:51 pm
PHL
-
ONT
11h 51m
1 stop
Frontier Logo
11:58 am - 6:27 am
ONT
-
PHL
15h 29m
1 stop
$307Frontier
Sat, Jun 27 - Mon, Jun 29
Delta Logo
7:20 am - 12:05 pm
PHL
-
ONT
7h 45m
1 stop
Delta Logo
6:01 pm - 5:40 am
ONT
-
PHL
8h 39m
1 stop
$308Delta
Wed, Aug 19 - Wed, Aug 26
Frontier Logo
8:37 pm - 10:05 am
PHL
-
ONT
16h 28m
1 stop
Frontier Logo
6:00 am - 11:49 am
ONT
-
PHL
26h 49m
1 stop
$309Frontier
Fri, Jun 19 - Sun, Aug 2
Frontier Logo
11:00 am - 7:51 pm
PHL
-
ONT
11h 51m
1 stop
Frontier Logo
6:47 pm - 10:30 am
ONT
-
PHL
12h 43m
1 stop
$310Frontier
Sun, Jun 21 - Fri, Jun 26
Frontier Logo
12:44 pm - 11:50 pm
PHL
-
ONT
14h 06m
1 stop
Frontier Logo
8:17 am - 7:29 pm
ONT
-
PHL
8h 12m
1 stop
$311Frontier
Tue, Jul 14 - Sat, Jul 25
Frontier Logo
11:06 am - 8:03 am
PHL
-
ONT
23h 57m
1 stop
Frontier Logo
6:47 pm - 10:30 am
ONT
-
PHL
12h 43m
1 stop
$313Frontier
Wed, Aug 5 - Wed, Aug 26
Frontier Logo
11:06 am - 8:03 am
PHL
-
ONT
23h 57m
1 stop
Frontier Logo
8:17 am - 7:29 pm
ONT
-
PHL
8h 12m
1 stop
$314Frontier
Mon, Jul 13 - Sat, Jul 18
Frontier Logo
11:00 am - 7:51 pm
PHL
-
ONT
11h 51m
1 stop
Frontier Logo
3:34 pm - 6:27 am
ONT
-
PHL
11h 53m
1 stop
$315Frontier
Sun, Jun 28 - Thu, Jul 2
Frontier Logo
7:00 am - 5:52 pm
PHL
-
ONT
13h 52m
1 stop
Frontier Logo
3:34 pm - 6:27 am
ONT
-
PHL
11h 53m
1 stop
$316Frontier
Fri, Jun 26 - Mon, Jun 29

Frontier flights from Philadelphia to Ontario

Our best Frontier deals on Philadelphia to Ontario flight tickets
Frontier
Jun 24
PHL11:00 amPhiladelphia
11h 51m
1 stop
ONT7:51 pmOntario
Jun 26
ONT6:47 pmOntario
12h 43m
1 stop
PHL10:30 amPhiladelphia
$306
Frontier
Jun 27
PHL11:00 amPhiladelphia
11h 51m
1 stop
ONT7:51 pmOntario
Jun 29
ONT11:58 amOntario
15h 29m
1 stop
PHL6:27 amPhiladelphia
$307
Frontier
Jun 19
PHL8:37 pmPhiladelphia
16h 28m
1 stop
ONT10:05 amOntario
Aug 2
ONT6:00 amOntario
26h 49m
1 stop
PHL11:49 amPhiladelphia
$309

Delta flights from Philadelphia to Ontario

Our best Delta deals on Philadelphia to Ontario flight tickets
Delta
Aug 19
PHL7:20 amPhiladelphia
7h 45m
1 stop
ONT12:05 pmOntario
Aug 26
ONT6:01 pmOntario
8h 39m
1 stop
PHL5:40 amPhiladelphia
$308
Delta
Aug 20
PHL7:00 pmPhiladelphia
7h 34m
1 stop
ONT11:34 pmOntario
Aug 23
ONT10:00 pmOntario
8h 38m
1 stop
PHL9:38 amPhiladelphia
$320
Delta
Aug 21
PHL7:00 pmPhiladelphia
7h 34m
1 stop
ONT11:34 pmOntario
Aug 28
ONT5:05 pmOntario
10h 00m
1 stop
PHL6:05 amPhiladelphia
$327

momondo Fare Finder

 
Customize your flight search to find flights from Philadelphia 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 June 4, 2026.
Use the filters below to find and compare flights from Philadelphia to Ontario that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Wed 6/24

11:00 am-7:51 pm

1 stop11h 51m

Ontario

Fri 6/26

6:47 pm-10:30 am

1 stop12h 43m

$306

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Sat 6/27

11:00 am-7:51 pm

1 stop11h 51m

Ontario

Mon 6/29

11:58 am-6:27 am

1 stop15h 29m

$307
Quickest round-trip

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Wed 8/19

7:20 am-12:05 pm

1 stop7h 45m

Ontario

Wed 8/26

6:01 pm-5:40 am

1 stop8h 39m

$308

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Fri 6/19

8:37 pm-10:05 am

1 stop16h 28m

Ontario

Sun 8/2

6:00 am-11:49 am

1 stop26h 49m

$309

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Sun 6/21

11:00 am-7:51 pm

1 stop11h 51m

Ontario

Fri 6/26

6:47 pm-10:30 am

1 stop12h 43m

$310

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Tue 7/14

12:44 pm-11:50 pm

1 stop14h 06m

Ontario

Sat 7/25

8:17 am-7:29 pm

1 stop8h 12m

$311

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Wed 8/5

11:06 am-8:03 am

1 stop23h 57m

Ontario

Wed 8/26

6:47 pm-10:30 am

1 stop12h 43m

$313

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Mon 7/13

11:06 am-8:03 am

1 stop23h 57m

Ontario

Sat 7/18

8:17 am-7:29 pm

1 stop8h 12m

$314

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Sun 6/28

11:00 am-7:51 pm

1 stop11h 51m

Ontario

Thu 7/2

3:34 pm-6:27 am

1 stop11h 53m

$315

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Fri 6/26

7:00 am-5:52 pm

1 stop13h 52m

Ontario

Mon 6/29

3:34 pm-6:27 am

1 stop11h 53m

$316

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to Los Angeles from

How to get the cheapest flight ticket from Philadelphia 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 typical price of a round-trip flight between Philadelphia and Ontario?

What is the cheapest month to fly to Ontario?

In general, May is the cheapest month to fly from Philadelphia to Ontario. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $355. If you aren’t able to travel during the month of May, then book flights to Ontario from Philadelphia during September instead. Flights to Ontario in September, while not as cheap as those in May, still average around $359.

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

You are more likely to see cheaper flights to Ontario from Philadelphia when booking weeks ahead of your departure date. In general, you can expect to find flights to Ontario for around $414 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Ontario from Philadelphia for as low as $324 on momondo.

Can stopping save me money on Philadelphia to Ontario flights?

You could potentially save up to 29% on your flight if you consider stops on a Philadelphia to Ontario flight.

How have Philadelphia to Ontario flight prices changed over time?

As of June 2026, prices for Philadelphia to Ontario flights are approximately 30% more expensive when compared to flights at the same time last year.

When to book flights from Philadelphia to Ontario

Are you open to changing your travel dates? Check out the ideal times to fly from Philadelphia to Ontario according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap Philadelphia to Ontario (PHL to ONT) flight deals and tips

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

Fastest flight time

7h 34m

Direct flights

None
The fastest flight from Philadelphia to Ontario takes 7h 34m
There are no direct flights from Philadelphia to Ontario. There are no popular flight routes from Philadelphia to Ontario.
Search flight deals

Frequently asked questions about flying from Philadelphia to Ontario

  • How far is Philadelphia to Ontario by plane?

    Ontario is 2355.5 mi away from Philadelphia. Flights usually cover this in 7h 34m, depending on flying conditions and air traffic around both airports.

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

    Prices for flights from Philadelphia Airport to Ontario Airport refresh daily.

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

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

    Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Philadelphia Airport to Ontario Airport.

  • What documentation or ID do you need to fly to Ontario Airport?

    The required travel and health documents for your Ontario Airport trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Ontario Airport. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

  • What is the most popular airline from Philadelphia to Ontario?

Best airlines flying from Philadelphia to Ontario

Compare and see reviews for airlines that fly from Philadelphia to Ontario with momondo
Airline
Rating
Free Cancellation
Price
FrontierPriceFrom $155Free CancellationRating
5.6
2,914 reviews
Search Frontier flights
DeltaPriceFrom $256Free CancellationRating
7.8
8,395 reviews
Search Delta flights
United AirlinesPriceFrom $290Free CancellationRating
7.4
9,773 reviews
Search United Airlines flights
American AirlinesPriceFrom $300Free CancellationRating
7.1
11,641 reviews
Search American Airlines flights
SouthwestPriceFrom $374Free CancellationRating
8.0
4,256 reviews
Search Southwest flights

  • United Airlines Flights From Philadelphia to Ontario

    United Airlines operates around 6 flights from Philadelphia to Ontario every week. The average price of these flights found in the last 72 hours has been $514, but momondo users have found United Airlines deals from Philadelphia to Ontario from as low as $290 round-trip. United Airlines has been scored 7.4/10 in 9,774 reviews.

Why use momondo?

Why should I use momondo to find a flight deal from Philadelphia 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 Philadelphia to Ontario for you.

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

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

How can momondo help me find flights from Philadelphia to Ontario?

momondo provides multiple filters to help you find the best flight to Ontario from Philadelphia. Filter by price, airline, airports, cabin, aircraft, payment method, number of stops and more.

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

If you are simply researching potential flights to Ontario, momondo offers a useful price alert feature which will track prices for flights to Ontario from Philadelphia and alert you when they change.

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