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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 8/6. 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

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from Philadelphia to Los Angeles

Cheap round-trip flights

Enter your travel dates to find the best prices.
Frontier Logo
7:00 am - 4:22 pm
PHL
-
ONT
12h 22m
1 stop
Frontier Logo
3:40 pm - 6:30 am
ONT
-
PHL
11h 50m
1 stop
$240Frontier
Thu, Aug 20 - Tue, Aug 25
Frontier Logo
11:06 am - 8:03 am
PHL
-
ONT
23h 57m
1 stop
Frontier Logo
11:47 am - 6:00 am
ONT
-
PHL
15h 13m
1 stop
$241Frontier
Sat, Aug 1 - Sat, Aug 8
Frontier Logo
11:06 am - 3:54 pm
PHL
-
ONT
7h 48m
1 stop
Frontier Logo
4:09 pm - 6:00 am
ONT
-
PHL
10h 51m
1 stop
$242Frontier
Mon, Jul 27 - Thu, Aug 13
Frontier Logo
12:54 pm - 11:50 pm
PHL
-
ONT
13h 56m
1 stop
Frontier Logo
1:38 pm - 6:00 am
ONT
-
PHL
13h 22m
1 stop
$244Frontier
Mon, Jul 27 - Wed, Jul 29
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
$246Frontier
Sat, Aug 1 - Sat, Aug 8
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
$247Frontier
Tue, Aug 4 - Fri, Aug 14
Frontier Logo
8:37 pm - 10:04 am
PHL
-
ONT
16h 27m
1 stop
Frontier Logo
8:17 am - 7:29 pm
ONT
-
PHL
8h 12m
1 stop
$248Frontier
Thu, Jul 30 - Mon, Aug 10
Frontier Logo
11:06 am - 8:03 am
PHL
-
ONT
23h 57m
1 stop
Frontier Logo
3:40 pm - 6:00 am
ONT
-
PHL
11h 20m
1 stop
$249Frontier
Wed, Jul 29 - Tue, Aug 4
Frontier Logo
8:44 pm - 10:43 am
PHL
-
ONT
16h 59m
1 stop
Frontier Logo
6:00 am - 5:36 am
ONT
-
PHL
20h 36m
1 stop
$250Frontier
Wed, Sep 16 - Tue, Sep 22
Frontier Logo
11:06 am - 3:54 pm
PHL
-
ONT
7h 48m
1 stop
Frontier Logo
5:08 pm - 6:00 am
ONT
-
PHL
9h 52m
1 stop
$251Frontier
Fri, Jul 24 - Wed, Aug 12

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Frontier flights from Philadelphia to Ontario

Our best Frontier deals on Philadelphia to Ontario flight tickets
Frontier
Aug 20
PHL7:00 amPhiladelphia
28h 03m
1 stop
ONT8:03 amOntario
Aug 25
ONT3:40 pmOntario
11h 50m
1 stop
PHL6:30 amPhiladelphia
$240
Frontier
Aug 1
PHL11:06 amPhiladelphia
23h 57m
1 stop
ONT8:03 amOntario
Aug 8
ONT11:47 amOntario
15h 13m
1 stop
PHL6:00 amPhiladelphia
$241
Frontier
Jul 27
PHL11:06 amPhiladelphia
7h 48m
1 stop
ONT3:54 pmOntario
Aug 13
ONT4:09 pmOntario
10h 51m
1 stop
PHL6:00 amPhiladelphia
$242

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 July 3, 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

Thu 8/20

7:00 am-4:22 pm

1 stop12h 22m

Ontario

Tue 8/25

3:40 pm-6:30 am

1 stop11h 50m

$240

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Sat 8/1

11:06 am-8:03 am

1 stop23h 57m

Ontario

Sat 8/8

11:47 am-6:00 am

1 stop15h 13m

$241

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Mon 7/27

11:06 am-3:54 pm

1 stop7h 48m

Ontario

Thu 8/13

4:09 pm-6:00 am

1 stop10h 51m

$242

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Mon 7/27

12:54 pm-11:50 pm

1 stop13h 56m

Ontario

Wed 7/29

1:38 pm-6:00 am

1 stop13h 22m

$244

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Sat 8/1

11:06 am-8:03 am

1 stop23h 57m

Ontario

Sat 8/8

8:17 am-7:29 pm

1 stop8h 12m

$246

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Tue 8/4

11:06 am-8:03 am

1 stop23h 57m

Ontario

Fri 8/14

8:17 am-7:29 pm

1 stop8h 12m

$247

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Thu 7/30

8:37 pm-10:04 am

1 stop16h 27m

Ontario

Mon 8/10

8:17 am-7:29 pm

1 stop8h 12m

$248

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Wed 7/29

11:06 am-8:03 am

1 stop23h 57m

Ontario

Tue 8/4

3:40 pm-6:00 am

1 stop11h 20m

$249

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Wed 9/16

8:44 pm-10:43 am

1 stop16h 59m

Ontario

Tue 9/22

6:00 am-5:36 am

1 stop20h 36m

$250
Quickest round-trip

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Fri 7/24

11:06 am-3:54 pm

1 stop7h 48m

Ontario

Wed 8/12

5:08 pm-6:00 am

1 stop9h 52m

$251

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 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, September 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 $358. If you aren’t able to travel during the month of September, then book flights to Ontario from Philadelphia during August instead. Flights to Ontario in August, while not as cheap as those in September, still average around $367.

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 $415 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 $285 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 July 2026, prices for Philadelphia to Ontario flights are approximately 6% 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.
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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
2,847 reviews
Search Frontier flights
DeltaPriceFrom $256Free CancellationRating
7.8
8,453 reviews
Search Delta flights
United AirlinesPriceFrom $290Free CancellationRating
7.4
9,927 reviews
Search United Airlines flights
American AirlinesPriceFrom $305Free CancellationRating
7.1
11,764 reviews
Search American Airlines flights
SouthwestPriceFrom $361Free CancellationRating
7.9
4,250 reviews
Search Southwest flights

  • United Airlines Flights From Philadelphia to Ontario

    United Airlines operates around 5 flights from Philadelphia to Ontario every week. The average price of these flights found in the last 72 hours has been $486, 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 9,927 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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