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Cheap flights from Philadelphia to Los Angeles from $71

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 5/12. 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 Philadelphia to Los Angeles

Cheap round-trip flights

Enter your travel dates to find the best prices.
Frontier Logo
8:25 pm - 7:31 am
PHL
-
ONT
14h 06m
1 stop
Frontier Logo
5:33 pm - 5:34 am
ONT
-
PHL
9h 01m
1 stop
$195Frontier
Wed, Apr 15 - Fri, Apr 24
Frontier Logo
8:25 pm - 7:31 am
PHL
-
ONT
14h 06m
1 stop
Frontier Logo
2:44 pm - 5:13 am
ONT
-
PHL
11h 29m
1 stop
$200Frontier
Thu, Apr 23 - Tue, Apr 28
Frontier Logo
8:25 pm - 7:31 am
PHL
-
ONT
14h 06m
1 stop
Frontier Logo
8:59 pm - 5:34 am
ONT
-
PHL
29h 35m
2 stops
$204Frontier
Wed, Apr 22 - Mon, Apr 27
Frontier Logo
8:25 pm - 11:56 pm
PHL
-
ONT
30h 31m
1 stop
Frontier Logo
12:59 am - 5:34 am
ONT
-
PHL
25h 35m
1 stop
$205Frontier
Fri, Apr 10 - Tue, Apr 14
Frontier Logo
8:25 pm - 11:56 pm
PHL
-
ONT
30h 31m
1 stop
Frontier Logo
7:29 pm - 5:13 am
ONT
-
PHL
6h 44m
1 stop
$206Frontier
Tue, Apr 7 - Tue, Apr 14
Frontier Logo
7:15 am - 2:29 pm
PHL
-
ONT
10h 14m
1 stop
Frontier Logo
6:05 am - 4:37 pm
ONT
-
PHL
7h 32m
1 stop
$209Frontier
Sun, Mar 1 - Thu, Mar 5
Frontier Logo
8:25 pm - 11:56 pm
PHL
-
ONT
30h 31m
1 stop
Frontier Logo
9:02 pm - 5:13 am
ONT
-
PHL
29h 11m
1 stop
$211Frontier
Thu, Apr 9 - Mon, Apr 13
Frontier Logo
7:15 am - 2:29 pm
PHL
-
ONT
10h 14m
1 stop
Frontier Logo
6:15 am - 5:31 am
ONT
-
PHL
20h 16m
1 stop
$219Frontier
Sun, Mar 1 - Thu, Mar 12
Frontier Logo
5:40 am - 2:29 pm
PHL
-
ONT
11h 49m
1 stop
Frontier Logo
6:15 am - 5:31 am
ONT
-
PHL
20h 16m
1 stop
$220Frontier
Thu, Mar 5 - Mon, Mar 9
Frontier Logo
6:00 am - 2:30 pm
PHL
-
ONT
11h 30m
1 stop
Frontier Logo
6:05 am - 4:37 pm
ONT
-
PHL
7h 32m
1 stop
$221Frontier
Mon, Feb 23 - Thu, Feb 26

Frontier flights from Philadelphia to Ontario

Our best Frontier deals on Philadelphia to Ontario flight tickets
Frontier
Apr 15
PHL8:25 pmPhiladelphia
14h 06m
1 stop
ONT7:31 amOntario
Apr 24
ONT5:33 pmOntario
9h 01m
1 stop
PHL5:34 amPhiladelphia
$195
Frontier
Apr 23
PHL8:25 pmPhiladelphia
14h 06m
1 stop
ONT7:31 amOntario
Apr 28
ONT2:44 pmOntario
11h 29m
1 stop
PHL5:13 amPhiladelphia
$200
Frontier
Apr 22
PHL8:25 pmPhiladelphia
14h 06m
1 stop
ONT7:31 amOntario
Apr 27
ONT8:59 pmOntario
29h 35m
2 stops
PHL5:34 amPhiladelphia
$204

Delta flights from Philadelphia to Ontario

Our best Delta deals on Philadelphia to Ontario flight tickets
Delta
Mar 4
PHL7:00 amPhiladelphia
8h 07m
1 stop
ONT12:07 pmOntario
Mar 7
ONT1:15 pmOntario
8h 09m
1 stop
PHL12:24 amPhiladelphia
$297
Delta
Mar 10
PHL9:41 amPhiladelphia
9h 47m
2 stops
ONT4:28 pmOntario
Mar 17
ONT12:57 pmOntario
9h 00m
1 stop
PHL12:57 amPhiladelphia
$302
Delta
Feb 25
PHL6:55 amPhiladelphia
8h 07m
1 stop
ONT12:02 pmOntario
Mar 2
ONT1:10 pmOntario
7h 36m
1 stop
PHL11:46 pmPhiladelphia
$447

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 February 11, 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

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Wed 4/15

8:25 pm-7:31 am

1 stop14h 06m

Ontario

Fri 4/24

5:33 pm-5:34 am

1 stop9h 01m

$195

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Thu 4/23

8:25 pm-7:31 am

1 stop14h 06m

Ontario

Tue 4/28

2:44 pm-5:13 am

1 stop11h 29m

$200

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Wed 4/22

8:25 pm-7:31 am

1 stop14h 06m

Ontario

Mon 4/27

8:59 pm-5:34 am

2 stops29h 35m

$204

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Fri 4/10

8:25 pm-11:56 pm

1 stop30h 31m

Ontario

Tue 4/14

12:59 am-5:34 am

1 stop25h 35m

$205

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Tue 4/7

8:25 pm-11:56 pm

1 stop30h 31m

Ontario

Tue 4/14

7:29 pm-5:13 am

1 stop6h 44m

$206

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Sun 3/1

7:15 am-2:29 pm

1 stop10h 14m

Ontario

Thu 3/5

6:05 am-4:37 pm

1 stop7h 32m

$209

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Thu 4/9

8:25 pm-11:56 pm

1 stop30h 31m

Ontario

Mon 4/13

9:02 pm-5:13 am

1 stop29h 11m

$211

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Sun 3/1

7:15 am-2:29 pm

1 stop10h 14m

Ontario

Thu 3/12

6:15 am-5:31 am

1 stop20h 16m

$219

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Thu 3/5

5:40 am-2:29 pm

1 stop11h 49m

Ontario

Mon 3/9

6:15 am-5:31 am

1 stop20h 16m

$220

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Mon 2/23

6:00 am-2:30 pm

1 stop11h 30m

Ontario

Thu 2/26

6:05 am-4:37 pm

1 stop7h 32m

$221

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 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 March instead. Flights to Ontario in March, while not as cheap as those in May, still average around $365.

How far in advance should I book a flight 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 $409 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 $277 on momondo.

Can stopping save me money on Philadelphia to Ontario flights?

You could potentially save up to 47% 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 February 2026, prices for Philadelphia to Ontario flights are approximately 38% cheaper 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 49m

Direct flights

None
The fastest flight from Philadelphia to Ontario takes 7h 49m
There are no direct flights from Philadelphia to Ontario. There are no popular flight routes from Philadelphia to Ontario.
Search flight deals

  • How far is Philadelphia to Ontario by plane?

    Ontario is 2355.5 mi away from Philadelphia. Flights usually cover this in 7h 49m, 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 $150Free CancellationRating
5.7
3,052 reviews
Search Frontier flights
DeltaPriceFrom $208Free CancellationRating
7.9
8,177 reviews
Search Delta flights
United AirlinesPriceFrom $305Free CancellationRating
7.4
9,276 reviews
Search United Airlines flights
American AirlinesPriceFrom $306Free CancellationRating
7.2
11,267 reviews
Search American Airlines flights
SouthwestPriceFrom $367Free CancellationRating
8.0
4,280 reviews
Search Southwest flights

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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