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Cheap flights from Philadelphia to Los Angeles from $90

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 2/9. 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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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 - 11:56 pm
PHL
-
ONT
30h 31m
1 stop
Frontier Logo
6:20 am - 5:31 am
ONT
-
PHL
20h 11m
1 stop
$181Frontier
Tue, Apr 7 - Sat, Apr 11
Frontier Logo
5:47 pm - 11:59 pm
PHL
-
ONT
9h 12m
1 stop
Frontier Logo
8:40 am - 10:24 am
ONT
-
PHL
22h 44m
2 stops
$199Frontier
Thu, Feb 26 - Tue, Mar 3
Frontier Logo
1:13 pm - 6:45 pm
PHL
-
ONT
8h 32m
1 stop
Frontier Logo
6:20 am - 5:31 am
ONT
-
PHL
20h 11m
1 stop
$202Frontier
Thu, Apr 9 - Mon, Apr 13
Frontier Logo
7:18 pm - 9:34 pm
PHL
-
ONT
29h 16m
2 stops
Frontier Logo
6:15 am - 5:31 am
ONT
-
PHL
20h 16m
1 stop
$213Frontier
Mon, Mar 2 - Mon, Mar 9
Frontier Logo
8:30 am - 2:27 pm
PHL
-
ONT
8h 57m
1 stop
Frontier Logo
2:21 pm - 1:12 am
ONT
-
PHL
7h 51m
1 stop
$215Frontier
Mon, Feb 9 - Fri, Feb 20
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
$219Frontier
Thu, Mar 5 - Mon, Mar 9
Frontier Logo
8:00 am - 9:04 pm
PHL
-
ONT
16h 04m
1 stop
Frontier Logo
6:15 am - 5:31 am
ONT
-
PHL
20h 16m
1 stop
$229Frontier
Mon, Mar 9 - Thu, Mar 12
Frontier Logo
5:47 pm - 11:59 pm
PHL
-
ONT
9h 12m
1 stop
Frontier Logo
6:05 am - 4:37 pm
ONT
-
PHL
7h 32m
1 stop
$230Frontier
Thu, Feb 26 - Thu, Mar 5
Frontier Logo
6:00 am - 2:30 pm
PHL
-
ONT
11h 30m
1 stop
Frontier Logo
8:40 am - 4:37 pm
ONT
-
PHL
28h 57m
1 stop
$234Frontier
Mon, Feb 23 - Wed, Feb 25
Frontier Logo
6:00 am - 2:29 pm
PHL
-
ONT
11h 29m
1 stop
Frontier Logo
6:00 am - 5:55 pm
ONT
-
PHL
8h 55m
1 stop
$235Frontier
Thu, Feb 26 - Fri, Feb 27

Frontier flights from Philadelphia to Ontario

Our best Frontier deals on Philadelphia to Ontario flight tickets
Frontier
Apr 7
PHL8:25 pmPhiladelphia
30h 31m
1 stop
ONT11:56 pmOntario
Apr 11
ONT6:20 amOntario
20h 11m
1 stop
PHL5:31 amPhiladelphia
$180
Frontier
Apr 7
PHL8:25 pmPhiladelphia
30h 31m
1 stop
ONT11:56 pmOntario
Apr 11
ONT6:20 amOntario
20h 11m
1 stop
PHL5:31 amPhiladelphia
$181
Frontier
Mar 2
PHL5:47 pmPhiladelphia
9h 12m
1 stop
ONT11:59 pmOntario
Mar 9
ONT6:15 amOntario
20h 16m
1 stop
PHL5:31 amPhiladelphia
$199

Delta flights from Philadelphia to Ontario

Our best Delta deals on Philadelphia to Ontario flight tickets
Delta
Apr 7
PHL6:49 pmPhiladelphia
8h 02m
1 stop
ONT11:51 pmOntario
Apr 8
ONT5:09 pmOntario
9h 32m
1 stop
PHL5:41 amPhiladelphia
$288
Delta
Apr 11
PHL5:40 amPhiladelphia
9h 07m
1 stop
ONT11:47 amOntario
Apr 14
ONT5:05 pmOntario
9h 30m
1 stop
PHL5:35 amPhiladelphia
$293
Delta
Feb 1
PHL6:37 pmPhiladelphia
8h 21m
1 stop
ONT11:58 pmOntario
Feb 5
ONT6:00 amOntario
8h 25m
1 stop
PHL5:25 pmPhiladelphia
$557

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 January 20, 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

Tue 4/7

8:25 pm-11:56 pm

1 stop30h 31m

Ontario

Sat 4/11

6:20 am-5:31 am

1 stop20h 11m

$181

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Thu 2/26

5:47 pm-11:59 pm

1 stop9h 12m

Ontario

Tue 3/3

8:40 am-10:24 am

2 stops22h 44m

$199

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Thu 4/9

1:13 pm-6:45 pm

1 stop8h 32m

Ontario

Mon 4/13

6:20 am-5:31 am

1 stop20h 11m

$202

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Mon 3/2

7:18 pm-9:34 pm

2 stops29h 16m

Ontario

Mon 3/9

6:15 am-5:31 am

1 stop20h 16m

$213

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Mon 2/9

8:30 am-2:27 pm

1 stop8h 57m

Ontario

Fri 2/20

2:21 pm-1:12 am

1 stop7h 51m

$215

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

$219

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Mon 3/9

8:00 am-9:04 pm

1 stop16h 04m

Ontario

Thu 3/12

6:15 am-5:31 am

1 stop20h 16m

$229

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Thu 2/26

5:47 pm-11:59 pm

1 stop9h 12m

Ontario

Thu 3/5

6:05 am-4:37 pm

1 stop7h 32m

$230

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Mon 2/23

6:00 am-2:30 pm

1 stop11h 30m

Ontario

Wed 2/25

8:40 am-4:37 pm

1 stop28h 57m

$234

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Thu 2/26

6:00 am-2:29 pm

1 stop11h 29m

Ontario

Fri 2/27

6:00 am-5:55 pm

1 stop8h 55m

$235

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 $367.

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 $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 $255 on momondo.

Can stopping save me money on Philadelphia to Ontario flights?

You could potentially save up to 10% 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 January 2026, prices for Philadelphia to Ontario flights are approximately 65% 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 35m

Direct flights

None
The fastest flight from Philadelphia to Ontario takes 7h 35m
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 35m, 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 $130Free CancellationRating
5.7
3,056 reviews
Search Frontier flights
DeltaPriceFrom $208Free CancellationRating
7.9
8,076 reviews
Search Delta flights
United AirlinesPriceFrom $305Free CancellationRating
7.4
9,180 reviews
Search United Airlines flights
American AirlinesPriceFrom $306Free CancellationRating
7.2
11,164 reviews
Search American Airlines flights
SouthwestPriceFrom $367Free CancellationRating
8.0
4,267 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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