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Cheap flights from Philadelphia to Los Angeles from $62

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 2/20. 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 Philadelphia to Los Angeles

Cheap round-trip flights

Enter your travel dates to find the best prices.
Frontier Logo
6:15 am - 4:33 pmPHL-ONT
13h 18m1 stop
Frontier Logo
3:20 pm - 5:31 amONT-PHL
11h 11m1 stop
$130Frontier
Find Deal
Mon, Dec 8 - Mon, Dec 15
Frontier Logo
6:15 am - 4:33 pmPHL-ONT
13h 18m1 stop
Frontier Logo
6:15 am - 5:40 amONT-PHL
20h 25m1 stop
$131Frontier
Find Deal
Mon, Dec 15 - Wed, Dec 17
Frontier Logo
6:15 am - 4:33 pmPHL-ONT
13h 18m1 stop
Frontier Logo
4:01 pm - 5:31 amONT-PHL
10h 30m1 stop
$134Frontier
Find Deal
Mon, Dec 8 - Sun, Dec 14
Frontier Logo
6:15 am - 4:33 pmPHL-ONT
13h 18m1 stop
Frontier Logo
6:17 pm - 5:40 amONT-PHL
8h 23m1 stop
$137Frontier
Find Deal
Mon, Dec 8 - Tue, Dec 23
Frontier Logo
8:36 pm - 2:25 pmPHL-ONT
20h 49m1 stop
Frontier Logo
2:59 pm - 2:39 pmONT-PHL
20h 40m1 stop
$138Frontier
Find Deal
Sun, Dec 7 - Sun, Dec 14
Frontier Logo
1:05 pm - 11:56 pmPHL-ONT
13h 51m1 stop
Frontier Logo
6:00 am - 11:55 amONT-PHL
26h 55m1 stop
$140Frontier
Find Deal
Fri, Jan 9 - Sun, Jan 11
Frontier Logo
8:36 pm - 2:25 pmPHL-ONT
20h 49m1 stop
Frontier Logo
6:00 am - 5:40 amONT-PHL
20h 40m1 stop
$141Frontier
Find Deal
Fri, Dec 12 - Fri, Dec 19
Frontier Logo
7:10 am - 5:22 pmPHL-ONT
13h 12m1 stop
Frontier Logo
6:07 pm - 5:40 amONT-PHL
8h 33m1 stop
$144Frontier
Find Deal
Thu, Dec 18 - Thu, Dec 25
Frontier Logo
6:00 am - 11:11 amPHL-ONT
8h 11m1 stop
Frontier Logo
3:20 pm - 5:31 amONT-PHL
11h 11m1 stop
$145Frontier
Find Deal
Thu, Nov 27 - Fri, Dec 5
Frontier Logo
7:10 am - 5:42 pmPHL-ONT
13h 32m1 stop
Frontier Logo
6:56 pm - 11:33 amONT-PHL
13h 37m1 stop
$146Frontier
Find Deal
Sun, Jan 4 - Thu, Jan 8

Frontier flights from Philadelphia to Ontario

Our best Frontier deals on Philadelphia to Ontario flight tickets
Frontier
Dec 8
PHL6:15 amPhiladelphia
13h 18m
1 stop
ONT4:33 pmOntario
Dec 15
ONT3:20 pmOntario
11h 11m
1 stop
PHL5:31 amPhiladelphia
$130
Find similar
Frontier
Dec 15
PHL6:15 amPhiladelphia
13h 18m
1 stop
ONT4:33 pmOntario
Dec 17
ONT6:15 amOntario
20h 25m
1 stop
PHL5:40 amPhiladelphia
$131
Find similar
Frontier
Dec 8
PHL6:15 amPhiladelphia
13h 18m
1 stop
ONT4:33 pmOntario
Dec 14
ONT4:01 pmOntario
10h 30m
1 stop
PHL5:31 amPhiladelphia
$134
Find similar

Delta flights from Philadelphia to Ontario

Our best Delta deals on Philadelphia to Ontario flight tickets
Delta
Dec 9
PHL6:07 pmPhiladelphia
7h 57m
1 stop
ONT11:04 pmOntario
Dec 17
ONT6:00 amOntario
8h 40m
1 stop
PHL5:40 pmPhiladelphia
$317
Find similar
Delta
Nov 27
PHL6:00 amPhiladelphia
7h 52m
1 stop
ONT10:52 amOntario
Dec 4
ONT12:12 pmOntario
7h 35m
1 stop
PHL10:47 pmPhiladelphia
$327
Find similar
Delta
Nov 27
PHL10:25 amPhiladelphia
10h 39m
2 stops
ONT6:04 pmOntario
Dec 6
ONT6:00 amOntario
8h 40m
1 stop
PHL5:40 pmPhiladelphia
$332
Find similar

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 November 13, 2025.
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

Mon 12/8

6:15 am-4:33 pm

1 stop13h 18m

Ontario

Mon 12/15

3:20 pm-5:31 am

1 stop11h 11m

$130

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Mon 12/15

6:15 am-4:33 pm

1 stop13h 18m

Ontario

Wed 12/17

6:15 am-5:40 am

1 stop20h 25m

$131

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Mon 12/8

6:15 am-4:33 pm

1 stop13h 18m

Ontario

Sun 12/14

4:01 pm-5:31 am

1 stop10h 30m

$134

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Mon 12/8

6:15 am-4:33 pm

1 stop13h 18m

Ontario

Tue 12/23

6:17 pm-5:40 am

1 stop8h 23m

$137

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Sun 12/7

8:36 pm-2:25 pm

1 stop20h 49m

Ontario

Sun 12/14

2:59 pm-2:39 pm

1 stop20h 40m

$138

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Fri 1/9

1:05 pm-11:56 pm

1 stop13h 51m

Ontario

Sun 1/11

6:00 am-11:55 am

1 stop26h 55m

$140

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Fri 12/12

8:36 pm-2:25 pm

1 stop20h 49m

Ontario

Fri 12/19

6:00 am-5:40 am

1 stop20h 40m

$141

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Thu 12/18

7:10 am-5:22 pm

1 stop13h 12m

Ontario

Thu 12/25

6:07 pm-5:40 am

1 stop8h 33m

$144

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Thu 11/27

6:00 am-11:11 am

1 stop8h 11m

Ontario

Fri 12/5

3:20 pm-5:31 am

1 stop11h 11m

$145

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Sun 1/4

7:10 am-5:42 pm

1 stop13h 32m

Ontario

Thu 1/8

6:56 pm-11:33 am

1 stop13h 37m

$146

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 cheapest month to fly to Ontario?

In general, March 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 $342. If you aren’t able to travel during the month of March, then book flights to Ontario from Philadelphia during May instead. Flights to Ontario in May, while not as cheap as those in March, still average around $355.

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 Monday when prices can be found for as low as $330. This is often the case because there is less demand to fly during this day of the week. When flying out on a Saturday, the most expensive travel day of the week, you can expect to see flight prices from Philadelphia to Ontario for around $416.

What is the cheapest time of day to depart on your flight to Ontario?

In the evening is the cheapest time of day to fly from Philadelphia to Ontario when you can find flight prices for as low as $293. Flying to Ontario in the evening 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 afternoon when prices are $386 on average. Flights to Ontario from Philadelphia in the afternoon are generally more expensive because this time of day is more convenient for travelers’ schedules.

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 $413 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 $263 on momondo.

How have Philadelphia to Ontario flight prices changed over time?

As of November 2025, prices for Philadelphia to Ontario flights are approximately 12% 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

Direct flights

None
There are no direct flights from Philadelphia to Ontario. There are no popular flight routes from Philadelphia to Ontario.
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  • How far is Philadelphia to Ontario by plane?

    Ontario is 2355.5 mi away from Philadelphia. Flights usually cover this in 7h 57m, 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
5.8
3,114 reviews
Search Frontier flights
Spirit AirlinesPriceFrom $166Free CancellationRating
6.3
8,139 reviews
Search Spirit Airlines flights
United AirlinesPriceFrom $305Free CancellationRating
7.4
9,015 reviews
Search United Airlines flights
DeltaPriceFrom $306Free CancellationRating
7.9
8,007 reviews
Search Delta flights
American AirlinesPriceFrom $307Free CancellationRating
7.2
11,050 reviews
Search American Airlines flights
SouthwestPriceFrom $367Free CancellationRating
8.0
4,236 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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