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Cheap flights from Philadelphia to Los Angeles from $91

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 2/2. 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
6:15 am - 4:33 pmPHL-ONT
13h 18m1 stop
Frontier Logo
3:20 pm - 5:31 amONT-PHL
11h 11m1 stop
$182Frontier
Find Deal
Mon, Dec 8 - Mon, Dec 15
Frontier Logo
7:10 am - 5:22 pmPHL-ONT
13h 12m1 stop
Frontier Logo
6:00 am - 11:46 amONT-PHL
26h 46m1 stop
$183Frontier
Find Deal
Thu, Jan 1 - Thu, Jan 8
Frontier Logo
10:01 pm - 7:24 amPHL-ONT
12h 23m1 stop
Frontier Logo
6:37 pm - 5:40 amONT-PHL
8h 03m1 stop
$184Frontier
Find Deal
Sat, Dec 20 - Sun, Dec 28
Frontier Logo
6:15 am - 4:33 pmPHL-ONT
13h 18m1 stop
Frontier Logo
3:20 pm - 5:31 amONT-PHL
11h 11m1 stop
$207Frontier
Find Deal
Fri, Dec 12 - Mon, Dec 15
Frontier Logo
7:10 am - 5:22 pmPHL-ONT
13h 12m1 stop
Frontier Logo
6:00 am - 5:40 amONT-PHL
20h 40m1 stop
$208Frontier
Find Deal
Thu, Dec 18 - Fri, Dec 26
Frontier Logo
7:10 am - 9:17 pmPHL-ONT
17h 07m1 stop
Frontier Logo
6:00 am - 11:46 amONT-PHL
26h 46m1 stop
$218Frontier
Find Deal
Thu, Jan 1 - Sun, Jan 11
Frontier Logo
1:05 pm - 11:56 pmPHL-ONT
13h 51m1 stop
Frontier Logo
6:00 am - 11:46 amONT-PHL
26h 46m1 stop
$220Frontier
Find Deal
Fri, Jan 9 - Sun, Jan 11
Frontier Logo
4:14 pm - 2:08 pmPHL-ONT
24h 54m1 stop
Frontier Logo
8:32 am - 1:21 amONT-PHL
13h 49m1 stop
$222Frontier
Find Deal
Thu, Jan 15 - Mon, Jan 19
Frontier Logo
10:01 pm - 7:24 amPHL-ONT
12h 23m1 stop
Frontier Logo
8:31 am - 12:28 amONT-PHL
12h 57m1 stop
$227Frontier
Find Deal
Sat, Dec 20 - Thu, Jan 8
Frontier Logo
10:01 pm - 7:24 amPHL-ONT
12h 23m1 stop
Frontier Logo
8:19 am - 1:24 amONT-PHL
14h 05m1 stop
$228Frontier
Find Deal
Sat, Dec 20 - Sun, Dec 28

Delta flights from Philadelphia to Ontario

Our best Delta deals on Philadelphia to Ontario flight tickets
Delta
Feb 9
PHL2:30 pmPhiladelphia
9h 35m
1 stop
ONT9:05 pmOntario
Feb 18
ONT1:10 pmOntario
7h 36m
1 stop
PHL11:46 pmPhiladelphia
$307
Find similar
Delta
Dec 9
PHL12:37 pmPhiladelphia
10h 02m
1 stop
ONT7:39 pmOntario
Dec 16
ONT7:05 amOntario
8h 07m
1 stop
PHL6:12 pmPhiladelphia
$352
Find similar
Delta
Dec 9
PHL12:37 pmPhiladelphia
10h 02m
1 stop
ONT7:39 pmOntario
Dec 18
ONT7:05 amOntario
6h 57m
1 stop
PHL5:02 pmPhiladelphia
$369
Find similar

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
$182
Find similar
Frontier
Jan 1
PHL7:10 amPhiladelphia
13h 12m
1 stop
ONT5:22 pmOntario
Jan 8
ONT6:00 amOntario
26h 46m
1 stop
PHL11:46 amPhiladelphia
$183
Find similar
Frontier
Dec 20
PHL10:01 pmPhiladelphia
12h 23m
1 stop
ONT7:24 amOntario
Dec 28
ONT6:37 pmOntario
8h 03m
1 stop
PHL5:40 amPhiladelphia
$184
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 26, 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

$182

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Thu 1/1

7:10 am-5:22 pm

1 stop13h 12m

Ontario

Thu 1/8

6:00 am-11:46 am

1 stop26h 46m

$183

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Sat 12/20

10:01 pm-7:24 am

1 stop12h 23m

Ontario

Sun 12/28

6:37 pm-5:40 am

1 stop8h 03m

$184

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Fri 12/12

6:15 am-4:33 pm

1 stop13h 18m

Ontario

Mon 12/15

3:20 pm-5:31 am

1 stop11h 11m

$207

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Thu 12/18

7:10 am-5:22 pm

1 stop13h 12m

Ontario

Fri 12/26

6:00 am-5:40 am

1 stop20h 40m

$208

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Thu 1/1

7:10 am-9:17 pm

1 stop17h 07m

Ontario

Sun 1/11

6:00 am-11:46 am

1 stop26h 46m

$218

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Fri 1/9

1:05 pm-11:56 pm

1 stop13h 51m

Ontario

Sun 1/11

6:00 am-11:46 am

1 stop26h 46m

$220

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Thu 1/15

4:14 pm-2:08 pm

1 stop24h 54m

Ontario

Mon 1/19

8:32 am-1:21 am

1 stop13h 49m

$222

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Sat 12/20

10:01 pm-7:24 am

1 stop12h 23m

Ontario

Thu 1/8

8:31 am-12:28 am

1 stop12h 57m

$227

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Sat 12/20

10:01 pm-7:24 am

1 stop12h 23m

Ontario

Sun 12/28

8:19 am-1:24 am

1 stop14h 05m

$228

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, 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.

Can stopping save me money on Philadelphia to Ontario flights?

You could potentially save up to 59% 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 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

Fastest flight time

7h 47m

Direct flights

None
The fastest flight from Philadelphia to Ontario takes 7h 47m
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 9h 17m, 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
3,099 reviews
Search Frontier flights
Spirit AirlinesPriceFrom $166Free CancellationRating
6.3
8,158 reviews
Search Spirit Airlines flights
DeltaPriceFrom $300Free CancellationRating
7.9
7,998 reviews
Search Delta flights
United AirlinesPriceFrom $305Free CancellationRating
7.4
9,046 reviews
Search United Airlines flights
American AirlinesPriceFrom $306Free CancellationRating
7.2
11,038 reviews
Search American Airlines flights
SouthwestPriceFrom $367Free CancellationRating
8.0
4,254 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.

An easier way to manage your Ontario trip

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