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Cheap flights from Philadelphia to Los Angeles from $93

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 9/27. 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 (PHL-ONT)

Cheap round-trip flights

Frontier Logo
6:45 am - 7:23 amPHL-ONT
27h 38m1 stop
Frontier Logo
8:59 pm - 12:57 amONT-PHL
24h 58m1 stop
$164Frontier
Find Deal
Sat, Sep 13 - Wed, Sep 17
Frontier Logo
6:45 am - 7:54 pmPHL-ONT
16h 09m1 stop
Frontier Logo
8:59 pm - 12:57 amONT-PHL
24h 58m1 stop
$165Frontier
Find Deal
Fri, Sep 12 - Wed, Sep 17
Frontier Logo
8:10 am - 3:24 pmPHL-ONT
10h 14m1 stop
Frontier Logo
8:59 pm - 12:57 amONT-PHL
24h 58m1 stop
$166Frontier
Find Deal
Sun, Sep 21 - Wed, Sep 24
Frontier Logo
6:45 am - 7:54 pmPHL-ONT
16h 09m1 stop
Frontier Logo
8:59 pm - 12:57 amONT-PHL
24h 58m1 stop
$179Frontier
Find Deal
Mon, Sep 8 - Thu, Sep 11
Logo
7:22 am - 2:12 pmPHL-ONT
9h 50m1 stop
Logo
8:59 pm - 11:43 pmONT-PHL
23h 44m1 stop
$263
Find Deal
Tue, Sep 16 - Tue, Sep 23
Logo
6:19 am - 11:10 amPHL-ONT
7h 51m1 stop
Logo
4:11 pm - 5:42 amONT-PHL
10h 31m1 stop
$279
Find Deal
Fri, Oct 31 - Tue, Nov 4
Delta Logo
6:50 pm - 11:39 pmPHL-ONT
7h 49m1 stop
Delta Logo
9:50 am - 12:52 amONT-PHL
12h 02m2 stops
$302Delta
Find Deal
Mon, Oct 13 - Wed, Oct 22
American Airlines Logo
6:20 am - 11:57 amPHL-ONT
8h 37m1 stop
American Airlines Logo
12:46 pm - 10:42 pmONT-PHL
6h 56m1 stop
$307American Airlines
Find Deal
Sat, Nov 1 - Sat, Nov 8
Southwest Logo
6:20 am - 3:00 pmPHL-ONT
11h 40m2 stops
Southwest Logo
10:50 am - 8:35 pmONT-PHL
6h 45m1 stop
$312Southwest
Find Deal
Sat, Dec 6 - Sat, Dec 13
Delta Logo
7:05 am - 12:14 pmPHL-ONT
8h 09m1 stop
Delta Logo
11:45 am - 10:50 pmONT-PHL
8h 05m1 stop
$317Delta
Find Deal
Tue, Nov 4 - Wed, Nov 12

Frontier flights from Philadelphia to Ontario

Our best Frontier deals on Philadelphia to Ontario flight tickets
Frontier
Sep 8
PHL6:45 amPhiladelphia
16h 09m
1 stop
ONT7:54 pmOntario
Sep 11
ONT8:59 pmOntario
24h 58m
1 stop
PHL12:57 amPhiladelphia
$164
Find similar
Frontier
Sep 12
PHL6:45 amPhiladelphia
16h 09m
1 stop
ONT7:54 pmOntario
Sep 17
ONT8:59 pmOntario
24h 58m
1 stop
PHL12:57 amPhiladelphia
$165
Find similar
Frontier
Sep 21
PHL8:10 amPhiladelphia
10h 14m
1 stop
ONT3:24 pmOntario
Sep 24
ONT8:59 pmOntario
24h 58m
1 stop
PHL12:57 amPhiladelphia
$166
Find similar

Delta flights from Philadelphia to Ontario

Our best Delta deals on Philadelphia to Ontario flight tickets
Delta
Oct 13
PHL6:50 pmPhiladelphia
7h 49m
1 stop
ONT11:39 pmOntario
Oct 22
ONT9:50 amOntario
12h 02m
2 stops
PHL12:52 amPhiladelphia
$302
Find similar
Delta
Nov 4
PHL7:05 amPhiladelphia
8h 09m
1 stop
ONT12:14 pmOntario
Nov 12
ONT11:45 amOntario
8h 05m
1 stop
PHL10:50 pmPhiladelphia
$317
Find similar
Delta
Sep 9
PHL2:35 pmPhiladelphia
7h 36m
1 stop
ONT7:11 pmOntario
Sep 16
ONT11:55 amOntario
7h 17m
1 stop
PHL10:12 pmPhiladelphia
$417
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 August 28, 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

Sat 9/13

6:45 am-7:23 am

1 stop27h 38m

Ontario

Wed 9/17

8:59 pm-12:57 am

1 stop24h 58m

$164

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Fri 9/12

6:45 am-7:54 pm

1 stop16h 09m

Ontario

Wed 9/17

8:59 pm-12:57 am

1 stop24h 58m

$165

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Sun 9/21

8:10 am-3:24 pm

1 stop10h 14m

Ontario

Wed 9/24

8:59 pm-12:57 am

1 stop24h 58m

$166

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Mon 9/8

6:45 am-7:54 pm

1 stop16h 09m

Ontario

Thu 9/11

8:59 pm-12:57 am

1 stop24h 58m

$179

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Tue 9/16

7:22 am-2:12 pm

1 stop9h 50m

Ontario

Tue 9/23

8:59 pm-11:43 pm

1 stop23h 44m

$263

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Fri 10/31

6:19 am-11:10 am

1 stop7h 51m

Ontario

Tue 11/4

4:11 pm-5:42 am

1 stop10h 31m

$279

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Mon 10/13

6:50 pm-11:39 pm

1 stop7h 49m

Ontario

Wed 10/22

9:50 am-12:52 am

2 stops12h 02m

$302

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Sat 11/1

6:20 am-11:57 am

1 stop8h 37m

Ontario

Sat 11/8

12:46 pm-10:42 pm

1 stop6h 56m

$307

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Sat 12/6

6:20 am-3:00 pm

2 stops11h 40m

Ontario

Sat 12/13

10:50 am-8:35 pm

1 stop6h 45m

$312

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Tue 11/4

7:05 am-12:14 pm

1 stop8h 09m

Ontario

Wed 11/12

11:45 am-10:50 pm

1 stop8h 05m

$317

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, 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 $324. If you aren’t able to travel during the month of September, then book flights to Ontario from Philadelphia during March instead. Flights to Ontario in March, while not as cheap as those in September, still average around $342.

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 $398 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 $307 on momondo.

How have Philadelphia to Ontario flight prices changed over time?

As of August 2025, prices for Philadelphia to Ontario flights are approximately 3% 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

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 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 $130Free CancellationRating
5.8
3,204 reviews
Search Frontier flights
Spirit AirlinesPriceFrom $166Free CancellationRating
6.3
8,028 reviews
Search Spirit Airlines flights
United AirlinesPriceFrom $305Free CancellationRating
7.4
8,944 reviews
Search United Airlines flights
DeltaPriceFrom $306Free CancellationRating
7.9
7,977 reviews
Search Delta flights
American AirlinesPriceFrom $315Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights
SouthwestPriceFrom $338Free CancellationRating
8.0
4,242 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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