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Cheap flights from Philadelphia to Los Angeles from $109

1 adult
1 adult, Economy, 0 bags

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from Philadelphia to Los Angeles

Cheap round-trip flights

Enter your travel dates to find the best prices.
Frontier Logo
4:31 pm - 10:45 amPHL  Philadelphia-ONT Ontario
21h 14m2 stops Atlanta Hartsfield-Jackson Denver Intl
Frontier Logo
8:44 am - 11:40 pmONT  Ontario-PHL Philadelphia
11h 56m2 stops Las Vegas Harry Reid Intl Atlanta Hartsfield-Jackson
$247Frontier
Fri, Dec 11 - Tue, Dec 15
Frontier Logo
12:45 pm - 10:17 pmPHL  Philadelphia-ONT Ontario
12h 32m2 stops Atlanta Hartsfield-Jackson Denver Intl
Frontier Logo
6:00 am - 11:26 pmONT  Ontario-PHL Philadelphia
14h 26m2 stops Denver Intl Raleigh-Durham
$250Frontier
Sat, Dec 5 - Sat, Dec 12
Multiple Airlines Logo
7:00 am - 4:05 pmPHL  Philadelphia-ONT Ontario
12h 05m1 stop Seattle/Tacoma Intl
Multiple Airlines Logo
11:42 am - 5:21 amONT  Ontario-PHL Philadelphia
14h 39m1 stop Denver Intl
$289Multiple Airlines
Tue, Dec 15 - Mon, Dec 21
Delta Logo
12:09 pm - 7:55 pmPHL  Philadelphia-ONT Ontario
10h 46m1 stop Atlanta Hartsfield-Jackson
Delta Logo
12:20 pm - 12:52 amONT  Ontario-PHL Philadelphia
9h 32m1 stop Atlanta Hartsfield-Jackson
$321Delta
Sat, Dec 5 - Sat, Dec 12
Multiple Airlines Logo
7:00 am - 4:05 pmPHL  Philadelphia-ONT Ontario
12h 05m1 stop Seattle/Tacoma Intl
Multiple Airlines Logo
11:42 am - 5:21 amONT  Ontario-PHL Philadelphia
14h 39m1 stop Denver Intl
$321Multiple Airlines
Tue, Dec 15 - Mon, Dec 21
American Airlines Logo
6:55 am - 12:39 pmPHL  Philadelphia-ONT Ontario
8h 44m1 stop Phoenix Sky Harbor Intl
American Airlines Logo
6:20 am - 4:12 pmONT  Ontario-PHL Philadelphia
6h 52m1 stop Phoenix Sky Harbor Intl
$369American Airlines
Sat, Jan 9 - Tue, Jan 12
American Airlines Logo
6:55 am - 12:39 pmPHL  Philadelphia-ONT Ontario
8h 44m1 stop Phoenix Sky Harbor Intl
American Airlines Logo
12:45 pm - 10:37 pmONT  Ontario-PHL Philadelphia
6h 52m1 stop Dallas/Fort Worth
$369American Airlines
Thu, Jan 28 - Mon, Feb 1
Southwest Logo
11:25 am - 7:05 pmPHL  Philadelphia-ONT Ontario
10h 40m1 stop Nashville Intl
Southwest Logo
7:00 am - 4:40 pmONT  Ontario-PHL Philadelphia
6h 40m1 stop Denver Intl
$369Southwest
Sat, Feb 20 - Wed, Mar 3
Southwest Logo
5:10 am - 10:10 amPHL  Philadelphia-ONT Ontario
8h 00m1 stop Denver Intl
Southwest Logo
1:50 pm - 12:10 amONT  Ontario-PHL Philadelphia
7h 20m1 stop Denver Intl
$369Southwest
Thu, Jan 7 - Thu, Jan 7
Delta Logo
5:30 am - 11:54 amPHL  Philadelphia-ONT Ontario
9h 24m1 stop Atlanta Hartsfield-Jackson
Delta Logo
7:05 am - 5:33 pmONT  Ontario-PHL Philadelphia
7h 28m1 stop Atlanta Hartsfield-Jackson
$369Delta
Fri, Feb 19 - Tue, Mar 2

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Frontier flights from Philadelphia to Ontario

Our best Frontier deals on Philadelphia to Ontario flight tickets
Frontier
Dec 11
PHL4:31 pmPhiladelphia
21h 14m
2 stops
ONT10:45 amOntario
Dec 15
ONT8:44 amOntario
11h 56m
2 stops
PHL11:40 pmPhiladelphia
$247
Frontier
Dec 5
PHL12:45 pmPhiladelphia
12h 32m
2 stops
ONT10:17 pmOntario
Dec 12
ONT6:00 amOntario
14h 26m
2 stops
PHL11:26 pmPhiladelphia
$251
Frontier
Dec 5
PHL7:15 amPhiladelphia
18h 02m
2 stops
ONT10:17 pmOntario
Dec 12
ONT6:00 amOntario
14h 26m
2 stops
PHL11:26 pmPhiladelphia
$252

momondo Fare Finder

 
Use the filters below to find and compare flights from Philadelphia to Ontario that are best for you.

Fly from

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Route

Depart

Return

Price

Cheapest round-trip

PhiladelphiaOntario

PHL Philadelphia - ONT Ontario

PHLONT

Philadelphia

Fri 12/11

4:31 pm-10:45 am

2 stops21h 14m

Ontario

Tue 12/15

8:44 am-11:40 pm

2 stops11h 56m

$247

PhiladelphiaOntario

PHL Philadelphia - ONT Ontario

PHLONT

Philadelphia

Sat 12/5

12:45 pm-10:17 pm

2 stops12h 32m

Ontario

Sat 12/12

6:00 am-11:26 pm

2 stops14h 26m

$250

PhiladelphiaOntario

PHL Philadelphia - ONT Ontario

PHLONT

Philadelphia

Tue 12/15

7:00 am-4:05 pm

1 stop12h 05m

Ontario

Mon 12/21

11:42 am-5:21 am

1 stop14h 39m

$289

PhiladelphiaOntario

PHL Philadelphia - ONT Ontario

PHLONT

Philadelphia

Sat 12/5

12:09 pm-7:55 pm

1 stop10h 46m

Ontario

Sat 12/12

12:20 pm-12:52 am

1 stop9h 32m

$321

PhiladelphiaOntario

PHL Philadelphia - ONT Ontario

PHLONT

Philadelphia

Tue 12/15

7:00 am-4:05 pm

1 stop12h 05m

Ontario

Mon 12/21

11:42 am-5:21 am

1 stop14h 39m

$321

PhiladelphiaOntario

PHL Philadelphia - ONT Ontario

PHLONT

Philadelphia

Sat 1/9

6:55 am-12:39 pm

1 stop8h 44m

Ontario

Tue 1/12

6:20 am-4:12 pm

1 stop6h 52m

$369

PhiladelphiaOntario

PHL Philadelphia - ONT Ontario

PHLONT

Philadelphia

Thu 1/28

6:55 am-12:39 pm

1 stop8h 44m

Ontario

Mon 2/1

12:45 pm-10:37 pm

1 stop6h 52m

$369

PhiladelphiaOntario

PHL Philadelphia - ONT Ontario

PHLONT

Philadelphia

Sat 2/20

11:25 am-7:05 pm

1 stop10h 40m

Ontario

Wed 3/3

7:00 am-4:40 pm

1 stop6h 40m

$369
Quickest round-trip

PhiladelphiaOntario

PHL Philadelphia - ONT Ontario

PHLONT

Philadelphia

Thu 1/7

5:10 am-10:10 am

1 stop8h 00m

Ontario

Thu 1/7

1:50 pm-12:10 am

1 stop7h 20m

$369

PhiladelphiaOntario

PHL Philadelphia - ONT Ontario

PHLONT

Philadelphia

Fri 2/19

5:30 am-11:54 am

1 stop9h 24m

Ontario

Tue 3/2

7:05 am-5:33 pm

1 stop7h 28m

$369

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 typical price of a round-trip flight between Philadelphia and Ontario?

Prices are currently low for flights on this route.

Typical prices usually range from $328 to $610.
The lowest price recently found on this route was $247.

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 $343. If you aren’t able to travel during the month of September, then book flights to Ontario from Philadelphia during January instead. Flights to Ontario in January, while not as cheap as those in September, still average around $368.

How far in advance should I book a flight from Philadelphia 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 $407 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 $285 on momondo.

How have Philadelphia to Ontario flight prices changed over time?

As of November 2026, prices for Philadelphia to Ontario flights are approximately 6% 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

Best Price Found

$109

Fastest flight time

7h 54m

Direct flights

None
The best one-way flight to Ontario from Philadelphia in the past 72 hours is $109. The best round-trip flight deal from Philadelphia to Ontario found on momondo in the last 72 hours is $247.
The fastest flight from Philadelphia to Ontario takes 7h 54m
There are no direct flights from Philadelphia to Ontario. There are no popular flight routes from Philadelphia to Ontario.
Search flight deals

Frequently asked questions about flying from Philadelphia to Ontario

  • How far is Philadelphia to Ontario by plane?

    Ontario is 2355.5 mi away from Philadelphia. Flights usually cover this in 7h 54m, 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
DeltaPriceFrom $184Free CancellationRating
7.8
8,696 reviews
Search Delta flights
FrontierPriceFrom $219Free CancellationRating
5.5
2,513 reviews
Search Frontier flights
United AirlinesPriceFrom $290Free CancellationRating
7.3
10,460 reviews
Search United Airlines flights
American AirlinesPriceFrom $308Free CancellationRating
7.0
12,230 reviews
Search American Airlines flights
SouthwestPriceFrom $310Free CancellationRating
8.0
4,215 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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