Latest deals
Insights
When to book
FAQs
Reviews
Price Alerts

Cheap flights from Philadelphia to Los Angeles from $88

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 1/7. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
0 bags

Discover deals from 900+ travel sites with momondo.

Save money when you book flights with momondo

Big names and deals

Big names and deals

Search 100s of travel sites to compare prices.

Filter for what you want

Filter for what you want

Free Wi-Fi? Stopover? Instantly customize your results.

Trusted and free

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Price Alerts

Not ready to book? to track prices.
Search flight deals

Find the cheapest flights from Philadelphia to Los Angeles

Cheap round-trip flights

Enter your travel dates to find the best prices.
Frontier Logo
8:30 am - 2:27 pm
PHL
-
ONT
8h 57m1 stop
Frontier Logo
6:05 am - 4:37 pm
ONT
-
PHL
7h 32m1 stop
$203Frontier
Mon, Feb 2 - Thu, Feb 19
Frontier Logo
5:42 pm - 11:59 pm
PHL
-
ONT
9h 17m1 stop
Frontier Logo
6:05 am - 4:37 pm
ONT
-
PHL
7h 32m1 stop
$204Frontier
Thu, Feb 19 - Thu, Feb 26
Frontier Logo
7:10 am - 9:17 pm
PHL
-
ONT
17h 07m1 stop
Frontier Logo
8:31 am - 12:28 am
ONT
-
PHL
12h 57m1 stop
$208Frontier
Thu, Jan 1 - Thu, Jan 8
Frontier Logo
12:51 pm - 11:56 pm
PHL
-
ONT
14h 05m1 stop
Frontier Logo
8:31 am - 12:28 am
ONT
-
PHL
12h 57m1 stop
$217Frontier
Fri, Jan 9 - Mon, Jan 12
Frontier Logo
7:10 am - 11:21 pm
PHL
-
ONT
19h 11m1 stop
Frontier Logo
8:31 am - 12:36 am
ONT
-
PHL
13h 05m1 stop
$218Frontier
Sat, Jan 3 - Sun, Jan 11
Frontier Logo
4:14 pm - 1:52 pm
PHL
-
ONT
24h 38m2 stops
Frontier Logo
7:30 am - 4:37 pm
ONT
-
PHL
30h 07m1 stop
$223Frontier
Tue, Feb 24 - Wed, Mar 4
Frontier Logo
7:10 am - 11:21 pm
PHL
-
ONT
19h 11m1 stop
Frontier Logo
8:31 am - 12:28 am
ONT
-
PHL
12h 57m1 stop
$227Frontier
Sat, Jan 3 - Mon, Jan 12
Frontier Logo
7:10 am - 9:17 pm
PHL
-
ONT
17h 07m1 stop
Frontier Logo
8:31 am - 12:28 am
ONT
-
PHL
12h 57m1 stop
$229Frontier
Thu, Jan 1 - Thu, Jan 8
Frontier Logo
8:30 am - 2:27 pm
PHL
-
ONT
8h 57m1 stop
Frontier Logo
6:10 am - 4:37 pm
ONT
-
PHL
7h 27m1 stop
$233Frontier
Mon, Feb 2 - Mon, Feb 23
Frontier Logo
6:00 am - 4:26 pm
PHL
-
ONT
13h 26m1 stop
Frontier Logo
6:05 am - 4:37 pm
ONT
-
PHL
7h 32m1 stop
$238Frontier
Sun, Feb 1 - Thu, Feb 19

Frontier flights from Philadelphia to Ontario

Our best Frontier deals on Philadelphia to Ontario flight tickets
Frontier
Feb 2
PHL8:30 amPhiladelphia
8h 57m
1 stop
ONT2:27 pmOntario
Feb 19
ONT6:05 amOntario
7h 32m
1 stop
PHL4:37 pmPhiladelphia
$203
Find similar
Frontier
Feb 19
PHL5:42 pmPhiladelphia
9h 17m
1 stop
ONT11:59 pmOntario
Feb 26
ONT6:05 amOntario
7h 32m
1 stop
PHL4:37 pmPhiladelphia
$204
Find similar
Frontier
Jan 1
PHL7:10 amPhiladelphia
17h 07m
1 stop
ONT9:17 pmOntario
Jan 8
ONT8:31 amOntario
12h 57m
1 stop
PHL12:28 amPhiladelphia
$208
Find similar

Delta flights from Philadelphia to Ontario

Our best Delta deals on Philadelphia to Ontario flight tickets
Delta
Jan 17
PHL5:40 amPhiladelphia
8h 51m
1 stop
ONT11:31 amOntario
Jan 24
ONT12:41 pmOntario
8h 40m
1 stop
PHL12:21 amPhiladelphia
$335
Find similar
Delta
Feb 3
PHL5:40 amPhiladelphia
8h 51m
1 stop
ONT11:31 amOntario
Feb 23
ONT10:20 pmOntario
8h 07m
1 stop
PHL9:27 amPhiladelphia
$351
Find similar
Delta
Feb 24
PHL6:00 amPhiladelphia
10h 54m
2 stops
ONT1:54 pmOntario
Mar 4
ONT7:30 amOntario
13h 14m
2 stops
PHL11:44 pmPhiladelphia
$356
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 December 16, 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 2/2

8:30 am-2:27 pm

1 stop8h 57m

Ontario

Thu 2/19

6:05 am-4:37 pm

1 stop7h 32m

$203

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Thu 2/19

5:42 pm-11:59 pm

1 stop9h 17m

Ontario

Thu 2/26

6:05 am-4:37 pm

1 stop7h 32m

$204

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Thu 1/1

7:10 am-9:17 pm

1 stop17h 07m

Ontario

Thu 1/8

8:31 am-12:28 am

1 stop12h 57m

$208

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Fri 1/9

12:51 pm-11:56 pm

1 stop14h 05m

Ontario

Mon 1/12

8:31 am-12:28 am

1 stop12h 57m

$217

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Sat 1/3

7:10 am-11:21 pm

1 stop19h 11m

Ontario

Sun 1/11

8:31 am-12:36 am

1 stop13h 05m

$218

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Tue 2/24

4:14 pm-1:52 pm

2 stops24h 38m

Ontario

Wed 3/4

7:30 am-4:37 pm

1 stop30h 07m

$223

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Sat 1/3

7:10 am-11:21 pm

1 stop19h 11m

Ontario

Mon 1/12

8:31 am-12:28 am

1 stop12h 57m

$227

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Thu 1/1

7:10 am-9:17 pm

1 stop17h 07m

Ontario

Thu 1/8

8:31 am-12:28 am

1 stop12h 57m

$229

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Mon 2/2

8:30 am-2:27 pm

1 stop8h 57m

Ontario

Mon 2/23

6:10 am-4:37 pm

1 stop7h 27m

$233

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Sun 2/1

6:00 am-4:26 pm

1 stop13h 26m

Ontario

Thu 2/19

6:05 am-4:37 pm

1 stop7h 32m

$238

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
1
2

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, 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 $354. 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 $412 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 $229 on momondo.

Can stopping save me money on Philadelphia to Ontario flights?

You could potentially save up to 35% 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 December 2025, prices for Philadelphia to Ontario flights are approximately 13% 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 38m

Direct flights

None
The fastest flight from Philadelphia to Ontario takes 7h 38m
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 38m, 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
3,082 reviews
Search Frontier flights
Spirit AirlinesPriceFrom $166Free CancellationRating
6.3
8,188 reviews
Search Spirit Airlines flights
DeltaPriceFrom $300Free CancellationRating
7.9
8,010 reviews
Search Delta flights
United AirlinesPriceFrom $305Free CancellationRating
7.4
9,094 reviews
Search United Airlines flights
American AirlinesPriceFrom $306Free CancellationRating
7.2
11,047 reviews
Search American Airlines flights
SouthwestPriceFrom $367Free CancellationRating
7.9
4,250 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

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.
Start using Trips
Find my bookings

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.
1 adult
Thu 1/15
Thu 1/22
By creating a price alert you accept our terms of use and privacy policy.

Find better results for your trip to the United States