Latest deals
Insights
When to book
FAQs
Reviews
Price Alerts

Cheap flights from Philadelphia to Los Angeles from $110

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 8/20. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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
8:00 am - 4:22 pm-
11h 22m
Frontier Logo
3:40 pm - 6:30 am-
11h 50m
$212Frontier
Mon, Aug 31 - Thu, Sep 3
Frontier Logo
8:00 am - 3:49 pm-
10h 49m
Frontier Logo
3:40 pm - 6:30 am-
11h 50m
$212Frontier
Wed, Sep 2 - Tue, Sep 8
Multiple Airlines Logo
4:17 pm - 11:54 pm-
10h 37m
Multiple Airlines Logo
2:55 pm - 5:36 am-
11h 41m
$290Multiple Airlines
Thu, Oct 8 - Thu, Oct 15
Multiple Airlines Logo
6:00 am - 4:46 pm-
13h 46m
Multiple Airlines Logo
3:14 pm - 5:40 am-
11h 26m
$292Multiple Airlines
Tue, Sep 22 - Sat, Sep 26
American Airlines Logo
5:00 am - 9:34 am-
7h 34m
American Airlines Logo
12:37 pm - 12:22 am-
8h 45m
$311American Airlines
Thu, Sep 3 - Sat, Sep 12
Southwest Logo
12:35 pm - 7:40 pm-
10h 05m
Southwest Logo
1:45 pm - 11:55 pm-
7h 10m
$311Southwest
Thu, Oct 29 - Mon, Nov 2
Delta Logo
7:15 am - 12:10 pm-
7h 55m
Delta Logo
6:00 am - 5:38 pm-
8h 38m
$311Delta
Thu, Nov 26 - Wed, Dec 9
Delta Logo
6:48 pm - 11:58 pm-
8h 10m
Delta Logo
6:00 am - 5:38 pm-
8h 38m
$311Delta
Mon, Nov 23 - Wed, Dec 9
Southwest Logo
12:20 pm - 7:40 pm-
10h 20m
Southwest Logo
1:20 pm - 12:05 am-
7h 45m
$316Southwest
Thu, Oct 29 - Mon, Nov 2
American Airlines Logo
8:24 am - 1:25 pm-
8h 01m
American Airlines Logo
1:04 pm - 11:31 pm-
7h 27m
$329American Airlines
Fri, Sep 11 - Mon, Sep 14

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

Frontier flights from Philadelphia to Ontario

Our best Frontier deals on Philadelphia to Ontario flight tickets
Frontier
Aug 24
PHL8:00 amPhiladelphia
11h 22m
1 stop
ONT4:22 pmOntario
Aug 29
ONT3:40 pmOntario
11h 50m
1 stop
PHL6:30 amPhiladelphia
$212
Frontier
Aug 29
PHL8:00 amPhiladelphia
10h 54m
1 stop
ONT3:54 pmOntario
Sep 5
ONT3:40 pmOntario
11h 50m
1 stop
PHL6:30 amPhiladelphia
$214
Frontier
Sep 3
PHL7:00 amPhiladelphia
12h 22m
1 stop
ONT4:22 pmOntario
Sep 7
ONT10:17 pmOntario
29h 13m
1 stop
PHL6:30 amPhiladelphia
$222

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 4, 2026.
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

Cheapest round-trip

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Mon 8/31

8:00 am-4:22 pm

1 stop11h 22m

Ontario

Thu 9/3

3:40 pm-6:30 am

1 stop11h 50m

$212

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Wed 9/2

8:00 am-3:49 pm

1 stop10h 49m

Ontario

Tue 9/8

3:40 pm-6:30 am

1 stop11h 50m

$212

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Thu 10/8

4:17 pm-11:54 pm

1 stop10h 37m

Ontario

Thu 10/15

2:55 pm-5:36 am

1 stop11h 41m

$290

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Tue 9/22

6:00 am-4:46 pm

1 stop13h 46m

Ontario

Sat 9/26

3:14 pm-5:40 am

1 stop11h 26m

$292

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Thu 9/3

5:00 am-9:34 am

1 stop7h 34m

Ontario

Sat 9/12

12:37 pm-12:22 am

1 stop8h 45m

$311

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Thu 10/29

12:35 pm-7:40 pm

1 stop10h 05m

Ontario

Mon 11/2

1:45 pm-11:55 pm

1 stop7h 10m

$311

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Thu 11/26

7:15 am-12:10 pm

1 stop7h 55m

Ontario

Wed 12/9

6:00 am-5:38 pm

1 stop8h 38m

$311

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Mon 11/23

6:48 pm-11:58 pm

1 stop8h 10m

Ontario

Wed 12/9

6:00 am-5:38 pm

1 stop8h 38m

$311

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Thu 10/29

12:20 pm-7:40 pm

2 stops10h 20m

Ontario

Mon 11/2

1:20 pm-12:05 am

1 stop7h 45m

$316
Quickest round-trip

PhiladelphiaOntario

PHL - ONT

PHLONT

Philadelphia

Fri 9/11

8:24 am-1:25 pm

1 stop8h 01m

Ontario

Mon 9/14

1:04 pm-11:31 pm

1 stop7h 27m

$329

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 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 $298 to $416.
The lowest price recently found on this route was $212.

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 $358. If you aren’t able to travel during the month of September, then book flights to Ontario from Philadelphia during May instead. Flights to Ontario in May, while not as cheap as those in September, still average around $370.

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 $414 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 August 2026, prices for Philadelphia to Ontario flights are approximately 8% 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 42m

Direct flights

None
The fastest flight from Philadelphia to Ontario takes 7h 42m
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 42m, 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 $215Free CancellationRating
5.6
2,738 reviews
Search Frontier flights
DeltaPriceFrom $256Free CancellationRating
7.8
8,483 reviews
Search Delta flights
United AirlinesPriceFrom $290Free CancellationRating
7.4
10,059 reviews
Search United Airlines flights
American AirlinesPriceFrom $305Free CancellationRating
7.1
11,846 reviews
Search American Airlines flights
SouthwestPriceFrom $323Free CancellationRating
8.0
4,222 reviews
Search Southwest flights

  • United Airlines Flights From Philadelphia to Ontario

    United Airlines operates around 3 flights from Philadelphia to Ontario every week. The average price of these flights found in the last 72 hours has been $486, but momondo users have found United Airlines deals from Philadelphia to Ontario from as low as $290 round-trip. United Airlines has been scored 7.4/10 in 10,059 reviews.

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 9/3
Thu 9/10
By creating a price alert you accept our terms of use and privacy policy.

Find better results for your trip to the United States