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Cheap flights from Ontario to Philadelphia from $104

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Ontario to Philadelphia departing on 9/3. 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 Ontario to Philadelphia

Cheap round-trip flights

Frontier Logo
12:59 am - 5:09 amONT-PHL
25h 10m1 stop
Frontier Logo
6:45 am - 7:23 amPHL-ONT
27h 38m1 stop
$258Frontier
Find Deal
Tue, Aug 12 - Sat, Oct 4
Frontier Logo
12:59 am - 4:54 amONT-PHL
24h 55m1 stop
Frontier Logo
8:00 am - 4:11 pmPHL-ONT
11h 11m1 stop
$259Frontier
Find Deal
Tue, Aug 19 - Sat, Aug 30
Frontier Logo
8:59 pm - 11:43 pmONT-PHL
23h 44m1 stop
Frontier Logo
6:45 am - 7:54 pmPHL-ONT
16h 09m1 stop
$265Frontier
Find Deal
Tue, Sep 30 - Sat, Oct 4
United Airlines Logo
6:36 pm - 5:26 amONT-PHL
7h 50m1 stop
United Airlines Logo
5:06 pm - 10:30 pmPHL-ONT
8h 24m1 stop
$320United Airlines
Find Deal
Wed, Oct 1 - Tue, Oct 7
Delta Logo
7:05 am - 5:36 pmONT-PHL
7h 31m1 stop
Delta Logo
5:25 am - 10:20 amPHL-ONT
7h 55m1 stop
$322Delta
Find Deal
Sat, Aug 23 - Sat, Aug 30
Delta Logo
7:05 am - 7:54 pmONT-PHL
9h 49m1 stop
Delta Logo
5:25 am - 10:35 amPHL-ONT
8h 10m1 stop
$324Delta
Find Deal
Sat, Aug 30 - Sat, Sep 6
American Airlines Logo
12:22 pm - 11:23 pmONT-PHL
8h 01m1 stop
American Airlines Logo
6:42 am - 11:55 amPHL-ONT
8h 13m1 stop
$325American Airlines
Find Deal
Wed, Aug 27 - Wed, Sep 3
American Airlines Logo
12:45 pm - 12:50 amONT-PHL
9h 05m1 stop
American Airlines Logo
3:40 pm - 9:24 pmPHL-ONT
8h 44m1 stop
$331American Airlines
Find Deal
Thu, Sep 18 - Tue, Sep 23
United Airlines Logo
5:10 am - 5:21 pmONT-PHL
9h 11m2 stops
United Airlines Logo
3:00 pm - 10:30 pmPHL-ONT
10h 30m2 stops
$386United Airlines
Find Deal
Sat, Sep 13 - Mon, Sep 15
Southwest Logo
5:45 am - 5:40 pmONT-PHL
8h 55m2 stops
Southwest Logo
7:10 am - 12:40 pmPHL-ONT
8h 30m2 stops
$387Southwest
Find Deal
Wed, Sep 17 - Mon, Sep 22

Frontier flights from Ontario to Philadelphia

Our best Frontier deals on Ontario to Philadelphia flight tickets
Frontier
Aug 12
ONT12:59 amOntario
25h 10m
1 stop
PHL5:09 amPhiladelphia
Oct 4
PHL6:45 amPhiladelphia
27h 38m
1 stop
ONT7:23 amOntario
$258
Find similar
Frontier
Aug 19
ONT12:59 amOntario
24h 55m
1 stop
PHL4:54 amPhiladelphia
Aug 30
PHL8:00 amPhiladelphia
11h 11m
1 stop
ONT4:11 pmOntario
$259
Find similar
Frontier
Sep 30
ONT8:59 pmOntario
23h 44m
1 stop
PHL11:43 pmPhiladelphia
Oct 4
PHL6:45 amPhiladelphia
16h 09m
1 stop
ONT7:54 pmOntario
$265
Find similar

American Airlines flights from Ontario to Philadelphia

Our best American Airlines deals on Ontario to Philadelphia flight tickets
American Airlines
Aug 27
ONT12:22 pmOntario
8h 01m
1 stop
PHL11:23 pmPhiladelphia
Sep 3
PHL6:42 amPhiladelphia
8h 13m
1 stop
ONT11:55 amOntario
$325
Find similar
American Airlines
Sep 18
ONT12:45 pmOntario
9h 05m
1 stop
PHL12:50 amPhiladelphia
Sep 23
PHL3:40 pmPhiladelphia
8h 44m
1 stop
ONT9:24 pmOntario
$331
Find similar
American Airlines
Aug 28
ONT6:17 amOntario
7h 06m
1 stop
PHL4:23 pmPhiladelphia
Sep 1
PHL6:38 amPhiladelphia
8h 14m
1 stop
ONT11:52 amOntario
$337
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from Ontario to Philadelphia 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 July 31, 2025.
Use the filters below to find and compare flights from Ontario to Philadelphia that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

Tue 8/12

12:59 am-5:09 am

1 stop25h 10m

Philadelphia

Sat 10/4

6:45 am-7:23 am

1 stop27h 38m

$258

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

Tue 8/19

12:59 am-4:54 am

1 stop24h 55m

Philadelphia

Sat 8/30

8:00 am-4:11 pm

1 stop11h 11m

$259

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

Tue 9/30

8:59 pm-11:43 pm

1 stop23h 44m

Philadelphia

Sat 10/4

6:45 am-7:54 pm

1 stop16h 09m

$265

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

Wed 10/1

6:36 pm-5:26 am

1 stop7h 50m

Philadelphia

Tue 10/7

5:06 pm-10:30 pm

1 stop8h 24m

$320

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

Sat 8/23

7:05 am-5:36 pm

1 stop7h 31m

Philadelphia

Sat 8/30

5:25 am-10:20 am

1 stop7h 55m

$322

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

Sat 8/30

7:05 am-7:54 pm

1 stop9h 49m

Philadelphia

Sat 9/6

5:25 am-10:35 am

1 stop8h 10m

$324

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

Wed 8/27

12:22 pm-11:23 pm

1 stop8h 01m

Philadelphia

Wed 9/3

6:42 am-11:55 am

1 stop8h 13m

$325

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

Thu 9/18

12:45 pm-12:50 am

1 stop9h 05m

Philadelphia

Tue 9/23

3:40 pm-9:24 pm

1 stop8h 44m

$331

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

Sat 9/13

5:10 am-5:21 pm

2 stops9h 11m

Philadelphia

Mon 9/15

3:00 pm-10:30 pm

2 stops10h 30m

$386

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

Wed 9/17

5:45 am-5:40 pm

2 stops8h 55m

Philadelphia

Mon 9/22

7:10 am-12:40 pm

2 stops8h 30m

$387

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 Philadelphia from

How to get the cheapest flight ticket from Ontario to Philadelphia

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 Philadelphia?

The cheapest month to fly to Philadelphia from Ontario is in August. Flight prices, which tend to average around $356, are often lower during this time because this is during the off-season. The month of September is another great option to travel to Philadelphia, with average flight prices from Ontario averaging around $356.

What is the cheapest day to depart on your flight to Philadelphia?

The cheapest day to depart from Ontario to Philadelphia is on a Wednesday. Travelers who choose to depart for Philadelphia on a Wednesday will often find tickets for as low as $404. On the other hand, Sunday is the most expensive day to depart from Ontario because it is more convenient for both business and leisure travelers. As a result, prices tend to be around $561.

What is the cheapest time of day to depart on your flight to Philadelphia?

According to our data, the cheapest time of day to fly to Philadelphia is in the evening. momondo users have found flights departing from Ontario to Philadelphia in the evening for as low as $370. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. In contrast, the most expensive time of day to depart to Philadelphia is in the morning when prices are around $488.

How far in advance should I book a flight to Philadelphia?

You are more likely to see cheaper flights to Philadelphia from Ontario when booking weeks ahead of your departure date. In general, you can expect to find flights to Philadelphia for around $411 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Philadelphia from Ontario for as low as $331 on momondo.

How have Ontario to Philadelphia flight prices changed over time?

As of July 2025, prices for Ontario to Philadelphia flights are approximately 21% cheaper when compared to flights at the same time last year.

When to book flights from Ontario to Philadelphia

Are you open to changing your travel dates? Check out the ideal times to fly from Ontario to Philadelphia according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap Ontario to Philadelphia (ONT to PHL) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Ontario to Philadelphia

Best Price Found

$104

Fastest flight time

6h 58m

Direct flights

None

Airports in Philadelphia

1 airport
The best one-way flight to Philadelphia from Ontario in the past 72 hours is $104. The best round-trip flight deal from Ontario to Philadelphia found on momondo in the last 72 hours is $258.
The fastest flight from Ontario to Philadelphia takes 6h 58m
There are no direct flights from Ontario to Philadelphia. Popular non-direct route for this connection is Ontario Airport - Philadelphia Airport.
There is 1 airport near Philadelphia: Philadelphia (PHL)
Search flight deals

  • How far is Ontario to Philadelphia by plane?

    The distance between Ontario and Philadelphia is about 2355.5 mi. In terms of flight time, this usually takes a little over 6h 58m.

  • When did momondo last update prices for flights from Ontario Airport to Philadelphia Airport?

    Prices for flights from Ontario Airport to Philadelphia Airport are updated daily.

  • How many operators does momondo search for flights from Ontario Airport to Philadelphia Airport?

  • How old do you have to be to fly from Ontario Airport to Philadelphia 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 Ontario Airport to Philadelphia Airport.

  • What documentation or ID do you need to fly to Philadelphia Airport?

    The travel and health documents you'll need for your trip to Philadelphia Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Philadelphia Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

  • What is the most popular airline from Ontario to Philadelphia?

Best airlines flying from Ontario to Philadelphia

Compare and see reviews for airlines that fly from Ontario to Philadelphia with momondo
Airline
Rating
Free Cancellation
Price
Spirit AirlinesPriceFrom $88Free CancellationRating
6.3
8,049 reviews
Search Spirit Airlines flights
FrontierPriceFrom $140Free CancellationRating
5.9
3,239 reviews
Search Frontier flights
DeltaPriceFrom $324Free CancellationRating
8.0
7,981 reviews
Search Delta flights
American AirlinesPriceFrom $326Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights
United AirlinesPriceFrom $342Free CancellationRating
7.4
8,900 reviews
Search United Airlines flights
SouthwestPriceFrom $361Free CancellationRating
8.0
4,246 reviews
Search Southwest flights

Traveling to a place near Philadelphia?

Book flights to Philadelphia if you plan to visit one of these locations
Wildwood
Rehoboth Beach
Cape May
Ocean City
Wildwood Crest
King of Prussia
Reading
Dewey Beach
Newark
Dover
North Wildwood
Cherry Hill
Lewes
Avalon
Stone Harbor
Vineland
Exton
Essington
New Castle
Pottstown

Why use momondo?

Why should I use momondo to find a flight deal from Ontario to Philadelphia?

It is quick and easy to find Ontario to Philadelphia flights on momondo. We search and return numerous flight options from various airlines and agents. You can then use our filters to narrow your search until you have found the most convenient flight to Philadelphia that suits you.

Can I find flights from Ontario to Philadelphia with flexible booking policies on momondo?

All flight searches from Ontario to Philadelphia on momondo can be filtered to show those which offer flexible booking policies.

How can momondo help me find flights from Ontario to Philadelphia?

momondo provides multiple filters to help you find the best flight to Philadelphia from Ontario. Filter by price, airline, airports, cabin, aircraft, payment method, number of stops and more.

I’m not ready to book a flight from Ontario to Philadelphia right now. Can momondo alert me if prices change?

Yes. momondo can track prices for Ontario to Philadelphia flights and alert you when they change. Perform a search to set up the price alert. All that is required is a valid email address.

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