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Cheap flights from Ontario to Philadelphia from $90

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 2/10. 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

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Find the cheapest flights from Ontario to Philadelphia

Cheap round-trip flights

Enter your travel dates to find the best prices.
Frontier Logo
6:00 am - 11:46 am
ONT
-
PHL
26h 46m1 stop
Frontier Logo
1:05 pm - 11:56 pm
PHL
-
ONT
13h 51m1 stop
$182Frontier
Thu, Jan 8 - Mon, Jan 12
Frontier Logo
6:00 am - 11:46 am
ONT
-
PHL
26h 46m1 stop
Frontier Logo
1:05 pm - 11:56 pm
PHL
-
ONT
13h 51m1 stop
$183Frontier
Thu, Jan 8 - Mon, Jan 12
Frontier Logo
8:31 am - 12:28 am
ONT
-
PHL
12h 57m1 stop
Frontier Logo
5:42 pm - 11:59 pm
PHL
-
ONT
9h 17m1 stop
$201Frontier
Thu, Jan 8 - Mon, Jan 19
Frontier Logo
6:05 am - 4:37 pm
ONT
-
PHL
7h 32m1 stop
Frontier Logo
5:47 pm - 11:59 pm
PHL
-
ONT
9h 12m1 stop
$203Frontier
Thu, Feb 26 - Mon, Mar 2
Frontier Logo
8:31 am - 12:28 am
ONT
-
PHL
12h 57m1 stop
Frontier Logo
1:05 pm - 11:56 pm
PHL
-
ONT
13h 51m1 stop
$217Frontier
Fri, Jan 9 - Mon, Jan 12
Frontier Logo
7:15 am - 12:52 am
ONT
-
PHL
38h 37m2 stops
Frontier Logo
8:30 am - 2:27 pm
PHL
-
ONT
8h 57m1 stop
$229Frontier
Tue, Jan 20 - Mon, Jan 26
Frontier Logo
8:31 am - 12:28 am
ONT
-
PHL
12h 57m1 stop
Frontier Logo
1:05 pm - 11:56 pm
PHL
-
ONT
13h 51m1 stop
$233Frontier
Thu, Jan 8 - Mon, Jan 12
Frontier Logo
8:19 am - 1:24 am
ONT
-
PHL
14h 05m1 stop
Frontier Logo
7:10 am - 11:21 pm
PHL
-
ONT
19h 11m1 stop
$234Frontier
Tue, Dec 30 - Sat, Jan 3
Frontier Logo
6:45 am - 5:31 am
ONT
-
PHL
19h 46m1 stop
Frontier Logo
12:51 pm - 11:56 pm
PHL
-
ONT
14h 05m1 stop
$243Frontier
Thu, Jan 1 - Fri, Jan 9
Frontier Logo
6:00 pm - 5:40 am
ONT
-
PHL
8h 40m1 stop
Frontier Logo
5:42 pm - 11:59 pm
PHL
-
ONT
9h 17m1 stop
$252Frontier
Mon, Jan 5 - Mon, Jan 19

Frontier flights from Ontario to Philadelphia

Our best Frontier deals on Ontario to Philadelphia flight tickets
Frontier
Jan 8
ONT6:00 amOntario
26h 46m
1 stop
PHL11:46 amPhiladelphia
Jan 12
PHL1:05 pmPhiladelphia
13h 51m
1 stop
ONT11:56 pmOntario
$182
Find similar
Frontier
Jan 8
ONT6:00 amOntario
26h 46m
1 stop
PHL11:46 amPhiladelphia
Jan 12
PHL1:05 pmPhiladelphia
13h 51m
1 stop
ONT11:56 pmOntario
$183
Find similar
Frontier
Jan 8
ONT8:31 amOntario
12h 57m
1 stop
PHL12:28 amPhiladelphia
Jan 19
PHL5:42 pmPhiladelphia
9h 17m
1 stop
ONT11:59 pmOntario
$201
Find similar

Delta flights from Ontario to Philadelphia

Our best Delta deals on Ontario to Philadelphia flight tickets
Delta
Jan 6
ONT1:11 pmOntario
7h 03m
1 stop
PHL11:14 pmPhiladelphia
Jan 20
PHL5:40 amPhiladelphia
8h 51m
1 stop
ONT11:31 amOntario
$316
Find similar
Delta
Dec 31
ONT11:15 amOntario
8h 35m
1 stop
PHL10:50 pmPhiladelphia
Jan 8
PHL5:40 amPhiladelphia
8h 51m
1 stop
ONT11:31 amOntario
$319
Find similar
Delta
Dec 31
ONT11:15 amOntario
8h 35m
1 stop
PHL10:50 pmPhiladelphia
Jan 8
PHL7:00 amPhiladelphia
12h 12m
2 stops
ONT4:12 pmOntario
$324
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 December 18, 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

Thu 1/8

6:00 am-11:46 am

1 stop26h 46m

Philadelphia

Mon 1/12

1:05 pm-11:56 pm

1 stop13h 51m

$182

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

Thu 1/8

6:00 am-11:46 am

1 stop26h 46m

Philadelphia

Mon 1/12

1:05 pm-11:56 pm

1 stop13h 51m

$183

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

Thu 1/8

8:31 am-12:28 am

1 stop12h 57m

Philadelphia

Mon 1/19

5:42 pm-11:59 pm

1 stop9h 17m

$201

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

Thu 2/26

6:05 am-4:37 pm

1 stop7h 32m

Philadelphia

Mon 3/2

5:47 pm-11:59 pm

1 stop9h 12m

$203

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

Fri 1/9

8:31 am-12:28 am

1 stop12h 57m

Philadelphia

Mon 1/12

1:05 pm-11:56 pm

1 stop13h 51m

$217

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

Tue 1/20

7:15 am-12:52 am

2 stops38h 37m

Philadelphia

Mon 1/26

8:30 am-2:27 pm

1 stop8h 57m

$229

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

Thu 1/8

8:31 am-12:28 am

1 stop12h 57m

Philadelphia

Mon 1/12

1:05 pm-11:56 pm

1 stop13h 51m

$233

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

Tue 12/30

8:19 am-1:24 am

1 stop14h 05m

Philadelphia

Sat 1/3

7:10 am-11:21 pm

1 stop19h 11m

$234

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

Thu 1/1

6:45 am-5:31 am

1 stop19h 46m

Philadelphia

Fri 1/9

12:51 pm-11:56 pm

1 stop14h 05m

$243

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

Mon 1/5

6:00 pm-5:40 am

1 stop8h 40m

Philadelphia

Mon 1/19

5:42 pm-11:59 pm

1 stop9h 17m

$252

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 February. Flight prices, which tend to average around $306, are often lower during this time because this is during the off-season. The month of May is another great option to travel to Philadelphia, with average flight prices from Ontario averaging around $353.

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 $411. 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 $535.

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 $364. 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 $514.

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 $408 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 $325 on momondo.

How have Ontario to Philadelphia flight prices changed over time?

As of December 2025, prices for Ontario to Philadelphia flights are approximately 42% 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

Fastest flight time

7h 32m

Direct flights

None
The fastest flight from Ontario to Philadelphia takes 7h 32m
There are no direct flights from Ontario to Philadelphia. There are no popular flight routes from Ontario to Philadelphia.
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 7h 32m.

  • 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
8,190 reviews
Search Spirit Airlines flights
FrontierPriceFrom $140Free CancellationRating
5.8
3,081 reviews
Search Frontier flights
DeltaPriceFrom $296Free CancellationRating
7.9
8,008 reviews
Search Delta flights
American AirlinesPriceFrom $300Free CancellationRating
7.2
11,055 reviews
Search American Airlines flights
United AirlinesPriceFrom $342Free CancellationRating
7.4
9,093 reviews
Search United Airlines flights
SouthwestPriceFrom $358Free CancellationRating
7.9
4,250 reviews
Search Southwest flights

Traveling to a place near Philadelphia?

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

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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