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Cheap flights from Ontario to Philadelphia from $71

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 12/17. 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
3:20 pm - 5:31 amONT-PHL
11h 11m1 stop
Frontier Logo
6:15 am - 4:33 pmPHL-ONT
13h 18m1 stop
$134Frontier
Find Deal
Fri, Dec 5 - Mon, Dec 8
Frontier Logo
6:53 am - 4:49 amONT-PHL
18h 56m1 stop
Frontier Logo
6:00 am - 11:57 pmPHL-ONT
20h 57m1 stop
$138Frontier
Find Deal
Sun, Nov 16 - Thu, Nov 20
Frontier Logo
3:20 pm - 5:31 amONT-PHL
11h 11m1 stop
Frontier Logo
6:15 am - 4:33 pmPHL-ONT
13h 18m1 stop
$142Frontier
Find Deal
Fri, Dec 12 - Mon, Dec 15
Frontier Logo
4:05 pm - 4:49 amONT-PHL
9h 44m1 stop
Frontier Logo
7:00 am - 2:45 pmPHL-ONT
10h 45m1 stop
$146Frontier
Find Deal
Fri, Nov 14 - Sun, Nov 16
Frontier Logo
12:05 pm - 4:49 amONT-PHL
13h 44m1 stop
Frontier Logo
7:00 am - 2:45 pmPHL-ONT
10h 45m1 stop
$184Frontier
Find Deal
Thu, Nov 13 - Sun, Nov 16
Multiple Airlines Logo
8:45 am - 4:49 amONT-PHL
17h 04m1 stop
Multiple Airlines Logo
6:00 am - 2:04 pmPHL-ONT
35h 04m2 stops
$203Multiple Airlines
Find Deal
Wed, Nov 19 - Wed, Dec 3
Multiple Airlines Logo
12:30 pm - 2:21 pmONT-PHL
22h 51m1 stop
Multiple Airlines Logo
5:45 pm - 4:33 pmPHL-ONT
25h 48m2 stops
$213Multiple Airlines
Find Deal
Tue, Dec 9 - Sat, Dec 13
Alaska Airlines Logo
6:00 am - 5:53 pmONT-PHL
8h 53m1 stop
Alaska Airlines Logo
7:06 am - 6:33 pmPHL-ONT
14h 27m1 stop
$325Alaska Airlines
Find Deal
Tue, Dec 9 - Sat, Dec 13
Alaska Airlines Logo
12:13 pm - 5:46 amONT-PHL
14h 33m1 stop
Alaska Airlines Logo
7:06 am - 6:33 pmPHL-ONT
14h 27m1 stop
$334Alaska Airlines
Find Deal
Sat, Dec 6 - Sat, Dec 13
Delta Logo
6:00 am - 5:27 pmONT-PHL
8h 27m1 stop
Delta Logo
6:37 pm - 11:58 pmPHL-ONT
8h 21m1 stop
$335Delta
Find Deal
Thu, Feb 5 - Mon, Feb 9

Frontier flights from Ontario to Philadelphia

Our best Frontier deals on Ontario to Philadelphia flight tickets
Frontier
Dec 5
ONT3:20 pmOntario
11h 11m
1 stop
PHL5:31 amPhiladelphia
Dec 8
PHL6:15 amPhiladelphia
13h 18m
1 stop
ONT4:33 pmOntario
$134
Find similar
Frontier
Nov 16
ONT6:53 amOntario
18h 56m
1 stop
PHL4:49 amPhiladelphia
Nov 20
PHL6:00 amPhiladelphia
20h 57m
1 stop
ONT11:57 pmOntario
$138
Find similar
Frontier
Dec 12
ONT3:20 pmOntario
11h 11m
1 stop
PHL5:31 amPhiladelphia
Dec 15
PHL6:15 amPhiladelphia
13h 18m
1 stop
ONT4:33 pmOntario
$142
Find similar

Alaska Airlines flights from Ontario to Philadelphia

Our best Alaska Airlines deals on Ontario to Philadelphia flight tickets
Alaska Airlines
Dec 9
ONT6:00 amOntario
8h 53m
1 stop
PHL5:53 pmPhiladelphia
Dec 13
PHL7:06 amPhiladelphia
14h 27m
1 stop
ONT6:33 pmOntario
$325
Find similar
Alaska Airlines
Dec 6
ONT12:13 pmOntario
14h 33m
1 stop
PHL5:46 amPhiladelphia
Dec 13
PHL7:06 amPhiladelphia
14h 27m
1 stop
ONT6:33 pmOntario
$334
Find similar
Alaska Airlines
Nov 15
ONT4:11 pmOntario
10h 31m
1 stop
PHL5:42 amPhiladelphia
Mar 1
PHL6:35 pmPhiladelphia
19h 04m
1 stop
ONT10:39 amOntario
$704
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 November 3, 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

Fri 12/5

3:20 pm-5:31 am

1 stop11h 11m

Philadelphia

Mon 12/8

6:15 am-4:33 pm

1 stop13h 18m

$134

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

Sun 11/16

6:53 am-4:49 am

1 stop18h 56m

Philadelphia

Thu 11/20

6:00 am-11:57 pm

1 stop20h 57m

$138

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

Fri 12/12

3:20 pm-5:31 am

1 stop11h 11m

Philadelphia

Mon 12/15

6:15 am-4:33 pm

1 stop13h 18m

$142

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

Fri 11/14

4:05 pm-4:49 am

1 stop9h 44m

Philadelphia

Sun 11/16

7:00 am-2:45 pm

1 stop10h 45m

$146

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

Thu 11/13

12:05 pm-4:49 am

1 stop13h 44m

Philadelphia

Sun 11/16

7:00 am-2:45 pm

1 stop10h 45m

$184

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

Wed 11/19

8:45 am-4:49 am

1 stop17h 04m

Philadelphia

Wed 12/3

6:00 am-2:04 pm

2 stops35h 04m

$203

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

Tue 12/9

12:30 pm-2:21 pm

1 stop22h 51m

Philadelphia

Sat 12/13

5:45 pm-4:33 pm

2 stops25h 48m

$213

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

Tue 12/9

6:00 am-5:53 pm

1 stop8h 53m

Philadelphia

Sat 12/13

7:06 am-6:33 pm

1 stop14h 27m

$325

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

Sat 12/6

12:13 pm-5:46 am

1 stop14h 33m

Philadelphia

Sat 12/13

7:06 am-6:33 pm

1 stop14h 27m

$334

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

Thu 2/5

6:00 am-5:27 pm

1 stop8h 27m

Philadelphia

Mon 2/9

6:37 pm-11:58 pm

1 stop8h 21m

$335

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 September. Flight prices, which tend to average around $353, 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 $366.

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

The cheapest day to depart from Ontario to Philadelphia is on a Thursday. Travelers who choose to depart for Philadelphia on a Thursday will often find tickets for as low as $414. 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 $556.

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 $508.

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 $419 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 November 2025, prices for Ontario to Philadelphia flights are approximately 46% more expensive 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

Direct flights

None
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 6h 39m.

  • 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
8,114 reviews
Search Spirit Airlines flights
FrontierPriceFrom $151Free CancellationRating
5.8
3,117 reviews
Search Frontier flights
DeltaPriceFrom $296Free CancellationRating
7.9
8,001 reviews
Search Delta flights
American AirlinesPriceFrom $302Free CancellationRating
7.2
11,036 reviews
Search American Airlines flights
United AirlinesPriceFrom $342Free CancellationRating
7.4
8,997 reviews
Search United Airlines flights
SouthwestPriceFrom $358Free CancellationRating
8.0
4,238 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
Dewey Beach
Cherry Hill
Reading
Newark
North Wildwood
Dover
Avalon
Lewes
Stone Harbor
Vineland
Essington
Pottstown
New Castle
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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