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Cheap flights from Ontario to Philadelphia from $100

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 4/16. 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

Enter your travel dates to find the best prices.
Frontier Logo
2:08 pm - 5:55 pm
ONT
-
PHL
24h 47m
1 stop
Frontier Logo
6:00 am - 2:30 pm
PHL
-
ONT
11h 30m
1 stop
$168Frontier
Thu, Feb 26 - Mon, Mar 2
Frontier Logo
12:59 am - 5:34 am
ONT
-
PHL
25h 35m
1 stop
Frontier Logo
8:25 pm - 7:31 am
PHL
-
ONT
14h 06m
1 stop
$211Frontier
Tue, Apr 14 - Wed, Apr 22
Frontier Logo
8:40 am - 4:37 pm
ONT
-
PHL
28h 57m
1 stop
Frontier Logo
5:47 pm - 11:59 pm
PHL
-
ONT
9h 12m
1 stop
$215Frontier
Wed, Feb 25 - Sun, Mar 1
Frontier Logo
6:05 am - 4:37 pm
ONT
-
PHL
7h 32m
1 stop
Frontier Logo
8:33 pm - 11:59 pm
PHL
-
ONT
30h 26m
1 stop
$218Frontier
Thu, Mar 5 - Mon, Mar 9
Frontier Logo
6:00 am - 5:55 pm
ONT
-
PHL
8h 55m
1 stop
Frontier Logo
5:47 pm - 11:59 pm
PHL
-
ONT
9h 12m
1 stop
$219Frontier
Fri, Feb 27 - Mon, Mar 2
Frontier Logo
6:15 am - 5:31 am
ONT
-
PHL
20h 16m
1 stop
Frontier Logo
8:25 pm - 11:59 pm
PHL
-
ONT
30h 34m
1 stop
$221Frontier
Thu, Mar 19 - Mon, Mar 23
Frontier Logo
6:43 pm - 12:39 pm
ONT
-
PHL
14h 56m
2 stops
Frontier Logo
8:33 pm - 11:59 pm
PHL
-
ONT
30h 26m
1 stop
$224Frontier
Mon, Mar 2 - Mon, Mar 9
Frontier Logo
6:20 am - 5:31 am
ONT
-
PHL
20h 11m
1 stop
Frontier Logo
8:25 pm - 11:56 pm
PHL
-
ONT
30h 31m
1 stop
$230Frontier
Thu, Apr 2 - Thu, Apr 9
Frontier Logo
6:20 am - 5:30 am
ONT
-
PHL
20h 10m
1 stop
Frontier Logo
8:25 pm - 11:55 pm
PHL
-
ONT
30h 30m
1 stop
$232Frontier
Sat, Apr 11 - Mon, Apr 13
Frontier Logo
5:33 pm - 5:34 am
ONT
-
PHL
9h 01m
1 stop
Frontier Logo
8:30 am - 6:34 pm
PHL
-
ONT
13h 04m
1 stop
$242Frontier
Thu, Apr 30 - Tue, May 5

Frontier flights from Ontario to Philadelphia

Our best Frontier deals on Ontario to Philadelphia flight tickets
Frontier
Feb 26
ONT2:08 pmOntario
24h 47m
1 stop
PHL5:55 pmPhiladelphia
Mar 2
PHL6:00 amPhiladelphia
11h 30m
1 stop
ONT2:30 pmOntario
$168
Frontier
Mar 5
ONT6:05 amOntario
7h 32m
1 stop
PHL4:37 pmPhiladelphia
Mar 9
PHL8:33 pmPhiladelphia
30h 26m
1 stop
ONT11:59 pmOntario
$208
Frontier
Apr 14
ONT12:59 amOntario
25h 35m
1 stop
PHL5:34 amPhiladelphia
Apr 22
PHL8:25 pmPhiladelphia
14h 06m
1 stop
ONT7:31 amOntario
$211

Delta flights from Ontario to Philadelphia

Our best Delta deals on Ontario to Philadelphia flight tickets
Delta
Apr 7
ONT5:09 pmOntario
9h 32m
1 stop
PHL5:41 amPhiladelphia
Apr 14
PHL1:20 pmPhiladelphia
10h 40m
1 stop
ONT9:00 pmOntario
$297
Delta
May 5
ONT5:55 pmOntario
12h 00m
2 stops
PHL8:55 amPhiladelphia
May 13
PHL4:06 pmPhiladelphia
8h 48m
1 stop
ONT9:54 pmOntario
$302
Delta
May 5
ONT10:15 pmOntario
12h 46m
2 stops
PHL2:01 pmPhiladelphia
May 13
PHL12:35 pmPhiladelphia
12h 19m
2 stops
ONT9:54 pmOntario
$307

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 February 3, 2026.
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 2/26

2:08 pm-5:55 pm

1 stop24h 47m

Philadelphia

Mon 3/2

6:00 am-2:30 pm

1 stop11h 30m

$168

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

Tue 4/14

12:59 am-5:34 am

1 stop25h 35m

Philadelphia

Wed 4/22

8:25 pm-7:31 am

1 stop14h 06m

$211

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

Wed 2/25

8:40 am-4:37 pm

1 stop28h 57m

Philadelphia

Sun 3/1

5:47 pm-11:59 pm

1 stop9h 12m

$215

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

Thu 3/5

6:05 am-4:37 pm

1 stop7h 32m

Philadelphia

Mon 3/9

8:33 pm-11:59 pm

1 stop30h 26m

$218

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

Fri 2/27

6:00 am-5:55 pm

1 stop8h 55m

Philadelphia

Mon 3/2

5:47 pm-11:59 pm

1 stop9h 12m

$219

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

Thu 3/19

6:15 am-5:31 am

1 stop20h 16m

Philadelphia

Mon 3/23

8:25 pm-11:59 pm

1 stop30h 34m

$221

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

Mon 3/2

6:43 pm-12:39 pm

2 stops14h 56m

Philadelphia

Mon 3/9

8:33 pm-11:59 pm

1 stop30h 26m

$224

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

Thu 4/2

6:20 am-5:31 am

1 stop20h 11m

Philadelphia

Thu 4/9

8:25 pm-11:56 pm

1 stop30h 31m

$230

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

Sat 4/11

6:20 am-5:30 am

1 stop20h 10m

Philadelphia

Mon 4/13

8:25 pm-11:55 pm

1 stop30h 30m

$232

OntarioPhiladelphia

ONT - PHL

ONTPHL

Ontario

Thu 4/30

5:33 pm-5:34 am

1 stop9h 01m

Philadelphia

Tue 5/5

8:30 am-6:34 pm

1 stop13h 04m

$242

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 $302, 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 $342.

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 $408. 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 $554.

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 $361. 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 $510.

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 $417 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 $320 on momondo.

How have Ontario to Philadelphia flight prices changed over time?

As of February 2026, prices for Ontario to Philadelphia flights are approximately 49% 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

6h 44m

Direct flights

None
The fastest flight from Ontario to Philadelphia takes 6h 44m
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 44m.

  • 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
FrontierPriceFrom $140Free CancellationRating
5.7
3,051 reviews
Search Frontier flights
DeltaPriceFrom $296Free CancellationRating
7.9
8,138 reviews
Search Delta flights
American AirlinesPriceFrom $300Free CancellationRating
7.2
11,216 reviews
Search American Airlines flights
United AirlinesPriceFrom $342Free CancellationRating
7.4
9,236 reviews
Search United Airlines flights
SouthwestPriceFrom $356Free CancellationRating
8.0
4,272 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
Wildwood Crest
Ocean City
King of Prussia
Cherry Hill
Newark
Dewey Beach
Reading
North Wildwood
Avalon
Dover
Lewes
Stone Harbor
Essington
Vineland
New Castle
Elkton
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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