PHL - ONT

$79 Find Cheap Flights from Philadelphia to Ontario

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Philadelphia to Ontario departing on 4/26. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy, 0 bags

KAYAK searches hundreds of travel sites at once for deals on flights to Ontario

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Philadelphia to Ontario, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Philadelphia to Ontario, as well as popular online travel agencies
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Everything you should know

Cheapest round-trip
$160
Typical prices: $488-$376
Frontier
Sat 4/25Tue 4/28
PHL - ONT • 1 stop
Cheapest one-way
$79
Typical prices: $171-$308
Frontier
Sun 4/26
PHL - ONT • 1 stop
Nonstop flights
Not available
There are currently no direct flights between Philadelphia and Ontario. You'll need at least 1 connection.
Insights
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Top layover airports
Cheapest • Avg $304 (round-trip)
Shortest trip • 7h 34m (one-way)
Insights
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When to book
in advance
Our data shows that travelers who book at least 5 weeks in advance save around 52% compared to booking last minute.
Insights
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When to travel
Cheapest • 11% price drop
Most popular
Good to know
Good to know
+1
+1
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Good to know
+1
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KAYAK searches 100s of sites at once to find you the best travel deals.
We hope you love your trip to Ontario!
Flight Deals
Booking Insights
Flight Deals

Cheap Flights from Philadelphia to Ontario (PHL-ONT)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Philadelphia to Ontario that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Philadelphia to Ontario

Sat, Apr 25 - Tue, Apr 28
Frontier Logo
8:00 am - 6:49 pm
PHL
-
ONT
13h 49m
1 stop
Frontier Logo
7:44 pm - 6:50 am
ONT
-
PHL
8h 06m
1 stop
$160Frontier
Thu, Apr 23 - Tue, Apr 28
Frontier Logo
3:41 pm - 11:55 pm
PHL
-
ONT
11h 14m
1 stop
Frontier Logo
12:59 am - 5:34 am
ONT
-
PHL
25h 35m
1 stop
$161Frontier
Thu, Apr 23 - Sat, Apr 25
Frontier Logo
8:41 pm - 7:31 am
PHL
-
ONT
13h 50m
1 stop
Frontier Logo
12:59 am - 5:34 am
ONT
-
PHL
25h 35m
1 stop
$162Frontier
Mon, Apr 20 - Tue, Apr 21
Frontier Logo
3:41 pm - 11:43 pm
PHL
-
ONT
11h 02m
1 stop
Frontier Logo
12:59 am - 5:34 am
ONT
-
PHL
25h 35m
1 stop
$167Frontier
Fri, May 8 - Sun, May 10
Frontier Logo
8:35 pm - 11:49 pm
PHL
-
ONT
30h 14m
1 stop
Frontier Logo
8:30 am - 10:14 pm
ONT
-
PHL
10h 44m
1 stop
$171Frontier
Wed, May 13 - Fri, May 15
Frontier Logo
7:00 am - 7:35 am
PHL
-
ONT
27h 35m
1 stop
Frontier Logo
8:06 pm - 3:16 pm
ONT
-
PHL
16h 10m
1 stop
$172Frontier
Tue, May 12 - Tue, May 19
Frontier Logo
8:35 pm - 10:05 am
PHL
-
ONT
16h 30m
1 stop
Frontier Logo
8:06 pm - 3:16 pm
ONT
-
PHL
16h 10m
1 stop
$176Frontier
Tue, Apr 14 - Tue, Apr 21
Frontier Logo
6:00 am - 10:44 am
PHL
-
ONT
7h 44m
1 stop
Frontier Logo
7:44 pm - 6:50 am
ONT
-
PHL
8h 06m
1 stop
$180Frontier
Wed, May 6 - Sat, May 9
Frontier Logo
10:40 am - 3:44 pm
PHL
-
ONT
8h 04m
1 stop
Frontier Logo
4:04 pm - 6:52 am
ONT
-
PHL
11h 48m
1 stop
$185Frontier
Tue, May 12 - Tue, May 19
Frontier Logo
8:35 pm - 10:05 am
PHL
-
ONT
16h 30m
1 stop
Frontier Logo
6:00 am - 5:37 am
ONT
-
PHL
20h 37m
1 stop
$186Frontier
Booking Insights

KAYAK's insights & trends for Philadelphia to Ontario flights

Get data-powered insights and trends into flights from Philadelphia to Ontario to help you find the cheapest flights, the best time to fly and much more.

How much is a round-trip flight from Philadelphia to Ontario?

This analysis is based on the cheapest round-trip price found on KAYAK in the last 12 months by searching for a flight from Philadelphia to Ontario departing in April.

What is the cheapest month to fly from Philadelphia to Ontario?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Philadelphia to Ontario, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.

The cheapest month for flights from Philadelphia to Ontario is February, where tickets cost $374 (return) on average. On the other hand, the most expensive months are December and June, where the average cost of round-trip tickets is $486 and $485 respectively.

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

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights from Philadelphia to Ontario, removes the top 0.1% to account for outliers, and then takes the average of all the values for each week.

To get a below average price on the flight from Philadelphia to Ontario, you should book around 5 weeks before departure, which saves you about 52% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 11 weeks before departure.

Good to know

Low seasonOctober
Cheapest flight$79
Best time to beat the crowds with an average 11% drop in price.
Most popular time to fly with an average 15% increase in price.
Flight from Philadelphia to Ontario

When to book flights from Philadelphia to Ontario

Are your dates flexible? Find out the best times to travel from Philadelphia to Ontario based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs for booking flights from Philadelphia to Ontario

  • What is the cheapest flight from Philadelphia to Ontario?

    In the last 3 days, the lowest price for a flight from Philadelphia to Ontario was $79 for a one-way ticket and $160 for a round-trip.

  • Do I need a passport to fly between Philadelphia and Ontario?

    A passport is not required to fly from Philadelphia to Ontario.

  • Which aircraft models fly most regularly from Philadelphia to Ontario?

    We unfortunately don’t have that data for this specific route.

  • Which airline alliances offer flights from Philadelphia to Ontario?

    Star Alliance, SkyTeam, and oneworld are the airline alliances operating flights between Philadelphia and Ontario, with Star Alliance being the most commonly used for this route.

  • What is the most popular layover when flying to Ontario from Philadelphia?

    Phoenix is the most popular layover city among KAYAK users traveling from Philadelphia to Ontario.

  • Which is the best airline for flights from Philadelphia to Ontario, Southwest or Delta?

    The two airlines most popular with KAYAK users for flights from Philadelphia to Ontario are Southwest and Delta. With an average price for the route of $493 and an overall rating of 8.0, Southwest is the most popular choice. Delta is also a great choice for the route, with an average price of $478 and an overall rating of 7.9.

  • How does KAYAK find such low prices on flights from Philadelphia to Ontario?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Philadelphia to Ontario.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Philadelphia to Ontario?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Ontario from Philadelphia is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Philadelphia to Ontario?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Ontario with an airline and back to Philadelphia with another airline. Booking your flights between Philadelphia and ONT can sometimes prove cheaper using this method.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Philadelphia to Ontario?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Ontario from Philadelphia up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Reviews of the top 5 airlines serving from Philadelphia to Ontario

 
See real verified KAYAK customer reviews for airlines flying from Philadelphia to Ontario. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from Philadelphia to Ontario? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
8.0
SouthwestOverall score based on 4335 reviews
8.1Boarding
8.0Comfort
8.6Crew
7.5Entertainment
7.0Food
Airline reviews

Boarding was easy. The seats are small and fairly uncomfortable

8.0 ExcellentNicole, Mar 2026
LGB - OAK
Read more Southwest reviews

Boarding was easy. The seats are small and fairly uncomfortable

The problem with the seat assignments is that there were a lot of rows in the front that were empty but my row at the back was full. Just not so pleasant.

No food or entertainment, just a quick 40 minute flight. A little bumpy due to Santa Ana winds but pilot has no control over that. Good flight and landing!

Good but I prefer choose your own seat. With the new assigned seats they should board from the back I see no advantage to this new boarding. Just like every other airline

Mediocre. Boarding is now unpleasant. The employees, once friendly and nice, are now regularly speaking sternly to passengers, badgering them to do things right so they can take off on time and gate check bags because they don't have enough overhead bin space. The pretzel snack was crushed flat and broken into even smaller pieces, which happens frequently lately. Drink service was suspended before they reached my row.

The charges were ridiculous for an hour flight and the turbulence was very scary.

3 hour delay. Had to change plans and was still delayed.

The flight crew was extremely rude and especially not helpful when our flight was delayed.

The boarding and seat assignment system no longer works for me, but I know it is being replaced. Otherwise, I am good with the overall experience.

The lead steward kept singing about "San Francisco" and hotel California---more annoying than humorous....needs work. Flight was smooth and on time.

Arlene was a great flight attendant. I also liked how one of the other flight attendants gave us a heads up about snacks and asked everyone to remove their headphones when it was their turn to order. Good idea.

I haven’t flown economy in over 20 years but it was not bad. Room by my feet for my bag and seat was roomy enough. Surprised in a good way.

The cabin temperature was nice and cool. The wifi was not working.

As previously noted, this flight was great: departure was timely, the crew was friendly and attentive, and wifi connectivity was seamless. In particular, I appreciated that the flight attendant just told me to stow the laptop right before takeoff/landing, and trusted me to do so (which I did!).

Left a few minutes early. Got in 15 minutes early. Very attentive service on board. Very organized boarding.

There’s not much to say about a one hour flight. This is a connection from LA to RNO that I missed the previous night due to a mechanical check delay on my originating flight from JFK to LAX. The short flight itself was fine. Instructions from the pilot and crew were per usual. The coffee was barely lukewarm, which possibly was purposeful so we would down it quickly. Bags were already on carousel upon reaching baggage claim, which was excellent.

Delta continues to set the benchmark for traveler-friendly service with minimal disruption and clear communication within the mainland US (coast to coast). I am consistently pleased to be a Delta customer, and this experience once again met my expectations. There was a brief delay departing from MIA due to a technical issue that required the aircraft to return to the gate. However, the situation was handled professionally and transparently. Fortunately, my planned layover allowed ample buffer time, so the adjustment caused no stress. Overall, another smooth and reassuring experience.

Awesome! On time flight, early arrival, and a complimentary upgrade!

Was forced to check in my small carry on, even though I informed the crew it has very fragile items inside

They double booked seats, the gate staff changed my ticket as I was boarding she went over to the computer and changed it without telling me. She messed up an entire three row section for me and others. Other travelers were outraged but the gate staff were so rude, so condescending saying it wasn't their problem to solve. I would rate this a zero if I could. Will not fly Delta again I'll stick with United and American.

Terrible, if possible won't be flying again anytime soon!

Wonderful in-seat entertainment with seatback screens and huge selection of quality movies. The ability to bluetooth connect headphones was amazing.

Horrible service no Wi-Fi connection on both leg of the flight and they are refusing to fix bad service

I will never fly ANA again. They lost one of my large pieces of checked luggage, the heaviest one with the most valuable items in it, and they said they will not send me an email unless they can't find it, even though the paper they gave me to track the status of my lost luggage requires a code from an email they are supposed to send me so I can do baggage tracing. They claim to be an international airline, but they also insist on calling a Japanese telephone number to confirm where to send the lost baggage if they find it. It is impossible to find an actual contact email address for customer support on their website, and their AI chatbot is unhelpful, directing you to a webpage that says it is for contact information but does not have any actual email addresses or phone numbers listed on it. My seat in economy did not recline at all, even though I was not sitting in an exit row nor the very back row. I had to sit in the fully upright position for over ten hours of international travel. Awful experience overall.

Flight delayed for more than 16 hrs and no effort was spent to provide an alternate

Overall we had a good experience during our flight from San Francisco to Houston.

it was a very short flight so my expectations were low.

Very disappointing given gate agent behavior. Filed a formal complaint with United.

Flight delayed. WiFi connectivity very poor if not existant. Last minute arrival forced me to run to catch my connection.

The power at the seat didn't work and the seat itself was difficult to adjust - this was a business class seat. Flight attendant gave me miles to compensate. The attendant was very professional and on top of his game the entire flight.

Plane was super cold. No entertainment unless you were with mileage program Getting off the plane was super slow

I appreciate that I finally got the seat I paid extra for this time. Thank you

Half of the TSA checkpoints at PHL are closed. Also, there is no standby for first class passengers. You can only standby for coach. Very dated policy and inconsistent with peers.

It would have been nice if American tried to care.

Delayed initially because they couldn’t print the flight details. Poor instruction on delay. When I got on the plane the flight attendant argued with me about whether my carry on would fit (it did, although she didn’t acknowledge that). No greeting (other than arguing with me) getting on or off the plane.

Smooth flight. From the early boarding and all were on board before departure time and arrived early in ONT. Great crew. Thank you!!!!

Beverage service was not good. Also just one service in 5 hr 30 min flight. No ask fir water ir anything beside one time beverage service.

They are always late and seats was also not having working charger

This flight captain and crew were amazing, started ahead of time of departure and reached 30 mins before arrival time. Amazing!

Long delays, lack of information about the status of the flight. The flight was delayed 4 times.

Our flight was canceled. I will never use Kayak nor Frontier for travel again. The entire experience was a headache.

First of all we hade waited 3 hours in the airplane waiting to leave. Second the return schedule was changed and it messed up my entire vaction. I won't buy never again another flight and recommend to nobody traveling with them.

I am writing to express my disappointment with my recent Frontier Airlines flight. I was charged $99 at the gate because my bag was said to be too large, yet once onboard there was no available overhead bin space, and I was required to place the bag under the seat in front of me anyway. This made the charge feel unnecessary and unfair. Additionally, before the flight even took off, I was asked to move from the seat I paid for into a middle seat so another passenger and her cat could have my seat to themselves. I was not offered compensation or an explanation for being moved from a paid seat. Between the unexpected bag fee and being forced to give up my seat, this experience fell well below acceptable customer service standards. I would appreciate a review of this situation and appropriate compensation.

Terrible. Flight cancelled with no reasoning and no flights to rebook. Employees were useless and did nothing to help. Did not even know where to retrieve luggage from the cancelled flight. Flyers beware.

Terrible. The canceled my entire flight when I requested a refund for a trip frontier canceled trip one way.

i was unable to check in the flight. refund requested

I think Frontier was very good at communication. Their app worked very well. Loading was great and the flight was nice and easy.

Great for the price. No wifi or entertainment, but gate agents and crew were fantastic and we boarded quickly and left on time.

sluggish boarding and arrival procedures, fake nice flight attendants, and lots of delays.

Decent clean onboard experience. Okay discount airline experience. Unfortunately, any customer service interactions are difficult and unhelpful. There is no service. Also, a premium seat only gets you premium boarding if you line up first. Once they start general boarding you must go to the back of the line. Not very premium

Everything you need to know for your flight from Philadelphia to Ontario

Information on your arrival and departure airports