PHL - ONT

$117 Find Cheap Flights from Philadelphia to Ontario - Compare and Save

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 7/30. 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
$236
Typical prices: $358-$507
Frontier
Mon 7/27Fri 7/31
PHL - ONT • 1 stop
Cheapest one-way
$117
Typical prices: $168-$278
Frontier
Thu 7/30
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.
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Top layover airports
Cheapest • Avg $329 (round-trip)
Shortest trip • 7h 39m (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 48% compared to booking last minute.
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When to travel
Cheapest • 14% price drop
Most popular
Good to know
Good to know
+1
+1
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+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

Mon, Jul 27 - Fri, Jul 31
Frontier Logo
11:06 am - 3:54 pm
PHL
-
ONT
7h 48m
1 stop
Frontier Logo
8:17 am - 7:29 pm
ONT
-
PHL
8h 12m
1 stop
$236Frontier
Thu, Aug 6 - Tue, Aug 11
Frontier Logo
11:06 am - 3:54 pm
PHL
-
ONT
7h 48m
1 stop
Frontier Logo
8:17 am - 7:29 pm
ONT
-
PHL
8h 12m
1 stop
$237Frontier
Wed, Aug 12 - Thu, Aug 20
Frontier Logo
12:44 pm - 11:50 pm
PHL
-
ONT
14h 06m
1 stop
Frontier Logo
3:40 pm - 6:30 am
ONT
-
PHL
11h 50m
1 stop
$240Frontier
Sat, Aug 1 - Sat, Aug 8
Frontier Logo
11:06 am - 8:03 am
PHL
-
ONT
23h 57m
1 stop
Frontier Logo
8:17 am - 7:29 pm
ONT
-
PHL
8h 12m
1 stop
$241Frontier
Thu, Jul 23 - Mon, Jul 27
Frontier Logo
12:44 pm - 11:50 pm
PHL
-
ONT
14h 06m
1 stop
Frontier Logo
3:40 pm - 6:00 am
ONT
-
PHL
11h 20m
1 stop
$242Frontier
Sat, Jul 25 - Sat, Aug 1
Frontier Logo
11:06 am - 8:03 am
PHL
-
ONT
23h 57m
1 stop
Frontier Logo
11:52 am - 6:00 am
ONT
-
PHL
15h 08m
1 stop
$243Frontier
Mon, Jul 20 - Thu, Jul 23
Frontier Logo
11:06 am - 3:54 pm
PHL
-
ONT
7h 48m
1 stop
Frontier Logo
3:40 pm - 6:00 am
ONT
-
PHL
11h 20m
1 stop
$244Frontier
Wed, Jul 29 - Sat, Aug 1
Frontier Logo
11:06 am - 8:03 am
PHL
-
ONT
23h 57m
1 stop
Frontier Logo
8:17 am - 7:29 pm
ONT
-
PHL
8h 12m
1 stop
$245Frontier
Sun, Aug 2 - Tue, Aug 11
Frontier Logo
8:37 pm - 10:04 am
PHL
-
ONT
16h 27m
1 stop
Frontier Logo
8:17 am - 7:29 pm
ONT
-
PHL
8h 12m
1 stop
$246Frontier
Sat, Aug 1 - Sat, Aug 8
Frontier Logo
11:06 am - 8:03 am
PHL
-
ONT
23h 57m
1 stop
Frontier Logo
8:17 am - 7:29 pm
ONT
-
PHL
8h 12m
1 stop
$247Frontier
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 July.

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 September, where tickets cost $358 (return) on average. On the other hand, the most expensive months are March and December, where the average cost of round-trip tickets is $492 and $486 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 48% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 22 weeks before departure.

Good to know

Low seasonMarch
Cheapest flight$117
Best time to beat the crowds but there is an average 18% increase in price.
Most popular time to fly with an average 16% 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 5 days, the lowest price for a flight from Philadelphia to Ontario was $117 for a one-way ticket and $236 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.

  • 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 $497 and an overall rating of 7.9, Southwest is the most popular choice. Delta is also a great choice for the route, with an average price of $358 and an overall rating of 7.8.

  • 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.
7.9
SouthwestOverall score based on 4246 reviews
8.0Comfort
8.6Crew
7.5Entertainment
7.0Food
8.1Boarding
Airline reviews

The flight was late. The crew was rude. There was no food. Cramped and uncomfortable. Nothing about this flight was good.

2.0 MediocreIrene, Jun 2026
DEN - SFO
Read more Southwest reviews

The flight was late. The crew was rude. There was no food. Cramped and uncomfortable. Nothing about this flight was good.

It was just okay, no frills, basic transportation with no luxury. No screens on the seats, no water or drinks on a short flight. Full flight but at least it was on time.

The first time I flew in the extra legroom section. It was difficult to notice a difference. I had bad luck with my neighbors. The crew was okay. Southwest has reduced the live TV options.

No gluten free snacks. Seats felt worn or bare bones even though it was a new 737 MAX 8.

Plane was clean and comfortable. Flight attendants and gate staff were professional, friendly and efficient. Boarding and deplaning were orderly and efficient. All in all, the typical excellent Southwest experience.

Not having a five hour delay with little notice! The crew was very kind, though, and just as tired as we passengers were. The flight didn't depart until nearly 1 am...and no reason was ever given.

For my birthday trip this was my second time ever flying, this trip was the best.

We boarded the flight and set two and a half hours on the jetway. Would have been better if they had not boarded us at all. Plane was hot and it was limited ability to access the restrooms or get a drink of water. Very unpleasant experience

Our flight to Oakland was great bc the plane was new but it was delayed by 15min not bad at all. Over all it was an 8/10

The flight in it self was good. The delays looking for pilots was unexpected.

Love me some Delta. One of the few airlines to recognize and support veterans. Easy boarding, flight was on time and arrived early and the flight attendants were excellent on this flight.

We sat on the runway for over an hour before departure. That was unwelcome.

Flight delayed four separate times. I’m now one hour hours late to landing.

worst flight ever from Delta, it got delayed and kept on delaying..

Connection flights should be spaced out farther because too close I missed my connection.

Everything went smoothly, although the usual gripes about airline travel were still present: the boarding process is inefficient, the snack selection is limited, and so on. Since there was extra space on the flight, the gate agent rearranged many people's seats to put people on the aisles and windows, leaving the middle seats empty, as much as possible, which was pretty great.

While they turned off most cabin lights to allow people to sleep, I was bothered by how bright the side lights still were. It was still quite bright for me in a window seat, when I wish I could have slept!

One of the flight attendants was a little cranky. I appreciated the free wifi and plug to charge my laptop

The gate attendants and the crew were terrible. Because of high winds, they needed to carry more fuel, so they had to get volunteers to take the next flight at 6 am the next day. They did a terrible job of it - our flight ended up taking off just under 3 hours of the scheduled time. I hope to never fly Delta again.

My flight consistently said it was on time and the plane didn’t arrive until after 30 minutes after take off and nothing was announced to passengers

This was an overnight flight, and in the morning they did know coffee service. How you can throw passengers in a San Francisco airport at 5:40 a.m. in the morning and not giving them Coffee is a crime.

Our flight was delayed several Times due to mechanical issues. Although I understand this may happen at times, it was very inconvenient and we had to book a hotel for an overnight stay. We were traveling with my 3-yo grandson and waiting at the airport from noon until 6:30pm with no reassurance that our next rescheduled flight would depart, we had to decide what’s best for him. A day later, I found out that I may be able to demand compensation if my flight is delayed more than 4 hours. I will hav to read the fine print next time.

Service was professional and quick. Premium economy seat was comfortable given the class

Like: departed and arrived on time. Unlike: Food options for purchase allways bad, 1 of 2 of the crew members not very friendly at all. Seats and leg room aweful. At this point I am thinking on switching to AA.

newer aircraft, ability to connect my headset via blue tooth for entertainment.

My husband and I recently had an unfortunate experience with Lufthansa. At the Philadelphia International airport, the ground staff refused to board us because we didn’t have a current visa stamped on our passports for Frankfurt. We completely understand that this was our mistake. we should have double-checked the visa requirements before our trip. However, the issue that upset us most was how the situation was handled by the staff. They told us they would mark it as “boarding denied due to visa issue”, but instead they recorded it as “no show”. Because of that incorrect entry, our return flight was automatically cancelled as well, which caused additional stress and expense. Mistakes can happen, but we expected more transparency and accuracy from a reputed airline like Lufthansa. It would have made a big difference if the staff had been more careful and considerate in documenting the situation correctly.

Everything was good, except the seats in economy were so close together, you could barely get out when the seat in front of your was reclined. If the airlines keep jamming in more and more seats, it will become intolerable. I will look for another airline that considers customer comfort and does not keep adding more rows of seats for more profit.

Flight attendant moved my bag without notifying me and was rude to me when I asked him about it. There was no reason to move it.

Flight was on time, crew were excellent. For some reason our originally selected seats were changed. We had to re-choose our seats when we checked in online and options were limited. One of our two checked bags we placed on the wrong carousel. It was only be shear luck that I saw it. That cost us 20 minutes of wasted time. So much for the “priority” tags. They are meaningless, and have been ever since they were implemented. I wish you would do the save some money and stop using them.

Airline did not explain reasons why flight was delayed two hours. Explanations were badly needed and rarely provided. Problem seemed to clearly be the airline’s fault and not the fault of the weather or airport.

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

Everything about the flight was lovely. My only suggestion would be to offer a few more options of tv series from Apple TV or HBO.

Did not get the seat I selected and paid for.

Honestly, I haven’t flown American in years, probably due to the pandemic and my being unable to travel for certain periods in the last two years, but it was a good experience to dig out or obtain a new American Airlines account after many years of traveling for business with American in the past.

One bottle of water and a package of cookies for comfort plus. We had to literally beg a flight attendant for an extra bottle of water later in the flight due to feeling dehydrated.

For coast to coast travel the A321 and even the NEO, even in first class will never be excellent. That would take a B787 or 777 to accomplish.

I was unhappy with having the seat I chose changed at the last minute. I was moved to an aisle seat which did not recline and was next to the bathroom. The bathroom odors made the flight entirely unpleasant. Having carefully chosen my seat months before I was not pleased with my AA experience. In addition, they ran out of tea during flight service, really?

There were delays on both ends. It made it less than excellent. This plane was great though

Attendants were rude. Scowling. Seats were miserable and we paid extra.

We experience delays on departure and connecting flights resulting in 14 hour to our next departure. We were accommodated with a night's stay but was only provided a 12 dollar meals accommodation. The airlines rules state.at least 50 dollars. In any case, it can not make up for the whole day missed on our vacation in Sydney Australia.

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.

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

The crew was mostly okay. The flight attendant who answered our questions was curt and unhelpful unfortunately. He seemed upset and I understand having off days.

You get what you pay for nothing essentially but a hard uncomfortable seat that doesn’t recline and kids screaming all around you and chaotic boarding and limited check bag weight allowance when compared to other airlines

Not very good. Paid in excess of $400 for assigned seating for my family and that was not provided. I want that money back.

Flight was cancelled and was not able to get another flight thru Frontier. Per frontier a refund was issued but I do not see a refund on my Afirm account.

The agent at check-in was strident, unwelcoming, and condescending to customers ahead of me.

Was charged 99 dollars for a bag despite agents previously telling me it would be ok. Customer service was unhelpful

I will like you ( Frontier Airlines) to fly into LAX instead of ONT because I live in LA and the subway takes me to my house in just 15 minutes

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

Information on your arrival and departure airports