ONT - PHL

$118 Find Cheap Flights from Ontario to Philadelphia - 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 Ontario to Philadelphia departing on 8/10. 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

Save 21% or more on flights. Compare deals from all over the web.

Never overpay with our price tracking tools.

Filter searches by price, airline and more to find your best flights.

Everything you should know

Cheapest round-trip
$304
Typical prices: $286-$487
Frontier
Tue 7/21Tue 7/28
ONT - PHL • 1 stop
Cheapest one-way
$118
Typical prices: $176-$190
Frontier
Mon 8/10
ONT - PHL • 1 stop
Top airlines
Cheapest • from $304 (round-trip)
Best reviews • 7.9 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
Nonstop flights
Not available
There are currently no direct flights between Ontario and Philadelphia. You'll need at least 1 connection.
Insights
Insights
Insights
Insights
Top layover airports
Cheapest • Avg $292 (round-trip)
Shortest trip • 7h 23m (one-way)
Insights
Insights
Insights
Insights
When to book
in advance
Our data shows that travelers who book at least 3 weeks in advance save around 28% compared to booking last minute.
Insights
Insights
Insights
Insights
When to travel
Cheapest • 27% price drop
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
Start a new search
KAYAK searches 100s of sites at once to find you the best travel deals.
We hope you love your trip to Philadelphia!
Flight Deals
Booking Insights
Flight Deals

Cheap Flights from Ontario to Philadelphia (ONT-PHL)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Ontario to Philadelphia 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 Ontario to Philadelphia

Tue, Jul 21 - Tue, Jul 28
Frontier Logo
3:40 pm - 6:00 am
ONT
-
PHL
11h 20m
1 stop
Frontier Logo
4:30 pm - 7:32 am
PHL
-
ONT
18h 02m
2 stops
$304Frontier
Mon, Jul 27 - Fri, Jul 31
Frontier Logo
3:40 pm - 6:00 am
ONT
-
PHL
11h 20m
1 stop
Frontier Logo
12:54 pm - 11:50 pm
PHL
-
ONT
13h 56m
1 stop
$305Frontier
Tue, Jul 28 - Sun, Aug 2
Frontier Logo
3:40 pm - 6:00 am
ONT
-
PHL
11h 20m
1 stop
Frontier Logo
12:44 pm - 11:50 pm
PHL
-
ONT
14h 06m
1 stop
$306Frontier
Wed, Oct 21 - Sat, Oct 24
Delta Logo
5:52 pm - 5:45 am
ONT
-
PHL
8h 53m
1 stop
Delta Logo
7:20 am - 12:22 pm
PHL
-
ONT
8h 02m
1 stop
$307Delta
Mon, Jul 20 - Fri, Jul 24
Frontier Logo
8:17 am - 7:29 pm
ONT
-
PHL
8h 12m
1 stop
Frontier Logo
11:06 am - 11:07 am
PHL
-
ONT
27h 01m
2 stops
$308Frontier
Mon, Jul 20 - Thu, Jul 23
Frontier Logo
8:17 am - 7:29 pm
ONT
-
PHL
8h 12m
1 stop
Frontier Logo
8:37 pm - 10:04 am
PHL
-
ONT
16h 27m
1 stop
$309Frontier
Thu, Jul 16 - Fri, Jul 24
Frontier Logo
3:40 pm - 6:00 am
ONT
-
PHL
11h 20m
1 stop
Frontier Logo
11:06 am - 3:54 pm
PHL
-
ONT
7h 48m
1 stop
$310Frontier
Fri, Jul 17 - Sat, Jul 25
Frontier Logo
3:40 pm - 6:00 am
ONT
-
PHL
11h 20m
1 stop
Frontier Logo
12:44 pm - 10:04 am
PHL
-
ONT
24h 20m
1 stop
$311Frontier
Fri, Oct 23 - Wed, Oct 28
Frontier Logo
3:57 pm - 2:02 pm
ONT
-
PHL
19h 05m
1 stop
Frontier Logo
7:10 am - 11:55 pm
PHL
-
ONT
19h 45m
2 stops
$312Frontier
Thu, Aug 20 - Mon, Aug 24
Frontier Logo
6:00 am - 10:33 pm
ONT
-
PHL
13h 33m
2 stops
Frontier Logo
8:00 am - 4:22 pm
PHL
-
ONT
11h 22m
1 stop
$313Frontier
Booking Insights

KAYAK's insights & trends for Ontario to Philadelphia flights

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

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

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

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

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Ontario to Philadelphia, 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 Ontario to Philadelphia is September, where tickets cost $305 (return) on average. On the other hand, the most expensive months are October and March, where the average cost of round-trip tickets is $498 and $466 respectively.

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

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights from Ontario to Philadelphia, 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 Ontario to Philadelphia, you should book around 3 weeks before departure, which saves you about 28% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 11 weeks before departure.

Good to know

Low seasonJanuary
Cheapest flight$118
Best time to beat the crowds with an average 1% drop in price.
Most popular time to fly with an average 11% increase in price.
Flight from Ontario to Philadelphia

When to book flights from Ontario to Philadelphia

Are your dates flexible? Find out the best times to travel from Ontario to Philadelphia 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 Ontario to Philadelphia

  • Which amenities can I enjoy if I upgrade to business class on flights from Ontario to Philadelphia?

    On-board amenities on the Ontario to Philadelphia flight route can vary depending on the airline. Some exclusive amenities when flying business class include additional luggage allowance, in-flight entertainment, complimentary snacks and drinks, a lie-flat seat, a blanket, and additional legroom. So, upgrading to business class is a great decision on this long-haul flight.

  • What are the common layovers on flights from Ontario to Philadelphia?

    After booking cheap flights from Ontario to Philadelphia, expect a stop or more depending on your airline's flight route. The layover city and duration also vary among airlines. The common layovers are major cities, including Phoenix, Chicago, Charlotte, Dallas, Houston, Denver, Las Vegas, Houston, Salt Lake City, Austin, Atlanta, Oakland, Dallas, Austin, San Francisco, Portland, Orlando, and Seattle.

  • What is the carry-on and checked luggage allowance in economy class for flights from Ontario to Philadelphia?

    The carry-on and checked luggage allowances depend on the airline. If you book Frontier Airlines, your carry-on should be 24 x 16 x 10 inches at most. You’re allowed to bring an additional bag weighing at most 50 lb. If you book American Airlines, your carry-on should be a maximum of 22 x 14 x 9 inches, and another bag with a maximum weight of 50 lb is allowed.

  • What’s the most convenient way to travel from Philadelphia International Airport to downtown Philadelphia?

    The airport line train is a reliable way to travel to downtown Philadelphia from PHL airport. These trains depart hourly, and the trip takes about 24 minutes. Another option is the Line 37 bus that gets to the city in approximately 39 minutes. You can also rent a car at the airport terminal and drive to your destination.

  • What is the cheapest flight from Ontario to Philadelphia?

    In the last 5 days, the lowest price for a flight from Ontario to Philadelphia was $118 for a one-way ticket and $304 for a round-trip.

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

    No, a passport isn't needed to fly from Ontario to Philadelphia. However, local authorities might ask for an official ID.

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

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

  • Which airline alliances offer flights from Ontario to Philadelphia?

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

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

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

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

    The two airlines most popular with KAYAK users for flights from Ontario to Philadelphia are Southwest and Delta. With an average price for the route of $487 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 $393 and an overall rating of 7.8.

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

    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 Ontario to Philadelphia.

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

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Philadelphia from Ontario 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 Ontario to Philadelphia?

    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 Philadelphia with an airline and back to Ontario with another airline. Booking your flights between Ontario and PHL 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 Ontario to Philadelphia?

    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 Philadelphia from Ontario up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

KAYAK’s top tips for finding a cheap flight from Ontario to Philadelphia

  • Frontier Airlines offers an eco-friendly journey on cheap flights from Ontario (ONT) to Philadelphia (PHL). This airline ensures environmental sustainability by using fuel-efficient aircraft and reducing carbon emissions during operations.
  • Ontario International Airport (ONT) is a hub for West Coast Air. At the same time, Philadelphia International Airport (PHL) is a hub for American Airlines. This airport is a gateway for transatlantic and European destinations.
  • The Line 61 bus offers a convenient journey from downtown Ontario to ONT airport. These buses arrive at the airport in about 10 minutes and depart every 30 minutes. You can also take a shuttle or a taxi to arrive at the airport in approximately 5 minutes.
  • You can book Aer Lingus from Ontario to Philadelphia if you need a special meal. This airline offers a wide range of special meals, including gluten-free, vegetarian, and diabetic. You need to order up to 24 hours before departure, but for kosher meals, you must request 48 hours prior to your flight.
  • PHL airport serves several nearby cities. After arriving, you can visit Darby to the north, Woodbury to the west, Springfield to the northwest, Chester to the southwest, and Camden to the northeast. You can rent a car at the airport and drive to your destination.

Reviews of the top 5 airlines serving from Ontario to Philadelphia

 
See real verified KAYAK customer reviews for airlines flying from Ontario to Philadelphia. 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 Ontario to Philadelphia? 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 4250 reviews
8.0Comfort
8.1Boarding
7.5Entertainment
7.0Food
8.6Crew
Airline reviews

I think Southwest is the number one airline that anyone can fly I have flown for the first time Frontier and what a joke and their customer service United was a very strange experience I'm only sticking to Southwest from here on out for sure

10.0 Excellentkelly, Jul 2026
SFO - PHX
Read more Southwest reviews

I think Southwest is the number one airline that anyone can fly I have flown for the first time Frontier and what a joke and their customer service United was a very strange experience I'm only sticking to Southwest from here on out for sure

Great job Southwest! My family doesn't fly often but we felt safe the whole time.

Flight was delayed, full flight and I had to change gates. Southwest flights are always late later in the day.

Was fine, delayed and feels like southwest is always late

The entire experience from boarding to landing was amazing! The crew were very friendly. Will definitely be back.

Delayed flight, lack of information, boarding process is a mess as is the carryon luggage causing issues when leaving the plane….just a poor experience.

I flew twice this week on Southwest, was delayed over 2 hours both ways. From Pittsburgh to Chicago it was due to weather but the gate agents, pilot etc were great at updating everyone. Today from Midway to Pittsburgh the plane had come from an international location, kept getting delayed, no information was given until we were delayed for the third time. It was ridiculous, whoever scheduled that plane to fly to Pittsburgh after didn’t consider a lot of things.

The crew was very nice and respectful and everything went well.

Having a direct flight between Pittsburgh and Austin makes traveling so easy.

I liked receiving attention from aged and well experienced flight attendants. I disliked the non-gluten-free snack but I brought my own so I was OK.

My tray was broken so i had no place to work or eat except my lap. Flight attendant said I would get an email with some credit or miles, it was a complete waste of time as I could only function at about 20% of normal. I have not received anything yet.

Originally, I was booked in economy. I paid several hundred additional dollars to upgrade to first class. Then I paid several more hundred dollars to change my flight to a slightly earlier flight. I asked if the changed flight would also seat me in first class, and I was told that it would. When I boarded the plane, however, I was seated in economy. So, I paid $500-600 more than I paid for my original ticket for an upgrade and a changed flight - received the changed flight (which was nice), but did not receive the upgrade. So, I was not completely satisfied.

Delayed due to thunderstorms and no in-flight service due to rough weather — both of which are out of Delta’s control. Flight was good overall.

It was a great flight and the stewards and stewardess were all kind and accommodating!! The seats were comfortable and entertainment screen excellent!

737-800 in first class was pretty dumpy. Seat had an uncomfortable angle, storage under the seat was blocked so even my very modest backpack didn't fit, power outlet was flaky. Weird tiny seat pockets that couldn't hold a gallon ziploc bag, emesis bag missing, etc. etc. No in-flight service due to turbulence. Crew was excellent, boarding was smooth despite a full flight.

This was the second flight this week with flight attendant Marcus I’m not sure if his last name is Lane or Lang but this guy is awesome. He funny, attentive and his service is 5 stars. Marcus makes business travel more enjoyable !

My seat was moved closer to the front of the cabin since I had requested wheelchair assistance to the gate.

Carly the flight attendant was extremely helpful and very accommodating to passengers on the flight from what I noticed. Couldn't be more satisfied with the service and assistance from Delta's flight attendant, Thanks again Carly!!

The flight was overbooked and the staff at the gate started calling for volunteers to drop out and offering incentives. That delayed the flight

There was no wifi even after my husband paid for wifi it wasn’t working. The plane looked and felt old.

Great staff. Clean plane, but we were delayed for more than an hour due to maintenance issues and had to board another plane.

Lost one piece of luggage even though I checked in 2.5 hours before the flight

Seat pitch is horrible especially on the 15 hour flight. Gate crew at SFO was Outstanding. The flight crew was also great.

United didn’t even try to hold the flight for me. They knew I had a tight connection and when I arrived at the gate less than 10 mins after final boarding the flight had already gone. The gate agent wasn’t even notified that I was on my way. She was told I wasn’t at the airport

Everything went well except the turbulence what no one have a control of but pilot and crew handled very good!

I still prefer Delta, but Delta doesn’t fly to State College PA.

This flight was delayed multiple times and eventually canceled around 2-3ish. Original take off time was around 10:30am. By 3, there were no other options out of Houston, so stuck in Houston for from 3pm - 11am the next day.

Nothing bad to say about the actual crew or airline. It was nice to have a complimentary FULL can of soda, as well as a snack. Blankets and earbuds were also provided at no cost for this red eye flight. I especially appreciated the free WiFi and movie selection with the Bluetooth option. It helped the flight pass more quickly. No matter who you fly, boarding and disembarking are always SUCH a pain. As I mentioned, this is on the passengers and not the crew!!

Flight attendants rude and impolite… flight delayed by almost 5 hours.

Ok so apparently the new policy on United Airlines is that customers in the main cabin should NEVER be served more than once and besides picking up trash there should NEVER be another interaction with the customer for any reason.

Left early arrived early..right amount of talking from pilots..of course had to love the biscuit and water!

Flight boarded from Gate 159B, the farthest gate in the LAX Bradley Terminal. While the flight operated on time, the first class cabin attendant made no recognition of my being an Advantage Executive Platinum member.

The entertainment options were at best, fair. It was exactly the same as my outbound flight. It would have been more entertaining if there were some series from Apple TV, HBO, Showtime or other carriers for me to catch up with.

Very crowded flight but what can you expect these days?? Crew was accommodating.

The seats in economy were appeared to be quite thin and lack sufficient cushioning to be comfortable. Perhaps it was my seating position but the plane seemed notably load.

This was an overnight flight. There was no meal service in first class, just a simple snack basket was offered along with beverages. There should have been some type of continental breakfast prior to arrival in PHL. As an Executive Platinum American Airlines Advantage member, I received no name recognition from the first class flight attendant. When disembarking at PHL, the flight attendants were more interested in their cell phones than saying "thank you" to the passengers as they disembarked.

This is a new route from Philadelphia to Naples. It was sold out. The team on board was excellent. I’ve flown this route twice this year and the flight has been excellent. I hope American keeps the route.

The A321(?) model of the flight for 5+hrs has no seat back screens. Getting the american airlines wifi experience to watch movies on your own devices is not the same.

The experience was great and much better than the flight going out. of course I was in first class but the service was excellent

Food options were limited which is absolutely embarrassing for a Flight of this size The staff did not come around as much and I am not accustomed to such poor service from American Airlines Drinks I believe were limited to soda and water

Not clean and was told I would get a great seat and it was not great at all

No knowledgeable staff at the counter or in a flight crew. No one knew why once flight landed at Philadelphia Airport then it took them 4 hours from runway to gate . Damn they took 4 hours to reach the gate . They messed up whole night for myself and for my kids.

Horrible communication about delay of flight and what options were available

Online check-in was not user-friendly. Too many fees, not cost effective.

FRONTIER SUCKS! The agent downstairs tricked me into booking, just to get to the gate. At the gate, they told me they couldn't help. I then called Customer Service. They and the gate attendants kept blaming each other. Neither side was willing to help the customer.

My experience with frontier staff at the Denver airport was absolutely horrible. The manager on duty was even worst if was the worst experience I have ever had, I have never been treated so poorly as a customer in my life! The staff was extremely rude, eye rolls and attitude and then refusal to help me at all. I wish I could never fly frontier again that’s how horrible it was!

Good for the price. My only complaint is that the pilot should keep the air flowing while passengers are waiting to getting out of airplane.

I arrived 1 hour prior to boarding, and they said I was too late for a domestic flight. First time I heard that :-(

Crew members are very rude and not cooperate with passengers.

Well, I didn’t have food! So NA wasn’t an option. I’ll be back!

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

Information on your arrival and departure airports