Cheap Flights from Philadelphia to Ontario International from $333

Compare Philadelphia to Ontario International flight deals

Find the cheapest month or even day of the year to fly to Ontario International

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Flight deals from Philadelphia to Ontario International

Looking for a cheap last-minute deal or the best return flight from Philadelphia to Ontario International? Find the lowest prices on one-way and return tickets right here.

Ontario.$333 per passenger.Departing Fri, 24 Apr, returning Wed, 29 Apr.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Philadelphia International on Fri, 24 Apr, arriving in Ontario International.Inbound indirect flight with Frontier Airlines, departs from Ontario International on Wed, 29 Apr, arriving in Philadelphia International.Price includes taxes and charges.From $333, select.

Ontario.$368 per passenger.Departing Sat, 9 May, returning Thu, 14 May.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Philadelphia International on Sat, 9 May, arriving in Ontario International.Inbound indirect flight with Frontier Airlines, departs from Ontario International on Thu, 14 May, arriving in Philadelphia International.Price includes taxes and charges.From $368, select.

Ontario.$474 per passenger.Departing Thu, 26 Mar, returning Thu, 2 Apr.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Philadelphia International on Thu, 26 Mar, arriving in Ontario International.Inbound indirect flight with Frontier Airlines, departs from Ontario International on Thu, 2 Apr, arriving in Philadelphia International.Price includes taxes and charges.From $474, select.

Ontario.$551 per passenger.Departing Thu, 26 Mar, returning Mon, 30 Mar.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Philadelphia International on Thu, 26 Mar, arriving in Ontario International.Inbound indirect flight with Frontier Airlines, departs from Ontario International on Mon, 30 Mar, arriving in Philadelphia International.Price includes taxes and charges.From $551, select.

Ontario.$561 per passenger.Departing Wed, 29 Apr, returning Sat, 2 May.Return flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Philadelphia International on Wed, 29 Apr, arriving in Ontario International.Inbound indirect flight with Southwest Airlines, departs from Ontario International on Sat, 2 May, arriving in Philadelphia International.Price includes taxes and charges.From $561, select.

Ontario.$644 per passenger.Departing Tue, 12 May, returning Sat, 18 Jul.Return flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Philadelphia International on Tue, 12 May, arriving in Ontario International.Inbound indirect flight with Southwest Airlines, departs from Ontario International on Sat, 18 Jul, arriving in Philadelphia International.Price includes taxes and charges.From $644, select.

Ontario.$644 per passenger.Departing Wed, 20 May, returning Sun, 23 Aug.Return flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Philadelphia International on Wed, 20 May, arriving in Ontario International.Inbound indirect flight with Southwest Airlines, departs from Ontario International on Sun, 23 Aug, arriving in Philadelphia International.Price includes taxes and charges.From $644, select.

Ontario.$690 per passenger.Departing Tue, 5 May, returning Tue, 2 Jun.Return flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Philadelphia International on Tue, 5 May, arriving in Ontario International.Inbound indirect flight with Southwest Airlines, departs from Ontario International on Tue, 2 Jun, arriving in Philadelphia International.Price includes taxes and charges.From $690, select.

Find the cheapest month to fly from Philadelphia to Ontario International

We’re always keeping an eye on fares, so you can find the best one in seconds. It looks like Philadelphia to Ontario International flights are currently cheapest in April.

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Philadelphia to Ontario International: Alternative routes

Compare routes from Philadelphia to Ontario below. You may find an airport to fly into that's cheaper, faster, or easier than Ontario International.

Philadelphia to Ontario: Flight information

The things to know before you go.

Cheapest flight found	$333
Cheapest month to fly	April

Finding cheap flights from Philadelphia to Ontario International: Frequently asked questions

How much are return flights from Philadelphia to Ontario International?

The best price we found for a return flight from Philadelphia to Ontario International is $333. This is an estimate based on information collected from different airlines and travel providers over the last 4 days and is subject to change and availability.

Which airlines fly direct from Philadelphia to Ontario International?

Currently, there are no airlines that fly direct from Philadelphia to Ontario International. But we found flights with one stop from $333.

How many flights are there a week from Philadelphia to Ontario International?

As of March 2026, there are no flights flying from Philadelphia to Ontario International.

When is the cheapest time to fly from Philadelphia to Ontario International?

The cheapest month to fly from Philadelphia to Ontario International is usually April.

Which upcoming date is cheapest to fly from Philadelphia to Ontario International Airport on?

After crunching the numbers on our flight calendar, we found that it is currently cheapest to fly from Philadelphia to Ontario International Airport on Friday, 24 April 2026.

Can I get a direct flight from Philadelphia to Ontario International Airport?

No airlines currently offer direct flights between Philadelphia and Ontario International Airport. Most routes have one or more stops.

How can I find the best flight deal to Ontario International?

We show every price from over 1,200 airlines and travel agents, comparing them all so you don’t have to. If you know you want to fly to Ontario International but you’re not ready to book, set up a Price Alert. We’ll track prices for you, and let you know when they rise or fall.

When is the best time to book flights to Ontario?

We crunched all the numbers in our flight calendar and it looks like the cheapest time to book a flight to Ontario is around 40 days in advance, so don’t leave your flight to the last minute.

Which is the cheapest airline to fly from Philadelphia to Ontario International with?

The cheapest airline that flies to Ontario International is Frontier Airlines .

Flying from Philadelphia to Ontario International Airport (ONT): What you need to know

Start your trip planning by looking up the ideal departure point for your flight from Philadelphia to Ontario International Airport (ONT). Explore your options for taking off from Philadelphia International Airport (PHL) or Trenton-Mercer Airport (TTN), two of the city's main airports.
The timezone in Ontario is UTC-7, which is three hours behind Philadelphia. Ontario International Airport is located in Ontario.
Leave plenty of time to catch your flight from Philadelphia to ONT. A good rule of thumb is to arrive two hours before international departures and an hour ahead for domestic flights.
Travelling during a peak time like a bank holiday? Expect longer queues at check-in and security. Give yourself extra leeway and arrive up to four hours before international flights and two hours before domestic departures.

Airports in Philadelphia

Philadelphia International Airport (PHL)

PHL is around 19 kilometres from central Philadelphia. If you're catching a cab, driving or ride-sharing from the centre, it'll take you 15 minutes or so to get there, depending on the traffic. If you're using public transport, expect the trip time to be around 45 minutes.
Want a stress-free start to your trip? Stay near Philadelphia International Airport. Whether you have an early flight from Philadelphia to Ontario International Airport or prefer not to rush, these hotels offer the perfect solution:
Of all flights leaving Philadelphia International Airport, 78.93% touch down on time at their destination.
You'll find PHL at 8500 Essington Ave.

Trenton-Mercer Airport (TTN)

TTN is around 56 kilometres from central Philadelphia. It'll take 40 minutes or so to get to the airport by car from the city centre. Public transport takes approximately 1 hour 45 minutes.
Want to enjoy an extra night away before boarding your Philadelphia to ONT flight? Check in to a hotel near Trenton-Mercer Airport before your adventure officially begins. These stays have a room with your name on it:
Trenton-Mercer Airport has a reputation for reliability and timeliness. 82.45% of flights departing here make it to their final destination as planned.
You'll find TTN at Scotch Road, Terminal Building.

About Ontario International Airport (ONT)

Have a late flight from Philadelphia to Ontario International Airport? Don't let it hijack your sleep schedule. Stay at one of these hotels near ONT and shut your eyes sooner:
Grab an Ontario International Airport rental car and explore Ontario and beyond with your own wheels. Dollar, Fox - Rent A Car and Thrifty are top providers you can book with here.
To get the lowest price, book your ride around three weeks ahead of your Philadelphia to Ontario International Airport flight.
ONT is located at 2900 E. Airport Drive.

Getting from Ontario International Airport (ONT) to central Ontario

Central Ontario is around 5 kilometres from Ontario International Airport. Journey times by cab or car hire will vary depending on traffic conditions, so do a little research before your trip.
If you're taking public transport, expect a journey time of roughly 1 hour 30 minutes.

How to find the cheapest flights from Philadelphia to Ontario International Airport (ONT)

$176 is the best price for a one-way ticket from Philadelphia to Ontario International Airport. Return flights start from $333. These fares can change depending on demand and availability.
Booking ahead of time is often the key to scoring a cheap flight from Philadelphia to ONT. Airlines adjust prices based on demand, so the closer your departure date, the more you'll likely spend on your ticket.
If you have some flexibility with your travel dates, use the 'Whole month' search tool. It'll give you the lowest price across every month when searching for your Philadelphia to Ontario International Airport ticket.
Save time searching for cheap flight tickets from Philadelphia to ONT by setting up a Price Alert. We'll send you an email or notification through the app when a new discounted fare appears.
Tailor your trip using filters. Select your ideal departure and arrival times, total journey duration and airlines. You can also sort the results by 'Best,' 'Cheapest' or 'Fastest' flights from Philadelphia to Ontario International Airport.

The best time to fly from Philadelphia to Ontario International Airport (ONT)

It's time to figure out your travel dates for your flight from Philadelphia to Ontario International Airport (ONT). August is when most people travel to Ontario. If you like your getaways a little more chill, go in May.
The warmest month in Ontario is August, with temperatures ranging between 15ºC and 35ºC. Lock in your Philadelphia to ONT flight ticket then if that's your ideal forecast.
Search for cheap tickets from Philadelphia to Ontario International Airport in January if you'd rather travel when it's cooler. Temperatures are at their lowest then, ranging between 4ºC and 23ºC.

More about Ontario

After booking your flight from Philadelphia to Ontario International Airport, find a hotel that offers a good mix of location and comfort. Make one of these accommodation options your base for exploring Ontario:
Conservation Park and Citizens Business Bank Arena are just the start of the top attractions to add to your Ontario to-do list. Keep the adventure rolling by checking out Scandia.

Explore more of the United States

San Diego is just one of the many places in the United States waiting to be explored after you've experienced Ontario. Around 153 kilometres away to the south, well-known attractions include San Diego Zoo, San Diego Balboa Park and USS Midway Museum.
If you're eager to discover another major destination in the United States, head for Bakersfield, about 193 kilometres north-west of Ontario. Kern County Museum, Dr. Martin Luther King, Jr. Park and BAPS Shri Swaminarayan Mandir are among its highlights.