Cheap Flights from Philadelphia International (PHL) to Ontario International (ONT)

Compare Philadelphia International to Ontario International flight deals

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

Book the best Ontario International fare with no extra fees

Flight deals from Philadelphia International to Ontario International

Looking for a cheap last-minute deal or the best return flight from Philadelphia International Airport to Ontario International Airport? If you want to travel next month, return fares start from £155. Find the lowest prices on one-way and return tickets right here.

Find the cheapest month to fly from Philadelphia International to Ontario International

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

Philadelphia to Ontario: Flight information

The things to know before you go.
Cheapest flight found£60
Cheapest month to flyMay

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

The best price we found for a return flight from Philadelphia International to Ontario International is £136. 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.
Currently, there are no airlines that fly direct from Philadelphia International to Ontario International. But we found flights with one or more stops from £136.
As of May 2026, there are no flights flying from Philadelphia International to Ontario International.
The cheapest month to fly from Philadelphia International to Ontario International is usually May.
After crunching the numbers on our flight calendar, we found that it's currently cheapest to fly from Philadelphia International Airport to Ontario International Airport on Tuesday, 26 May 2026.
No airlines currently offer direct flights between Philadelphia International Airport and Ontario International Airport. Most routes have one or more stops.
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.
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.
Currently, Frontier Airlines offers the cheapest flight tickets to Ontario International.

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

  • Ontario is three hours behind Philadelphia and observes the UTC-7 timezone.

  • Your PHL to ONT flight won't wait if you're running late, so get to the airport on time. Arrive up to one hour in advance for domestic flights and two hours ahead when you're flying internationally.

  • You can expect longer queues in popular months like August. Arriving up to four hours in advance for international flights and two hours for domestic departures will help ensure a smooth travel experience.

  • Consider adding a stopover when booking your ticket from Philadelphia International Airport to Ontario International Airport. Just deselect 'Direct flights only' to break up your trip, or maybe even explore a new city along the way. Here are some options between PHL and ONT:

    • Denver International Airport

    • Chicago Midway International Airport

    • Phoenix Sky Harbour International Airport

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

  • £60 is currently the best price for a one-way Philadelphia International Airport to Ontario International Airport flight. A return flight starts from £136. These prices may change based on demand.

  • To score cheap tickets from PHL to ONT, book early. Airlines typically offer lower fares when flights are first released.

  • If you can be flexible with your travel dates, use the 'Whole month' search tool. It'll find the lowest price in every month when looking for a flight from Philadelphia International Airport to Ontario International Airport.

  • Snapping up cheap flights from PHL to ONT is easy with Price Alerts. All you need to do is set up one of these automatic alerts and we'll let you know as soon as there's a better deal.

  • Find the right flight for you with the help of the filters. To see the 'Cheapest,' 'Fastest' or 'Best' flights from Philadelphia International Airport to Ontario International Airport, use the 'Sort by' tool. You can also filter by arrival and departure times, airline, and journey duration.

Handy information about Philadelphia International Airport (PHL)

  • PHL is located at Industrial Highway and Island Road.

  • 78.93% of flights that take off from Philadelphia International Airport make it to their destination on schedule.

  • To reach Philadelphia International Airport from central Philadelphia, it'll take around 15 minutes if you're going by car. This depends on traffic though. It's approximately 12 miles from the airport to the city centre.

  • The journey when using public transport will take about 45 minutes.

  • Need a convenient hotel near PHL? If you've booked an early flight from Philadelphia International Airport to Ontario International Airport, these accommodation options will have you sleeping moments from your check-in counter:

Arriving at Ontario International Airport (ONT)

Getting from Ontario International Airport (ONT) to central Ontario

  • You'll find ONT at 2900 E. Airport Drive.

  • From Ontario International Airport, Ontario is approximately 4 miles away. It takes around 10 minutes to reach the centre driving.

  • If you're using public transport, expect a journey time of roughly 1 hour 30 minutes.

When to fly to Ontario International Airport (ONT)

  • The quietest month for a flight from Philadelphia International Airport to Ontario International Airport is May, while August is the busiest. Choose the ideal time to visit Ontario based on whether you prefer a bustling atmosphere or a more laid-back vibe.

  • Lock in your flight from Philadelphia International Airport to Ontario International Airport for August if you want to explore Ontario during its warmest month. Expect temperatures of between 15ºC (59ºF) and 35ºC (95ºF).

  • January sees average temperatures of between 4ºC (39ºF) and 23ºC (73ºF). Look for cheap tickets from PHL to ONT sometime around then if you like travelling in cooler conditions.

Explore more of United States

  • You've seen Ontario, now it's time to discover other corners of United States. Journey about 35 miles west to Los Angeles to check off its top attractions. From Griffith Observatory to The Broad and La Brea Tar Pits & Museum, there's plenty to keep you busy.

  • Around 95 miles south of Ontario, San Diego is another essential stop in United States. Start your sightseeing at San Diego Zoo, USS Midway Museum and SeaWorld San Diego.

Prices shown on this page are estimated lowest prices only. Found in the last 45 days.