What airlines fly to Ontario?

American Airlines, United Airlines and Spirit Airlines are the top three most popular airlines that fly to Ontario from Philadelphia according to our data. American Airlines is the first choice among our users, with 33% of people opting to fly with this airline when traveling to Ontario. Keep in mind that there are 10 different airlines that fly to Ontario on a routine basis, so you have a few additional options to choose from.

What is the cheapest airline that flies from Philadelphia to Ontario?

Frontier, Delta, and Hawaiian Airlines are the most popular carriers operating from Philadelphia to Ontario

When did momondo last update prices for flights from Philadelphia Airport to Ontario Airport?

Prices for flights from Philadelphia Airport to Ontario Airport refresh daily.

How many operators does momondo search for flights from Philadelphia Airport to Ontario Airport?

As of July 2025, there are 6 operators available to choose from for flights from Philadelphia Airport to Ontario Airport.

How old do you have to be to fly from Philadelphia Airport to Ontario Airport?

Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Philadelphia Airport to Ontario Airport.

What documentation or ID do you need to fly to Ontario Airport?

The required travel and health documents for your Ontario Airport trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Ontario Airport. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

$89 Cheap Flights from Philadelphia to Ontario in 2025

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Find the cheapest flights from Philadelphia to Los Angeles

Round-trip

One-way

Last minute

Cheap round-trip flights

7:19 am - 4:19 pmPHL-ONT

12h 00m1 stop

5:14 pm - 5:49 amONT-PHL

9h 35m1 stop

$218Frontier

Find Deal

Sun, Aug 10 - Sun, Aug 17

7:19 am - 11:53 amPHL-ONT

7h 34m1 stop

5:14 pm - 5:49 amONT-PHL

9h 35m1 stop

$235Frontier

Find Deal

Mon, Aug 11 - Thu, Aug 14

7:19 am - 11:53 amPHL-ONT

7h 34m1 stop

5:14 pm - 5:49 amONT-PHL

9h 35m1 stop

$238Frontier

Find Deal

Fri, Aug 8 - Sun, Aug 10

7:19 am - 11:53 amPHL-ONT

7h 34m1 stop

7:22 pm - 5:49 amONT-PHL

7h 27m1 stop

$239Frontier

Find Deal

Mon, Aug 11 - Wed, Aug 13

7:19 am - 4:19 pmPHL-ONT

12h 00m1 stop

5:13 pm - 5:56 amONT-PHL

9h 43m1 stop

$241Frontier

Find Deal

Thu, Aug 14 - Sat, Aug 16

7:19 am - 8:52 pmPHL-ONT

16h 33m1 stop

5:14 pm - 5:49 amONT-PHL

9h 35m1 stop

$242Frontier

Find Deal

Mon, Aug 11 - Thu, Aug 14

7:19 am - 8:52 pmPHL-ONT

16h 33m1 stop

6:00 am - 5:49 amONT-PHL

20h 49m1 stop

$246Frontier

Find Deal

Mon, Aug 11 - Fri, Aug 15

7:19 am - 11:53 amPHL-ONT

7h 34m1 stop

5:21 pm - 5:09 amONT-PHL

8h 48m1 stop

$251Frontier

Find Deal

Mon, Aug 11 - Tue, Aug 12

7:19 am - 11:53 amPHL-ONT

7h 34m1 stop

7:22 pm - 5:49 amONT-PHL

7h 27m1 stop

$256Frontier

Find Deal

Mon, Aug 11 - Fri, Aug 15

8:28 am - 7:14 pmPHL-ONT

13h 46m1 stop

6:00 am - 5:27 pmONT-PHL

8h 27m1 stop

$297

Find Deal

Thu, Jul 24 - Fri, Aug 8

Frontier flights from Philadelphia to Ontario

Our best Frontier deals on Philadelphia to Ontario flight tickets

Frontier

Aug 10

PHL7:19 amPhiladelphia

12h 00m

1 stop

ONT4:19 pmOntario

Aug 17

ONT5:14 pmOntario

9h 35m

1 stop

PHL5:49 amPhiladelphia

$218

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Frontier

Jul 19

PHL7:19 amPhiladelphia

12h 01m

1 stop

ONT4:20 pmOntario

Jul 24

ONT5:14 pmOntario

9h 35m

1 stop

PHL5:49 amPhiladelphia

$223

Find similar

Frontier

Aug 11

PHL7:19 amPhiladelphia

7h 34m

1 stop

ONT11:53 amOntario

Aug 14

ONT5:14 pmOntario

9h 35m

1 stop

PHL5:49 amPhiladelphia

$235

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How to get the cheapest flight ticket from Philadelphia to Ontario

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

Prices

Airlines

What is the cheapest month to fly to Ontario?

In general, September is the cheapest month to fly from Philadelphia to Ontario. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $274. If you aren’t able to travel during the month of September, then book flights to Ontario from Philadelphia during March instead. Flights to Ontario in March, while not as cheap as those in September, still average around $342.

What is the cheapest day to depart on your flight to Ontario?

The cheapest day to depart on your flight to Ontario is on a Monday when prices can be found for as low as $330. This is often the case because there is less demand to fly during this day of the week. When flying out on a Saturday, the most expensive travel day of the week, you can expect to see flight prices from Philadelphia to Ontario for around $416.

What is the cheapest time of day to depart on your flight to Ontario?

In the evening is the cheapest time of day to fly from Philadelphia to Ontario when you can find flight prices for as low as $293. Flying to Ontario in the evening is an ideal time because this is during off-peak travel hours. If you have a flexible travel schedule, then try to avoid flying in the afternoon when prices are $386 on average. Flights to Ontario from Philadelphia in the afternoon are generally more expensive because this time of day is more convenient for travelers’ schedules.

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

You are more likely to see cheaper flights to Ontario from Philadelphia when booking weeks ahead of your departure date. In general, you can expect to find flights to Ontario for around $388 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Ontario from Philadelphia for as low as $305 on momondo.

How have Philadelphia to Ontario flight prices changed over time?

As of July 2025, prices for Philadelphia to Ontario flights are approximately 10% more expensive when compared to flights at the same time last year.

When to book flights from Philadelphia to Ontario

Are you open to changing your travel dates? Check out the ideal times to fly from Philadelphia to Ontario according to our flight data. Find out which month and days have the cheapest flights.

Estimated round-trip price

Cheap Philadelphia to Ontario (PHL to ONT) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Philadelphia to Ontario

Best Price Found	$89
Fastest flight time	7h 32m
Direct flights	None
Airports in Ontario	1 airport

The best one-way flight to Ontario from Philadelphia in the past 72 hours is $89. The best round-trip flight deal from Philadelphia to Ontario found on momondo in the last 72 hours is $218.

The fastest flight from Philadelphia to Ontario takes 7h 32m

There are no direct flights from Philadelphia to Ontario. Popular non-direct route for this connection is Philadelphia Airport - Ontario Airport.

There is 1 airport near Ontario: Ontario (ONT)

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How far is Philadelphia to Ontario by plane?
Ontario is 2355.5 mi away from Philadelphia. Flights usually cover this in 7h 34m, depending on flying conditions and air traffic around both airports.
When did momondo last update prices for flights from Philadelphia Airport to Ontario Airport?
Prices for flights from Philadelphia Airport to Ontario Airport refresh daily.
How many operators does momondo search for flights from Philadelphia Airport to Ontario Airport?
As of July 2025, there are 6 operators available to choose from for flights from Philadelphia Airport to Ontario Airport.
How old do you have to be to fly from Philadelphia Airport to Ontario Airport?
Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Philadelphia Airport to Ontario Airport.
What documentation or ID do you need to fly to Ontario Airport?
The required travel and health documents for your Ontario Airport trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Ontario Airport. We recommend that you seek guidance from your airline or a reliable third party such as IATA.
What is the most popular airline from Philadelphia to Ontario?
Based on momondo bookings for this flight route, the most popular airline on flight routes from Philadelphia to Ontario is American Airlines (51% of total bookings). The next most popular airlines are Frontier (24%), Southwest (10%), and Delta (8%).

Best airlines flying from Philadelphia to Ontario

Compare and see reviews for airlines that fly from Philadelphia to Ontario with momondo

Airline	Rating	Free Cancellation	Price
Frontier	PriceFrom $131	Free Cancellation	Rating 5.9 3,261 reviews	Search Frontier flights
Spirit Airlines	PriceFrom $152	Free Cancellation	Rating 6.3 8,046 reviews	Search Spirit Airlines flights
United Airlines	PriceFrom $305	Free Cancellation	Rating 7.4 8,858 reviews	Search United Airlines flights
American Airlines	PriceFrom $306	Free Cancellation	Rating 7.2 10,000 reviews	Search American Airlines flights
Delta	PriceFrom $306	Free Cancellation	Rating 8.0 7,956 reviews	Search Delta flights
Southwest	PriceFrom $338	Free Cancellation	Rating 8.0 4,244 reviews	Search Southwest flights

Why use momondo?

Why should I use momondo to find a flight deal from Philadelphia to Ontario?

We help find the flight that best suits your needs, momondo compares prices from hundreds of airlines and travel agents and helps you filter them to find the best flight from Philadelphia to Ontario for you.

Can I find flights from Philadelphia to Ontario with flexible booking policies on momondo?

All flight searches from Philadelphia to Ontario on momondo can be filtered to show those which offer flexible booking policies.

How can momondo help me find flights from Philadelphia to Ontario?

momondo provides multiple filters to help you find the best flight to Ontario from Philadelphia. Filter by price, airline, airports, cabin, aircraft, payment method, number of stops and more.

I’m not ready to book a flight from Philadelphia to Ontario right now. Can momondo alert me if prices change?

If you are simply researching potential flights to Ontario, momondo offers a useful price alert feature which will track prices for flights to Ontario from Philadelphia and alert you when they change.