What airlines fly to Ontario?

JetBlue, Delta and United Airlines are the top three most popular airlines that fly to Ontario from Portland, Maine according to our data. JetBlue is the first choice among our users, with 42% 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 Portland to Ontario?

United Airlines is the most popular carrier operating from Portland to Ontario

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

Prices for flights from Portland Airport to Ontario Airport are refreshed on a daily basis.

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

There are 2 operators available for flights from Portland Airport to Ontario Airport as of December 2025.

How old do you have to be to fly from Portland 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 Portland Airport to Ontario Airport.

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

The necessary travel and health documents for your Ontario Airport trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

$149 Cheap Flights from Portland to Ontario in 2025/26

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Find the cheapest flights from Portland, Maine to Los Angeles

Round-trip

One-way

Last minute

Cheap round-trip flights

Enter your travel dates to find the best prices.

2:18 pm - 10:09 pm

PWM

ONT

10h 51m1 stop

11:25 pm - 1:23 pm

ONT

PWM

10h 58m1 stop

$366JetBlue

Wed, Apr 29 - Mon, May 4

8:35 am - 10:53 pm

PWM

ONT

17h 18m2 stops

6:00 am - 11:30 pm

ONT

PWM

14h 30m2 stops

$384United Airlines

Sun, Jan 18 - Wed, Jan 21

5:45 am - 2:45 pm

PWM

ONT

12h 00m2 stops

9:45 am - 10:45 pm

ONT

PWM

10h 00m2 stops

$399Southwest

Tue, Jan 6 - Thu, Jan 15

2:18 pm - 10:09 pm

PWM

ONT

10h 51m1 stop

11:25 pm - 1:23 pm

ONT

PWM

10h 58m1 stop

$428JetBlue

Fri, May 1 - Sun, May 17

11:12 am - 8:58 pm

PWM

ONT

12h 46m2 stops

5:05 am - 6:54 pm

ONT

PWM

10h 49m2 stops

$519United Airlines

Tue, Feb 3 - Sat, Feb 7

11:12 am - 8:58 pm

PWM

ONT

12h 46m2 stops

5:05 am - 2:31 pm

ONT

PWM

30h 26m3 stops

$647United Airlines

Tue, Feb 3 - Sat, Feb 7

4:23 pm - 10:26 pm

PWM

ONT

9h 03m1 stop

6:00 am - 10:58 pm

ONT

PWM

13h 58m2 stops

$668United Airlines

Wed, Apr 15 - Mon, Apr 20

4:23 pm - 10:26 pm

PWM

ONT

9h 03m1 stop

6:00 am - 10:58 pm

ONT

PWM

13h 58m2 stops

$717United Airlines

Sat, Apr 11 - Sat, Apr 18

5:30 am - 2:50 pm

PWM

ONT

12h 20m2 stops

10:10 am - 12:05 am

ONT

PWM

10h 55m2 stops

$733Southwest

Thu, Jan 1 - Fri, Jan 2

5:30 am - 2:50 pm

PWM

ONT

12h 20m2 stops

9:30 am - 12:05 am

ONT

PWM

11h 35m1 stop

$734Southwest

Thu, Jan 1 - Fri, Jan 2

United Airlines flights from Portland, Maine to Ontario

Our best United Airlines deals on Portland, Maine to Ontario flight tickets

United Airlines

Jan 18

PWM8:35 amPortland

17h 18m

2 stops

ONT10:53 pmOntario

Jan 21

ONT6:00 amOntario

14h 30m

2 stops

PWM11:30 pmPortland

$384

Find similar

United Airlines

Feb 3

PWM11:12 amPortland

12h 46m

2 stops

ONT8:58 pmOntario

Feb 7

ONT5:05 amOntario

10h 49m

2 stops

PWM6:54 pmPortland

$519

Find similar

United Airlines

Feb 3

PWM11:12 amPortland

12h 46m

2 stops

ONT8:58 pmOntario

Feb 7

ONT5:05 amOntario

30h 26m

3 stops

PWM2:31 pmPortland

$647

Find similar

JetBlue flights from Portland, Maine to Ontario

Our best JetBlue deals on Portland, Maine to Ontario flight tickets

JetBlue

Apr 29

PWM2:18 pmPortland

10h 51m

1 stop

ONT10:09 pmOntario

May 4

ONT11:25 pmOntario

10h 58m

1 stop

PWM1:23 pmPortland

$366

Find similar

JetBlue

May 1

PWM2:18 pmPortland

10h 51m

1 stop

ONT10:09 pmOntario

May 17

ONT11:25 pmOntario

10h 58m

1 stop

PWM1:23 pmPortland

$428

Find similar

Fly from

Fly to

Route

Depart

Return

Price

PortlandOntario

PWM - ONT

PWMONT

Portland

Wed 4/29

2:18 pm-10:09 pm

1 stop10h 51m

Ontario

Mon 5/4

11:25 pm-1:23 pm

1 stop10h 58m

$366

PortlandOntario

PWM - ONT

PWMONT

Portland

Sun 1/18

8:35 am-10:53 pm

2 stops17h 18m

Ontario

Wed 1/21

6:00 am-11:30 pm

2 stops14h 30m

$384

PortlandOntario

PWM - ONT

PWMONT

Portland

Tue 1/6

5:45 am-2:45 pm

2 stops12h 00m

Ontario

Thu 1/15

9:45 am-10:45 pm

2 stops10h 00m

$399

PortlandOntario

PWM - ONT

PWMONT

Portland

Fri 5/1

2:18 pm-10:09 pm

1 stop10h 51m

Ontario

Sun 5/17

11:25 pm-1:23 pm

1 stop10h 58m

$428

PortlandOntario

PWM - ONT

PWMONT

Portland

Tue 2/3

11:12 am-8:58 pm

2 stops12h 46m

Ontario

Sat 2/7

5:05 am-6:54 pm

2 stops10h 49m

$519

PortlandOntario

PWM - ONT

PWMONT

Portland

Tue 2/3

11:12 am-8:58 pm

2 stops12h 46m

Ontario

Sat 2/7

5:05 am-2:31 pm

3 stops30h 26m

$647

PortlandOntario

PWM - ONT

PWMONT

Portland

Wed 4/15

4:23 pm-10:26 pm

1 stop9h 03m

Ontario

Mon 4/20

6:00 am-10:58 pm

2 stops13h 58m

$668

PortlandOntario

PWM - ONT

PWMONT

Portland

Sat 4/11

4:23 pm-10:26 pm

1 stop9h 03m

Ontario

Sat 4/18

6:00 am-10:58 pm

2 stops13h 58m

$717

PortlandOntario

PWM - ONT

PWMONT

Portland

Thu 1/1

5:30 am-2:50 pm

2 stops12h 20m

Ontario

Fri 1/2

10:10 am-12:05 am

2 stops10h 55m

$733

PortlandOntario

PWM - ONT

PWMONT

Portland

Thu 1/1

5:30 am-2:50 pm

2 stops12h 20m

Ontario

Fri 1/2

9:30 am-12:05 am

1 stop11h 35m

$734

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first

How to get the cheapest flight ticket from Portland, Maine 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 day to depart on your flight to Ontario?

The cheapest day to depart on your flight to Ontario is on a Tuesday when prices can be found for as low as $401. This is often the case because there is less demand to fly during this day of the week. When flying out on a Sunday, the most expensive travel day of the week, you can expect to see flight prices from Portland, Maine to Ontario for around $569.

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

At noon is the cheapest time of day to fly from Portland, Maine to Ontario when you can find flight prices for as low as $428. Flying to Ontario at noon 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 evening when prices are $552 on average. Flights to Ontario from Portland, Maine in the evening are generally more expensive because this time of day is more convenient for travelers’ schedules.

Can stopping save me money on Portland, Maine to Ontario flights?

You could potentially save up to 35% on your flight if you consider stops on a Portland, Maine to Ontario flight.

When to book flights from Portland, Maine to Ontario

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

Estimated round-trip price

Cheap Portland, Maine to Ontario (PWM to ONT) flight deals and tips

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

Fastest flight time	8h 25m
Direct flights	None

The fastest flight from Portland, Maine to Ontario takes 8h 25m

There are no direct flights from Portland, Maine to Ontario. There are no popular flight routes from Portland, Maine to Ontario.

Search flight deals

How far is Portland to Ontario by plane?
Portland and Ontario are 2595.5 mi apart from one another. Flights usually cover this in 8h 25m, depending on flying conditions and air traffic around both airports.
When did momondo last update prices for flights from Portland Airport to Ontario Airport?
Prices for flights from Portland Airport to Ontario Airport are refreshed on a daily basis.
How many operators does momondo search for flights from Portland Airport to Ontario Airport?
There are 2 operators available for flights from Portland Airport to Ontario Airport as of December 2025.
How old do you have to be to fly from Portland 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 Portland Airport to Ontario Airport.
What documentation or ID do you need to fly to Ontario Airport?
The necessary travel and health documents for your Ontario Airport trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.
What is the most popular airline from Portland, Maine to Ontario?
momondo data reveals that the most frequently booked airline on the route from Portland, Maine to Ontario is Delta, representing 61% of all bookings. The subsequent popular airline is American Airlines at 39%.

Best airlines flying from Portland, Maine to Ontario

Compare and see reviews for airlines that fly from Portland, Maine to Ontario with momondo

Airline	Rating	Free Cancellation	Price
Delta	PriceFrom $259	Free Cancellation	Rating 7.9 8,007 reviews		Search Delta flights
American Airlines	PriceFrom $279	Free Cancellation	Rating 7.2 11,052 reviews		Search American Airlines flights

Why use momondo?

Why should I use momondo to find a flight deal from Portland 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 Portland to Ontario for you.

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

momondo does allow users to show only those flights to Ontario from Portland which offer a flexible booking policy as well as other useful filters and features.

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

Once you have performed a search in the form on the page, momondo provides useful filters and insights. We can show you the cheapest days and times to fly as well as help filter your options to help you make an informed choice when booking flights to Ontario from Portland.

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

If you are not ready to book a flight from Portland to Ontario now, use our insights above to find helpful tips or alternatively set up a price alert, where momondo will track prices on flights to Ontario and let you know when they change.