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

Delta, United Airlines, and Southwest are the most popular carriers operating from Portland to Ontario

What airlines fly to Ontario?

JetBlue, United Airlines and American 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 41% of people opting to fly with this airline when traveling to Ontario. Keep in mind that there are 9 different airlines that fly to Ontario on a routine basis, so you have a few additional options to choose from.

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 August 2026.

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.

$158 Cheap Flights from Portland, Maine to Ontario in 2026

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from Portland, Maine to Los Angeles

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6:00 am - 11:09 amPWM Portland-ONT Ontario

8h 09m1 stop Atlanta Hartsfield-Jackson

12:16 pm - 11:35 pmONT Ontario-PWM Portland

8h 19m1 stop Atlanta Hartsfield-Jackson

$359Delta

Wed, Sep 30 - Tue, Oct 27

6:00 am - 11:09 amPWM Portland-ONT Ontario

8h 09m1 stop Atlanta Hartsfield-Jackson

12:16 pm - 11:35 pmONT Ontario-PWM Portland

8h 19m1 stop Atlanta Hartsfield-Jackson

$359Delta

Wed, Sep 23 - Fri, Oct 23

6:00 am - 11:09 amPWM Portland-ONT Ontario

8h 09m1 stop Atlanta Hartsfield-Jackson

12:16 pm - 11:35 pmONT Ontario-PWM Portland

8h 19m1 stop Atlanta Hartsfield-Jackson

$359Delta

Wed, Sep 23 - Tue, Oct 27

4:23 pm - 10:59 pmPWM Portland-ONT Ontario

9h 36m1 stop Charlotte Douglas

11:59 pm - 2:32 pmONT Ontario-PWM Portland

11h 33m2 stops Dallas/Fort Worth Washington, D.C. Reagan-National

$364American Airlines

Fri, Oct 30 - Fri, Nov 6

3:23 pm - 8:51 pmPWM Portland-ONT Ontario

8h 28m1 stop Denver Intl

5:00 am - 4:02 pmONT Ontario-PWM Portland

8h 02m1 stop Denver Intl

$367United Airlines

Wed, Nov 4 - Wed, Nov 11

3:25 pm - 10:15 pmPWM Portland-ONT Ontario

9h 50m2 stops Baltimore/Washington Denver Intl

11:55 pm - 2:45 pmONT Ontario-PWM Portland

11h 50m2 stops Chicago Midway Baltimore/Washington

$369Southwest

Fri, Oct 30 - Fri, Nov 6

5:30 am - 1:25 pmPWM Portland-ONT Ontario

10h 55m2 stops Philadelphia Dallas/Fort Worth

7:11 pm - 1:05 pmONT Ontario-PWM Portland

14h 54m2 stops Phoenix Sky Harbor Intl Chicago O'Hare Intl

$370American Airlines

Wed, Sep 23 - Sun, Sep 27

12:46 pm - 10:45 pmPWM Portland-ONT Ontario

12h 59m2 stops Washington, D.C. Reagan-National Dallas/Fort Worth

6:27 am - 10:07 pmONT Ontario-PWM Portland

12h 40m2 stops Phoenix Sky Harbor Intl Charlotte Douglas

$370American Airlines

Mon, Jan 25 - Sat, Jan 30

12:50 pm - 11:58 pmPWM Portland-ONT Ontario

14h 08m2 stops Detroit Metropolitan Wayne County Salt Lake City

6:00 am - 10:23 pmONT Ontario-PWM Portland

13h 23m2 stops Salt Lake City Atlanta Hartsfield-Jackson

$370Delta

Wed, Dec 16 - Wed, Jan 6

8:47 am - 6:01 pmPWM Portland-ONT Ontario

12h 14m2 stops Chicago O'Hare Intl San Francisco

5:00 am - 4:02 pmONT Ontario-PWM Portland

8h 02m1 stop Denver Intl

$372United Airlines

Wed, Nov 4 - Wed, Nov 11

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Delta flights from Portland, Maine to Ontario

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

Delta

Sep 23

PWM6:00 amPortland

8h 09m

1 stop

ONT11:09 amOntario

Oct 23

ONT12:16 pmOntario

8h 19m

1 stop

PWM11:35 pmPortland

$359

Delta

Sep 23

PWM6:00 amPortland

8h 09m

1 stop

ONT11:09 amOntario

Oct 21

ONT12:16 pmOntario

8h 19m

1 stop

PWM11:35 pmPortland

$406

Delta

Sep 30

PWM6:00 amPortland

8h 09m

1 stop

ONT11:09 amOntario

Oct 22

ONT12:16 pmOntario

8h 19m

1 stop

PWM11:35 pmPortland

$449

United Airlines flights from Portland, Maine to Ontario

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

United Airlines

Nov 4

PWM3:23 pmPortland

8h 28m

1 stop

ONT8:51 pmOntario

Nov 11

ONT5:00 amOntario

8h 02m

1 stop

PWM4:02 pmPortland

$367

United Airlines

Nov 4

PWM8:47 amPortland

12h 14m

2 stops

ONT6:01 pmOntario

Nov 11

ONT5:00 amOntario

8h 02m

1 stop

PWM4:02 pmPortland

$372

United Airlines

Sep 5

PWM5:03 pmPortland

8h 32m

1 stop

ONT10:35 pmOntario

Sep 9

ONT5:00 amOntario

7h 51m

1 stop

PWM3:51 pmPortland

$375

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

Quickest round-trip

PortlandOntario

PWM Portland - ONT Ontario

PWMONT

Portland

Wed 9/30

6:00 am-11:09 am

1 stop8h 09m

Ontario

Tue 10/27

12:16 pm-11:35 pm

1 stop8h 19m

$359

PortlandOntario

PWM Portland - ONT Ontario

PWMONT

Portland

Wed 9/23

6:00 am-11:09 am

1 stop8h 09m

Ontario

Fri 10/23

12:16 pm-11:35 pm

1 stop8h 19m

$359

PortlandOntario

PWM Portland - ONT Ontario

PWMONT

Portland

Wed 9/23

6:00 am-11:09 am

1 stop8h 09m

Ontario

Tue 10/27

12:16 pm-11:35 pm

1 stop8h 19m

$359

PortlandOntario

PWM Portland - ONT Ontario

PWMONT

Portland

Fri 10/30

4:23 pm-10:59 pm

1 stop9h 36m

Ontario

Fri 11/6

11:59 pm-2:32 pm

2 stops11h 33m

$364

PortlandOntario

PWM Portland - ONT Ontario

PWMONT

Portland

Wed 11/4

3:23 pm-8:51 pm

1 stop8h 28m

Ontario

Wed 11/11

5:00 am-4:02 pm

1 stop8h 02m

$367

PortlandOntario

PWM Portland - ONT Ontario

PWMONT

Portland

Fri 10/30

3:25 pm-10:15 pm

2 stops9h 50m

Ontario

Fri 11/6

11:55 pm-2:45 pm

2 stops11h 50m

$369

PortlandOntario

PWM Portland - ONT Ontario

PWMONT

Portland

Wed 9/23

5:30 am-1:25 pm

2 stops10h 55m

Ontario

Sun 9/27

7:11 pm-1:05 pm

2 stops14h 54m

$370

PortlandOntario

PWM Portland - ONT Ontario

PWMONT

Portland

Mon 1/25

12:46 pm-10:45 pm

2 stops12h 59m

Ontario

Sat 1/30

6:27 am-10:07 pm

2 stops12h 40m

$370

PortlandOntario

PWM Portland - ONT Ontario

PWMONT

Portland

Wed 12/16

12:50 pm-11:58 pm

2 stops14h 08m

Ontario

Wed 1/6

6:00 am-10:23 pm

2 stops13h 23m

$370

PortlandOntario

PWM Portland - ONT Ontario

PWMONT

Portland

Wed 11/4

8:47 am-6:01 pm

2 stops12h 14m

Ontario

Wed 11/11

5:00 am-4:02 pm

1 stop8h 02m

$372

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 typical price of a round-trip flight between Portland, Maine and Ontario?

Prices are currently low for flights on this route.

Typical prices usually range from $382 to $719.
The lowest price recently found on this route was $359.

What is the cheapest month to fly to Ontario?

In general, November is the cheapest month to fly from Portland, Maine to Ontario. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $0. If you aren’t able to travel during the month of November, then book flights to Ontario from Portland, Maine during January instead. Flights to Ontario in January, while not as cheap as those in November, still average around $0.

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

You could potentially save up to 4% 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

Best Price Found	$158
Fastest flight time	8h 28m
Direct flights	None

The best one-way flight to Ontario from Portland, Maine in the past 72 hours is $158. The best round-trip flight deal from Portland, Maine to Ontario found on momondo in the last 72 hours is $359.

The fastest flight from Portland, Maine to Ontario takes 8h 28m

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

Search flight deals

Frequently asked questions about flying from Portland, Maine to Ontario

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 28m, 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 August 2026.
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 American Airlines, representing 52% of all bookings. The subsequent popular airline is Delta at 48%.

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 $302	Free Cancellation	Rating 7.8 8,500 reviews		Search Delta flights
American Airlines	PriceFrom $360	Free Cancellation	Rating 7.1 11,962 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.

An easier way to manage your Ontario trip

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Cheap flights from Portland, Maine to Los Angeles from $158

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Portland, Maine to Los Angeles departing on 9/23. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.

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Delta flights from Portland, Maine to Ontario

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

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

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How to get the cheapest flight ticket from Portland, Maine to Ontario

What is the typical price of a round-trip flight between Portland, Maine and Ontario?

What is the cheapest month to fly to Ontario?

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

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

What airlines fly to Ontario?

When to book flights from Portland, Maine to Ontario

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

Best Price Found

Fastest flight time

Direct flights

Frequently asked questions about flying from Portland, Maine to Ontario

Best airlines flying from Portland, Maine to Ontario

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

Why use momondo?

An easier way to manage your Ontario trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.

Find better results for your trip to the United States

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Fly your favorite airline to Los Angeles

Airlines are sorted and displayed according to clicks in the past 7 days on momondo

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List of cabin classes available on flights landing in Los Angeles. Availability may vary depending on flight origin and airline.

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