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Cheap flights from Portland, Maine to Los Angeles from $165

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 6/11. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
0 bags

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Find the cheapest flights from Portland, Maine to Los Angeles

Cheap round-trip flights

Enter your travel dates to find the best prices.
JetBlue Logo
2:25 pm - 10:40 pm
PWM
-
ONT
11h 15m
1 stop
JetBlue Logo
11:59 pm - 1:29 pm
ONT
-
PWM
10h 30m
1 stop
$329JetBlue
Thu, Jun 11 - Tue, Jun 16
American Airlines Logo
1:18 pm - 8:27 pm
PWM
-
ONT
10h 09m
1 stop
American Airlines Logo
6:15 am - 10:13 pm
ONT
-
PWM
12h 58m
2 stops
$364American Airlines
Tue, May 5 - Tue, May 19
American Airlines Logo
1:18 pm - 10:36 pm
PWM
-
ONT
12h 18m
2 stops
American Airlines Logo
6:15 am - 10:13 pm
ONT
-
PWM
12h 58m
2 stops
$370American Airlines
Tue, May 5 - Tue, May 19
American Airlines Logo
1:18 pm - 8:27 pm
PWM
-
ONT
10h 09m
1 stop
American Airlines Logo
6:15 am - 10:13 pm
ONT
-
PWM
12h 58m
2 stops
$380American Airlines
Tue, May 5 - Tue, May 19
American Airlines Logo
7:10 am - 4:22 pm
PWM
-
ONT
12h 12m
2 stops
American Airlines Logo
6:15 am - 10:13 pm
ONT
-
PWM
12h 58m
2 stops
$385American Airlines
Tue, May 5 - Tue, May 19
American Airlines Logo
1:18 pm - 8:27 pm
PWM
-
ONT
10h 09m
1 stop
American Airlines Logo
10:26 pm - 11:15 am
ONT
-
PWM
9h 49m
1 stop
$440American Airlines
Tue, May 5 - Tue, May 19
American Airlines Logo
1:18 pm - 8:27 pm
PWM
-
ONT
10h 09m
1 stop
American Airlines Logo
10:26 pm - 11:15 am
ONT
-
PWM
9h 49m
1 stop
$446American Airlines
Tue, May 5 - Tue, May 19
Delta Logo
1:35 pm - 9:56 pm
PWM
-
ONT
11h 21m
1 stop
Delta Logo
10:59 pm - 12:22 pm
ONT
-
PWM
10h 23m
1 stop
$449Delta
Tue, Aug 25 - Mon, Aug 31
JetBlue Logo
2:25 pm - 10:40 pm
PWM
-
ONT
11h 15m
1 stop
JetBlue Logo
11:59 pm - 1:29 pm
ONT
-
PWM
10h 30m
1 stop
$452JetBlue
Wed, Jun 17 - Mon, Jun 22
Delta Logo
6:00 am - 6:01 pm
PWM
-
ONT
15h 01m
2 stops
Delta Logo
10:59 pm - 12:22 pm
ONT
-
PWM
10h 23m
1 stop
$454Delta
Thu, Aug 20 - Sun, Aug 23

Delta flights from Portland, Maine to Ontario

Our best Delta deals on Portland, Maine to Ontario flight tickets
Delta
Aug 25
PWM1:35 pmPortland
11h 21m
1 stop
ONT9:56 pmOntario
Aug 31
ONT10:59 pmOntario
10h 23m
1 stop
PWM12:22 pmPortland
$449
Delta
Aug 20
PWM6:00 amPortland
15h 01m
2 stops
ONT6:01 pmOntario
Aug 23
ONT10:59 pmOntario
10h 23m
1 stop
PWM12:22 pmPortland
$454
Delta
Apr 25
PWM1:12 pmPortland
10h 48m
1 stop
ONT9:00 pmOntario
May 2
ONT12:49 pmOntario
7h 34m
1 stop
PWM11:23 pmPortland
$459

United Airlines flights from Portland, Maine to Ontario

Our best United Airlines deals on Portland, Maine to Ontario flight tickets
United Airlines
May 5
PWM3:23 pmPortland
8h 13m
1 stop
ONT8:36 pmOntario
May 9
ONT5:00 amOntario
7h 41m
1 stop
PWM3:41 pmPortland
$469
United Airlines
May 9
PWM9:40 amPortland
11h 21m
1 stop
ONT6:01 pmOntario
May 12
ONT7:00 amOntario
13h 59m
2 stops
PWM11:59 pmPortland
$474
United Airlines
May 5
PWM4:50 pmPortland
8h 45m
1 stop
ONT10:35 pmOntario
May 9
ONT5:00 amOntario
7h 41m
1 stop
PWM3:41 pmPortland
$478

momondo Fare Finder

 
Customize your flight search to find flights from Portland, Maine to Ontario that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, momondo users made 832,500 searches. Data last updated March 24, 2026.
Use the filters below to find and compare flights from Portland, Maine to Ontario that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

PortlandOntario

PWM - ONT

PWMONT

Portland

Thu 6/11

2:25 pm-10:40 pm

1 stop11h 15m

Ontario

Tue 6/16

11:59 pm-1:29 pm

1 stop10h 30m

$329

PortlandOntario

PWM - ONT

PWMONT

Portland

Tue 5/5

1:18 pm-8:27 pm

1 stop10h 09m

Ontario

Tue 5/19

6:15 am-10:13 pm

2 stops12h 58m

$364

PortlandOntario

PWM - ONT

PWMONT

Portland

Tue 5/5

1:18 pm-10:36 pm

2 stops12h 18m

Ontario

Tue 5/19

6:15 am-10:13 pm

2 stops12h 58m

$370

PortlandOntario

PWM - ONT

PWMONT

Portland

Tue 5/5

1:18 pm-8:27 pm

1 stop10h 09m

Ontario

Tue 5/19

6:15 am-10:13 pm

2 stops12h 58m

$380

PortlandOntario

PWM - ONT

PWMONT

Portland

Tue 5/5

7:10 am-4:22 pm

2 stops12h 12m

Ontario

Tue 5/19

6:15 am-10:13 pm

2 stops12h 58m

$385
Quickest round-trip

PortlandOntario

PWM - ONT

PWMONT

Portland

Tue 5/5

1:18 pm-8:27 pm

1 stop10h 09m

Ontario

Tue 5/19

10:26 pm-11:15 am

1 stop9h 49m

$440

PortlandOntario

PWM - ONT

PWMONT

Portland

Tue 5/5

1:18 pm-8:27 pm

1 stop10h 09m

Ontario

Tue 5/19

10:26 pm-11:15 am

1 stop9h 49m

$446

PortlandOntario

PWM - ONT

PWMONT

Portland

Tue 8/25

1:35 pm-9:56 pm

1 stop11h 21m

Ontario

Mon 8/31

10:59 pm-12:22 pm

1 stop10h 23m

$449

PortlandOntario

PWM - ONT

PWMONT

Portland

Wed 6/17

2:25 pm-10:40 pm

1 stop11h 15m

Ontario

Mon 6/22

11:59 pm-1:29 pm

1 stop10h 30m

$452

PortlandOntario

PWM - ONT

PWMONT

Portland

Thu 8/20

6:00 am-6:01 pm

2 stops15h 01m

Ontario

Sun 8/23

10:59 pm-12:22 pm

1 stop10h 23m

$454

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to Los Angeles from

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

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

You could potentially save up to 43% 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 11m

Direct flights

None
The fastest flight from Portland, Maine to Ontario takes 8h 11m
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 11m, 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?

  • 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?

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
DeltaPriceFrom $196Free CancellationRating
7.9
8,320 reviews
Search Delta flights
American AirlinesPriceFrom $279Free CancellationRating
7.1
11,491 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.

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