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Cheap flights from Portland, Maine to Los Angeles from $130

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 5/29. 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.
Delta Logo
5:31 am - 12:02 pm
PWM
-
ONT
9h 31m
1 stop
Delta Logo
12:57 pm - 11:22 pm
ONT
-
PWM
7h 25m
1 stop
$374Delta
Fri, Mar 6 - Thu, Mar 12
Delta Logo
5:31 am - 12:02 pm
PWM
-
ONT
9h 31m
1 stop
Delta Logo
10:25 pm - 4:06 pm
ONT
-
PWM
14h 41m
2 stops
$379Delta
Fri, Mar 6 - Mon, Mar 9
United Airlines Logo
11:30 am - 10:18 pm
PWM
-
ONT
13h 48m
2 stops
United Airlines Logo
11:59 pm - 2:32 pm
ONT
-
PWM
11h 33m
2 stops
$385United Airlines
Thu, Mar 5 - Mon, Mar 9
United Airlines Logo
4:23 pm - 10:26 pm
PWM
-
ONT
9h 03m
1 stop
United Airlines Logo
5:00 am - 3:41 pm
ONT
-
PWM
7h 41m
1 stop
$389United Airlines
Sat, Apr 25 - Sat, May 2
United Airlines Logo
4:23 pm - 10:26 pm
PWM
-
ONT
9h 03m
1 stop
United Airlines Logo
6:59 pm - 10:18 am
ONT
-
PWM
12h 19m
2 stops
$394United Airlines
Sat, Apr 25 - Sat, May 2
United Airlines Logo
6:04 am - 12:38 pm
PWM
-
ONT
9h 34m
2 stops
United Airlines Logo
7:00 am - 11:29 pm
ONT
-
PWM
13h 29m
2 stops
$399United Airlines
Sat, Apr 25 - Sat, May 2
American Airlines Logo
12:29 pm - 10:07 pm
PWM
-
ONT
12h 38m
2 stops
American Airlines Logo
7:59 pm - 10:28 am
ONT
-
PWM
11h 29m
2 stops
$406American Airlines
Fri, Mar 6 - Mon, Mar 9
Southwest Logo
5:30 am - 2:05 pm
PWM
-
ONT
11h 35m
1 stop
Southwest Logo
9:55 pm - 11:55 am
ONT
-
PWM
11h 00m
1 stop
$409Southwest
Thu, Mar 5 - Mon, Mar 9
Delta Logo
2:35 pm - 10:37 pm
PWM
-
ONT
35h 02m
2 stops
Delta Logo
10:25 pm - 11:04 am
ONT
-
PWM
9h 39m
2 stops
$416Delta
Mon, Mar 2 - Mon, Mar 9
Southwest Logo
5:35 am - 5:35 pm
PWM
-
ONT
15h 00m
2 stops
Southwest Logo
9:55 pm - 11:55 am
ONT
-
PWM
11h 00m
1 stop
$420Southwest
Mon, Mar 2 - Mon, Mar 9

Southwest flights from Portland, Maine to Ontario

Our best Southwest deals on Portland, Maine to Ontario flight tickets
Southwest
Mar 5
PWM5:30 amPortland
11h 35m
1 stop
ONT2:05 pmOntario
Mar 9
ONT9:55 pmOntario
11h 00m
1 stop
PWM11:55 amPortland
$409
Southwest
Mar 2
PWM5:35 amPortland
15h 00m
2 stops
ONT5:35 pmOntario
Mar 9
ONT9:55 pmOntario
11h 00m
1 stop
PWM11:55 amPortland
$420
Southwest
Mar 6
PWM5:30 amPortland
11h 35m
1 stop
ONT2:05 pmOntario
Mar 12
ONT11:55 pmOntario
9h 00m
2 stops
PWM11:55 amPortland
$424

Delta flights from Portland, Maine to Ontario

Our best Delta deals on Portland, Maine to Ontario flight tickets
Delta
Mar 6
PWM5:31 amPortland
9h 31m
1 stop
ONT12:02 pmOntario
Mar 12
ONT12:57 pmOntario
7h 25m
1 stop
PWM11:22 pmPortland
$374
Delta
Mar 6
PWM5:31 amPortland
9h 31m
1 stop
ONT12:02 pmOntario
Mar 9
ONT10:25 pmOntario
14h 41m
2 stops
PWM4:06 pmPortland
$379
Delta
Mar 2
PWM2:35 pmPortland
35h 02m
2 stops
ONT10:37 pmOntario
Mar 9
ONT10:25 pmOntario
9h 39m
2 stops
PWM11:04 amPortland
$416

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 February 5, 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

PortlandOntario

PWM - ONT

PWMONT

Portland

Fri 3/6

5:31 am-12:02 pm

1 stop9h 31m

Ontario

Thu 3/12

12:57 pm-11:22 pm

1 stop7h 25m

$374

PortlandOntario

PWM - ONT

PWMONT

Portland

Fri 3/6

5:31 am-12:02 pm

1 stop9h 31m

Ontario

Mon 3/9

10:25 pm-4:06 pm

2 stops14h 41m

$379

PortlandOntario

PWM - ONT

PWMONT

Portland

Thu 3/5

11:30 am-10:18 pm

2 stops13h 48m

Ontario

Mon 3/9

11:59 pm-2:32 pm

2 stops11h 33m

$385

PortlandOntario

PWM - ONT

PWMONT

Portland

Sat 4/25

4:23 pm-10:26 pm

1 stop9h 03m

Ontario

Sat 5/2

5:00 am-3:41 pm

1 stop7h 41m

$389

PortlandOntario

PWM - ONT

PWMONT

Portland

Sat 4/25

4:23 pm-10:26 pm

1 stop9h 03m

Ontario

Sat 5/2

6:59 pm-10:18 am

2 stops12h 19m

$394

PortlandOntario

PWM - ONT

PWMONT

Portland

Sat 4/25

6:04 am-12:38 pm

2 stops9h 34m

Ontario

Sat 5/2

7:00 am-11:29 pm

2 stops13h 29m

$399

PortlandOntario

PWM - ONT

PWMONT

Portland

Fri 3/6

12:29 pm-10:07 pm

2 stops12h 38m

Ontario

Mon 3/9

7:59 pm-10:28 am

2 stops11h 29m

$406

PortlandOntario

PWM - ONT

PWMONT

Portland

Thu 3/5

5:30 am-2:05 pm

1 stop11h 35m

Ontario

Mon 3/9

9:55 pm-11:55 am

1 stop11h 00m

$409

PortlandOntario

PWM - ONT

PWMONT

Portland

Mon 3/2

2:35 pm-10:37 pm

2 stops35h 02m

Ontario

Mon 3/9

10:25 pm-11:04 am

2 stops9h 39m

$416

PortlandOntario

PWM - ONT

PWMONT

Portland

Mon 3/2

5:35 am-5:35 pm

2 stops15h 00m

Ontario

Mon 3/9

9:55 pm-11:55 am

1 stop11h 00m

$420

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 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

Fastest flight time

7h 42m

Direct flights

None
The fastest flight from Portland, Maine to Ontario takes 7h 42m
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 7h 42m, 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 $259Free CancellationRating
7.9
8,151 reviews
Search Delta flights
American AirlinesPriceFrom $279Free CancellationRating
7.2
11,237 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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