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Cheap flights from Portland, Maine to Los Angeles from $174

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 9/15. 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
1 adult, Economy, 0 bags

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
2:45 pm - 10:38 pm
PWM
-
ONT
10h 53m
1 stop
JetBlue Logo
11:59 pm - 12:30 pm
ONT
-
PWM
9h 31m
1 stop
$265JetBlue
Fri, Aug 28 - Mon, Aug 31
JetBlue Logo
2:40 pm - 10:38 pm
PWM
-
ONT
10h 58m
1 stop
JetBlue Logo
11:59 pm - 1:45 pm
ONT
-
PWM
10h 46m
1 stop
$296JetBlue
Thu, Aug 20 - Sun, Aug 23
American Airlines Logo
8:00 am - 1:31 pm
PWM
-
ONT
8h 31m
1 stop
American Airlines Logo
7:05 am - 8:06 pm
ONT
-
PWM
10h 01m
1 stop
$318American Airlines
Thu, Aug 20 - Sun, Aug 23
American Airlines Logo
5:30 am - 1:31 pm
PWM
-
ONT
11h 01m
2 stops
American Airlines Logo
7:05 am - 8:06 pm
ONT
-
PWM
10h 01m
1 stop
$323American Airlines
Thu, Aug 20 - Sun, Aug 23
United Airlines Logo
5:03 pm - 10:35 pm
PWM
-
ONT
8h 32m
1 stop
United Airlines Logo
7:00 am - 5:42 pm
ONT
-
PWM
7h 42m
1 stop
$325United Airlines
Thu, Aug 20 - Tue, Aug 25
JetBlue Logo
2:40 pm - 10:37 pm
PWM
-
ONT
10h 57m
1 stop
JetBlue Logo
11:13 pm - 12:21 pm
ONT
-
PWM
10h 08m
1 stop
$327JetBlue
Wed, Aug 19 - Sat, Sep 5
American Airlines Logo
5:30 am - 3:19 pm
PWM
-
ONT
12h 49m
2 stops
American Airlines Logo
10:29 am - 11:41 pm
ONT
-
PWM
10h 12m
2 stops
$329American Airlines
Thu, Aug 20 - Tue, Aug 25
American Airlines Logo
8:00 am - 1:31 pm
PWM
-
ONT
8h 31m
1 stop
American Airlines Logo
8:01 pm - 10:31 am
ONT
-
PWM
11h 30m
2 stops
$344American Airlines
Wed, Aug 19 - Sun, Aug 23
JetBlue Logo
2:45 pm - 10:38 pm
PWM
-
ONT
10h 53m
1 stop
JetBlue Logo
11:13 pm - 12:30 pm
ONT
-
PWM
10h 17m
1 stop
$346JetBlue
Fri, Aug 28 - Sat, Aug 29
Delta Logo
6:30 am - 9:52 pm
PWM
-
ONT
18h 22m
2 stops
Delta Logo
12:00 pm - 11:13 pm
ONT
-
PWM
8h 13m
1 stop
$354Delta
Thu, Aug 27 - Tue, Sep 1

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American Airlines flights from Portland, Maine to Ontario

Our best American Airlines deals on Portland, Maine to Ontario flight tickets
American Airlines
Aug 20
PWM8:00 amPortland
8h 31m
1 stop
ONT1:31 pmOntario
Aug 23
ONT7:05 amOntario
10h 01m
1 stop
PWM8:06 pmPortland
$318
American Airlines
Aug 20
PWM8:00 amPortland
8h 31m
1 stop
ONT1:31 pmOntario
Aug 23
ONT8:01 pmOntario
13h 39m
2 stops
PWM12:40 pmPortland
$323
American Airlines
Aug 20
PWM5:30 amPortland
12h 49m
2 stops
ONT3:19 pmOntario
Aug 25
ONT10:29 amOntario
10h 12m
2 stops
PWM11:41 pmPortland
$329

United Airlines flights from Portland, Maine to Ontario

Our best United Airlines deals on Portland, Maine to Ontario flight tickets
United Airlines
Aug 20
PWM5:03 pmPortland
8h 32m
1 stop
ONT10:35 pmOntario
Aug 25
ONT7:00 amOntario
7h 42m
1 stop
PWM5:42 pmPortland
$325
United Airlines
Aug 29
PWM5:03 pmPortland
8h 32m
1 stop
ONT10:35 pmOntario
Aug 31
ONT7:13 pmOntario
16h 21m
2 stops
PWM2:34 pmPortland
$412
United Airlines
Aug 29
PWM6:03 amPortland
12h 38m
2 stops
ONT3:41 pmOntario
Sep 1
ONT9:01 amOntario
11h 58m
2 stops
PWM11:59 pmPortland
$417

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 July 1, 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

Fri 8/28

2:45 pm-10:38 pm

1 stop10h 53m

Ontario

Mon 8/31

11:59 pm-12:30 pm

1 stop9h 31m

$265

PortlandOntario

PWM - ONT

PWMONT

Portland

Thu 8/20

2:40 pm-10:38 pm

1 stop10h 58m

Ontario

Sun 8/23

11:59 pm-1:45 pm

1 stop10h 46m

$296

PortlandOntario

PWM - ONT

PWMONT

Portland

Thu 8/20

8:00 am-1:31 pm

1 stop8h 31m

Ontario

Sun 8/23

7:05 am-8:06 pm

1 stop10h 01m

$318

PortlandOntario

PWM - ONT

PWMONT

Portland

Thu 8/20

5:30 am-1:31 pm

2 stops11h 01m

Ontario

Sun 8/23

7:05 am-8:06 pm

1 stop10h 01m

$323
Quickest round-trip

PortlandOntario

PWM - ONT

PWMONT

Portland

Thu 8/20

5:03 pm-10:35 pm

1 stop8h 32m

Ontario

Tue 8/25

7:00 am-5:42 pm

1 stop7h 42m

$325

PortlandOntario

PWM - ONT

PWMONT

Portland

Wed 8/19

2:40 pm-10:37 pm

1 stop10h 57m

Ontario

Sat 9/5

11:13 pm-12:21 pm

1 stop10h 08m

$327

PortlandOntario

PWM - ONT

PWMONT

Portland

Thu 8/20

5:30 am-3:19 pm

2 stops12h 49m

Ontario

Tue 8/25

10:29 am-11:41 pm

2 stops10h 12m

$329

PortlandOntario

PWM - ONT

PWMONT

Portland

Wed 8/19

8:00 am-1:31 pm

1 stop8h 31m

Ontario

Sun 8/23

8:01 pm-10:31 am

2 stops11h 30m

$344

PortlandOntario

PWM - ONT

PWMONT

Portland

Fri 8/28

2:45 pm-10:38 pm

1 stop10h 53m

Ontario

Sat 8/29

11:13 pm-12:30 pm

1 stop10h 17m

$346

PortlandOntario

PWM - ONT

PWMONT

Portland

Thu 8/27

6:30 am-9:52 pm

2 stops18h 22m

Ontario

Tue 9/1

12:00 pm-11:13 pm

1 stop8h 13m

$354

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 29% 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 05m

Direct flights

None
The fastest flight from Portland, Maine to Ontario takes 8h 05m
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 05m, 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 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.

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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