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Cheap flights from Portland, Maine to Los Angeles from $149

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 1/18. 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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0 bags

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Find the cheapest flights from Portland, Maine to Los Angeles

Cheap round-trip flights

Delta Logo
5:30 am - 11:38 amPWM-ONT
9h 08m1 stop
Delta Logo
10:30 pm - 11:00 amONT-PWM
9h 30m2 stops
$302Delta
Find Deal
Sun, Jan 25 - Mon, Feb 2
Delta Logo
5:30 am - 11:38 amPWM-ONT
9h 08m1 stop
Delta Logo
10:30 pm - 1:51 pmONT-PWM
12h 21m2 stops
$312Delta
Find Deal
Wed, Mar 11 - Tue, Mar 24
United Airlines Logo
4:54 pm - 10:31 pmPWM-ONT
8h 37m1 stop
United Airlines Logo
5:05 am - 3:48 pmONT-PWM
7h 43m1 stop
$351United Airlines
Find Deal
Wed, Nov 5 - Sat, Nov 8
Delta Logo
5:30 am - 11:38 amPWM-ONT
9h 08m1 stop
Delta Logo
10:30 pm - 1:51 pmONT-PWM
12h 21m2 stops
$373Delta
Find Deal
Thu, Jan 22 - Sat, Jan 31
Delta Logo
11:25 am - 9:14 pmPWM-ONT
12h 49m2 stops
Delta Logo
10:30 pm - 1:51 pmONT-PWM
12h 21m2 stops
$378Delta
Find Deal
Tue, Mar 17 - Tue, Mar 24
American Airlines Logo
7:02 am - 6:20 pmPWM-ONT
14h 18m2 stops
American Airlines Logo
10:28 am - 11:50 pmONT-PWM
10h 22m2 stops
$388American Airlines
Find Deal
Wed, Dec 17 - Wed, Jan 7
United Airlines Logo
6:00 am - 6:00 pmPWM-ONT
15h 00m3 stops
United Airlines Logo
6:02 am - 11:17 pmONT-PWM
14h 15m2 stops
$412United Airlines
Find Deal
Tue, Mar 17 - Tue, Mar 24
Southwest Logo
11:50 am - 5:15 pmPWM-ONT
8h 25m1 stop
Southwest Logo
9:10 pm - 2:40 pmONT-PWM
14h 30m2 stops
$472Southwest
Find Deal
Thu, Dec 18 - Sun, Dec 28
Southwest Logo
3:00 pm - 11:15 pmPWM-ONT
11h 15m2 stops
Southwest Logo
9:10 pm - 2:40 pmONT-PWM
14h 30m2 stops
$502Southwest
Find Deal
Thu, Dec 18 - Sun, Dec 28
American Airlines Logo
8:11 am - 1:43 pmPWM-ONT
8h 32m1 stop
American Airlines Logo
7:27 pm - 11:28 amONT-PWM
13h 01m2 stops
$520American Airlines
Find Deal
Wed, Oct 8 - Sun, Oct 12

Delta flights from Portland, Maine to Ontario

Our best Delta deals on Portland, Maine to Ontario flight tickets
Delta
Jan 25
PWM5:30 amPortland
9h 08m
1 stop
ONT11:38 amOntario
Feb 3
ONT10:30 pmOntario
9h 30m
2 stops
PWM11:00 amPortland
$302
Find similar
Delta
Mar 11
PWM5:30 amPortland
9h 08m
1 stop
ONT11:38 amOntario
Mar 24
ONT10:30 pmOntario
12h 21m
2 stops
PWM1:51 pmPortland
$312
Find similar
Delta
Jan 22
PWM5:30 amPortland
9h 08m
1 stop
ONT11:38 amOntario
Jan 31
ONT10:30 pmOntario
12h 21m
2 stops
PWM1:51 pmPortland
$373
Find similar

American Airlines flights from Portland, Maine to Ontario

Our best American Airlines deals on Portland, Maine to Ontario flight tickets
American Airlines
Dec 17
PWM7:02 amPortland
14h 18m
2 stops
ONT6:20 pmOntario
Jan 7
ONT10:28 amOntario
10h 22m
2 stops
PWM11:50 pmPortland
$388
Find similar
American Airlines
Oct 8
PWM8:11 amPortland
8h 32m
1 stop
ONT1:43 pmOntario
Oct 12
ONT7:27 pmOntario
13h 01m
2 stops
PWM11:28 amPortland
$520
Find similar
American Airlines
Oct 8
PWM6:00 amPortland
12h 24m
2 stops
ONT3:24 pmOntario
Oct 12
ONT7:27 pmOntario
13h 01m
2 stops
PWM11:28 amPortland
$627
Find similar

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 September 25, 2025.
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

Sun 1/25

5:30 am-11:38 am

1 stop9h 08m

Ontario

Mon 2/2

10:30 pm-11:00 am

2 stops9h 30m

$302

PortlandOntario

PWM - ONT

PWMONT

Portland

Wed 3/11

5:30 am-11:38 am

1 stop9h 08m

Ontario

Tue 3/24

10:30 pm-1:51 pm

2 stops12h 21m

$312

PortlandOntario

PWM - ONT

PWMONT

Portland

Wed 11/5

4:54 pm-10:31 pm

1 stop8h 37m

Ontario

Sat 11/8

5:05 am-3:48 pm

1 stop7h 43m

$351

PortlandOntario

PWM - ONT

PWMONT

Portland

Thu 1/22

5:30 am-11:38 am

1 stop9h 08m

Ontario

Sat 1/31

10:30 pm-1:51 pm

2 stops12h 21m

$373

PortlandOntario

PWM - ONT

PWMONT

Portland

Tue 3/17

11:25 am-9:14 pm

2 stops12h 49m

Ontario

Tue 3/24

10:30 pm-1:51 pm

2 stops12h 21m

$378

PortlandOntario

PWM - ONT

PWMONT

Portland

Wed 12/17

7:02 am-6:20 pm

2 stops14h 18m

Ontario

Wed 1/7

10:28 am-11:50 pm

2 stops10h 22m

$388

PortlandOntario

PWM - ONT

PWMONT

Portland

Tue 3/17

6:00 am-6:00 pm

3 stops15h 00m

Ontario

Tue 3/24

6:02 am-11:17 pm

2 stops14h 15m

$412

PortlandOntario

PWM - ONT

PWMONT

Portland

Thu 12/18

11:50 am-5:15 pm

1 stop8h 25m

Ontario

Sun 12/28

9:10 pm-2:40 pm

2 stops14h 30m

$472

PortlandOntario

PWM - ONT

PWMONT

Portland

Thu 12/18

3:00 pm-11:15 pm

2 stops11h 15m

Ontario

Sun 12/28

9:10 pm-2:40 pm

2 stops14h 30m

$502

PortlandOntario

PWM - ONT

PWMONT

Portland

Wed 10/8

8:11 am-1:43 pm

1 stop8h 32m

Ontario

Sun 10/12

7:27 pm-11:28 am

2 stops13h 01m

$520

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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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

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 56% 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

Direct flights

None
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?

  • 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
American AirlinesPriceFrom $279Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights
DeltaPriceFrom $302Free CancellationRating
7.9
7,973 reviews
Search Delta 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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