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$159+ Cheap flights from Portland, ME to San Diego (PWM - SAN)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 2/23. Fares are subject to change and may not be available on all flights or dates of travel.
PWM — SAN
Jan 11 — Jan 181
Sun 1/11
Sun 1/18
1 adult, Economy
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Find cheap flights from Portland to San Diego with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

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Cheapflights Tip: The best prices from Portland to San Diego are usually found in September or January, booked 84 days in advance, depart on a Wednesday or Friday and return on a Saturday

Cheap flight deals from Portland to San Diego

Cheapest flights from Portland to San Diego
Explore the most affordable flight options available from Portland to San Diego. Find the lowest fares from popular airlines and budget airlines, with prices last updated on December 12, 2025.

This Southwest deal was found by Cheapflights users on 12/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/255:30 amPWM - SAN
2 stops10h 50mSouthwest
Wed 12/319:55 amSAN - PWM
2 stops9h 20mSouthwest
Deal found 12/11$557
This Southwest deal was found by Cheapflights users on 12/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/255:30 amPWM - SAN
2 stops10h 50mSouthwest
Thu 1/16:50 amSAN - PWM
1 stop12h 25mSouthwest
Deal found 12/10$595
This Southwest deal was found by Cheapflights users on 12/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/255:30 amPWM - SAN
2 stops10h 50mSouthwest
Fri 1/211:45 amSAN - PWM
2 stops9h 20mSouthwest
Deal found 12/10$664
This Delta deal was found by Cheapflights users on 12/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/255:45 amPWM - SAN
1 stop9h 18mDelta
Wed 12/3111:25 amSAN - PWM
1 stop8h 18mDelta
Deal found 12/10$679
This Southwest deal was found by Cheapflights users on 12/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/205:40 pmPWM - SAN
1 stop8h 20mSouthwest
Mon 12/2910:50 amSAN - PWM
1 stop10h 15mSouthwest
Deal found 12/10$772

Find flight deals from Portland to San Diego

Discover tips and strategies to find the most affordable flight options for your journey from Portland (PWM) to San Diego (SAN). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated December 12, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$326
(Delta)

One-way from

$159
(Kiwi.com)

Popular in

December

Cheapest in

September

Average price

$686
Provider with most accurate pricing for Portland-San Diego flight deals.
Search Deals
Provider most trusted by Cheapflights users for Portland-San Diego flights.
Search Deals
From Portland to San Diego
Search Deals
One-way flight from Portland to San Diego
Search Deals
Highest demand for flights based on searches. 1% potential increase in price ($7 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($17 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Portland to San Diego 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, Cheapflights users made 2,558,603 searches. Data last updated December 12, 2025.
Use the filters below to find and compare flights from Portland to San Diego that are best for you.

Fly from

Portland

Fly to

San Diego

Route

Depart

Return

Price

PortlandSan Diego

PWM - SAN

PWMSAN

Portland

Wed 3/4

12:15 pm-10:20 pm

2 stops13h 05m

San Diego

Wed 3/11

7:20 am-12:10 am

2 stops13h 50m

$327

PortlandSan Diego

PWM - SAN

PWMSAN

Portland

Sat 1/10

5:30 am-12:03 pm

1 stop9h 33m

San Diego

Wed 1/14

11:08 am-10:27 pm

1 stop8h 19m

$351

PortlandSan Diego

PWM - SAN

PWMSAN

Portland

Mon 1/12

2:35 pm-8:25 pm

1 stop8h 50m

San Diego

Wed 1/14

6:35 am-10:27 pm

2 stops12h 52m

$359

PortlandSan Diego

PWM - SAN

PWMSAN

Portland

Sat 1/10

3:05 pm-9:28 pm

1 stop9h 23m

San Diego

Sat 1/24

8:10 am-6:54 pm

1 stop7h 44m

$367

PortlandSan Diego

PWM - SAN

PWMSAN

Portland

Mon 1/12

2:35 pm-8:25 pm

1 stop8h 50m

San Diego

Fri 1/16

10:00 pm-1:45 pm

1 stop12h 45m

$368

PortlandSan Diego

PWM - SAN

PWMSAN

Portland

Sat 1/10

1:13 pm-10:31 pm

2 stops12h 18m

San Diego

Fri 1/16

10:00 pm-1:45 pm

1 stop12h 45m

$370

PortlandSan Diego

PWM - SAN

PWMSAN

Portland

Sat 1/10

6:17 am-5:39 pm

2 stops14h 22m

San Diego

Sat 1/31

5:35 pm-12:03 pm

2 stops15h 28m

$373

PortlandSan Diego

PWM - SAN

PWMSAN

Portland

Wed 3/4

12:45 pm-9:00 pm

1 stop11h 15m

San Diego

Tue 3/17

12:45 pm-11:05 pm

1 stop7h 20m

$391

PortlandSan Diego

PWM - SAN

PWMSAN

Portland

Sun 1/11

3:55 pm-9:30 pm

1 stop8h 35m

San Diego

Tue 1/13

12:00 pm-10:15 pm

1 stop7h 15m

$391

PortlandSan Diego

PWM - SAN

PWMSAN

Portland

Wed 3/4

3:30 pm-9:00 pm

1 stop8h 30m

San Diego

Wed 3/11

12:45 pm-11:05 pm

1 stop7h 20m

$391

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/10

Showing 1-10 of 20 results
1
2

Compare providers for flights from Portland to San Diego

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Portland to San Diego in December.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy2 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*1 star
eDreamsPrice Accuracy3 starsTrust Score*3 stars
PricelinePrice Accuracy1 starTrust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Portland, Maine-San Diego flights, users find the pricing of eDreams to be most consistent on Cheapflights vs. eDreams Users can find the same prices on Portland, Maine-San Diego flight deals on Cheapflights vs. eDreams >95% of the time. Price accuracy is based on data collected from Portland, Maine-San Diego flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Portland, Maine-San Diego flights, Cheapflights users trust eDreams the most. eDreams has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Portland, Maine-San Diego flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from Portland to San Diego

Have a flexible travel schedule? Discover the best time to fly to San Diego from Portland with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Portland to San Diego

How far ahead should I book a flight from Portland, Maine to San Diego?

Use this chart to determine the optimal time to book a round-trip flight from Portland to San Diego. Price data was last updated on December 5, 2025.

To ensure you get the cheapest price possible for a flight from Portland, Maine to San Diego, you should look to book at least 84 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.

What is the cheapest month to book a flight from Portland, Maine to San Diego?

Currently, March is the cheapest month in which you can book a flight from Portland, Maine to San Diego (average of $118). Flying from Portland, Maine to San Diego in July is currently the most expensive (average of $197). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

How much does it cost to fly round-trip from Portland, Maine to San Diego?

Reviews of airlines servicing San Diego

Get insights into the airlines that provide service to San Diego. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to San Diego. Reviews last updated December 12, 2025.
Read reviews from past customers who have flown Southwest, Delta, and United Airlines from Portland to San Diego. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
7.9
Good
4,253 reviews

Food

7.0

Comfort

8.0

Crew

8.6

Entertainment

7.5

Overall

7.9

Boarding

8.1

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
Southwest
7.9
Good
4,253 reviews
Southwest
7.9
Good
4,253 reviews

Food

7.0

Comfort

8.0

Crew

8.6

Entertainment

7.5

Overall

7.9

Boarding

8.1

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
Delta
7.9
Good
8,008 reviews
Southwest
7.9
Good
4,253 reviews

Food

7.0

Comfort

8.0

Crew

8.6

Entertainment

7.5

Overall

7.9

Boarding

8.1

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
United Airlines
7.4
Good
9,095 reviews
Southwest
7.9
Good
4,253 reviews

Food

7.0

Comfort

8.0

Crew

8.6

Entertainment

7.5

Overall

7.9

Boarding

8.1

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
American Airlines
7.2
Good
11,050 reviews
Southwest
7.9
Good
4,253 reviews

Food

7.0

Comfort

8.0

Crew

8.6

Entertainment

7.5

Overall

7.9

Boarding

8.1

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.

Related info for your journey

Find useful and relevant information for your journey from Portland to San Diego. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • How long is the flight from Portland, Maine to San Diego?

    For as low as $353, Delta can have you in San Diego from Portland, Maine in 9h 33m. The distance between Portland, Maine and San Diego is about 2616 mi.

  • What are the cheapest airlines flying from Portland, Maine to San Diego round-trip?

    Delta, at $311, was found to be the cheapest airline from Portland, Maine to San Diego.Alternate airlines to your destination round-trip include American Airlines and Southwest. These flights start at 38% lower than the current average price 3 months from now.

  • What are the cheapest airlines to fly from Portland, Maine to San Diego one-way?

    One-way options have recently been found by users for as low as $101 on American Airlines. Other airlines that offer cheap prices include Delta from $156 and Southwest from $178 one-way.

  • Can I find deals for flights from Portland to San Diego that include hotel bookings?

    Yes. In addition to deals on Portland to San Diego flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Portland to San Diego?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Portland to San Diego.

  • Can I find deals for business class flights from Portland to San Diego?

    Yes. Cheapflights offers flight deals from Portland to San Diego by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Portland, Maine to San Diego?

    Currently, March is the cheapest month in which you can book a flight from Portland, Maine to San Diego (average of $118). Flying from Portland, Maine to San Diego in July is currently the most expensive (average of $197). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Traveling to a place near San Diego?

Book flights to San Diego if you plan to visit one of these locations
El Cajon
Chula Vista
Coronado
La Mesa
Poway
Lemon Grove
Julian
National City

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Top 4 airlines flying from Portland to San Diego

Discover the top 4 airlines that operate flights from Portland to San Diego. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated December 12, 2025.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$311Average$457FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$322Average$437FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$350Average$511FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$374Average$523FlexibilityNo cancel feeOn-time69%

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