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$126+ Cheap flights from Portland, ME to San Francisco (PWM - SFO)

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 11/15. Fares are subject to change and may not be available on all flights or dates of travel.
PWM — SFO
Nov 22 — Nov 291
Sat 11/22
Sat 11/29
1 adult, Economy
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Cheapflights Tip: The best prices from Portland to San Francisco are usually found in September or February, booked 22 days in advance, depart on a Thursday or Wednesday and return on a Tuesday

Find flight deals from Portland to San Francisco

Cheapest flights from Portland to San Francisco
Explore the most affordable flight options available from Portland to San Francisco. Find the lowest fares from popular airlines and budget airlines, with prices last updated on October 23, 2025.

This American Airlines deal was found by Cheapflights users on 10/21. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/512:23 pmPWM - SFO
2 stops11h 07mAmerican Airlines
Wed 12/109:00 amSFO - PWM
1 stop9h 37mAmerican Airlines
Deal found 10/21$232
This Southwest deal was found by Cheapflights users on 10/22. 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 12/115:30 amPWM - SFO
1 stop10h 50mSouthwest
Sun 12/149:25 pmSFO - PWM
1 stop14h 30mSouthwest
Deal found 10/22$245
This Delta deal was found by Cheapflights users on 10/21. 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 12/44:53 pmPWM - SFO
1 stop9h 20mDelta
Wed 12/105:50 amSFO - PWM
1 stop7h 17mDelta
Deal found 10/21$257
This Delta deal was found by Cheapflights users on 10/21. 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.
Fri 12/54:53 pmPWM - SFO
1 stop9h 20mDelta
Wed 12/105:50 amSFO - PWM
1 stop7h 17mDelta
Deal found 10/21$260
This Delta deal was found by Cheapflights users on 10/22. 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 12/116:08 amPWM - SFO
1 stop9h 28mDelta
Sat 12/135:55 amSFO - PWM
2 stops13h 28mDelta
Deal found 10/22$262
This Delta deal was found by Cheapflights users on 10/22. 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 12/116:08 amPWM - SFO
2 stops14h 50mDelta
Sun 12/145:50 amSFO - PWM
1 stop7h 17mDelta
Deal found 10/22$265
This United Airlines deal was found by Cheapflights users on 10/21. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/96:00 amPWM - SFO
1 stop9h 08mUnited Airlines
Sat 12/279:10 pmSFO - PWM
1 stop9h 34mUnited Airlines
Deal found 10/21$301
This Delta deal was found by Cheapflights users on 10/23. 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.
Fri 11/74:48 pmPWM - SFO
1 stop8h 47mDelta
Tue 11/1110:30 pmSFO - PWM
1 stop11h 00mDelta
Deal found 10/23$321
This Southwest deal was found by Cheapflights users on 10/21. 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.
Tue 12/95:30 amPWM - SFO
1 stop10h 50mSouthwest
Sat 12/276:40 pmSFO - PWM
2 stops13h 30mSouthwest
Deal found 10/21$329

Cheap flight deals from Portland to San Francisco

Discover tips and strategies to find the most affordable flight options for your journey from Portland (PWM) to San Francisco (SFO). 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 October 23, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$232
(American Airlines)

One-way from

$126
(American Airlines)

Popular in

March

Cheapest in

September

Average price

$415
Provider with most accurate pricing for Portland-San Francisco flight deals.
Search Deals
Provider most trusted by Cheapflights users for Portland-San Francisco flights.
Search Deals
From Portland to San Francisco
Search Deals
One-way flight from Portland to San Francisco
Search Deals
Highest demand for flights based on searches. 5% potential increase in price ($24 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($8 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in October 2025
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Portland to San Francisco 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 October 23, 2025.
Use the filters below to find and compare flights from Portland to San Francisco that are best for you.

Fly from

Portland

Fly to

San Francisco

Route

Depart

Return

Price

PortlandSan Francisco

PWM - SFO

PWMSFO

Portland

Thu 12/11

5:30 am-1:20 pm

1 stop10h 50m

San Francisco

Sun 12/14

9:25 pm-2:55 pm

1 stop14h 30m

$245

PortlandSan Francisco

PWM - SFO

PWMSFO

Portland

Sun 12/7

6:08 am-12:36 pm

1 stop9h 28m

San Francisco

Sun 12/14

9:30 pm-12:13 pm

2 stops11h 43m

$262

PortlandSan Francisco

PWM - SFO

PWMSFO

Portland

Tue 2/24

2:35 pm-10:47 pm

2 stops11h 12m

San Francisco

Wed 2/25

6:00 am-11:05 pm

2 stops14h 05m

$298

PortlandSan Francisco

PWM - SFO

PWMSFO

Portland

Thu 3/5

6:00 am-12:15 pm

1 stop9h 15m

San Francisco

Sun 3/8

10:55 pm-10:48 am

1 stop8h 53m

$319

PortlandSan Francisco

PWM - SFO

PWMSFO

Portland

Tue 2/24

2:35 pm-10:47 pm

2 stops11h 12m

San Francisco

Mon 3/2

10:45 pm-11:57 am

1 stop10h 12m

$323

PortlandSan Francisco

PWM - SFO

PWMSFO

Portland

Wed 2/25

5:30 am-3:13 pm

2 stops12h 43m

San Francisco

Mon 3/2

10:45 pm-11:57 am

1 stop10h 12m

$323

PortlandSan Francisco

PWM - SFO

PWMSFO

Portland

Sat 2/28

2:35 pm-10:47 pm

2 stops11h 12m

San Francisco

Mon 3/2

9:30 pm-11:00 am

2 stops10h 30m

$328

PortlandSan Francisco

PWM - SFO

PWMSFO

Portland

Thu 12/11

6:00 am-2:47 pm

2 stops11h 47m

San Francisco

Fri 12/12

12:30 am-4:00 pm

2 stops12h 30m

$338

PortlandSan Francisco

PWM - SFO

PWMSFO

Portland

Thu 4/9

7:06 am-2:31 pm

2 stops10h 25m

San Francisco

Mon 4/13

11:08 pm-12:00 pm

1 stop9h 52m

$364

PortlandSan Francisco

PWM - SFO

PWMSFO

Portland

Wed 2/25

5:30 am-3:13 pm

2 stops12h 43m

San Francisco

Fri 2/27

6:00 am-11:57 am

2 stops26h 57m

$366

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/21

Showing 1-10 of 17 results
1
2

Compare providers for flights from Portland to San Francisco

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 Francisco in October.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy2 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
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 Francisco flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Portland, Maine-San Francisco flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Portland, Maine-San Francisco flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Portland, Maine-San Francisco flights, Cheapflights users trust FlightHub the most. FlightHub 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 Francisco 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 Francisco

Have a flexible travel schedule? Discover the best time to fly to San Francisco 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 Francisco

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

Use this chart to determine the optimal time to book a round-trip flight from Portland to San Francisco. Price data was last updated on October 17, 2025.

The best time to book flights from Portland, Maine to San Francisco is 22 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.

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

Currently, March is the cheapest month in which you can book a flight from Portland, Maine to San Francisco (average of $98). Flying from Portland, Maine to San Francisco in October is currently the most expensive (average of $177). 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.

What is the cheapest time of day to fly from PWM to SFO?

Find hourly flight availability from Portland to San Francisco. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated October 23, 2025.

Unlike in the morning, when flights are generally more expensive, you can save up to 20% on flights from Portland, Maine to San Francisco by exploring options for tickets in the evening.

What is the cheapest day to fly from Portland, Maine to San Francisco?

Use this chart to determine the cheapest time to fly round-trip from Portland to San Francisco. Price data was last updated on December 16, 2024.

Travelers seeking maximum savings on their Portland, Maine to San Francisco flight should consider departing on Friday afternoons when fares are most often at their lowest. Sunday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.

Reviews of airlines servicing San Francisco

Get insights into the airlines that provide service to San Francisco. 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 Francisco. Reviews last updated October 23, 2025.
See what other customers who have flown with Southwest, Delta, and United Airlines from Portland to San Francisco have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,236 reviews

Comfort

8.0

Entertainment

7.5

Food

7.0

Crew

8.6

Overall

8.0

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
8.0
Very good
4,236 reviews
Southwest
8.0
Very good
4,236 reviews

Comfort

8.0

Entertainment

7.5

Food

7.0

Crew

8.6

Overall

8.0

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
7,982 reviews
Southwest
8.0
Very good
4,236 reviews

Comfort

8.0

Entertainment

7.5

Food

7.0

Crew

8.6

Overall

8.0

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
8,995 reviews
Southwest
8.0
Very good
4,236 reviews

Comfort

8.0

Entertainment

7.5

Food

7.0

Crew

8.6

Overall

8.0

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
11,033 reviews
Southwest
8.0
Very good
4,236 reviews

Comfort

8.0

Entertainment

7.5

Food

7.0

Crew

8.6

Overall

8.0

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.
JetBlue
7.2
Good
2,908 reviews
Southwest
8.0
Very good
4,236 reviews

Comfort

8.0

Entertainment

7.5

Food

7.0

Crew

8.6

Overall

8.0

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 Francisco. 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 Francisco?

    There are many flights that can get you from Portland, Maine to San Francisco in 9h 15m. Fly via Southwest, Delta, or United Airlines to get the fastest option. Portland, Maine and San Francisco are separated by a distance of 2715 mi. This flight may include one or multiple stops.

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

    American Airlines, at $236, was found to be the cheapest airline from Portland, Maine to San Francisco.Alternate airlines to your destination round-trip include Southwest and Delta. Users have found that American Airlines is 45% cheaper than the other options available to this destination.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Portland to San Francisco 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 Francisco?

    Currently, March is the cheapest month in which you can book a flight from Portland, Maine to San Francisco (average of $98). Flying from Portland, Maine to San Francisco in October is currently the most expensive (average of $177). 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 Francisco?

Book flights to San Francisco if you plan to visit one of these locations
Roseville
Santa Cruz
Livermore
South San Francisco
Turlock
Antioch
Watsonville
Santa Clara
Manteca
Sunnyvale
Vacaville
Vallejo
Hollister
Foster City
Union City
Fairfield
Burlingame
Redwood City
Lodi
San Mateo

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Top 5 airlines flying from Portland to San Francisco

Discover the top 5 airlines that operate flights from Portland to San Francisco. 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 October 23, 2025.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$236Average$437FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$272Average$444FlexibilityNo cancel feeOn-time63%
DeltaCheapest$276Average$385FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$276Average$497FlexibilityNo cancel feeOn-time69%
JetBlueCheapest$320Average$495FlexibilityNo cancel feeOn-time62%

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