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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 10/22. Fares are subject to change and may not be available on all flights or dates of travel.
PWM — SFO
Oct 17 — Oct 241
Fri 10/17
Fri 10/24
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 Friday or Wednesday and return on a Tuesday

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 September 17, 2025.

Round-trip from

$251
(American Airlines)

One-way from

$126
(American Airlines)

Popular in

November

Cheapest in

September

Average price

$350
From Portland to San Francisco
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One-way flight from Portland to San Francisco
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Highest demand for flights based on searches. 9% potential increase in price ($46 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($17 potential savings vs. average RT price).
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Average for round-trip flights in September 2025
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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 September 17, 2025.

This Southwest deal was found by Cheapflights users on 9/15. 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 11/223:05 pmPWM - SFO
1 stop11h 20mSouthwest
Thu 11/279:25 pmSFO - PWM
1 stop10h 45mSouthwest
Deal found 9/15$244
This American Airlines deal was found by Cheapflights users on 9/15. 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.
Wed 11/53:52 pmPWM - SFO
1 stop9h 13mAmerican Airlines
Tue 11/1111:14 pmSFO - PWM
1 stop9h 54mAmerican Airlines
Deal found 9/15$251
This American Airlines deal was found by Cheapflights users on 9/16. 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.
Sat 11/18:19 amPWM - SFO
2 stops12h 00mAmerican Airlines
Sat 11/86:00 amSFO - PWM
2 stops12h 47mAmerican Airlines
Deal found 9/16$261
This United Airlines deal was found by Cheapflights users on 9/15. 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.
Wed 10/87:25 pmPWM - SFO
1 stop8h 30mUnited Airlines
Sun 10/125:15 amSFO - PWM
1 stop9h 27mUnited Airlines
Deal found 9/15$269
This United Airlines deal was found by Cheapflights users on 9/15. 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.
Wed 10/157:25 pmPWM - SFO
1 stop8h 30mUnited Airlines
Wed 10/221:02 pmSFO - PWM
1 stop7h 57mUnited Airlines
Deal found 9/15$280
This Delta deal was found by Cheapflights users on 9/15. 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.
Wed 10/294:48 pmPWM - SFO
1 stop8h 47mDelta
Sun 11/25:55 amSFO - PWM
1 stop7h 08mDelta
Deal found 9/15$282
This Delta deal was found by Cheapflights users on 9/15. 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.
Mon 11/104:53 pmPWM - SFO
1 stop8h 19mDelta
Wed 11/196:00 amSFO - PWM
1 stop7h 07mDelta
Deal found 9/15$294
This American Airlines deal was found by Cheapflights users on 9/15. 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.
Wed 10/2212:11 pmPWM - SFO
1 stop11h 16mAmerican Airlines
Sun 10/2611:36 pmSFO - PWM
1 stop11h 16mAmerican Airlines
Deal found 9/15$295
This Delta deal was found by Cheapflights users on 9/15. 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.
Mon 11/104:53 pmPWM - SFO
2 stops10h 19mDelta
Thu 11/206:00 amSFO - PWM
2 stops13h 19mDelta
Deal found 9/15$297

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 September 17, 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

Wed 11/12

6:00 am-12:08 pm

1 stop9h 08m

San Francisco

Wed 11/19

5:00 am-3:48 pm

1 stop7h 48m

$251

PortlandSan Francisco

PWM - SFO

PWMSFO

Portland

Wed 11/5

3:52 pm-10:05 pm

1 stop9h 13m

San Francisco

Tue 11/11

7:10 am-9:35 pm

2 stops11h 25m

$256

PortlandSan Francisco

PWM - SFO

PWMSFO

Portland

Wed 11/12

5:30 am-1:20 pm

1 stop10h 50m

San Francisco

Wed 11/19

8:20 am-10:15 pm

2 stops10h 55m

$256

PortlandSan Francisco

PWM - SFO

PWMSFO

Portland

Sat 11/1

6:20 am-12:29 pm

1 stop9h 09m

San Francisco

Sat 11/8

6:00 am-9:47 pm

2 stops12h 47m

$256

PortlandSan Francisco

PWM - SFO

PWMSFO

Portland

Wed 11/5

3:52 pm-10:05 pm

1 stop9h 13m

San Francisco

Mon 11/10

11:14 pm-12:08 pm

1 stop9h 54m

$269

PortlandSan Francisco

PWM - SFO

PWMSFO

Portland

Wed 11/12

1:25 pm-8:56 pm

1 stop10h 31m

San Francisco

Tue 11/18

12:45 am-4:07 pm

2 stops12h 22m

$282

PortlandSan Francisco

PWM - SFO

PWMSFO

Portland

Wed 10/29

1:27 pm-9:06 pm

1 stop10h 39m

San Francisco

Sun 11/2

5:55 am-4:03 pm

1 stop7h 08m

$282

PortlandSan Francisco

PWM - SFO

PWMSFO

Portland

Sat 11/1

4:48 pm-10:35 pm

1 stop8h 47m

San Francisco

Fri 11/7

12:35 am-4:03 pm

2 stops12h 28m

$282

PortlandSan Francisco

PWM - SFO

PWMSFO

Portland

Thu 12/4

4:53 pm-10:18 pm

1 stop8h 25m

San Francisco

Sun 12/7

6:00 am-4:06 pm

1 stop7h 06m

$287

PortlandSan Francisco

PWM - SFO

PWMSFO

Portland

Wed 11/5

1:46 pm-11:56 pm

2 stops13h 10m

San Francisco

Tue 11/11

9:30 pm-12:08 pm

2 stops11h 38m

$287

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/15

Showing 1-10 of 16 results
1
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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 September 12, 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, January is the cheapest month in which you can book a flight from Portland, Maine to San Francisco (average of $276). Flying from Portland, Maine to San Francisco in June is currently the most expensive (average of $357). 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 September 17, 2025.

Unlike in the morning, when flights are generally more expensive, you can save up to 18% 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 September 17, 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
4,242 reviews

Overall

8.0

Comfort

8.0

Crew

8.6

Food

7.0

Boarding

8.1

Entertainment

7.5

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
4,242 reviews
Southwest
8.0
Very good
4,242 reviews

Overall

8.0

Comfort

8.0

Crew

8.6

Food

7.0

Boarding

8.1

Entertainment

7.5

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
8.0
Very good
7,961 reviews
Southwest
8.0
Very good
4,242 reviews

Overall

8.0

Comfort

8.0

Crew

8.6

Food

7.0

Boarding

8.1

Entertainment

7.5

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
8,926 reviews
Southwest
8.0
Very good
4,242 reviews

Overall

8.0

Comfort

8.0

Crew

8.6

Food

7.0

Boarding

8.1

Entertainment

7.5

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
10,000 reviews
Southwest
8.0
Very good
4,242 reviews

Overall

8.0

Comfort

8.0

Crew

8.6

Food

7.0

Boarding

8.1

Entertainment

7.5

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
2,914 reviews
Southwest
8.0
Very good
4,242 reviews

Overall

8.0

Comfort

8.0

Crew

8.6

Food

7.0

Boarding

8.1

Entertainment

7.5

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 08m. Fly via United Airlines, American Airlines, or Southwest 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 $232, 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 47% 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, January is the cheapest month in which you can book a flight from Portland, Maine to San Francisco (average of $276). Flying from Portland, Maine to San Francisco in June is currently the most expensive (average of $357). 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
Hollister
Vacaville
Foster City
Union City
Vallejo
Burlingame
Redwood City
San Mateo
San Leandro
Lathrop

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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 September 17, 2025.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$232Average$423FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$272Average$444FlexibilityNo cancel feeOn-time63%
DeltaCheapest$276Average$386FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$276Average$491FlexibilityNo cancel feeOn-time69%
JetBlueCheapest$320Average$490FlexibilityNo cancel feeOn-time62%

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