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$114+ 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
ago. 19 — ago. 261
mar. 8/19
mar. 8/26
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 87 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 agosto 14, 2025.

Round-trip from

$227
(American Airlines)

One-way from

$114
(American Airlines)

Popular in

July

Cheapest in

September

Average price

$427
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. 1% potential increase in price ($7 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($7 potential savings vs. average RT price).
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Average for round-trip flights in August 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 agosto 14, 2025.

This American Airlines deal was found by Cheapflights users on 8/14. 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.
mié. 11/1212:32 pmPWM - SFO
1 stop9h 52mAmerican Airlines
mié. 11/196:00 amSFO - PWM
1 stop8h 07mAmerican Airlines
Deal found 8/14$227
This American Airlines deal was found by Cheapflights users on 8/13. 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.
sáb. 9/61:09 pmPWM - SFO
1 stop9h 25mAmerican Airlines
mié. 9/106:25 amSFO - PWM
1 stop8h 46mAmerican Airlines
Deal found 8/13$239
This American Airlines deal was found by Cheapflights users on 8/13. 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.
jue. 9/41:10 pmPWM - SFO
1 stop9h 24mAmerican Airlines
mar. 9/912:47 amSFO - PWM
1 stop8h 02mAmerican Airlines
Deal found 8/13$243
This American Airlines deal was found by Cheapflights users on 8/14. 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.
vie. 9/193:56 pmPWM - SFO
1 stop8h 50mAmerican Airlines
mar. 9/236:30 amSFO - PWM
1 stop8h 09mAmerican Airlines
Deal found 8/14$249
This American Airlines deal was found by Cheapflights users on 8/13. 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.
sáb. 9/61:09 pmPWM - SFO
1 stop9h 25mAmerican Airlines
sáb. 9/138:00 amSFO - PWM
1 stop11h 29mAmerican Airlines
Deal found 8/13$251
This American Airlines deal was found by Cheapflights users on 8/14. 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.
mar. 9/308:45 amPWM - SFO
1 stop9h 44mAmerican Airlines
mié. 10/16:25 amSFO - PWM
1 stop8h 14mAmerican Airlines
Deal found 8/14$252
This Southwest deal was found by Cheapflights users on 8/13. 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.
sáb. 9/68:15 amPWM - SFO
2 stops12h 35mSouthwest
sáb. 9/139:05 pmSFO - PWM
1 stop9h 35mSouthwest
Deal found 8/13$256

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 agosto 14, 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

mié. 11/5

7:02 am-1:38 pm

1 stop9h 36m

San Francisco

mar. 11/11

11:14 pm-12:07 pm

1 stop9h 53m

$227

PortlandSan Francisco

PWM - SFO

PWMSFO

Portland

mié. 11/12

12:32 pm-7:24 pm

1 stop9h 52m

San Francisco

mié. 11/19

6:30 am-6:13 pm

1 stop8h 43m

$227

PortlandSan Francisco

PWM - SFO

PWMSFO

Portland

sáb. 9/6

1:09 pm-7:34 pm

1 stop9h 25m

San Francisco

mié. 9/10

6:25 am-6:11 pm

1 stop8h 46m

$239

PortlandSan Francisco

PWM - SFO

PWMSFO

Portland

mié. 11/5

7:02 am-1:38 pm

1 stop9h 36m

San Francisco

lun. 11/10

6:00 am-5:07 pm

1 stop8h 07m

$243

PortlandSan Francisco

PWM - SFO

PWMSFO

Portland

jue. 9/4

1:10 pm-7:34 pm

1 stop9h 24m

San Francisco

mar. 9/9

12:47 am-11:49 am

1 stop8h 02m

$243

PortlandSan Francisco

PWM - SFO

PWMSFO

Portland

mié. 10/15

4:15 pm-11:35 pm

1 stop10h 20m

San Francisco

sáb. 10/18

9:45 pm-11:27 am

1 stop10h 42m

$243

PortlandSan Francisco

PWM - SFO

PWMSFO

Portland

mié. 9/17

2:30 pm-10:02 pm

1 stop10h 32m

$114

PortlandSan Francisco

PWM - SFO

PWMSFO

Portland

mié. 10/22

12:11 pm-5:59 pm

1 stop8h 48m

$114

PortlandSan Francisco

PWM - SFO

PWMSFO

Portland

mar. 12/16

7:44 am-5:19 pm

1 stop12h 35m

$114

PortlandSan Francisco

PWM - SFO

PWMSFO

Portland

mié. 9/3

6:00 am-3:00 pm

2 stops12h 00m

$119

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/14

Showing 1-10 of 15 results
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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 August 8, 2025.

The best time to book flights from Portland, Maine to San Francisco is 87 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 $358). 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 agosto 14, 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 agosto 14, 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
4,244 reviews

Crew

8.6

Boarding

8.1

Food

7.0

Overall

8.0

Entertainment

7.5

Comfort

8.0

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
4,244 reviews
Southwest
8.0
Very good
4,244 reviews

Crew

8.6

Boarding

8.1

Food

7.0

Overall

8.0

Entertainment

7.5

Comfort

8.0

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
7,980 reviews
Southwest
8.0
Very good
4,244 reviews

Crew

8.6

Boarding

8.1

Food

7.0

Overall

8.0

Entertainment

7.5

Comfort

8.0

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
8,916 reviews
Southwest
8.0
Very good
4,244 reviews

Crew

8.6

Boarding

8.1

Food

7.0

Overall

8.0

Entertainment

7.5

Comfort

8.0

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
4,244 reviews

Crew

8.6

Boarding

8.1

Food

7.0

Overall

8.0

Entertainment

7.5

Comfort

8.0

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
2,913 reviews
Southwest
8.0
Very good
4,244 reviews

Crew

8.6

Boarding

8.1

Food

7.0

Overall

8.0

Entertainment

7.5

Comfort

8.0

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.

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

    American Airlines, at $218, was found to be the cheapest airline from Portland, Maine to San Francisco.Alternate airlines to your destination round-trip include Delta and Southwest. Users have found that American Airlines is 48% 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 $358). 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
Mountain View
Turlock
Santa Clara
Hollister
Antioch
Watsonville
Manteca
Sunnyvale
Newark
Milpitas
Campbell
Foster City
San Leandro
Burlingame
Redwood City
Vallejo

Browse thousands of different options on Cheapflights for your next trip

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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 agosto 14, 2025.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$218Average$410FlexibilityNo cancel feeOn-time71%
DeltaCheapest$267Average$385FlexibilityNo cancel feeOn-timeN/A
SouthwestCheapest$272Average$457FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$276Average$490FlexibilityNo cancel feeOn-time69%
JetBlueCheapest$320Average$495FlexibilityNo cancel feeOn-time62%

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