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$139+ 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 8/15. Fares are subject to change and may not be available on all flights or dates of travel.
PWM — SFO
Jul 8 — Jul 151
Tue 7/8
Tue 7/15
1 adult, Economy
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Cheapflights Tip: The best prices from Portland to San Francisco are usually found in February or October, 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 July 3, 2025.

Round-trip from

$247
(American Airlines)

One-way from

$139
(American Airlines)

Popular in

April

Cheapest in

February

Average price

$486
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. 10% potential increase in price ($50 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($6 potential savings vs. average RT price).
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Average for round-trip flights in July 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 July 3, 2025.

This American Airlines deal was found by Cheapflights users on 7/3. 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.
Mon 10/274:15 pmPWM - SFO
1 stop10h 20mAmerican Airlines
Fri 10/3110:16 amSFO - PWM
1 stop9h 29mAmerican Airlines
Deal found 7/3$247
This Delta deal was found by Cheapflights users on 7/3. 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 9/195:00 pmPWM - SFO
2 stops9h 50mDelta
Sun 9/2112:45 amSFO - PWM
1 stop6h 50mDelta
Deal found 7/3$282
This Southwest deal was found by Cheapflights users on 6/30. 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.
Sun 9/215:35 amPWM - SFO
1 stop13h 05mSouthwest
Wed 9/249:05 pmSFO - PWM
1 stop9h 45mSouthwest
Deal found 6/30$286
This JetBlue deal was found by Cheapflights users on 7/3. 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 JetBlue is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/82:17 pmPWM - SFO
1 stop12h 26mJetBlue
Sun 10/128:00 amSFO - PWM
1 stop11h 02mJetBlue
Deal found 7/3$293
This United Airlines deal was found by Cheapflights users on 7/1. 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 7/227:15 pmPWM - SFO
1 stop8h 42mUnited Airlines
Sun 8/39:15 pmSFO - PWM
1 stop9h 09mUnited Airlines
Deal found 7/1$331

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 July 3, 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

Mon 10/27

4:15 pm-11:35 pm

1 stop10h 20m

San Francisco

Fri 10/31

10:16 am-10:45 pm

1 stop9h 29m

$247

PortlandSan Francisco

PWM - SFO

PWMSFO

Portland

Fri 9/19

5:00 pm-11:50 pm

2 stops9h 50m

San Francisco

Mon 9/22

12:45 am-10:38 am

1 stop6h 53m

$282

PortlandSan Francisco

PWM - SFO

PWMSFO

Portland

Sun 9/21

5:35 am-3:40 pm

1 stop13h 05m

San Francisco

Wed 9/24

9:05 pm-9:50 am

1 stop9h 45m

$286

PortlandSan Francisco

PWM - SFO

PWMSFO

Portland

Wed 10/8

2:17 pm-11:43 pm

1 stop12h 26m

San Francisco

Sun 10/12

8:00 am-10:02 pm

1 stop11h 02m

$293

PortlandSan Francisco

PWM - SFO

PWMSFO

Portland

Tue 7/22

7:15 pm-12:57 am

1 stop8h 42m

San Francisco

Sun 8/3

9:15 pm-9:24 am

1 stop9h 09m

$331

PortlandSan Francisco

PWM - SFO

PWMSFO

Portland

Fri 8/15

3:53 pm-9:41 pm

1 stop8h 48m

$139

PortlandSan Francisco

PWM - SFO

PWMSFO

Portland

Sat 8/16

6:00 am-5:17 pm

2 stops14h 17m

$144

PortlandSan Francisco

PWM - SFO

PWMSFO

Portland

Sun 8/17

6:10 am-11:50 am

1 stop8h 40m

$147

PortlandSan Francisco

PWM - SFO

PWMSFO

Portland

Tue 7/29

5:30 am-5:50 pm

1 stop15h 20m

$152

PortlandSan Francisco

PWM - SFO

PWMSFO

Portland

Sat 7/12

6:58 pm-10:25 am

1 stop18h 27m

$170

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/2

Showing 1-10 of 13 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 June 27, 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 $360). 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 July 3, 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 July 3, 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
4,266 reviews

Comfort

8.0

Food

7.0

Overall

8.0

Crew

8.6

Entertainment

7.6

Boarding

8.2

Reviews

1 / 20
10.0
Excellent

Merlyn,Feb 2025

LAX - SMF

New Terminal is neat, lost of stores and places to catch a bite.
Southwest
8.0
Very good
4,266 reviews
Southwest
8.0
Very good
4,266 reviews

Comfort

8.0

Food

7.0

Overall

8.0

Crew

8.6

Entertainment

7.6

Boarding

8.2

Reviews

1 / 20
10.0
Excellent

Merlyn,Feb 2025

LAX - SMF

New Terminal is neat, lost of stores and places to catch a bite.
Delta
8.0
Very good
7,982 reviews
Southwest
8.0
Very good
4,266 reviews

Comfort

8.0

Food

7.0

Overall

8.0

Crew

8.6

Entertainment

7.6

Boarding

8.2

Reviews

1 / 20
10.0
Excellent

Merlyn,Feb 2025

LAX - SMF

New Terminal is neat, lost of stores and places to catch a bite.
United Airlines
7.4
Good
8,861 reviews
Southwest
8.0
Very good
4,266 reviews

Comfort

8.0

Food

7.0

Overall

8.0

Crew

8.6

Entertainment

7.6

Boarding

8.2

Reviews

1 / 20
10.0
Excellent

Merlyn,Feb 2025

LAX - SMF

New Terminal is neat, lost of stores and places to catch a bite.
JetBlue
7.3
Good
2,916 reviews
Southwest
8.0
Very good
4,266 reviews

Comfort

8.0

Food

7.0

Overall

8.0

Crew

8.6

Entertainment

7.6

Boarding

8.2

Reviews

1 / 20
10.0
Excellent

Merlyn,Feb 2025

LAX - SMF

New Terminal is neat, lost of stores and places to catch a bite.
American Airlines
7.2
Good
10,000 reviews
Southwest
8.0
Very good
4,266 reviews

Comfort

8.0

Food

7.0

Overall

8.0

Crew

8.6

Entertainment

7.6

Boarding

8.2

Reviews

1 / 20
10.0
Excellent

Merlyn,Feb 2025

LAX - SMF

New Terminal is neat, lost of stores and places to catch a bite.

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 $247, 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 43% cheaper than the other options available to this destination.

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

    The cheapest airlines for a one-way flight from Portland, Maine to San Francisco are American Airlines ($139), Delta ($144), and JetBlue ($147).

  • 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 $360). 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 Portland?

Book flights to Portland if you plan to visit one of these locations
Roseville
Mountain View
South San Francisco
Livermore
Santa Cruz
Turlock
Manteca
Watsonville
Antioch
Hollister
Newark
Alameda
Hayward
Milpitas
Sunnyvale
Daly City
Campbell
Foster City
Capitola
Richmond

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Top 4 airlines flying from Portland to San Francisco

Discover the top 4 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 July 3, 2025.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$216Average$405FlexibilityNo cancel feeOn-time71%
DeltaCheapest$256Average$386FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$276Average$486FlexibilityNo cancel feeOn-time69%
JetBlueCheapest$320Average$535FlexibilityNo cancel feeOn-time62%

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