$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 5/6. Fares are subject to change and may not be available on all flights or dates of travel.
PWM — SFO
Mar 27 — Apr 31
1 adult, Economy
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Find cheap flights from Portland to San Francisco 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
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Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.Cheap flight deals from Portland to San Francisco
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Last-minute
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Cheapest flights from Portland to San FranciscoExplore 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 February 25, 2026.
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 February 25, 2026.
This American Airlines deal was found by Cheapflights users on 2/25. 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.
Tue 3/315:40 pm
PWM
- SFO
1 stop9h 04m
American Airlines
Tue 4/145:45 am
SFO
- PWM
1 stop9h 53m
American Airlines
Deal found 2/25![American Airlines logo]()
$256
This Delta deal was found by Cheapflights users on 2/24. 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.
Tue 4/74:48 pm
PWM
- SFO
1 stop8h 48m
Delta
Mon 4/1310:55 pm
SFO
- PWM
1 stop10h 10m
Delta
Deal found 2/24![Delta logo]()
$257
This Delta deal was found by Cheapflights users on 2/24. 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.
Tue 3/314:48 pm
PWM
- SFO
1 stop8h 48m
Delta
Tue 4/1410:30 pm
SFO
- PWM
2 stops14h 27m
Delta
Deal found 2/24![Delta logo]()
$262
This American Airlines deal was found by Cheapflights users on 2/23. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/106:01 pm
PWM
- SFO
1 stop8h 58m
American Airlines
Mon 4/1310:28 pm
SFO
- PWM
1 stop11h 10m
American Airlines
Deal found 2/23![American Airlines logo]()
$275
This Delta deal was found by Cheapflights users on 2/23. 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 5/812:55 pm
PWM
- SFO
2 stops11h 15m
Delta
Wed 5/1311:34 am
SFO
- PWM
2 stops10h 09m
Delta
Deal found 2/23![Delta logo]()
$280
This Delta deal was found by Cheapflights users on 2/24. 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 4/312:51 pm
PWM
- SFO
1 stop9h 16m
Delta
Tue 4/1410:55 pm
SFO
- PWM
1 stop10h 10m
Delta
Deal found 2/24![Delta logo]()
$283
This American Airlines deal was found by Cheapflights users on 2/23. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/175:40 pm
PWM
- SFO
1 stop9h 04m
American Airlines
Tue 3/2411:49 pm
SFO
- PWM
1 stop9h 25m
American Airlines
Deal found 2/23![American Airlines logo]()
$285
This American Airlines deal was found by Cheapflights users on 2/23. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/35:40 pm
PWM
- SFO
1 stop9h 04m
American Airlines
Wed 4/85:30 am
SFO
- PWM
1 stop9h 01m
American Airlines
Deal found 2/23![American Airlines logo]()
$291
This United Airlines deal was found by Cheapflights users on 2/24. 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.
Sat 9/126:20 pm
PWM
- SFO
1 stop9h 14m
United Airlines
Sat 9/198:10 am
SFO
- PWM
Nonstop5h 49m
United Airlines
Deal found 2/24![United Airlines logo]()
$299
Best flights from Portland to San FranciscoDiscover carefully curated flight deals from Portland to San Francisco that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated February 25, 2026.
Discover carefully curated flight deals from Portland to San Francisco that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated February 25, 2026.
This Delta deal was found by Cheapflights users on 2/24. 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.
Tue 3/314:48 pm
PWM
- SFO
2 stops10h 11m
Delta
Tue 4/1411:39 pm
SFO
- PWM
2 stops13h 18m
Delta
Deal found 2/24![Delta logo]()
$267
This Southwest deal was found by Cheapflights users on 2/21. 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.
Sat 4/115:40 am
PWM
- SFO
1 stop11h 45m
Southwest
Sat 4/189:15 pm
SFO
- PWM
1 stop11h 50m
Southwest
Deal found 2/21![Southwest logo]()
$424
This Delta deal was found by Cheapflights users on 2/21. 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 5/76:00 am
PWM
- SFO
2 stops12h 56m
Delta
Sun 5/1011:59 pm
SFO
- PWM
1 stop9h 01m
Delta
Deal found 2/21![Delta logo]()
$429
This Southwest deal was found by Cheapflights users on 2/21. 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.
Fri 8/145:55 am
PWM
- SFO
2 stops11h 15m
Southwest
Mon 8/177:45 pm
SFO
- PWM
2 stops11h 10m
Southwest
Deal found 2/21![Southwest logo]()
$429
This Delta deal was found by Cheapflights users on 2/23. 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 4/105:23 am
PWM
- SFO
1 stop10h 26m
Delta
Mon 4/1310:35 pm
SFO
- PWM
2 stops10h 30m
Delta
Deal found 2/23![Delta logo]()
$433
This Southwest deal was found by Cheapflights users on 2/21. 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.
Sun 5/315:30 pm
PWM
- SFO
1 stop8h 50m
Southwest
Mon 6/86:10 pm
SFO
- PWM
2 stops12h 45m
Southwest
Deal found 2/21![Southwest logo]()
$459
This Delta deal was found by Cheapflights users on 2/23. 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 4/105:23 am
PWM
- SFO
1 stop10h 26m
Delta
Fri 4/1710:55 pm
SFO
- PWM
2 stops12h 16m
Delta
Deal found 2/23![Delta logo]()
$446
This Southwest deal was found by Cheapflights users on 2/22. 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.
Sun 3/85:30 am
PWM
- SFO
2 stops13h 40m
Southwest
Wed 3/119:35 am
SFO
- PWM
2 stops10h 30m
Southwest
Deal found 2/22![Southwest logo]()
$509
This Delta deal was found by Cheapflights users on 2/24. 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.
Sun 4/194:43 pm
PWM
- SFO
1 stop8h 43m
Delta
Fri 4/245:50 am
SFO
- PWM
1 stop7h 07m
Delta
Deal found 2/24![Delta logo]()
$499
This Southwest deal was found by Cheapflights users on 2/24. 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 3/262:50 pm
PWM
- SFO
2 stops12h 20m
Southwest
Thu 4/29:20 pm
SFO
- PWM
1 stop13h 55m
Southwest
Deal found 2/24![Southwest logo]()
$531
This Southwest deal was found by Cheapflights users on 2/24. 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 3/265:30 pm
PWM
- SFO
1 stop9h 10m
Southwest
Sun 3/2911:25 pm
SFO
- PWM
2 stops9h 30m
Southwest
Deal found 2/24![Southwest logo]()
$594
Last-minute flights from Portland to San FranciscoDiscover last-minute flight deals from Portland to San Francisco. Data last updated February 25, 2026 and is based on user searches.
Discover last-minute flight deals from Portland to San Francisco. Data last updated February 25, 2026 and is based on user searches.
This Delta deal was found by Cheapflights users on 2/23. 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.
Thu 3/124:48 pm
PWM
- SFO
1 stop8h 48m
Delta
Tue 3/1710:40 pm
SFO
- PWM
2 stops9h 24m
Delta
Deal found 2/23![Delta logo]()
$328
This Delta deal was found by Cheapflights users on 2/23. 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.
Thu 3/124:48 pm
PWM
- SFO
1 stop8h 48m
Delta
Mon 3/169:35 pm
SFO
- PWM
2 stops10h 29m
Delta
Deal found 2/23![Delta logo]()
$354
This American Airlines deal was found by Cheapflights users on 2/23. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/175:40 pm
PWM
- SFO
1 stop9h 04m
American Airlines
Tue 3/2411:49 pm
SFO
- PWM
1 stop9h 25m
American Airlines
Deal found 2/23![American Airlines logo]()
$285
This American Airlines deal was found by Cheapflights users on 2/23. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/175:40 pm
PWM
- SFO
1 stop9h 04m
American Airlines
Mon 3/2311:49 pm
SFO
- PWM
1 stop9h 25m
American Airlines
Deal found 2/23![American Airlines logo]()
$320
This Delta deal was found by Cheapflights users on 2/23. 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.
Tue 3/174:48 pm
PWM
- SFO
1 stop8h 48m
Delta
Mon 3/2310:40 pm
SFO
- PWM
2 stops12h 10m
Delta
Deal found 2/23![Delta logo]()
$353
This American Airlines deal was found by Cheapflights users on 2/25. 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.
Tue 3/315:40 pm
PWM
- SFO
1 stop9h 04m
American Airlines
Tue 4/145:45 am
SFO
- PWM
1 stop9h 53m
American Airlines
Deal found 2/25![American Airlines logo]()
$256
This Delta deal was found by Cheapflights users on 2/24. 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.
Tue 3/314:48 pm
PWM
- SFO
1 stop8h 48m
Delta
Tue 4/1410:30 pm
SFO
- PWM
2 stops14h 27m
Delta
Deal found 2/24![Delta logo]()
$262
This American Airlines deal was found by Cheapflights users on 2/23. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/315:40 pm
PWM
- SFO
1 stop9h 04m
American Airlines
Thu 4/1611:52 am
SFO
- PWM
1 stop8h 35m
American Airlines
Deal found 2/23![American Airlines logo]()
$356
One-way flights from Portland to San FranciscoSearch for one-way flight options from Portland to San Francisco. Find affordable one-way fares based on user searches. Data last updated February 25, 2026.
Search for one-way flight options from Portland to San Francisco. Find affordable one-way fares based on user searches. Data last updated February 25, 2026.
This American Airlines deal was found by Cheapflights users on 2/22. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/611:57 am
PWM
- SFO
1 stop11h 15m
American Airlines
Deal found 2/22![American Airlines logo]()
$126
This Delta deal was found by Cheapflights users on 2/24. 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.
Tue 3/174:48 pm
PWM
- SFO
1 stop8h 48m
Delta
Deal found 2/24![Delta logo]()
$129
This American Airlines deal was found by Cheapflights users on 2/24. 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.
Tue 3/245:40 pm
PWM
- SFO
1 stop9h 04m
American Airlines
Deal found 2/24![American Airlines logo]()
$131
This Delta deal was found by Cheapflights users on 2/22. 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.
Wed 5/66:30 am
PWM
- SFO
2 stops15h 37m
Delta
Deal found 2/22![Delta logo]()
$134
This American Airlines deal was found by Cheapflights users on 2/22. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/143:39 pm
PWM
- SFO
2 stops11h 20m
American Airlines
Deal found 2/22![American Airlines logo]()
$136
This Southwest deal was found by Cheapflights users on 2/23. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/165:40 am
PWM
- SFO
2 stops13h 40m
Southwest
Deal found 2/23![Southwest logo]()
$153
This American Airlines deal was found by Cheapflights users on 2/23. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/233:05 pm
PWM
- SFO
1 stop10h 58m
American Airlines
Deal found 2/23![American Airlines logo]()
$155
This Delta deal was found by Cheapflights users on 2/22. 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.
Fri 5/14:43 pm
PWM
- SFO
2 stops10h 11m
Delta
Deal found 2/22![Delta logo]()
$160
This American Airlines deal was found by Cheapflights users on 2/24. 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 6/102:24 pm
PWM
- SFO
1 stop11h 25m
American Airlines
Deal found 2/24![American Airlines logo]()
$169
This Southwest deal was found by Cheapflights users on 2/23. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/152:50 pm
PWM
- SFO
1 stop11h 30m
Southwest
Deal found 2/23![Southwest logo]()
$173
This Delta deal was found by Cheapflights users on 2/22. 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.
Mon 5/186:00 am
PWM
- SFO
1 stop8h 48m
Delta
Deal found 2/22![Delta logo]()
$179
Find 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 February 25, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $256 (American Airlines) |
One-way from | $126 (American Airlines) |
Popular in | December |
Cheapest in | September |
Average price | $552 |
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 February 25, 2026.
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
Tue 3/31
4:48 pm-11:59 pm
2 stops10h 11m
San Francisco
Tue 4/14
11:39 pm-3:57 pm
2 stops13h 18m
$267
PortlandSan Francisco
PWM - SFO
PWMSFO
Portland
Sat 4/11
5:40 am-2:25 pm
1 stop11h 45m
San Francisco
Sat 4/18
9:15 pm-12:05 pm
1 stop11h 50m
$424
PortlandSan Francisco
PWM - SFO
PWMSFO
Portland
Thu 5/7
6:00 am-3:56 pm
2 stops12h 56m
San Francisco
Sun 5/10
11:59 pm-12:00 pm
1 stop9h 01m
$429
PortlandSan Francisco
PWM - SFO
PWMSFO
Portland
Fri 8/14
5:55 am-2:10 pm
2 stops11h 15m
San Francisco
Mon 8/17
7:45 pm-9:55 am
2 stops11h 10m
$429
PortlandSan Francisco
PWM - SFO
PWMSFO
Portland
Fri 4/10
5:23 am-12:49 pm
1 stop10h 26m
San Francisco
Mon 4/13
10:35 pm-12:05 pm
2 stops10h 30m
$433
PortlandSan Francisco
PWM - SFO
PWMSFO
Portland
Fri 4/10
5:23 am-12:49 pm
1 stop10h 26m
San Francisco
Fri 4/17
10:55 pm-2:11 pm
2 stops12h 16m
$446
PortlandSan Francisco
PWM - SFO
PWMSFO
Portland
Sun 5/31
5:30 pm-11:20 pm
1 stop8h 50m
San Francisco
Mon 6/8
6:10 pm-9:55 am
2 stops12h 45m
$459
PortlandSan Francisco
PWM - SFO
PWMSFO
Portland
Sun 4/19
4:43 pm-10:26 pm
1 stop8h 43m
San Francisco
Fri 4/24
5:50 am-3:57 pm
1 stop7h 07m
$499
PortlandSan Francisco
PWM - SFO
PWMSFO
Portland
Sun 3/8
5:30 am-3:10 pm
2 stops13h 40m
San Francisco
Wed 3/11
9:35 am-11:05 pm
2 stops10h 30m
$509
PortlandSan Francisco
PWM - SFO
PWMSFO
Portland
Thu 3/26
2:50 pm-12:10 am
2 stops12h 20m
San Francisco
Thu 4/2
9:20 pm-2:15 pm
1 stop13h 55m
$531
Showing 1-10 of 21 results
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 February.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars |
- 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.
PWM-SFO
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 February 20, 2026.
The best time to book flights from Portland, Maine to San Francisco is 41 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 January 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.
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 February 25, 2026.
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.
Entertainment
7.5
Food
7.0
Overall
8.0
Crew
8.6
Boarding
8.1
Comfort
8.0
Reviews
1 / 20
8.0
ExcellentWalter,Aug 2025
OAK - SAN
Entertainment
7.5
Food
7.0
Overall
8.0
Crew
8.6
Boarding
8.1
Comfort
8.0
Reviews
1 / 20
8.0
ExcellentWalter,Aug 2025
OAK - SAN
Entertainment
7.5
Food
7.0
Overall
8.0
Crew
8.6
Boarding
8.1
Comfort
8.0
Reviews
1 / 20
8.0
ExcellentWalter,Aug 2025
OAK - SAN
Entertainment
7.5
Food
7.0
Overall
8.0
Crew
8.6
Boarding
8.1
Comfort
8.0
Reviews
1 / 20
8.0
ExcellentWalter,Aug 2025
OAK - SAN
Entertainment
7.5
Food
7.0
Overall
8.0
Crew
8.6
Boarding
8.1
Comfort
8.0
Reviews
1 / 20
8.0
ExcellentWalter,Aug 2025
OAK - SAN
Entertainment
7.5
Food
7.0
Overall
8.0
Crew
8.6
Boarding
8.1
Comfort
8.0
Reviews
1 / 20
8.0
ExcellentWalter,Aug 2025
OAK - SAN
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.
Traveling to a place near San Francisco?
Book flights to San Francisco if you plan to visit one of these locationsSouth San Francisco
Santa Cruz
Santa Clara
Livermore
Roseville
Watsonville
San Bruno
Daly City
Sunnyvale
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Turlock
San Carlos
San Ramon
Redwood City
Rancho Cordova
San Lorenzo
Davis
Hollister
Manteca
Union City
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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 February 25, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$238 | Average$394 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$268 | Average$526 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$272 | Average$477 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$276 | Average$400 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$320 | Average$455 | FlexibilityNo cancel fee | On-time62% |