$169+ 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 9/15. Fares are subject to change and may not be available on all flights or dates of travel.
PWM — SFO
Sep 24 — Oct 11
Round-trip
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
We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.3. Compare prices and book
Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.Cheapflights Tip: The best prices from Portland to San Francisco are usually found in January or October, booked 40 days in advance, depart on a Tuesday or Monday and return on a Monday
Cheap flight deals from Portland to San Francisco
Cheapest
Best
Last-minute
One-way
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 August 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 August 25, 2026.
This United Airlines deal was found by Cheapflights users on 8/21. 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.
Wed 9/234:57 pm -
1 stop9h 51m
Mon 9/2811:10 pm -
1 stop7h 52m
Deal found 8/21![United Airlines logo]()
$337
This Southwest deal was found by Cheapflights users on 8/21. 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.
Wed 9/235:45 am -
2 stops11h 55m
Sat 9/2610:30 pm -
1 stop9h 05m
Deal found 8/21![Southwest logo]()
$342
This Delta deal was found by Cheapflights users on 8/21. 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.
Wed 9/236:02 am -
2 stops12h 52m
Sat 9/267:20 am -
2 stops13h 36m
Deal found 8/21![Delta logo]()
$347
This United Airlines deal was found by Cheapflights users on 8/20. 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.
Sun 9/207:30 am -
Nonstop6h 35m
Sat 9/266:45 am -
1 stop9h 39m
Deal found 8/20![United Airlines logo]()
$348
This United Airlines deal was found by Cheapflights users on 8/21. 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.
Wed 9/234:57 pm -
1 stop9h 51m
Sun 9/2711:30 pm -
1 stop8h 10m
Deal found 8/21![United Airlines logo]()
$358
This Delta deal was found by Cheapflights users on 8/20. 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 9/254:20 pm -
1 stop11h 14m
Sat 9/268:59 pm -
2 stops10h 46m
Deal found 8/20![Delta logo]()
$363
This Delta deal was found by Cheapflights users on 8/21. 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.
Wed 9/236:02 am -
2 stops12h 52m
Sun 9/276:43 pm -
2 stops13h 02m
Deal found 8/21![Delta logo]()
$368
This United Airlines deal was found by Cheapflights users on 8/23. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/17:25 pm -
1 stop8h 34m
Mon 10/511:10 pm -
1 stop7h 52m
Deal found 8/23![United Airlines logo]()
$379
This Southwest deal was found by Cheapflights users on 8/21. 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 10/35:35 am -
1 stop9h 45m
Tue 10/66:55 am -
2 stops12h 40m
Deal found 8/21![Southwest logo]()
$380
This Southwest deal was found by Cheapflights users on 8/21. 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.
Wed 9/235:45 am -
1 stop8h 50m
Sun 9/277:50 pm -
2 stops11h 00m
Deal found 8/21![Southwest logo]()
$383
This Southwest deal was found by Cheapflights users on 8/24. 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.
Wed 10/216:00 pm -
1 stop8h 35m
Fri 10/309:55 am -
2 stops11h 00m
Deal found 8/24![Southwest logo]()
$384
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 August 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 August 25, 2026.
This Southwest deal was found by Cheapflights users on 8/20. 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 11/175:15 am -
1 stop11h 35m
Sun 11/229:25 pm -
1 stop10h 05m
Deal found 8/20![Southwest logo]()
$358
This United Airlines deal was found by Cheapflights users on 8/20. 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.
Sun 9/67:30 am -
Nonstop6h 35m
Sat 9/195:00 am -
1 stop9h 54m
Deal found 8/20![United Airlines logo]()
$388
This Delta deal was found by Cheapflights users on 8/23. 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 10/12:10 pm -
2 stops10h 24m
Mon 10/511:30 pm -
2 stops14h 17m
Deal found 8/23![Delta logo]()
$389
This Southwest deal was found by Cheapflights users on 8/22. 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.
Sat 10/35:35 am -
1 stop9h 45m
Tue 10/66:55 am -
2 stops12h 40m
Deal found 8/22![Southwest logo]()
$390
This Delta deal was found by Cheapflights users on 8/20. 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 9/66:00 am -
1 stop9h 19m
Sat 9/196:00 am -
2 stops12h 00m
Deal found 8/20![Delta logo]()
$403
This Delta deal was found by Cheapflights users on 8/24. 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 10/21:59 pm -
2 stops12h 58m
Sun 10/45:38 pm -
2 stops14h 07m
Deal found 8/24![Delta logo]()
$410
This Southwest deal was found by Cheapflights users on 8/23. 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.
Thu 10/155:20 am -
2 stops11h 05m
Fri 10/169:35 pm -
1 stop9h 10m
Deal found 8/23![Southwest logo]()
$422
This United Airlines deal was found by Cheapflights users on 8/22. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/47:50 am -
Nonstop6h 35m
Sun 10/1110:42 pm -
1 stop8h 59m
Deal found 8/22![United Airlines logo]()
$479
This Southwest deal was found by Cheapflights users on 8/22. 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.
Sat 9/125:40 am -
2 stops13h 10m
Fri 9/255:35 am -
1 stop13h 00m
Deal found 8/22![Southwest logo]()
$459
Last-minute flights from Portland to San FranciscoDiscover last-minute flight deals from Portland to San Francisco. Data last updated August 25, 2026 and is based on user searches.
Discover last-minute flight deals from Portland to San Francisco. Data last updated August 25, 2026 and is based on user searches.
This United Airlines deal was found by Cheapflights users on 8/20. 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.
Sun 9/67:30 am -
Nonstop6h 35m
Sat 9/195:00 am -
1 stop9h 54m
Deal found 8/20![United Airlines logo]()
$388
This American Airlines deal was found by Cheapflights users on 8/22. 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.
Sat 9/125:38 pm -
1 stop9h 18m
Tue 9/157:40 am -
1 stop8h 58m
Deal found 8/22![American Airlines logo]()
$379
This Delta deal was found by Cheapflights users on 8/22. 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.
Sat 9/126:02 am -
2 stops12h 47m
Tue 9/1511:35 am -
1 stop9h 21m
Deal found 8/22![Delta logo]()
$384
This United Airlines deal was found by Cheapflights users on 8/20. 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.
Sun 9/207:30 am -
Nonstop6h 35m
Sat 9/266:45 am -
1 stop9h 39m
Deal found 8/20![United Airlines logo]()
$348
This United Airlines deal was found by Cheapflights users on 8/21. 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.
Wed 9/234:57 pm -
1 stop9h 51m
Mon 9/2811:10 pm -
1 stop7h 52m
Deal found 8/21![United Airlines logo]()
$337
This Southwest deal was found by Cheapflights users on 8/21. 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.
Wed 9/235:45 am -
2 stops11h 55m
Sat 9/2610:30 pm -
1 stop9h 05m
Deal found 8/21![Southwest logo]()
$342
This Delta deal was found by Cheapflights users on 8/21. 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.
Wed 9/236:02 am -
2 stops12h 52m
Sat 9/267:20 am -
2 stops13h 36m
Deal found 8/21![Delta logo]()
$347
This United Airlines deal was found by Cheapflights users on 8/21. 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.
Wed 9/234:57 pm -
1 stop9h 51m
Sun 9/2711:30 pm -
1 stop8h 10m
Deal found 8/21![United Airlines logo]()
$358
This Delta deal was found by Cheapflights users on 8/21. 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.
Wed 9/236:02 am -
2 stops12h 52m
Sun 9/276:43 pm -
2 stops13h 02m
Deal found 8/21![Delta logo]()
$368
This Southwest deal was found by Cheapflights users on 8/21. 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.
Wed 9/235:45 am -
1 stop8h 50m
Sun 9/277:50 pm -
2 stops11h 00m
Deal found 8/21![Southwest logo]()
$383
This Delta deal was found by Cheapflights users on 8/20. 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 9/254:20 pm -
1 stop11h 14m
Sat 9/268:59 pm -
2 stops10h 46m
Deal found 8/20![Delta logo]()
$363
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 August 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 August 25, 2026.
This Delta deal was found by Cheapflights users on 8/20. 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 9/156:02 am -
1 stop9h 18m
Deal found 8/20![Delta logo]()
$169
This Delta deal was found by Cheapflights users on 8/21. 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.
Wed 9/166:02 am -
2 stops12h 52m
Deal found 8/21![Delta logo]()
$174
This American Airlines deal was found by Cheapflights users on 8/24. 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 9/157:00 am -
1 stop11h 39m
Deal found 8/24![American Airlines logo]()
$190
This Kiwi.com deal was found by Cheapflights users on 8/21. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/307:00 am -
3 stops30h 22m
Deal found 8/21![Multiple Airlines logo]()
$193
This Southwest deal was found by Cheapflights users on 8/19. 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 10/105:35 am -
2 stops12h 00m
Deal found 8/19![Southwest logo]()
$195
This Kiwi.com deal was found by Cheapflights users on 8/19. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/116:00 am -
2 stops16h 48m
Deal found 8/19![Multiple Airlines logo]()
$197
This Southwest deal was found by Cheapflights users on 8/21. 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 9/155:45 am -
2 stops11h 55m
Deal found 8/21![Southwest logo]()
$205
This Kiwi.com deal was found by Cheapflights users on 8/20. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/237:00 am -
3 stops30h 22m
Deal found 8/20![Multiple Airlines logo]()
$206
This Delta deal was found by Cheapflights users on 8/22. 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 10/142:09 pm -
1 stop11h 50m
Deal found 8/22![Delta logo]()
$210
This Southwest deal was found by Cheapflights users on 8/24. 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.
Fri 10/165:20 am -
2 stops10h 10m
Deal found 8/24![Southwest logo]()
$212
This American Airlines deal was found by Cheapflights users on 8/24. 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.
Fri 10/164:23 pm -
1 stop9h 44m
Deal found 8/24![American Airlines logo]()
$214
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 August 25, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $337 (United Airlines) |
One-way from | $169 (Delta) |
Popular in | July |
Cheapest in | January |
Average price | $553 |
Good round-trip deal | $469 or less |
Good one-way deal | $308 or less |
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 7,457,451 searches. Data last updated August 25, 2026.
Use the filters below to find and compare flights from Portland to San Francisco that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
PortlandSan Francisco
PWM Portland - SFO San Francisco
PWMSFO
Portland
Tue 11/17
5:15 am-1:50 pm
1 stop11h 35m
San Francisco
Sun 11/22
9:25 pm-10:30 am
1 stop10h 05m
$358
PortlandSan Francisco
PWM Portland - SFO San Francisco
PWMSFO
Portland
Sun 9/6
7:30 am-11:05 am
Nonstop6h 35m
San Francisco
Sat 9/19
5:00 am-5:54 pm
1 stop9h 54m
$388
PortlandSan Francisco
PWM Portland - SFO San Francisco
PWMSFO
Portland
Thu 10/1
2:10 pm-9:34 pm
2 stops10h 24m
San Francisco
Mon 10/5
11:30 pm-4:47 pm
2 stops14h 17m
$389
PortlandSan Francisco
PWM Portland - SFO San Francisco
PWMSFO
Portland
Sat 10/3
5:35 am-12:20 pm
1 stop9h 45m
San Francisco
Tue 10/6
6:55 am-10:35 pm
2 stops12h 40m
$390
PortlandSan Francisco
PWM Portland - SFO San Francisco
PWMSFO
Portland
Sun 9/6
6:00 am-12:19 pm
1 stop9h 19m
San Francisco
Sat 9/19
6:00 am-9:00 pm
2 stops12h 00m
$403
PortlandSan Francisco
PWM Portland - SFO San Francisco
PWMSFO
Portland
Fri 10/2
1:59 pm-11:57 pm
2 stops12h 58m
San Francisco
Sun 10/4
5:38 pm-10:45 am
2 stops14h 07m
$410
PortlandSan Francisco
PWM Portland - SFO San Francisco
PWMSFO
Portland
Thu 10/15
5:20 am-1:25 pm
2 stops11h 05m
San Francisco
Fri 10/16
9:35 pm-9:45 am
1 stop9h 10m
$422
PortlandSan Francisco
PWM Portland - SFO San Francisco
PWMSFO
Portland
Sat 9/12
5:40 am-3:50 pm
2 stops13h 10m
San Francisco
Fri 9/25
5:35 am-9:35 pm
1 stop13h 00m
$459
Quickest round-trip
PortlandSan Francisco
PWM Portland - SFO San Francisco
PWMSFO
Portland
Sun 10/4
7:50 am-11:25 am
Nonstop6h 35m
San Francisco
Sun 10/11
10:42 pm-10:41 am
1 stop8h 59m
$479
Cheapest one-way
PortlandSan Francisco
PWM Portland - SFO San Francisco
PWMSFO
Portland
Tue 11/10
3:23 pm-11:09 pm
1 stop10h 46m
$169
Showing 1-10 of 19 resultsSorted by cheapest first
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 August.
| 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?
The best time to book flights from Portland, Maine to San Francisco is 39 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 $415). Flying from Portland, Maine to San Francisco in July is currently the most expensive (average of $652). 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.
How much does it cost to fly round-trip from Portland, Maine to San Francisco?
Airfare is below average for this route at the moment.
Portland, Maine to San Francisco flights typically cost between $392 and $793 in September.The cheapest round-trip price found within the last 5 days was $337 on United Airlines (Sep 23-Sep 28).
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 August 25, 2026.
See what other customers who have flown with Southwest,Delta, andUnited 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.
Food
7.0
Crew
8.6
Overall
8.0
Boarding
8.1
Comfort
8.0
Entertainment
7.5
Reviews
1 / 20
10.0
ExcellentWalter,May 2026
LAS - BUR
Food
7.0
Crew
8.6
Overall
8.0
Boarding
8.1
Comfort
8.0
Entertainment
7.5
Reviews
1 / 20
10.0
ExcellentWalter,May 2026
LAS - BUR
Food
7.0
Crew
8.6
Overall
8.0
Boarding
8.1
Comfort
8.0
Entertainment
7.5
Reviews
1 / 20
10.0
ExcellentWalter,May 2026
LAS - BUR
Food
7.0
Crew
8.6
Overall
8.0
Boarding
8.1
Comfort
8.0
Entertainment
7.5
Reviews
1 / 20
10.0
ExcellentWalter,May 2026
LAS - BUR
Food
7.0
Crew
8.6
Overall
8.0
Boarding
8.1
Comfort
8.0
Entertainment
7.5
Reviews
1 / 20
10.0
ExcellentWalter,May 2026
LAS - BUR
Food
7.0
Crew
8.6
Overall
8.0
Boarding
8.1
Comfort
8.0
Entertainment
7.5
Reviews
1 / 20
10.0
ExcellentWalter,May 2026
LAS - BUR
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 Clara
Santa Cruz
Walnut Creek
Emeryville
San Bruno
Roseville
Rancho Cordova
Fairfield
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Vallejo
Cupertino
Newark
Hayward
San Ramon
Redwood City
Manteca
San Carlos
Turlock
Davis
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Portland and San Francisco flights
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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 7,457,451 searches. Data last updated August 25, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$236 | Average$345 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$256 | Average$455 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$268 | Average$544 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$276 | Average$501 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$416 | Average$558 | FlexibilityNo cancel fee | On-time63% |