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$255+ Cheap flights from San Francisco (SFO) to Porto (OPO)

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 4/19. Fares are subject to change and may not be available on all flights or dates of travel.
SFO — OPO
Mar 21 — Mar 281
Sat 3/21
Sat 3/28
1 adult, Economy
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Cheap flight deals from San Francisco to Porto

Cheapest flights from San Francisco to Porto
Explore the most affordable flight options available from San Francisco to Porto. Find the lowest fares from popular airlines and budget airlines, with prices last updated on February 19, 2026.

This Kiwi.com deal was found by Cheapflights users on 2/18. 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.
Sun 3/85:40 pm
SFO
-
OPO
1 stop16h 05m
Scandinavian Airlines
Mon 3/165:35 pm
OPO
-
SFO
1 stop29h 00m
Scandinavian Airlines
Deal found 2/18$494
This Trip.com deal was found by Cheapflights users on 2/18. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 3/85:40 pm
SFO
-
OPO
1 stop16h 05m
Scandinavian Airlines
Mon 3/235:35 pm
OPO
-
SFO
1 stop29h 00m
Scandinavian Airlines
Deal found 2/18$507
This Gotogate deal was found by Cheapflights users on 2/15. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/184:45 pm
SFO
-
OPO
1 stop34h 15m
Scandinavian Airlines
Sat 5/99:30 am
OPO
-
SFO
1 stop37h 10m
Scandinavian Airlines
Deal found 2/15$548
This Gotogate deal was found by Cheapflights users on 2/15. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/184:45 pm
SFO
-
OPO
1 stop34h 15m
Scandinavian Airlines
Sun 5/36:20 pm
OPO
-
SFO
1 stop28h 20m
Scandinavian Airlines
Deal found 2/15$556
This Mytrip deal was found by Cheapflights users on 2/18. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 2/234:35 pm
SFO
-
OPO
2 stops18h 45m
Multiple Airlines
Tue 3/105:35 pm
OPO
-
SFO
2 stops28h 55m
Multiple Airlines
Deal found 2/18$576
This KAYAK deal was found by Cheapflights users on 2/18. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 3/85:40 pm
SFO
-
OPO
1 stop16h 05m
Scandinavian Airlines
Wed 3/1810:25 am
OPO
-
SFO
1 stop36h 10m
Scandinavian Airlines
Deal found 2/18$581
This Kiwi.com deal was found by Cheapflights users on 2/18. 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.
Tue 3/107:55 pm
SFO
-
OPO
1 stop18h 35m
Multiple Airlines
Wed 3/188:15 am
OPO
-
SFO
1 stop19h 55m
Multiple Airlines
Deal found 2/18$619
This Gotogate deal was found by Cheapflights users on 2/16. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/184:45 pm
SFO
-
OPO
1 stop34h 15m
Scandinavian Airlines
Sat 5/29:30 am
OPO
-
SFO
1 stop37h 10m
Scandinavian Airlines
Deal found 2/16$620

Find flight deals from San Francisco to Porto

Discover tips and strategies to find the most affordable flight options for your journey from San Francisco (SFO) to Porto (OPO). 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 19, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$494
(Kiwi.com)

One-way from

$255
(Kiwi.com)

Popular in

June

Cheapest in

February

Average price

$676
Provider with most accurate pricing for San Francisco-Porto flight deals.
Search Deals
Provider most trusted by Cheapflights users for San Francisco-Porto flights.
Search Deals
From San Francisco to Porto
Search Deals
One-way flight from San Francisco to Porto
Search Deals
Highest demand for flights based on searches. 22% potential increase in price ($258 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($32 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in February 2026
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from San Francisco to Porto 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 19, 2026.
Use the filters below to find and compare flights from San Francisco to Porto that are best for you.

Fly from

San Francisco

Fly to

Porto

Route

Depart

Return

Price

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Sat 4/18

4:45 pm-11:00 am

1 stop34h 15m

Porto

Sun 5/3

6:20 pm-2:40 pm

1 stop28h 20m

$556

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Thu 4/2

4:45 pm-5:05 pm

1 stop16h 20m

Porto

Sun 4/12

6:20 pm-12:27 am

2 stops38h 07m

$632

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Thu 4/16

6:45 pm-11:30 pm

1 stop20h 45m

Porto

Tue 4/28

4:40 pm-4:40 pm

1 stop32h 00m

$662

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Wed 4/22

6:45 pm-9:45 am

1 stop31h 00m

Porto

Mon 5/4

4:40 pm-10:50 am

1 stop26h 10m

$704

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Wed 3/11

7:50 pm-9:55 am

1 stop31h 05m

Porto

Wed 3/18

4:10 pm-5:45 pm

1 stop32h 35m

$743

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Sat 4/11

4:45 pm-5:40 pm

1 stop16h 55m

Porto

Sat 4/18

9:30 am-2:40 pm

1 stop37h 10m

$765

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Tue 3/17

8:25 am-6:30 pm

3 stops27h 05m

Porto

Tue 3/31

6:00 pm-9:30 pm

3 stops35h 30m

$767

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Tue 4/14

9:49 am-3:25 pm

2 stops21h 36m

Porto

Tue 4/28

5:00 am-11:45 am

1 stop14h 45m

$783

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Tue 3/17

4:40 pm-10:30 am

1 stop34h 50m

Porto

Tue 3/31

4:20 pm-11:45 am

1 stop27h 25m

$830

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Wed 4/22

5:00 am-9:45 am

2 stops20h 45m

Porto

Mon 5/4

6:00 am-8:00 pm

1 stop22h 00m

$831

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/15

Showing 1-10 of 17 results
1
2

Compare providers for flights from San Francisco to Porto

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 San Francisco to Porto in February.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
AranGrantPrice Accuracy2 starsTrust Score*2 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
OvagoPrice Accuracy2 starsTrust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on San Francisco-Porto flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on San Francisco-Porto flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from San Francisco-Porto flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on San Francisco-Porto 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 San Francisco-Porto 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 San Francisco to Porto

Have a flexible travel schedule? Discover the best time to fly to Porto from San Francisco 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 San Francisco to Porto

How far ahead should I book a flight from San Francisco to Porto?

Use this chart to determine the optimal time to book a round-trip flight from San Francisco to Porto. Price data was last updated on February 18, 2026.

To ensure you get the cheapest price possible for a flight from San Francisco to Porto, you should look to book at least 83 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.

What is the cheapest month to book a flight from San Francisco to Porto?

Currently, April is the cheapest month in which you can book a flight from San Francisco to Porto (average of $431). Flying from San Francisco to Porto in June is currently the most expensive (average of $876). 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 Porto

Get insights into the airlines that provide service to Porto. 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 Porto. Reviews last updated February 19, 2026.
Read reviews from past customers who have flown SWISS, United Airlines, and Air Canada from San Francisco to Porto. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
SWISS
7.5
Good
1,878 reviews

Overall

7.5

Entertainment

6.8

Boarding

7.7

Comfort

7.4

Food

7.1

Crew

8.3

Reviews

1 / 20
2.0
Mediocre

Joanne,Sep 2025

OPO - ZRH

The seats were very cramped, even though I paid for an upgraded seat. The seats were also hard, and needed new padding. This made is made it very challenging for this 11 hour flight. The foot was alright. The crew were excellent, and the movie selection was very good. The experience was so challenging what my husband says he does not want to fly to Europe any more.
SWISS
7.5
Good
1,878 reviews
SWISS
7.5
Good
1,878 reviews

Overall

7.5

Entertainment

6.8

Boarding

7.7

Comfort

7.4

Food

7.1

Crew

8.3

Reviews

1 / 20
2.0
Mediocre

Joanne,Sep 2025

OPO - ZRH

The seats were very cramped, even though I paid for an upgraded seat. The seats were also hard, and needed new padding. This made is made it very challenging for this 11 hour flight. The foot was alright. The crew were excellent, and the movie selection was very good. The experience was so challenging what my husband says he does not want to fly to Europe any more.
United Airlines
7.4
Good
9,323 reviews
SWISS
7.5
Good
1,878 reviews

Overall

7.5

Entertainment

6.8

Boarding

7.7

Comfort

7.4

Food

7.1

Crew

8.3

Reviews

1 / 20
2.0
Mediocre

Joanne,Sep 2025

OPO - ZRH

The seats were very cramped, even though I paid for an upgraded seat. The seats were also hard, and needed new padding. This made is made it very challenging for this 11 hour flight. The foot was alright. The crew were excellent, and the movie selection was very good. The experience was so challenging what my husband says he does not want to fly to Europe any more.
Air Canada
7.1
Good
10,732 reviews
SWISS
7.5
Good
1,878 reviews

Overall

7.5

Entertainment

6.8

Boarding

7.7

Comfort

7.4

Food

7.1

Crew

8.3

Reviews

1 / 20
2.0
Mediocre

Joanne,Sep 2025

OPO - ZRH

The seats were very cramped, even though I paid for an upgraded seat. The seats were also hard, and needed new padding. This made is made it very challenging for this 11 hour flight. The foot was alright. The crew were excellent, and the movie selection was very good. The experience was so challenging what my husband says he does not want to fly to Europe any more.
TAP AIR PORTUGAL
7.1
Good
2,144 reviews
SWISS
7.5
Good
1,878 reviews

Overall

7.5

Entertainment

6.8

Boarding

7.7

Comfort

7.4

Food

7.1

Crew

8.3

Reviews

1 / 20
2.0
Mediocre

Joanne,Sep 2025

OPO - ZRH

The seats were very cramped, even though I paid for an upgraded seat. The seats were also hard, and needed new padding. This made is made it very challenging for this 11 hour flight. The foot was alright. The crew were excellent, and the movie selection was very good. The experience was so challenging what my husband says he does not want to fly to Europe any more.
Lufthansa
6.8
Okay
7,789 reviews
SWISS
7.5
Good
1,878 reviews

Overall

7.5

Entertainment

6.8

Boarding

7.7

Comfort

7.4

Food

7.1

Crew

8.3

Reviews

1 / 20
2.0
Mediocre

Joanne,Sep 2025

OPO - ZRH

The seats were very cramped, even though I paid for an upgraded seat. The seats were also hard, and needed new padding. This made is made it very challenging for this 11 hour flight. The foot was alright. The crew were excellent, and the movie selection was very good. The experience was so challenging what my husband says he does not want to fly to Europe any more.

Related info for your journey

Find useful and relevant information for your journey from San Francisco to Porto. 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 San Francisco to Porto?

    There are many flights that can get you from San Francisco to Porto in 16h 05m. Fly via Scandinavian Airlines to get the fastest option. San Francisco and Porto are separated by a distance of 5566 mi.

  • What are the cheapest airlines flying from San Francisco to Porto round-trip?

    TAP AIR PORTUGAL, at $431, was found to be the cheapest airline from San Francisco to Porto.Alternate airlines to your destination round-trip include Scandinavian Airlines and Lufthansa. Users have found that TAP AIR PORTUGAL is 52% cheaper than the other options available to this destination.

  • What are the cheapest airlines to fly from San Francisco to Porto one-way?

    The cheapest airlines for a one-way flight from San Francisco to Porto are Iberia ($293), TAP AIR PORTUGAL ($382), and United Airlines ($408).

  • Where are the most common layover locations when flying from San Francisco to Porto?

    Of the flights from San Francisco to Porto that have layovers, most of them stop in Frankfurt am Main.

  • What are some popular things to do or see while on a layover in Frankfurt am Main?

    The majority of Frankfurt am Main visitors spend their time at Römerberg, Oper Frankfurt, and Konstablerwache. Travelers on a layover in Frankfurt am Main can visit Römerberg, Oper Frankfurt, and Konstablerwache, by traveling 7.4 mi, 7.0 mi, and 7.7 mi, respectively after landing at Frankfurt am Main. Travelers can book a car rental at Frankfurt am Main for about $48 per day to make their sightseeing more efficient.

  • Where are the least popular layover locations for San Francisco to Porto flights?

    Of the flights from San Francisco to Porto that have layovers, the fewest flights stop in Lisbon.

  • Can I find deals for flights from San Francisco to Porto that include hotel bookings?

    Yes. In addition to deals on San Francisco to Porto flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from San Francisco to Porto?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from San Francisco to Porto.

  • Can I find deals for business class flights from San Francisco to Porto?

    Yes. Cheapflights offers flight deals from San Francisco to Porto 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 San Francisco to Porto?

    Currently, April is the cheapest month in which you can book a flight from San Francisco to Porto (average of $431). Flying from San Francisco to Porto in June is currently the most expensive (average of $876). 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 Porto?

Book flights to Porto if you plan to visit one of these locations
Vila Nova de Gaia
Aveiro
Arcos de Valdevez
Coimbra

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Top 10 airlines flying from San Francisco to Porto

Discover the top 10 airlines that operate flights from San Francisco to Porto. 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 19, 2026.
AirlineCheapestAverageFlexibilityOn-time
TAP AIR PORTUGALCheapest$431Average$796FlexibilityNo cancel feeOn-timeN/A
Scandinavian AirlinesCheapest$480Average$612FlexibilityNo cancel feeOn-time77%
LufthansaCheapest$625Average$1,048FlexibilityNo cancel feeOn-time76%
SWISSCheapest$626Average$944FlexibilityNo cancel feeOn-time79%
IberiaCheapest$660Average$1,036FlexibilityNo cancel feeOn-time77%
DeltaCheapest$661Average$1,105FlexibilityNo cancel feeOn-timeN/A
KLMCheapest$673Average$879FlexibilityNo cancel feeOn-time75%
United AirlinesCheapest$675Average$1,038FlexibilityNo cancel feeOn-time69%
Air CanadaCheapest$776Average$1,112FlexibilityNo cancel feeOn-time67%
American AirlinesCheapest$1,000Average$1,223FlexibilityNo cancel feeOn-time71%

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