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$239+ 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 1/24. Fares are subject to change and may not be available on all flights or dates of travel.
SFO — OPO
Jan 8 — Jan 151
Thu 1/8
Thu 1/15
1 adult, Economy
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Cheapflights Tip: The best prices from San Francisco to Porto are usually found in January or November, booked 89 days in advance, depart on a Thursday or Monday and return on a Wednesday

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 December 9, 2025.

This Mytrip deal was found by Cheapflights users on 12/8. 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.
Tue 12/308:25 amSFO - OPO
2 stops28h 50mMultiple Airlines
Fri 1/96:30 pmOPO - SFO
3 stops34h 52mMultiple Airlines
Deal found 12/8$1,044
This United Airlines deal was found by Cheapflights users on 12/8. 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 12/306:45 amSFO - OPO
2 stops20h 55mUnited Airlines
Fri 1/96:00 amOPO - SFO
2 stops23h 30mUnited Airlines
Deal found 12/8$1,156
This Delta deal was found by Cheapflights users on 12/9. 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 12/256:00 amSFO - OPO
2 stops32h 25mDelta
Tue 1/611:25 amOPO - SFO
1 stop34h 00mDelta
Deal found 12/9$1,641
This Kiwi.com deal was found by Cheapflights users on 12/9. 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.
Thu 12/254:40 pmSFO - OPO
1 stop21h 40mMultiple Airlines
Tue 1/69:05 pmOPO - SFO
1 stop26h 30mMultiple Airlines
Deal found 12/9$1,677
This Delta deal was found by Cheapflights users on 12/9. 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 12/2310:55 pmSFO - OPO
2 stops39h 30mDelta
Tue 1/611:25 amOPO - SFO
1 stop34h 00mDelta
Deal found 12/9$1,681
This Kiwi.com deal was found by Cheapflights users on 12/9. 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 12/249:40 pmSFO - OPO
1 stop18h 00mMultiple Airlines
Tue 1/67:15 pmOPO - SFO
2 stops35h 25mMultiple Airlines
Deal found 12/9$1,763

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 December 9, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$491
(Kiwi.com)

One-way from

$239
(Kiwi.com)

Popular in

July

Cheapest in

January

Average price

$925
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. 20% potential increase in price ($238 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($30 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
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 December 9, 2025.
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

Sun 3/8

5:40 pm-4:45 pm

1 stop16h 05m

Porto

Mon 3/16

5:35 pm-3:35 pm

1 stop29h 00m

$499

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Mon 3/9

5:40 pm-9:35 am

1 stop32h 55m

Porto

Fri 3/13

5:35 pm-3:35 pm

1 stop29h 00m

$509

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Fri 3/6

7:10 pm-5:00 pm

1 stop13h 50m

Porto

Sun 3/15

8:00 pm-3:35 pm

1 stop26h 35m

$578

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Thu 2/26

7:00 am-9:30 am

1 stop18h 30m

Porto

Thu 3/5

6:00 am-3:55 pm

1 stop17h 55m

$621

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Thu 2/26

9:24 am-9:30 am

2 stops16h 06m

Porto

Thu 3/5

6:00 am-8:10 pm

1 stop22h 10m

$629

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Sun 2/15

4:40 pm-10:45 pm

2 stops22h 05m

Porto

Sun 2/22

10:35 am-2:35 pm

2 stops36h 00m

$639

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Thu 3/5

4:40 pm-4:55 pm

1 stop16h 15m

Porto

Wed 3/11

4:10 pm-3:35 pm

2 stops30h 25m

$718

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Tue 3/3

4:40 pm-10:30 am

2 stops33h 50m

Porto

Wed 3/11

10:25 am-3:35 pm

1 stop36h 10m

$729

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Sun 2/15

6:50 pm-9:50 am

1 stop31h 00m

Porto

Sun 2/22

4:30 pm-4:45 pm

1 stop32h 15m

$732

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Tue 3/3

1:10 pm-9:55 am

1 stop36h 45m

Porto

Thu 3/12

4:10 pm-5:45 pm

1 stop32h 35m

$735

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/9

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 December.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy2 starsTrust Score*3 stars
AranGrantPrice Accuracy2 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*1 star
eDreamsPrice Accuracy3 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 eDreams to be most consistent on Cheapflights vs. eDreams Users can find the same prices on San Francisco-Porto flight deals on Cheapflights vs. eDreams >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 eDreams the most. eDreams 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 December 5, 2025.

To ensure you get the cheapest price possible for a flight from San Francisco to Porto, you should look to book at least 89 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, January is the cheapest month in which you can book a flight from San Francisco to Porto (average of $541). Flying from San Francisco to Porto in July is currently the most expensive (average of $806). 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 SFO to OPO?

Find hourly flight availability from San Francisco to Porto. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated December 9, 2025.

Unlike in the morning, when flights are generally more expensive, you can save up to 21% on flights from San Francisco to Porto by exploring options for tickets in the afternoon.

What is the cheapest day to fly from San Francisco to Porto?

Use this chart to determine the cheapest time to fly round-trip from San Francisco to Porto. Price data was last updated on December 16, 2024.

Travelers seeking maximum savings on their San Francisco to Porto flight should consider departing on Sunday afternoons when fares are most often at their lowest. Thursday at noon flights should be avoided if possible as fares are typically the most expensive at this time.

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 December 9, 2025.
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
1,808 reviews

Boarding

7.7

Entertainment

6.8

Crew

8.3

Food

7.1

Comfort

7.4

Overall

7.5

Reviews

1 / 20
10.0
Excellent

Leonardo,Aug 2025

AMS - ZRH

Amazing alternative from Europe to Hong Kong. Quick connection (even with a non-European passport) and friendly staff that helped me and my family.
SWISS
7.5
Good
1,808 reviews
SWISS
7.5
Good
1,808 reviews

Boarding

7.7

Entertainment

6.8

Crew

8.3

Food

7.1

Comfort

7.4

Overall

7.5

Reviews

1 / 20
10.0
Excellent

Leonardo,Aug 2025

AMS - ZRH

Amazing alternative from Europe to Hong Kong. Quick connection (even with a non-European passport) and friendly staff that helped me and my family.
United Airlines
7.4
Good
9,092 reviews
SWISS
7.5
Good
1,808 reviews

Boarding

7.7

Entertainment

6.8

Crew

8.3

Food

7.1

Comfort

7.4

Overall

7.5

Reviews

1 / 20
10.0
Excellent

Leonardo,Aug 2025

AMS - ZRH

Amazing alternative from Europe to Hong Kong. Quick connection (even with a non-European passport) and friendly staff that helped me and my family.
Air Canada
7.1
Good
10,513 reviews
SWISS
7.5
Good
1,808 reviews

Boarding

7.7

Entertainment

6.8

Crew

8.3

Food

7.1

Comfort

7.4

Overall

7.5

Reviews

1 / 20
10.0
Excellent

Leonardo,Aug 2025

AMS - ZRH

Amazing alternative from Europe to Hong Kong. Quick connection (even with a non-European passport) and friendly staff that helped me and my family.
TAP AIR PORTUGAL
7.1
Good
2,086 reviews
SWISS
7.5
Good
1,808 reviews

Boarding

7.7

Entertainment

6.8

Crew

8.3

Food

7.1

Comfort

7.4

Overall

7.5

Reviews

1 / 20
10.0
Excellent

Leonardo,Aug 2025

AMS - ZRH

Amazing alternative from Europe to Hong Kong. Quick connection (even with a non-European passport) and friendly staff that helped me and my family.
Lufthansa
6.8
Okay
7,619 reviews
SWISS
7.5
Good
1,808 reviews

Boarding

7.7

Entertainment

6.8

Crew

8.3

Food

7.1

Comfort

7.4

Overall

7.5

Reviews

1 / 20
10.0
Excellent

Leonardo,Aug 2025

AMS - ZRH

Amazing alternative from Europe to Hong Kong. Quick connection (even with a non-European passport) and friendly staff that helped me and my family.

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 13h 50m. Fly via Scandinavian Airlines, TAP AIR PORTUGAL, or Lufthansa to get the fastest option. San Francisco and Porto are separated by a distance of 5566 mi. This flight may include one or multiple stops.

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

    Iberia, at $520, was found to be the cheapest airline from San Francisco to Porto.Alternate airlines to your destination round-trip include Scandinavian Airlines and TAP AIR PORTUGAL. Users have found that Iberia is 42% 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 ($317), TAP AIR PORTUGAL ($383), 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, Festhalle, and Historisches Museum Frankfurt. Travelers on a layover in Frankfurt am Main can visit Römerberg, Festhalle, and Historisches Museum Frankfurt, by traveling 7.4 mi, 6.5 mi, and 7.3 mi, respectively after landing at Frankfurt am Main. Travelers can book a car rental at Frankfurt am Main for about $42 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, January is the cheapest month in which you can book a flight from San Francisco to Porto (average of $541). Flying from San Francisco to Porto in July is currently the most expensive (average of $806). 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
Aveiro
Arcos de Valdevez
Coimbra
Vila Nova de Gaia

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Alternative routes for San Francisco to Porto

See prices for flight routes from nearby airports that may be better suited for you.
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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 December 9, 2025.
AirlineCheapestAverageFlexibilityOn-time
Scandinavian AirlinesCheapest$527Average$781FlexibilityNo cancel feeOn-time77%
IberiaCheapest$540Average$1,116FlexibilityNo cancel feeOn-time77%
TAP AIR PORTUGALCheapest$574Average$859FlexibilityNo cancel feeOn-timeN/A
SWISSCheapest$636Average$951FlexibilityNo cancel feeOn-time79%
United AirlinesCheapest$652Average$1,029FlexibilityNo cancel feeOn-time69%
LufthansaCheapest$659Average$1,098FlexibilityNo cancel feeOn-time76%
DeltaCheapest$661Average$1,105FlexibilityNo cancel feeOn-timeN/A
KLMCheapest$673Average$879FlexibilityNo cancel feeOn-time75%
VuelingCheapest$756Average$949FlexibilityNo cancel feeOn-time88%
Air CanadaCheapest$776Average$1,051FlexibilityNo cancel feeOn-time67%

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