Porto

$283+ 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 8/19. Fares are subject to change and may not be available on all flights or dates of travel.
SFO — OPO
jul. 8 — jul. 151
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Cheapflights Tip: The best prices from San Francisco to Porto are usually found in January or February, booked 31 days in advance, depart on a Thursday or Monday and return on a Wednesday

Cheap 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 julio 3, 2025.

Round-trip from

$576
(oojo)

One-way from

$283
(Kiwi.com)

Popular in

June

Cheapest in

January

Average price

$1,217
From San Francisco to Porto
One-way flight from San Francisco to Porto
Highest demand for flights based on searches. 19% potential increase in price ($228 potential increase over avg. RT price).
Cheapest flight prices on average. 2% potential price decrease ($28 potential savings vs. average RT price).
Average for round-trip flights in July 2025

Find 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 julio 3, 2025.

This Scandinavian Airlines deal was found by Cheapflights users on 7/2. 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 Scandinavian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 11/134:40 pmSFO - OPO
1 stop16h 15mScandinavian Airlines
lun. 11/245:35 pmOPO - SFO
2 stops34h 46mScandinavian Airlines
Deal found 7/2$553
This oojo deal was found by Cheapflights users on 7/2. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 10/144:20 pmSFO - OPO
1 stop22h 25mTAP AIR PORTUGAL
mié. 10/229:15 pmOPO - SFO
1 stop25h 15mTAP AIR PORTUGAL
Deal found 7/2$576
This United Airlines deal was found by Cheapflights users on 7/2. 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.
lun. 11/108:38 amSFO - OPO
2 stops16h 52mUnited Airlines
mar. 11/2512:30 pmOPO - SFO
1 stop15h 40mUnited Airlines
Deal found 7/2$584
This Mytrip deal was found by Cheapflights users on 7/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 8/188:20 amSFO - OPO
2 stops22h 45mMultiple Airlines
mié. 8/277:15 amOPO - SFO
2 stops20h 42mMultiple Airlines
Deal found 7/1$597
This SWISS deal was found by Cheapflights users on 7/2. 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 SWISS is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 10/227:30 pmSFO - OPO
1 stop15h 00mSWISS
mar. 11/47:25 pmOPO - SFO
1 stop29h 00mSWISS
Deal found 7/2$603
This Lufthansa deal was found by Cheapflights users on 7/2. 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 Lufthansa is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 10/229:05 pmSFO - OPO
1 stop18h 15mLufthansa
jue. 11/66:00 amOPO - SFO
2 stops24h 56mLufthansa
Deal found 7/2$608
This Delta deal was found by Cheapflights users on 7/2. 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.
mar. 10/211:00 pmSFO - OPO
2 stops18h 30mDelta
mié. 11/511:45 amOPO - SFO
1 stop33h 50mDelta
Deal found 7/2$630
This Air Canada deal was found by Cheapflights users on 7/2. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 11/18:25 amSFO - OPO
2 stops20h 25mAir Canada
vie. 11/146:15 amOPO - SFO
2 stops22h 19mAir Canada
Deal found 7/2$663

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 julio 3, 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

jue. 11/13

4:40 pm-4:55 pm

1 stop16h 15m

Porto

lun. 11/24

5:35 pm-8:21 pm

2 stops34h 46m

$553

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

mar. 10/14

4:20 pm-10:45 pm

1 stop22h 25m

Porto

mié. 10/22

10:25 pm-2:30 pm

1 stop24h 05m

$576

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

lun. 11/10

8:38 am-9:30 am

2 stops16h 52m

Porto

mar. 11/25

12:30 pm-8:10 pm

1 stop15h 40m

$584

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

lun. 8/18

8:20 am-3:05 pm

2 stops22h 45m

Porto

mié. 8/27

7:15 am-7:57 pm

2 stops20h 42m

$597

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

mié. 10/22

7:30 pm-6:30 pm

1 stop15h 00m

Porto

mar. 11/4

7:25 pm-4:25 pm

1 stop29h 00m

$603

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

mié. 10/22

9:05 pm-11:20 pm

1 stop18h 15m

Porto

jue. 11/6

6:00 am-10:56 pm

2 stops24h 56m

$608

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

mar. 10/21

1:00 pm-3:30 pm

2 stops18h 30m

Porto

mié. 11/5

11:45 am-1:35 pm

1 stop33h 50m

$630

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

sáb. 11/1

8:25 am-11:50 am

2 stops20h 25m

Porto

vie. 11/14

6:15 am-8:34 pm

2 stops22h 19m

$663

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

mar. 8/19

6:45 pm-6:50 am

3 stops28h 05m

$283

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

dom. 7/27

8:10 pm-9:20 pm

1 stop17h 10m

$392

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/1

Showing 1-10 of 15 results
1
2

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 June 27, 2025.

To ensure you get the cheapest price possible for a flight from San Francisco to Porto, you should look to book at least 31 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 $523). Flying from San Francisco to Porto in June is currently the most expensive (average of $1,033). 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 julio 3, 2025.

Unlike in the morning, when flights are generally more expensive, you can save up to 22% 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 julio 3, 2025.
Read reviews from past customers who have flown Delta, KLM, and SWISS 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.
8.0
Very good

Boarding

8.2

Crew

8.5

Overall

8.0

Entertainment

7.9

Comfort

7.9

Food

7.3

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
8.0
Very good
8.0
Very good

Boarding

8.2

Crew

8.5

Overall

8.0

Entertainment

7.9

Comfort

7.9

Food

7.3

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
8.0
Very good

Boarding

8.2

Crew

8.5

Overall

8.0

Entertainment

7.9

Comfort

7.9

Food

7.3

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
8.0
Very good

Boarding

8.2

Crew

8.5

Overall

8.0

Entertainment

7.9

Comfort

7.9

Food

7.3

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
8.0
Very good

Boarding

8.2

Crew

8.5

Overall

8.0

Entertainment

7.9

Comfort

7.9

Food

7.3

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
8.0
Very good

Boarding

8.2

Crew

8.5

Overall

8.0

Entertainment

7.9

Comfort

7.9

Food

7.3

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

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

    TAP AIR PORTUGAL, at $576, was found to be the cheapest airline from San Francisco to Porto.Alternate airlines to your destination round-trip include Vueling and Air Canada. Users have found that TAP AIR PORTUGAL is 39% 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 ($392), United Airlines ($393), and Air Canada ($398).

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

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

    The majority of Lisbon visitors spend their time at Chiado, Praça do Marquês de Pombal, and Londres. Travelers on a layover in Lisbon can visit Chiado, Praça do Marquês de Pombal, and Londres, by traveling 4.5 mi, 3.6 mi, and 2.3 mi, respectively after landing at Lisbon Humberto Delgado. Travelers can book a car rental at Lisbon Humberto Delgado for about $23 per day to make their sightseeing more efficient.

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

  • 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 $523). Flying from San Francisco to Porto in June is currently the most expensive (average of $1,033). 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 San Francisco?

Book flights to San Francisco if you plan to visit one of these locations
Aveiro
Coimbra
Matosinhos

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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 julio 3, 2025.
AirlineCheapestAverageFlexibilityOn-time
IberiaCheapest$540Average$1,091FlexibilityNo cancel feeOn-time77%
DeltaCheapest$553Average$987FlexibilityNo cancel feeOn-timeN/A
TAP AIR PORTUGALCheapest$570Average$883FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$617Average$1,119FlexibilityNo cancel feeOn-time71%
Scandinavian AirlinesCheapest$624Average$782FlexibilityNo cancel feeOn-time77%
KLMCheapest$673Average$1,051FlexibilityNo cancel feeOn-time75%
SWISSCheapest$680Average$967FlexibilityNo cancel feeOn-time79%
United AirlinesCheapest$694Average$1,065FlexibilityNo cancel feeOn-time69%
Air CanadaCheapest$711Average$1,112FlexibilityNo cancel feeOn-time67%
Air TransatCheapest$781Average$819FlexibilityNo cancel feeOn-time50%

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