Latest deals
Insights
When to book
FAQs
Reviews
Price Alerts

Cheap flights from San Francisco to Porto from $270

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from San Francisco to Porto departing on 11/29. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
0 bags

Discover deals from 900+ travel sites with momondo.

Save money when you book flights with momondo

Big names and deals

Big names and deals

Search 100s of travel sites to compare prices.

Filter for what you want

Filter for what you want

Free Wi-Fi? Stopover? Instantly customize your results.

Trusted and free

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Price Alerts

Not ready to book? to track prices.
Search flight deals

Find the cheapest flights from San Francisco to Porto

Cheap round-trip flights

Enter your travel dates to find the best prices.
Scandinavian Airlines Logo
4:15 pm - 4:55 pmSFO-OPO
41h 40m2 stops
Scandinavian Airlines Logo
11:50 am - 3:35 pmOPO-SFO
34h 45m1 stop
$455Scandinavian Airlines
Find Deal
Wed, Mar 11 - Wed, Mar 18
Scandinavian Airlines Logo
1:00 pm - 4:55 pmSFO-OPO
44h 55m2 stops
Scandinavian Airlines Logo
11:50 am - 3:35 pmOPO-SFO
34h 45m1 stop
$456Scandinavian Airlines
Find Deal
Wed, Mar 11 - Wed, Mar 18
Air Canada Logo
8:25 am - 12:05 pmSFO-OPO
19h 40m2 stops
Air Canada Logo
6:00 am - 9:39 pmOPO-SFO
23h 39m2 stops
$496Air Canada
Find Deal
Thu, Nov 27 - Wed, Dec 10
SWISS Logo
7:25 pm - 6:35 pmSFO-OPO
15h 10m1 stop
SWISS Logo
12:05 pm - 4:30 pmOPO-SFO
36h 25m1 stop
$510SWISS
Find Deal
Sat, Jan 17 - Mon, Feb 16
SWISS Logo
7:25 pm - 11:10 amSFO-OPO
31h 45m1 stop
SWISS Logo
7:25 pm - 4:30 pmOPO-SFO
29h 05m1 stop
$513SWISS
Find Deal
Thu, Nov 27 - Thu, Dec 4
United Airlines Logo
8:35 am - 9:30 amSFO-OPO
16h 55m1 stop
United Airlines Logo
6:00 am - 3:55 pmOPO-SFO
17h 55m1 stop
$520United Airlines
Find Deal
Thu, Nov 27 - Wed, Dec 10
United Airlines Logo
2:40 pm - 2:45 pmSFO-OPO
16h 05m1 stop
United Airlines Logo
6:00 am - 3:55 pmOPO-SFO
17h 55m1 stop
$538United Airlines
Find Deal
Thu, Jan 22 - Tue, Feb 17
Lufthansa Logo
2:40 pm - 10:25 pmSFO-OPO
23h 45m1 stop
Lufthansa Logo
4:15 pm - 12:40 pmOPO-SFO
28h 25m1 stop
$559Lufthansa
Find Deal
Sun, Jan 18 - Sun, Feb 15
TAP AIR PORTUGAL Logo
5:35 pm - 5:00 pmSFO-OPO
16h 25m1 stop
TAP AIR PORTUGAL Logo
8:05 pm - 2:45 pmOPO-SFO
26h 40m1 stop
$577TAP AIR PORTUGAL
Find Deal
Sat, Nov 1 - Fri, Nov 14
TAP AIR PORTUGAL Logo
5:35 pm - 3:00 pmSFO-OPO
14h 25m1 stop
TAP AIR PORTUGAL Logo
8:05 pm - 2:45 pmOPO-SFO
26h 40m1 stop
$578TAP AIR PORTUGAL
Find Deal
Sat, Nov 1 - Fri, Nov 14

Scandinavian Airlines flights from San Francisco to Porto

Our best Scandinavian Airlines deals on San Francisco to Porto flight tickets
Scandinavian Airlines
Mar 11
SFO4:15 pmSan Francisco
41h 40m
2 stops
OPO4:55 pmPorto
Mar 18
OPO11:50 amPorto
34h 45m
1 stop
SFO3:35 pmSan Francisco
$455
Find similar
Scandinavian Airlines
Mar 11
SFO1:00 pmSan Francisco
44h 55m
2 stops
OPO4:55 pmPorto
Mar 18
OPO11:50 amPorto
34h 45m
1 stop
SFO3:35 pmSan Francisco
$456
Find similar
Scandinavian Airlines
Nov 2
SFO4:40 pmSan Francisco
16h 05m
1 stop
OPO4:45 pmPorto
Nov 7
OPO5:35 pmPorto
29h 00m
1 stop
SFO2:35 pmSan Francisco
$550
Find similar

Air Canada flights from San Francisco to Porto

Our best Air Canada deals on San Francisco to Porto flight tickets
Air Canada
Nov 27
SFO8:25 amSan Francisco
19h 40m
2 stops
OPO12:05 pmPorto
Dec 10
OPO6:00 amPorto
23h 39m
2 stops
SFO9:39 pmSan Francisco
$496
Find similar
Air Canada
Nov 27
SFO8:25 amSan Francisco
19h 40m
2 stops
OPO12:05 pmPorto
Dec 4
OPO6:00 amPorto
23h 39m
2 stops
SFO9:39 pmSan Francisco
$498
Find similar
Air Canada
Feb 16
SFO8:30 amSan Francisco
22h 25m
2 stops
OPO2:55 pmPorto
Feb 22
OPO6:15 amPorto
23h 24m
2 stops
SFO9:39 pmSan Francisco
$553
Find similar

momondo 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, momondo users made 832,500 searches. Data last updated October 14, 2025.
Use the filters below to find and compare flights from San Francisco to Porto that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Wed 3/11

4:15 pm-4:55 pm

2 stops41h 40m

Porto

Wed 3/18

11:50 am-3:35 pm

1 stop34h 45m

$455

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Wed 3/11

1:00 pm-4:55 pm

2 stops44h 55m

Porto

Wed 3/18

11:50 am-3:35 pm

1 stop34h 45m

$456

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Thu 11/27

8:25 am-12:05 pm

2 stops19h 40m

Porto

Wed 12/10

6:00 am-9:39 pm

2 stops23h 39m

$496

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Sat 1/17

7:25 pm-6:35 pm

1 stop15h 10m

Porto

Mon 2/16

12:05 pm-4:30 pm

1 stop36h 25m

$510

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Thu 11/27

7:25 pm-11:10 am

1 stop31h 45m

Porto

Thu 12/4

7:25 pm-4:30 pm

1 stop29h 05m

$513

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Thu 11/27

8:35 am-9:30 am

1 stop16h 55m

Porto

Wed 12/10

6:00 am-3:55 pm

1 stop17h 55m

$520

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Thu 1/22

2:40 pm-2:45 pm

1 stop16h 05m

Porto

Tue 2/17

6:00 am-3:55 pm

1 stop17h 55m

$538

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Sun 1/18

2:40 pm-10:25 pm

1 stop23h 45m

Porto

Sun 2/15

4:15 pm-12:40 pm

1 stop28h 25m

$559

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Sat 11/1

5:35 pm-5:00 pm

1 stop16h 25m

Porto

Fri 11/14

8:05 pm-2:45 pm

1 stop26h 40m

$577

San FranciscoPorto

SFO - OPO

SFOOPO

San Francisco

Sat 11/1

5:35 pm-3:00 pm

1 stop14h 25m

Porto

Fri 11/14

8:05 pm-2:45 pm

1 stop26h 40m

$578

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
1
2

See travel insights to Porto from

How to get the cheapest flight ticket from San Francisco to Porto

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest month to fly to Porto?

The month of January is, on average, the cheapest month to fly to Porto from San Francisco, with most prices found around $652. If you aren’t able to travel during the month of January, then book flights to Porto from San Francisco during October instead. Flights to Porto in October, while not as cheap as those in January, still average around $720.

What is the cheapest day to depart on your flight to Porto?

The cheapest day to depart on your flight to Porto is on a Thursday when prices can be found for as low as $981. This is often the case because there is less demand to fly during this day of the week. If your travel schedule is flexible, try to avoid departing on a Wednesday because tickets tend to average around $1,148. These prices are subject to change though, so be sure to set up a Price Alert for flights to Porto.

What is the cheapest time of day to depart on your flight to Porto?

In the afternoon is the cheapest time of day to fly from San Francisco to Porto when you can find flight prices for as low as $896. Flying to Porto in the afternoon is an ideal time because this is during off-peak travel hours. If you have a flexible travel schedule, then try to avoid flying in the morning when prices are $1,138 on average. Flights to Porto from San Francisco in the morning are generally more expensive because this time of day is more convenient for travelers’ schedules.

How far in advance should I book a flight to Porto?

You are more likely to see cheaper flights to Porto from San Francisco when booking weeks ahead of your departure date. In general, you can expect to find flights to Porto for around $921 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Porto from San Francisco for as low as $751 on momondo.

How have San Francisco to Porto flight prices changed over time?

As of October 2025, prices for San Francisco to Porto flights are approximately 8% cheaper when compared to flights at the same time last year.

When to book flights from San Francisco to Porto

Are you open to changing your travel dates? Check out the ideal times to fly from San Francisco to Porto according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap San Francisco to Porto (SFO to OPO) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from San Francisco to Porto

Direct flights

None
There are no direct flights from San Francisco to Porto. There are no popular flight routes from San Francisco to Porto.
Search flight deals

  • How far is San Francisco to Porto by plane?

    Porto is 5565.0 mi away from San Francisco. Typically, this will take 13h 30m by plane in normal conditions.

  • When did momondo last update prices for flights from San Francisco Airport to Porto Airport?

    Prices for flights from San Francisco Airport to Porto Airport were last updated today.

  • How many operators does momondo search for flights from San Francisco Airport to Porto Airport?

  • How old do you have to be to fly from San Francisco Airport to Porto Airport?

    The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from San Francisco Airport to Porto Airport.

  • What documentation or ID do you need to fly to Porto Airport?

    The necessary travel and health documents for your Porto Airport trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

  • What is the most popular airline from San Francisco to Porto?

Best airlines flying from San Francisco to Porto

Compare and see reviews for airlines that fly from San Francisco to Porto with momondo
Airline
Rating
Free Cancellation
Price
IberiaPriceFrom $540Free CancellationRating
7.0
2,990 reviews
Search Iberia flights
TAP AIR PORTUGALPriceFrom $573Free CancellationRating
7.1
2,015 reviews
Search TAP AIR PORTUGAL flights
Scandinavian AirlinesPriceFrom $624Free CancellationRating
7.4
1,532 reviews
Search Scandinavian Airlines flights
SWISSPriceFrom $636Free CancellationRating
7.5
1,772 reviews
Search SWISS flights
United AirlinesPriceFrom $652Free CancellationRating
7.4
8,977 reviews
Search United Airlines flights
DeltaPriceFrom $661Free CancellationRating
7.9
7,977 reviews
Search Delta flights
LufthansaPriceFrom $667Free CancellationRating
6.8
7,489 reviews
Search Lufthansa flights
KLMPriceFrom $673Free CancellationRating
7.7
1,402 reviews
Search KLM flights
Air CanadaPriceFrom $776Free CancellationRating
7.1
10,298 reviews
Search Air Canada flights
Air TransatPriceFrom $781Free CancellationRating
7.7
458 reviews
Search Air Transat flights

Traveling to a place near Porto?

Book flights to Porto if you plan to visit one of these locations
Vila Nova de Gaia
Coimbra
Aveiro
Braga
Matosinhos
Caminha
Esposende
Lamego
Guimarães
Chaves
Espinho
Viseu
Ponte de Lima
Arcos de Valdevez
Pinhao
Curia
Penafiel
Mesao Frio
Mira
Baiao

Why use momondo?

Why should I use momondo to find a flight deal from San Francisco to Porto?

To find the flight that best suits your needs, momondo gathers a range of flights from a large pool of different airlines and agents; you can then use our insights and filters to find and book the right flight to Porto from San Francisco.

Can I find flights from San Francisco to Porto with flexible booking policies on momondo?

Flights from San Francisco to Porto with flexible booking policies can be found by using the search form above and then selecting our dedicated flexible booking filter, which will highlight only the flights where this policy is applied.

How can momondo help me find flights from San Francisco to Porto?

Once all potential San Francisco to Porto flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.

I’m not ready to book a flight from San Francisco to Porto right now. Can momondo alert me if prices change?

If you are simply researching potential flights to Porto, momondo offers a useful price alert feature which will track prices for flights to Porto from San Francisco and alert you when they change.

An easier way to manage your Porto trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.
Start using Trips
Find my bookings

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.
1 adult
Thu 11/13
Thu 11/20
By creating a price alert you accept our terms of use and privacy policy.

Find better results for your trip to Portugal