OPO - SFO

$337 Find Cheap Flights from Porto to San Francisco - Compare and Save

1 adult
1 adult, Economy, 0 bags

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Everything you should know

Cheapest round-trip
$597
Typical prices: $726-$962
Scandinavian Airlines
Mon 10/29Sun 11/4
OPO - SFO • 1 stop
Cheapest one-way
$337
Typical prices: $612-$929
Multiple Airlines
Thu 11/15
OPO - SFO • 3 stops
Nonstop flights
Not available
There are currently no direct flights between Porto and San Francisco. You'll need to take a connecting flight to reach the destination.
Insights
Insights
When to travel
January
Cheapest • 17% price drop
September
Most popular
Good to know
+1
Good to know
+1
Top layover airports
Montreal Pierre Elliott Trudeau Intl (YUL)
Cheapest • Avg $728 (round-trip)
Newark (EWR)
Shortest trip • 15h 43m (one-way)
Insights
Insights
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Booking Insights
Flight Deals

Cheap Flights from Porto to San Francisco (OPO-SFO)

 
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Porto to San Francisco

Thu, Oct 29 - Wed, Nov 4
Scandinavian Airlines Logo
5:50 pm - 3:50 pmOPO  Porto-SFO San Francisco
29h 00m1 stop Kastrup Copenhagen
Scandinavian Airlines Logo
4:45 pm - 5:00 pmSFO  San Francisco-OPO Porto
16h 15m1 stop Kastrup Copenhagen
$597Scandinavian Airlines
Fri, Oct 23 - Mon, Nov 9
Scandinavian Airlines Logo
5:55 pm - 2:40 pmOPO  Porto-SFO San Francisco
28h 45m1 stop Kastrup Copenhagen
Scandinavian Airlines Logo
4:45 pm - 11:05 amSFO  San Francisco-OPO Porto
34h 20m1 stop Kastrup Copenhagen
$655Scandinavian Airlines
Thu, Nov 5 - Tue, Nov 17
Scandinavian Airlines Logo
5:50 pm - 2:50 pmOPO  Porto-SFO San Francisco
29h 00m1 stop Kastrup Copenhagen
Scandinavian Airlines Logo
7:00 am - 11:05 amSFO  San Francisco-OPO Porto
20h 05m2 stops Boston Logan Intl Kastrup Copenhagen
$658Scandinavian Airlines
Thu, Nov 5 - Tue, Nov 17
Scandinavian Airlines Logo
5:50 pm - 2:50 pmOPO  Porto-SFO San Francisco
29h 00m1 stop Kastrup Copenhagen
Scandinavian Airlines Logo
7:00 am - 11:05 amSFO  San Francisco-OPO Porto
20h 05m2 stops Boston Logan Intl Kastrup Copenhagen
$659Scandinavian Airlines
Thu, Oct 29 - Sat, Nov 7
Scandinavian Airlines Logo
5:50 pm - 3:50 pmOPO  Porto-SFO San Francisco
29h 00m1 stop Kastrup Copenhagen
Scandinavian Airlines Logo
2:40 pm - 11:05 amSFO  San Francisco-OPO Porto
36h 25m2 stops Los Angeles Kastrup Copenhagen
$673Scandinavian Airlines
Thu, Oct 29 - Sun, Nov 8
Scandinavian Airlines Logo
5:50 pm - 3:50 pmOPO  Porto-SFO San Francisco
29h 00m1 stop Kastrup Copenhagen
Scandinavian Airlines Logo
6:38 pm - 11:05 amSFO  San Francisco-OPO Porto
56h 27m2 stops Los Angeles Kastrup Copenhagen
$678Scandinavian Airlines
Mon, Sep 21 - Mon, Oct 5
TAP AIR PORTUGAL Logo
6:00 pm - 1:35 pmOPO  Porto-SFO San Francisco
27h 35m1 stop Lisbon Humberto Delgado
TAP AIR PORTUGAL Logo
4:30 pm - 5:00 pmSFO  San Francisco-OPO Porto
16h 30m1 stop Lisbon Humberto Delgado
$713TAP AIR PORTUGAL
Thu, Oct 29 - Tue, Nov 10
Scandinavian Airlines Logo
5:50 pm - 3:50 pmOPO  Porto-SFO San Francisco
29h 00m1 stop Kastrup Copenhagen
Scandinavian Airlines Logo
6:43 pm - 4:55 pmSFO  San Francisco-OPO Porto
62h 12m2 stops Los Angeles Kastrup Copenhagen
$719Scandinavian Airlines
Fri, Oct 23 - Sat, Nov 7
Scandinavian Airlines Logo
5:55 pm - 2:40 pmOPO  Porto-SFO San Francisco
28h 45m1 stop Kastrup Copenhagen
Scandinavian Airlines Logo
2:40 pm - 11:05 amSFO  San Francisco-OPO Porto
36h 25m2 stops Los Angeles Kastrup Copenhagen
$731Scandinavian Airlines
Mon, Sep 21 - Mon, Oct 5
TAP AIR PORTUGAL Logo
10:30 pm - 1:35 pmOPO  Porto-SFO San Francisco
23h 05m1 stop Lisbon Humberto Delgado
TAP AIR PORTUGAL Logo
4:30 pm - 3:00 pmSFO  San Francisco-OPO Porto
14h 30m1 stop Lisbon Humberto Delgado
$735TAP AIR PORTUGAL
Booking Insights

Price, demand and travel trends for Porto to San Francisco flights

Use KAYAK data on prices, travel dates, airlines and seasonal trends to compare options and book flights from Porto to San Francisco with more confidence.

How much is a round-trip flight from Porto to San Francisco?

Round-trip flights from Porto to San Francisco start at $597. Prices are below average for this route right now, with typical round-trip fares ranging from $726 to $962. The lowest price found in the past 5 days was $597 on Scandinavian Airlines.

What's the cheapest day of the week to fly from Porto to San Francisco?

Tuesday is the cheapest day of the week to fly from Porto to San Francisco, it is 15% cheaper than the average day. Monday is the most expensive day with flight prices 20% higher than average. Based on deals found by KAYAK users in the last 12 months.

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

  • January is the cheapest month to fly from Porto to San Francisco at $704 round-trip.
  • June ($1,154) and July ($1,016) are the most expensive months.
  • The price difference between flying in the cheapest and most expensive months is 63% on average.
This is based on KAYAK aggregated and averaged internal data over the past 12 months.

Find deals

Key details for Porto to San Francisco flights

Low season

May

Cheapest flight

$337
Best time to beat the crowds but there is an average 5% increase in price.
Most popular time to fly and prices are also 7% lower on average.
Flight from Porto to San Francisco

When to book flights from Porto to San Francisco

Are your dates flexible? Find out the best times to travel from Porto to San Francisco based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price

Your Porto to San Francisco flight questions, answered

Find helpful route details based on KAYAK data, including flight times, airports, airlines and booking questions.

  • Which airports can I use when flying from Porto to San Francisco?

    Flights from Porto to San Francisco usually depart from Porto (OPO) and arrive at San Francisco (SFO).

  • What cabin classes can I book on flights from Porto to San Francisco?

    Three cabin classes are available on flights from Porto to San Francisco:

    • Economy Class
    • Premium Economy Class
    • Business Class

  • Which airports do connecting flights from Porto to San Francisco pass through?

    One-stop flights from Porto to San Francisco most commonly connect through:

    • Lisbon Humberto Delgado (LIS) - 38% of one-stop connections
    • Zurich (ZRH) - 16% of one-stop connections
    • Munich Franz Josef Strauss (MUC) - 11% of one-stop connections
    • Amsterdam Schiphol (AMS) - 10% of one-stop connections

    Lisbon Humberto Delgado (LIS) handles the largest share of one-stop connections on this route.

  • Can I save money by using flexible dates for flights from Porto to San Francisco?

    Yes. Being flexible with your travel dates can save you up to 30% on the Porto to San Francisco route. Tuesday is the cheapest departure day at $725 round-trip on average, while Monday is the most expensive at $1,027, a difference of $302. KAYAK's flexible dates feature shows options up to 3 days before and after your selected dates, making it easier to compare nearby fares.

  • What popular places can I visit in San Francisco?

    Some of the most popular sights in San Francisco are Fisherman's Wharf, Union Square and Moscone Center. These are among the most viewed places in San Francisco on KAYAK.

  • How long is a flight from Porto to San Francisco?

    A nonstop flight from Porto to San Francisco takes 0h 00m, covering 5,566 miles.

  • Do I need a passport to fly from Porto to San Francisco?

    Yes, a valid passport is required for this international route. Many destinations require at least six months of validity beyond your travel dates. Check your passport expiry well before booking.

  • How are flight prices from Porto to San Francisco looking right now?

    One-way fares from Porto to San Francisco are currently lower than usual. Average one-way flight prices are about $395, which is 46% below the typical average for this route.

  • How much time can I save by choosing a different layover airport from Porto to San Francisco?

    Flying via Montreal Pierre Elliott Trudeau Intl (YUL) gives the shortest average 1-stop total travel time at 15h 07m, compared with 15h 43m via Newark (EWR) and 15h 48m via Zurich (ZRH).

  • What is the time difference between Porto and San Francisco?

    San Francisco is 8 hours behind Porto (Pacific Time vs Western European Time). Plan for the time shift when scheduling connections or first-day activities.

  • What car rental options are available at San Francisco Airport (SFO)?

    San Francisco Airport (SFO) hosts 5 major car rental companies, with daily rates starting from around $15 for economy cars. Top options include:
    · Thrifty
    · Europcar
    · Dollar
    · Hertz
    · Fox

  • How much should I expect to pay for a Porto to San Francisco flight?

    Round-trip flights from Porto to San Francisco range from $726 to $962, with an average of $851 over the past 12 months. Anything below $726 counts as a good deal.

Your guide to booking Porto to San Francisco flights

Get tips on when to book, when to fly and what to know before your trip.
  • If your dates can be flexible, aim for a Tuesday departure instead of Monday. On this route, Tuesday flights average $725 - about $302 less than Monday (29% savings) based on the last 12 months.
  • If you can choose when to travel, plan your Porto to San Francisco trip for January. Fares historically average $704 round-trip in that month - typically $450 less than the most expensive month, which is June (based on the last 12 months).
  • If you're arriving late at night and need somewhere to stay, check out these hotels close to San Francisco Airport.
    - Grand Hyatt At Sfo

Everything you need to know for your flight from Porto to San Francisco

Information on your arrival and departure airports

Porto (OPO)
San Francisco (SFO)