The cheapest times to fly from SFO to OPO are

  • January 8th to April 15th (except the week of March 26th)
  • September 10th to December 9th (except the week of October 22nd)

based on data collected exclusively by Champion Traveler across tens of millions of flights. Among all the dates above, the very cheapest time to fly from SFO to OPO is late November to early December. Prices can be as high as $1745 for Friday flights during early August, or as low as $562 for Thursday flights around late November to early December.


When to Fly to Porto

Flying from San Francisco, CA (SFO) to Porto (OPO) will usually cost between $776 to $1378 per person if booking more than four weeks in advance. On average the very cheapest time to fly is late November to early December with an average ticket price of $805. Due to high demand the most expensive time to fly is early August, with an average price of $1465. Planning your trip to low-cost times can easily save you $659 on economy flights and even more on first-class flights. Generally, any price below $907 can be considered a good price for a round-trip SFO to OPO flight.

See below for a graph of average weekly prices for the SFO to OPO route. All prices are for round-trip tickets in USD.

SFO to OPO Flight Prices

Compared to other flights, the SFO to OPO flight is priced close to the average and costs less than the average flight leaving from San Francisco. The average price per mile (for a direct flight) is $0.1, which is far below average.


Flight Prices by Day of the Week

Thursday is usually the cheapest day to depart and return on this flight. Fridays are the most expensive days to fly to Porto, and Sundays are the most expensive days to return to San Francisco. Selecting flights on the least expensive days could save you up to $154 (14%) on this flight.

Departing prices are for round-trip flights returning on the day of departure. For example, a flight departing on Thursday and returning a week later will cost an average of $896. Return trip prices are from the OPO to SFO flight, and often highlight the quality of our data in showing the same trend.

Departing Prices by Day

Departure Day Prices

Return Trip Prices by Day

Return Day Prices


Nonstop Flights and Layovers

Travelers looking to fly from SFO to OPO can generally find a 1-layover flight. Because there is not usually a direct flight option the real-world direct flight time of 11 hour 0 minutes may not be realistic.


Alternative Nearby Airports

Champion Traveler tells you which airports are nearby and whether tickets might be cheaper alternative airports nearby. Sometimes it’s worth it to fly into a closer airport and then commute to your destination. Remember that there is not usually a nonstop flight from SFO to OPO while comparing.

Destination alternative #1: Santiago Airport (SCQ) in Santiago de Compostela

  • 115 miles (185 km) away from OPO
  • Usually 0.66% less expensive than OPO
  • 1-layover flights available

See SFO to SCQ flights


Flight Hacking SFO to OPO

Flight hacking is when you book two tickets instead of a layover, sometimes with different airlines. You will need to either bring only a carry-on bag (highly recommended) or leave yourself plenty of time to go through security again. Flight hacking is completely allowed, but airlines don’t always tell you the cheapest way to get from SFO to OPO — but Champion Traveler does!

Hack #1: London (SFO > LGW > OPO)

  • Price for both tickets: $540
  • Average savings: $367 (40.46%)

See SFO to LGW flights

Hack #2: Barcelona (SFO > BCN > OPO)

  • Price for both tickets: $598
  • Average savings: $309 (34.07%)

See SFO to BCN flights

Hack #3: Paris (SFO > CDG > OPO)

  • Price for both tickets: $625
  • Average savings: $282 (31.09%)

See SFO to CDG flights


Flight Questions Answered

Still have questions about flying from SFO to OPO? We’ve got answers.

Which airlines fly this route?

You can find 37 major airlines flying this route most often: Aigle Azur, Air Canada, Air Europa, Air France, Air New Zealand, Air Transat, Alaska, Alitalia, American, Austrian, Azores Airlines, British Airways, Brussels Airlines, Condor, Delta, Emirates, Eurowings, Finnair, French bee, Iberia, Jet2, JetBlue, KLM, LOT, Lufthansa, Norwegian Air UK, Royal Air Maroc, SAS, Singapore Airlines, SWISS, Tap Air Portugal, Thomas Cook Airlines, Turkish Airlines, United, Virgin Atlantic, WestJet, Wizz Air, and potentially more during busy seasons.

How far away is it from Porto Airport to San Francisco International Airport?

The distance between the two airports is roughly 5569 miles or 8962 kilometers.

How long does it take to fly from SFO to OPO?

The real-world flight time for a nonstop SFO to OPO flight is about 11 hour 0 minutes.

How many flights go between San Francisco, CA and Porto?

It depends on the day of the week and the date, but a typical day might have around 80 available flights from SFO to OPO.


Airport Location Info


Departing Airport

Origination codeSFO
Origination airport nameSan Francisco International Airport
CitySan Francisco, CA
Countrythe United States

Return Airport

Destination codeOPO
Destination airport namePorto Airport


Other Resources

Please note that while we’ve worked hard to analyzed tens of millions of flights to get you this data, we do not calculate current live prices or guarantee pricing. Please see our partners using the links above for current offers.