391 € Cheap Flights from San Diego to Porto

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Find the cheapest month or even day of the year to fly to Porto

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Flight deals from San Diego to Porto

Looking for a cheap last-minute deal or the best return flight from San Diego to Porto? Find the lowest prices on one-way and return tickets right here.

Find the cheapest month to fly from San Diego to Porto

We’re always keeping an eye on fares, so you can find the best one in seconds. It looks like San Diego to Porto flights are currently cheapest in December.

San Diego to Porto: Alternative routes

Compare routes from San Diego to Porto below. You may find an airport to fly into that's cheaper, faster, or easier than Porto.

San Diego to Porto: Flight information

The things to know before you go.
Cheapest flight found391 €
Cheapest month to flyDecember

Finding cheap flights from San Diego to Porto: Frequently asked questions

The best price we found for a return flight from San Diego to Porto is 391 €. This is an estimate based on information collected from different airlines and travel providers over the last 4 days and is subject to change and availability.
Currently, there are no airlines that fly direct from San Diego to Porto. But we found flights with one stop from 391 €.
As of November 2025, there are no flights flying from San Diego to Porto.
The cheapest month to fly from San Diego to Porto is usually December.
After crunching the numbers on our flight calendar, we found that it is currently cheapest to fly from San Diego to Porto Airport on Tuesday, 2 December 2025.
No airlines currently offer direct flights between San Diego and Porto Airport. Most routes have one or more stops.
We show every price from over 1,200 airlines and travel agents, comparing them all so you don’t have to. If you know you want to fly to Porto but you’re not ready to book, set up a Price Alert. We’ll track prices for you, and let you know when they rise or fall.
We crunched all the numbers in our flight calendar and it looks like the cheapest time to book a flight to Porto is around 40 days in advance, so don’t leave your flight to the last minute.
The cheapest airline that flies to Porto is SWISS .

Flying from San Diego to Porto Airport (OPO): What you need to know

  • San Diego International Airport (SAN) is San Diego's main airport. Explore your options for reserving a flight from San Diego to Porto Airport (OPO) jetting off from here.

  • Porto is seven hours ahead of San Diego. Porto Airport is located in Porto, which follows the UTC+0 timezone.

  • To ensure you get on your flight from San Diego to OPO, leave plenty of time for things like check-in and baggage drop. Turning up two hours before international departures and one hour before domestic flights is the general travel rule.

  • If you're taking off during a major holiday or other peak period, give yourself extra time. Get there two hours before domestic flights and up to four hours before international departures. Queues at check-in and security will be longer.

Airports in San Diego

San Diego International Airport (SAN)

  • Think about adding a stopover to find cheap flights from San Diego to OPO. Simply deselect 'Direct flights only' when searching for departures from San Diego International Airport (SAN). Slip in a stop (and skip the high fares) by flying through one of these popular options:

    • Newark Liberty International Airport (EWR)

    • Pearson International Airport (YYZ)

    • Montreal-Pierre Elliott Trudeau International Airport (YUL)

  • Located around 5 kilometres from central San Diego, SAN can be reached in about 10 minutes by car (depending on traffic). The journey by public transport will take roughly 20 minutes.

  • Have an early flight from San Diego to Porto Airport? Avoid rushing to the terminal (and enjoy a little extra shut-eye) by choosing one of these hotels near San Diego International Airport:

  • Of the flights that depart from San Diego International Airport, 71.38% touch down on time at their destination.

  • The address for SAN is N Harbour Dr.

McClellan-Palomar Airport (CLD)

  • CLD is around 56 kilometres from central San Diego. It takes 40 minutes or so to get to the airport in a car from the city centre. Public transport takes approximately 2 hours 15 minutes.

  • Want to treat yourself to an extra night away before catching your San Diego to OPO flight? Check in to a hotel near McClellan-Palomar Airport before your break officially begins. These stays are calling your name:

About Porto Airport (OPO)

  • The last thing you need is a long journey to your hotel if you're getting in late on a flight from San Diego to Porto Airport. Make yourself comfy at one of these accommodation options near OPO instead:

  • Grab a Porto Airport rental car and explore Porto and beyond with your own set of wheels. Klass Wagen, Goldcar and Drive & Go are top providers you can book with here.

  • Booking your vehicle around three weeks ahead of your San Diego to Porto Airport flight can help you get the lowest rate.

Getting from Porto Airport (OPO) to central Porto

  • Central Porto is roughly 11 kilometres from Porto Airport. Journey times by cab or car hire will vary based on traffic conditions, so do some research before your trip.

  • Travelling by public transport takes around 50 minutes.

How to find the cheapest flights from San Diego to Porto Airport (OPO)

  • 315 € is currently the lowest price for a one-way ticket from San Diego to Porto Airport. Return flights start from 391 €. These prices may change depending on availability.

  • Booking ahead of time is often the key to finding a cheap flight from San Diego to OPO. Fares tend to rise as demand increases, so the closer your departure date, the more it could cost you.

  • Cheap San Diego to Porto Airport tickets are easier to find when your travel dates are flexible. Use the 'Whole month' search tool to compare fares across each month and then fly out on the cheapest day.

  • You don't need to search every day to find out if fares have dropped when you set up a Price Alert. We'll let you know when a better deal comes up on plane tickets from San Diego to OPO.

  • Find the best deal on a flight from San Diego to Porto Airport with the help of the filters. Choose your preferred arrival and departure times, airlines and number of stops. You can also sort your results by 'Best,' 'Cheapest' or 'Fastest.'

The best time to fly from San Diego to Porto Airport (OPO)

  • August is the busiest month for flights from San Diego to Porto Airport (OPO). Plan your visit to Porto in February for a quieter experience.

  • The warmest month in Porto is August, with temperatures ranging between 14ºC (57ºF) and 32ºC (90ºF). Book your San Diego to OPO plane ticket then if this is the type of weather you enjoy.

  • Look for cheap tickets from San Diego to Porto Airport in January if you'd rather travel during cooler conditions. Temperatures are at their lowest then, ranging between 3ºC (37ºF) and 14ºC (57ºF).

More about Porto

  • Start your Porto trip right by choosing the perfect place to stay. After booking your flight from San Diego to Porto Airport, explore our selection of hotels including:

  • Your visit to Porto should come with a side of sightseeing. Major attractions that should be on your list include Ribeira District, Rio Douro and Livraria Lello.

Explore more of Portugal

  • You've visited Porto, now it's time to discover other corners of Portugal. Journey about 290 kilometres south to Lisbon to check off its leading sights. From belém to Pasteis de Belém and Real Mosteiro de Santa Maria de Belém, there's plenty to keep you on the go.

  • Amadora is another favourite destination in Portugal and is around 274 kilometres south of Porto. No trip is complete without seeing Roman Villa, Park Fonte das Avencas and Park Fantasia.

Prices shown on this page are estimated lowest prices only. Found in the last 45 days.