SFO - OPO

$359 Find Cheap Flights from San Francisco to Porto

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from San Francisco to Porto departing on 10/18. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy, 0 bags

KAYAK searches hundreds of travel sites at once for deals on flights to Porto

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from San Francisco to Porto.
These are the airlines KAYAK users have selected most often from within our search results in flight searches from San Francisco to Porto.
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Everything you should know

Cheapest round-trip
$645
Typical prices: $907-$665
Scandinavian Airlines
Thu 11/12Sat 11/21
SFO - OPO • 1 stop
Cheapest one-way
$359
Typical prices: $504-$865
American Airlines
Sun 10/18
SFO - OPO • 2 stops
Top airlines
Cheapest • from $645 (round-trip)
Best reviews • 7.9 score
Airline reviews
Airline reviews
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Airline reviews
Airline reviews
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Nonstop flights
Not available
There are currently no direct flights between San Francisco and Porto. You'll need at least 1 connection.
Insights
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Top layover airports
Cheapest • Avg $897 (round-trip)
Shortest trip • 13h 58m (one-way)
Insights
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When to book
in advance
Our data shows that travelers who book at least 4 weeks in advance save around 24% compared to booking last minute.
Insights
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Insights
When to travel
Cheapest • 35% price drop
Most popular
Good to know
Good to know
+1
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Flight Deals
Booking Insights
Flight Deals

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

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from San Francisco to Porto that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from San Francisco to Porto

Thu, Nov 12 - Sat, Nov 21
Scandinavian Airlines Logo
4:45 pm - 11:10 am
SFO
-
OPO
34h 25m
1 stop
Scandinavian Airlines Logo
12:00 pm - 2:50 pm
OPO
-
SFO
34h 50m
1 stop
$645Scandinavian Airlines
Thu, Nov 19 - Sun, Nov 22
Scandinavian Airlines Logo
4:45 pm - 11:10 am
SFO
-
OPO
34h 25m
1 stop
Scandinavian Airlines Logo
5:35 pm - 2:50 pm
OPO
-
SFO
29h 15m
1 stop
$699Scandinavian Airlines
Mon, Oct 19 - Mon, Oct 26
Iberia Logo
11:30 am - 4:00 pm
SFO
-
OPO
20h 30m
2 stops
Iberia Logo
8:40 pm - 9:26 pm
OPO
-
SFO
31h 46m
2 stops
$792Iberia
Wed, Oct 28 - Tue, Nov 3
Iberia Logo
3:50 pm - 4:00 pm
SFO
-
OPO
17h 10m
2 stops
Iberia Logo
8:20 am - 10:58 pm
OPO
-
SFO
22h 38m
2 stops
$794Iberia
Mon, Aug 17 - Thu, Aug 27
Scandinavian Airlines Logo
4:45 pm - 11:00 am
SFO
-
OPO
34h 15m
1 stop
Scandinavian Airlines Logo
11:50 am - 2:40 pm
OPO
-
SFO
34h 50m
1 stop
$795Scandinavian Airlines
Mon, Oct 5 - Thu, Oct 15
American Airlines Logo
10:29 am - 11:45 am
SFO
-
OPO
17h 16m
2 stops
American Airlines Logo
8:20 am - 9:48 pm
OPO
-
SFO
21h 28m
2 stops
$798American Airlines
Wed, Oct 28 - Tue, Nov 3
KLM Logo
7:00 am - 8:05 am
SFO
-
OPO
18h 05m
1 stop
KLM Logo
9:55 am - 11:45 am
OPO
-
SFO
33h 50m
1 stop
$803KLM
Sun, Aug 16 - Tue, Aug 25
Multiple Airlines Logo
5:40 pm - 10:00 pm
SFO
-
OPO
20h 20m
1 stop
Multiple Airlines Logo
9:30 pm - 2:35 pm
OPO
-
SFO
25h 05m
2 stops
$805Multiple Airlines
Wed, Oct 28 - Tue, Nov 3
Multiple Airlines Logo
8:25 pm - 6:30 pm
SFO
-
OPO
15h 05m
1 stop
Multiple Airlines Logo
6:00 am - 4:06 pm
OPO
-
SFO
18h 06m
2 stops
$806Multiple Airlines
Mon, Aug 17 - Tue, Aug 25
Multiple Airlines Logo
6:15 pm - 9:00 pm
SFO
-
OPO
18h 45m
1 stop
Multiple Airlines Logo
9:30 pm - 2:35 pm
OPO
-
SFO
25h 05m
2 stops
$809Multiple Airlines
Booking Insights

KAYAK's insights & trends for San Francisco to Porto flights

Get data-powered insights and trends into flights from San Francisco to Porto to help you find the cheapest flights, the best time to fly and much more.

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

This analysis is based on the cheapest round-trip price found on KAYAK in the last 12 months by searching for a flight from San Francisco to Porto departing in November.

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

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from San Francisco to Porto, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.

The cheapest month for flights from San Francisco to Porto is February, where tickets cost $578 (return) on average. On the other hand, the most expensive months are June and July, where the average cost of round-trip tickets is $1,246 and $1,193 respectively.

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

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights from San Francisco to Porto, removes the top 0.1% to account for outliers, and then takes the average of all the values for each week.

To get a below average price on the flight from San Francisco to Porto, you should book around 4 weeks before departure, which saves you about 24% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 13 weeks before departure.

Good to know

Low seasonJanuary
Cheapest flight$359
Best time to beat the crowds but there is an average 1% increase in price.
Most popular time to fly with an average 8% increase in price.
Flight from San Francisco to Porto

When to book flights from San Francisco to Porto

Are your dates flexible? Find out the best times to travel from San Francisco to Porto based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs for booking flights from San Francisco to Porto

  • Which other cities can I visit after deplaning from my San Francisco to Porto flight at Francisco Sá Carneiro (OPO)?

    Porto's Francisco Sa Carneiro Airport (OPO) serves as the entry point for the entire region of northern Portugal. If you want to travel to other towns like Braga, renowned for its religious history and architecture, or Coimbra, renowned for having a well-preserved medieval town inside its boundaries, you may fly into OPO.

  • Can I rent a car for my movement flexibility after deplaning from my San Francisco to Porto flight at Francisco Sá Carneiro (OPO)?

    With OPO's Arrivals Hall hosting a number of car rental agencies' counters, you will find it easy to rent a car for your movement flexibility within and outside Porto. Among the car rental agencies with a car rental booth at OPO are SIXT, Budget, Hertz, and Avis.

  • How can I connect to the city after deplaning from my San Francisco to Porto flight at Francisco Sá Carneiro (OPO)?

    After deplaning from your San Francisco to Porto flight at OPO, you will connect to the city center via Metro Line E, a rental car, a bus, or a taxi. However, you should note that a bus travels between the airport and the city center throughout the night. Also, inquire about the toll pass if you're renting a car.

  • Which eco-friendly airline should I consider for my San Francisco to Porto flight?

    One of the eco-friendly airlines you should consider for your flight from San Francisco to Porto is KLM. The airline has made significant efforts to become more eco-friendly. It has implemented sustainable fuel initiatives, reduced emissions through efficient aircraft operations, and invested in carbon offset programs.

  • What is the cheapest flight from San Francisco to Porto?

    In the last 3 days, the lowest price for a flight from San Francisco to Porto was $359 for a one-way ticket and $645 for a round-trip.

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

    Yes

  • Which airports will I be using when flying from San Francisco to Porto?

    On your way to Porto, you’ll fly out from San Francisco. You’ll be landing at Porto.

  • Which aircraft models fly most regularly from San Francisco to Porto?

    We unfortunately don’t have that data for this specific route.

  • Which airline alliances offer flights from San Francisco to Porto?

    oneworld, SkyTeam, and Star Alliance are the airline alliances operating flights between San Francisco and Porto, with oneworld being the most commonly used for this route.

  • What is the most popular layover when flying to Porto from San Francisco?

    Lisbon is the most popular layover city among KAYAK users traveling from San Francisco to Porto.

  • Which is the best airline for flights from San Francisco to Porto, Delta or KLM?

    The two airlines most popular with KAYAK users for flights from San Francisco to Porto are Delta and KLM. With an average price for the route of $1,105 and an overall rating of 7.9, Delta is the most popular choice. KLM is also a great choice for the route, with an average price of $991 and an overall rating of 7.8.

  • How does KAYAK find such low prices on flights from San Francisco to Porto?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from San Francisco to Porto.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from San Francisco to Porto?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Porto from San Francisco is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from San Francisco to Porto?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Porto with an airline and back to San Francisco with another airline. Booking your flights between San Francisco and OPO can sometimes prove cheaper using this method.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from San Francisco to Porto?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Porto from San Francisco up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

KAYAK’s top tips for finding a cheap flight from San Francisco to Porto

  • When planning your flight from San Francisco to Porto, include at least a single layover. Most airlines servicing this route would make at least one stop before you could land at Francisco Sá Carneiro (OPO). Some of the common layovers on this route include Amsterdam Airport Schiphol (AMS), Adolfo Suárez Madrid-Barajas Airport (MAD), and Dallas/Fort Worth (DFW).
  • If you plan to travel with your pet from San Francisco to Porto, prioritize booking your flight with Delta Airlines. The airline's pet-friendly would allow you to travel with your caged dog or cat in the cabin provided it can fit under the chair. Larger pets would travel as cargo. You should, however, note that your pet will attract some extra charges. You will also need to present a current health certificate issued by a veterinarian.
  • One of the advantages of considering British Airways for your flight from San Francisco to Porto is its ticket upgrading benefits. During your first layover, the airline may send an email requesting to upgrade your ticket and enjoy the first-class amenities at a discounted price.
  • Although all airlines consider Persons with Reduced Mobility (PRMs), you should prioritize booking your flight ticket with Air France. To ensure comfort and enhanced access, the airline offers priority for PRMs, complimentary wheelchair access in SFO and OPO ticket counters, and a team of well-trained staff to care for PRMs' needs.
  • One of the airlines travelers with kids should consider for their flight from San Francisco to Porto is SWISS. To ensure a pleasant journey for your little ones, the airline may offer children's meals, kid-friendly entertainment options, and special toys or coloring books to keep them engaged throughout the flight.

Reviews of the top 5 airlines serving from San Francisco to Porto

 
See real verified KAYAK customer reviews for airlines flying from San Francisco to Porto. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from San Francisco to Porto? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
7.9
DeltaOverall score based on 8426 reviews
7.8Entertainment
7.8Comfort
8.5Crew
7.2Food
8.1Boarding
Airline reviews

While they turned off most cabin lights to allow people to sleep, I was bothered by how bright the side lights still were. It was still quite bright for me in a window seat, when I wish I could have slept!

10.0 ExcellentTeresa, Apr 2026
SMF - LAX
Read more Delta reviews

While they turned off most cabin lights to allow people to sleep, I was bothered by how bright the side lights still were. It was still quite bright for me in a window seat, when I wish I could have slept!

Generally on time departures and arrivals, clean planes, sky miles membership provides great benefits (complimentary upgrades, etc).

N Everything was perfect from boarding to assistance to baggage in Tampa

Loved the crew! Sucks that we went from 1 hour and 8 minute layover to a 3 hour layover. But weather sucks like that.

Fast, lovely scenery, great info on the Delta flight screen about landmarks we were flying over. Great landing!

Long flight but comfortable and not freezing as I have experienced on Hawaiian flights to the islands. They gave us blankets just in case. Nice touch.

I took seat 15A in anticipation of window seat, there is no window.

Flight late, the waited for a long time for “personal” to arrive at gate to dock the plane in Rochester. So annoying. This flight was expected, why aren’t personel available for the jet bridge?

My recent experience was excellent on Delta! I flew with Delta Comfort and I was really comfortable in my seat. I enjoyed the in-flight service. The flight attendants were so friendly and hospitable. I love the snack on the flight as well. This was my first time flying on Delta and I will definitely consider flying with them again.

My flight was canceled on Sunday. Rebooking took three hours. Had to pay for accommodations another night. New flight was delayed for 5 hours, all that was sent was a 12 dollar food voucher, which doesn’t tell you how to use it. Then when we landed we had to sit on the plane for an hour before we could get off.

3hr delay and then missed connecting flight with another 6hr wait at the airport before getting a continuation to my trip, worst trip ever in my 50+years of flight travel

Without a doubt, my “customer service” experience with SWISS was the worst of my life. Multiple disconnections in conversations, very cold and indifferent staff, failure to follow up with promised status updates — simply put, T. H. E. W. O. R. S. T. A full week later, and I am STILL waiting to hear from them. Never again for me with SWISS. Disgraceful.

Very unprofessional treatment of customers - boardring on being unethical. Only cares about money and not the customer. If you use the swiss brand, you should deserve it - now swiss air doesn't deserve the swiss brand.

The flight and all amenities were good to excellent. SWISS was awful to deal with. Every step of the way they nickel and dime you. Chose your seats? $14. Change your seats… No accounting for the prior payment. You get billed again. 17 pound restriction on overhead luggage, nonsense. It’s a weight in the plane whether it’s in the overhead or in check baggage. They just milk you for every cent they can and I resent it. The flight was excellent.

plenty of legspace, snacks, no pull face from flight attendants when asking for a wine. Also fast transfer ability at ZRH.

The flight itself was fine, but due to a snow delay my connection to Lisbon was delayed by six hours. Despite this, Swiss Air still managed to lose my luggage. Not acceptable. Someone else on the flight also lost their luggage.

Bad experience overall. Crew did not provide food for our 2 year old (even though we specifically bought a child infant seat for her and literally bought another full price flight), which was unacceptable. And we had to pay $310 each way to carry our ski equipment even though they advertise it as something that is free. Tickets were purchased the same way as usual, but they told us we had Economy Light tickets (I never elected to have such seats). Just plain manipulation and false advertisment. Very disappointed overall about this airline.

The trip was great until my luggage was lost on transfer from United to Swiss. It took Swiss 3 days to get my luggage to me though it was located almost immediately.

Horrible!! The WiFi was not working, the food was awful

We’ve never been more uncomfortable on a flight than we have on this particular one. The seats in front of us reclined so far back that when the person reclined their seat of broccoli, it almost hit me in the face and left me with literally no room to move that said I had to recline my seed in which made the person behind me upset. It seemed like the seats also would recline without even pressing the button in the armrest and would unrecline as well for that same reason, and it also seemed that some seats reclined more than others. The bottom cushions of the seat were so thin that even after one hour of an 11 hour flight, our tailbones were so sore. It seemed like an overall old airplane. It also didn’t have individual air vents and it was extremely hot the entire flight. Several passengers were commenting on how hot it was. The breakfast was some kind of flavorless triangle, puffy egg, laying in a watery bed of steamed peppers and onions and spinach. It was not appetizing at all. The flight crew was extremely nice so that was a nice thing this flight attendant. They let us try different types of Swiss sodas, which was really nice and the dinner was actually delicious but still overall given the other considerations. It was pretty much a miserable flight without basic seat comfort.

Easy of boarding, helpfully staff at check in, surprisingly comfortable seating

Lost of requested seat assignments. Lost my husband's meal choice

My service dog and I were asked to deplane just before they closed the door - clearly very last minute they couldn’t find the documentation that I have filled out many many times before that is for flying service animals. I purposely purchase 3seats (a whole row) since he is large and not all passengers want to sit next to a dog on a cross country flight. The plane departed with my husband on it!!! They made me fill out a hard copy of the same form and had to reschedule me on a later flight where they could find 3 seats together!! I’ve done this so many times before - clearly the error was on their part in a technology glitch - but really people - do better!! Very traumatic - and my husband had to wait for us when he landed ….so bad. Poor pup was confused and tired.

My flight time was changed without any notification to me which ruined my time sensitive plans so I ended up completely changing my travel plans and no reimbursement.

No screens or meal options. Freezing cold. Dirty seats. Left late.

I liked that my son and I were reseated next to each other (we had different bookings). I liked that it was a directg flight and mostly on time. I liked that you provided pillows and blankets. Flight attendants were generally courteous. The messaging through wifi did not work well. The food was not good. Seats are very narrow and I felt slightly claustraphobic in the window seat.

Some crew were unfriendly or in some cases just straight up rude.

Outstanding service, efficient & friendly crew, flight was safe, comfortable & on time

United Airline crews were very friendly and very attentive. 12 hours flight was gone like in a shorter one.

Flight itself excellent, but delayed so missed connection & got to destination 2 hrs later

Boarding felt a little chaotic as everyone was waiting around the gate. Food was great, service was good.

The passport control process in Lisbon ranks as a 1 on a 1 to 5 scale. Terrible. In line 2 hours and still missed our first flight. Next day, 1.5 hours but we made the flight. The Business Class food was poor. Unidentifiable. Not tasty at all. Unacceptable in BC. Attendants were adequate. Flight left late and arrived late. After this trip, we will not be flying TAP nor will we be connecting through Lisbon.

Flight attendants in business class were rather indifferent While in second leg operated by Portugalia TAP subsidiary were outstanfy

Great service overall. One of the best international flight experiences Ive had.

The chicken was so dry it was impossible to eat. No substitute was offered. The port to charge my phone was broken and all I got was a shrug from the crew. The entertainment system was glitchy and subtitles didn’t load. Crew seemed fully uninterested and unfriendly.

The flight crew were absolute rock stars. When they came to the gate they looked like royalty, so chic. They also were extremely kind. Food was good and I loved the lack of plastic waste. The flight was lovely and smooth.

We were unable to check in due to technical problems on TAP’s end. The flight was delayed forty minutes with no reason given. We received timely notice of the flight delay. We were also notified of a gate change. The new gate was at a different terminal. When we got to the new terminal, we learned that we had to go back to the old terminal first to check in. This information should have been included along with the gate change notification. Also unexplained, the steward skipped us when offering breakfast.

They left our luggage uncovered on tarmac in pouring rain during an hour delay of departure! At our final destination, we found ALL OF OUR CLOTHES/SHOES soaked all the way through!! Our 1st connection plane was a great business class accommodation but only 50 minutes long. Our 2nd connection from Lisbon (another delay with luggage uncovered on tarmac) had only the extra legroom and mediocre food in business class - no entertainment and no extra comfort seating. Will not use TAP Air Portugal again!

The food left a lot to be desired. The crew was great

Horrible experience at tbe check in ladie she was very racist ,she doesn't speak portuguese too and forced me to check in my carrion bag and I saw everyone with carrion bag inside anda lot of space ,she was rude unprofessional

Food choices limited & not enticing Seats quite uncomfortable & difficult to control

Definitely get premium economy on a flight this long if you can. Your legs and while body will thank you.

Boarding was disorganized. The door to one to the toilets wouldn’t lock. The plane was shockingly cramped, and clearly used for domestic flights due to the menus for items to sell domestic travelers. United should be ashamed of its small seats, tiny unclean toilets, and money grubbing stance toward services, compared to Lufthansa, Emirates, and most international carriers United is awful.

Terrible. Lost our luggage for 4 days. Did not advise passengers there was a strike in Barcelona Airport and had zero personnel on hand at airport to advise passengers on where to go to file claims. We had to fend for ourselves. No assistance at all other than an online claims submission process that we had to find out about on our own.

Lufthansa cancelled our flight from Los Angeles to Naples Italy on March 10 for scheduled flight on March 12 Very stressful experience trying to arrange alternatives. Will never fly again with Lufthansa

Service and food were excellent. Incredibly friendly and competent staff. Flight was delayed over and hour and I had to run between terminals to get my connecting flight.

Late flight Delays Poor service Poor staff Worst airline ever

Lufthansa still has a good level of quality compared to US airlines, especially with respect to (1) food quality - actually tasty, (2) good French red wine - free, (3) good movie selection. Also my ticket price includes 1 free check-in luggage, while some other budget airlines sneak in an extra $150 for a checkin.

The food could be better, more snacks. And have some plugs to chargue the phone.

Everything was really great just The aircraft was too old and sounded it will break during takeoff

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

Information on your arrival and departure airports