$374 Find Cheap Flights from Portugal to San Francisco - Compare and Save

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Cheap Flights from Portugal to San Francisco

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

Recent round-trip flight deals from Portugal to San Francisco

Thu, Feb 4 - Wed, Feb 24
Scandinavian Airlines Logo
4:55 pm - 2:50 pmLIS  Lisbon Humberto Delgado-SFO San Francisco
29h 55m1 stop Kastrup Copenhagen
Scandinavian Airlines Logo
4:45 pm - 4:05 pmSFO  San Francisco-LIS Lisbon Humberto Delgado
15h 20m1 stop Kastrup Copenhagen
$604Scandinavian Airlines
Thu, Dec 3 - Thu, Dec 10
Scandinavian Airlines Logo
5:55 pm - 2:50 pmLIS  Lisbon Humberto Delgado-SFO San Francisco
28h 55m1 stop Kastrup Copenhagen
Scandinavian Airlines Logo
4:45 pm - 3:55 pmSFO  San Francisco-LIS Lisbon Humberto Delgado
15h 10m1 stop Kastrup Copenhagen
$612Scandinavian Airlines
Mon, Nov 9 - Wed, Nov 25
TAP AIR PORTUGAL Logo
9:40 am - 2:25 pmLIS  Lisbon Humberto Delgado-SFO San Francisco
12h 45mnonstop
TAP AIR PORTUGAL Logo
4:35 pm - 11:30 amSFO  San Francisco-LIS Lisbon Humberto Delgado
10h 55mnonstop
$763TAP AIR PORTUGAL
Wed, Nov 25 - Sat, Dec 5
TAP AIR PORTUGAL Logo
10:00 am - 2:45 pmLIS  Lisbon Humberto Delgado-SFO San Francisco
12h 45mnonstop
TAP AIR PORTUGAL Logo
4:35 pm - 11:30 amSFO  San Francisco-LIS Lisbon Humberto Delgado
10h 55mnonstop
$764TAP AIR PORTUGAL
Mon, Nov 23 - Mon, Dec 7
British Airways Logo
8:20 am - 8:00 pmLIS  Lisbon Humberto Delgado-SFO San Francisco
19h 40m2 stops Madrid Barajas Chicago O'Hare Intl
British Airways Logo
8:55 am - 12:05 pmSFO  San Francisco-LIS Lisbon Humberto Delgado
19h 10m2 stops Dallas/Fort Worth London Heathrow
$783British Airways
Thu, Nov 19 - Sat, Dec 5
Delta Logo
5:00 am - 11:45 amLIS  Lisbon Humberto Delgado-SFO San Francisco
14h 45m1 stop Amsterdam Schiphol
Delta Logo
6:00 am - 11:25 amSFO  San Francisco-LIS Lisbon Humberto Delgado
21h 25m2 stops Detroit Metropolitan Wayne County Paris Charles de Gaulle
$784Delta
Fri, Nov 20 - Sat, Nov 28
Delta Logo
5:00 am - 11:45 amLIS  Lisbon Humberto Delgado-SFO San Francisco
14h 45m1 stop Amsterdam Schiphol
Delta Logo
3:10 pm - 3:10 pmSFO  San Francisco-LIS Lisbon Humberto Delgado
16h 00m1 stop Paris Charles de Gaulle
$784Delta
Sat, Nov 21 - Sat, Dec 5
British Airways Logo
7:00 am - 2:55 pmLIS  Lisbon Humberto Delgado-SFO San Francisco
15h 55m1 stop London Heathrow
British Airways Logo
5:25 pm - 5:55 pmSFO  San Francisco-LIS Lisbon Humberto Delgado
16h 30m1 stop London Heathrow
$788British Airways
Sat, Nov 14 - Sun, Nov 22
American Airlines Logo
6:45 pm - 8:56 amLIS  Lisbon Humberto Delgado-SFO San Francisco
22h 11m2 stops Madrid Barajas Dallas/Fort Worth
American Airlines Logo
8:47 am - 2:55 pmSFO  San Francisco-LIS Lisbon Humberto Delgado
22h 08m2 stops Chicago O'Hare Intl London Heathrow
$790American Airlines
Fri, Nov 13 - Tue, Nov 24
American Airlines Logo
8:20 am - 11:40 pmLIS  Lisbon Humberto Delgado-SFO San Francisco
23h 20m2 stops Madrid Barajas Los Angeles
American Airlines Logo
12:00 pm - 5:45 pmSFO  San Francisco-LIS Lisbon Humberto Delgado
21h 45m2 stops Los Angeles London Heathrow
$790American Airlines
Booking Insights

KAYAK's insights & trends for flights to San Francisco

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

What is the cheapest flight to San Francisco?

In the last 5 days, the cheapest flight deal to San Francisco was found on the route from Porto, at $604 return. The most popular connection is from Lisbon to San Francisco and KAYAK users have found round-trip deals for as low as $604 in the last 5 days.

What is the cheapest day to fly to San Francisco?

Based on KAYAK data, the cheapest day to fly to San Francisco is Friday where round-trip tickets can be as cheap as $880. On the other hand, the most expensive day to fly is Monday, where round-trip prices are $1,504 on average.

What is the cheapest month to fly to San Francisco?

The cheapest month for flights to San Francisco is November, where tickets cost $754 on average for return flights. On the other hand, the most expensive months are June and July, where the average cost of tickets from Portugal is $1,139 and $1,092 respectively. For one-way flights, the best month to travel is May with an average price of $759.

What is the cheapest time of day to fly to San Francisco?

The cheapest time of day to fly to San Francisco is generally in the morning, when round-trip flights cost $980 on average. The most expensive time of day to fly to San Francisco is generally in the afternoon, which is peak travel time and where the average cost of a ticket is $1,134.

What is a good deal for flights to San Francisco?

If you’re looking for cheap airfare to San Francisco, 25% of our users found tickets to San Francisco for the following prices or less: From Lisbon $795 round-trip.

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

To get a below average price, you should book around 6 weeks before departure, which saves you about 10% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 15 weeks before departure.

Good to know

Low season

May

Cheapest flight

$374
Best time to beat the crowds but there is an average 4% increase in price.
Most popular time to fly and prices are also 27% lower on average.
Flight from Porto to San Francisco

FAQs - booking San Francisco flights

  • What is the cheapest flight to San Francisco?

    In the last 5 days, the cheapest flight deal to San Francisco was found on the route from Porto, at $604 return. The most popular connection is from Lisbon to San Francisco and KAYAK users have found round-trip deals for as low as $604 in the last 5 days.

  • How far is San Francisco Airport from central San Francisco?

    There are 11 miles between San Francisco city center and San Francisco Airport.

  • What is the name of San Francisco’s airport?

    When flying to San Francisco, you'll arrive at San Francisco Airport (SFO). The airport is also known as San Francisco or San Francisco Intl.

  • How much is a flight to San Francisco?

    On average, a flight to San Francisco costs $918. The cheapest price found on KAYAK in the last 2 weeks cost $740 and departed from Lisbon Humberto Delgado Airport.

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

    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 to San Francisco.

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

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to 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 to San Francisco?

    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 San Francisco with an airline and back with another airline.

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

    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 San Francisco up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

  • How many direct flights to San Francisco are there each week?

    Each week there are around 18,295 direct flights from within Portugal to San Francisco. The most common day for departures is Sunday, with 18% of flights taking off on this day.

Top tips for finding cheap flights to San Francisco

  • Looking for cheap airfare to San Francisco? 25% of our users found round-trip tickets to San Francisco for the following prices or less: From Lisbon $1,109

  • Enter your preferred departure airport and travel dates into the search form above to unlock the latest San Francisco flight deals.

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

 
Need help choosing which airline to fly with to San Francisco? 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.
7.8
DeltaOverall score based on 8695 reviews
7.8Comfort
8.1Boarding
8.5Crew
7.2Food
7.8Entertainment
Airline reviews

attendents were rude and the boarding was disjointed and poor

4.0 OkayChristopher, Oct 2026
Read more Delta reviews

attendents were rude and the boarding was disjointed and poor

After boarding the plane had to wait an hour at the for the copilot to show up before we could depart

Great crew. Comfortable seating. Nice overhead bin space. My app didn't allow me to check in for my flight to BOS. When I called Support, they didn't fix it, but just told me to check in at the airport. Seat back entertainment was great. Could be better if the audio could connect to Bluetooth.

The flight was done by SkyWest only WIFI no entertainment center are available on the CRJ

Delta is always late. Ruined our first day of a short vacation. Timing is important. We pay to stay on an itinerary

We sat on the runway for over an hour before departure. That was unwelcome.

Everything went smoothly, although the usual gripes about airline travel were still present: the boarding process is inefficient, the snack selection is limited, and so on. Since there was extra space on the flight, the gate agent rearranged many people's seats to put people on the aisles and windows, leaving the middle seats empty, as much as possible, which was pretty great.

One of the flight attendants was a little cranky. I appreciated the free wifi and plug to charge my laptop

WiFi didn’t work most of the time. The usb chargers would work only occasionally for 5 mins and wouldn’t charge after that. Had to keep trying repeatedly at each of the seats in the row.

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

My flight from Boston to SFO was fine. Crew was friendly and helpful. Food was mediocre. Fright from SFO to MNL was not as good. My flight attendant was friendly but didn’t seem to have a lot of experience. She seemed overwhelmed. Also, this was the only red eye business class flight I’ve flown which only served dinner 2 hours after takeoff in a 13 hr flight. When I woke up 1 hr before landing, everyone was eating so I assumed bkft was being served. I pushed my button for help and no one came so I approached my flight attendant and she said they don’t serve bkft but she gave me choices for lunch or dinner. I routinely fly business class but I was disappointed with the lack of service and attention I was given on this flight. Also, most airlines will offer a snack or coffee before bkft is served but this was not offered during this flight. Overall, it was disappointing.

The food could be much better. Also very unfortunate that most of business class seats were empty but I could not upgrade.

Bag got checked but I thought one personal item was guaranteed.

The seats are very small, that is all the staff did a good job.

The flight was for my mom in wheelchair the staff in Newark wer not friendly took a long time to even get a wheelchair she almost missed her flight because they finally got a chair few minutes before boarding they had to rush her to the gate. They took her carryon and checked it as a bag told her don’t worry free of charge but they charge the credit card anyway. She also told me the seats are not comfortable at all as if they were broken she could feel the bars in the seat SFO staff was much better overall she had the worst experience

First class flight crew was barely available. They came through 3 times while we were on the plane for nearly 4 hours.

United did nit provide any updated on flight crew not bein available until boarding time started. It was bad. Itws alate night flight and there no proactive communication and iha d an important meeting that i missed due to thus

Delayed too much. 1.5 hrs in the airport and another 1 hr in the runway. Got too late in the night. There was no proper food available.

For the Singapore to CA flight, nearly 16 hours long was miserable. We sat on the tarmac for one hour to burn fuel. The flight attendant girls were mean. They would yell at people who stood up to try to stretch their legs. One time the drinks came thru and the lady judged us and made a comment about how much sugar was in apple juice when we ordered it once. She was rude and inappropriate. The entire flight was frustrating. You'd think a long haul like that the airline would try to make you comfortable. I just don't understand why the ladies were so snappy. I have never experienced rude flight attendants like that. It was the longest flight I've had to sit on before. We were not impressed. Raymond on the other hand was amazing! By far the best person working that flight!

premium economy is expensive but worth it for the comfort and food on a long flight

Excellent! Flight left a bit late but overall a pleasant experience.

Business class seats aren't comfortable. Food was not good.

The layover was only one hour and a huge line for passport control. If I didn’t cut the line and argue was every single official, I would’ve spent the night in this one. Obviously.TAP AIR people. do not take into account.this problem with their flight scheduling, which is extremely frustrating. Poor food choices, on the pasta was offered, they ran out of chicken right away. All the sodas and water poured in a tiny 70 mL cups, which is not enough to keep hydrated on the long flight. I had to ask for 34 cups at a time. Flight attendant seemed to be tired and overworked.

Got in on time. Food was the worst ever. Comfort was terrible. Check in was incredibly bad.

Flight delays. Mad rush with no help from staff. Staff for TAP is elusive like the Tasmanian devil... you hear about it but never seen it. Seats were the only thing that was ok as its lie flat, but trying to sleep was like being at a concert as the crew were chit chatting non stop while you are trying to sleep. Food was seriously better in Premium EY on other airlines like Singapore Airlines, Lufthansa, United. We traveled Business Class on TAP. Crew were friendly enough but not very present at lull period of flight.

Crew woke me up to see if I wanted food - NEVER want food on a 12 hour flight more than I want to sleep. Sleep was not easy, as a child screamed and threw fits 70%of the flight. That same child kicked my seat most of the flight. BUT, despite the child and a poor boarding effort, the rest was solid. The crew worked hard otherwise - just don’t wake me up IF I actually get to sleep.

Way too much money for the experience, would have been better in economy

It was excellent - good value; good service. No complaints; my sister moved to Portugal so I will be flying there annually and will continue to use TAP. I love that I can get nonstop flight from SFO to Lisbon.

If you miss any flight in a Multi-City flight plan with TAP, all remaining flights will be automatically terminated immediately. Their support line is no help at all, and you'll be stuck paying again for another flight.

the cancellation of my earlier flight caused me to miss this connection as well.

Cabin staff were very disengaged, spoke with no eye contact, dismissive. Disappointing compared to my United experiences.

The seat configuration was insane. Horrible. Had to jump over sleeping people to go the bathroom. The food was the best we’ve had in any Business class.

I liked that 5 pound refreshment voucher was given for 1 hr delay. Staff were courteous and professional. I was expecting more for the 2nd meal (pizza). Usually for a long flight, the 2nd meal is something like eggs/sausage/potatoes/fruit/dessert.

I am absolutely furious with American. they shut the door in my face when I was trying to board the flight and kicked me off of it. They made no attempt to call my name or contact me or anything. They just said they gave my seat away. The customer service response has been atrocious. I will never fly this airline again as long as I live.

Old dirty plane but great lie flat seats in business class

Worst experience ever, extremely disorganized airline with super rude crew for first class passengers. I have submitted feedback to AA customer care online that this was my worst experience traveling in over 30 years

Our experience with American Airlines was extremely disappointing and honestly made an already exhausting international journey much worse. After flying all the way from Melbourne and dealing with significant jet lag, the American Airlines experience at LAX was the last thing we needed. The terminal and boarding area felt very old and uncomfortable, with little to no air conditioning and only old fans running in the area. Boarding was also through outdoor stairs rather than a jet bridge, which felt especially inconvenient after such a long journey. Even though we were traveling First Class, the onboard experience was surprisingly poor. There were no meaningful snack options, no decent coffee available to order, and the aircraft was so small that there was barely enough overhead space for carry-on luggage. The staff experience was also disappointing and lacked the warmth or attentiveness we had experienced on our international flights. To make matters worse, the flight departed late, extending an already very long travel day. Overall, the combination of the outdated terminal, uncomfortable boarding process, limited First Class service, small aircraft, poor staff experience, and delay made this an extremely unpleasant final leg of our journey. It significantly worsened our exhaustion and jet lag rather than making the connection home easier. Unfortunately, this experience was bad enough that I do not plan to travel with American Airlines again in the future.

Horrible. No AC. No Air inside the plane. We had to deplane twice! It is late almost 5 hrs in total. I almost passed out and about to call 911. I asked the crew to be honest and open the door. The lady next to me was lay down in the floor due to heat and no air inside the plane. I got headaches, can’t wait the replacement flight about midnight Dallas time. I end it up rebook for next day flight and stay overnight using my own pocket in a hotel nearby due to headaches and can’t breath. I still have a headache this morning. Still not decided yes how to file this issue to AA and/or FAA.

I could not ask for more. Great service and experience.

Initial flight had an engine overheat - returned to DFW. Had another plane ready, but crew timed out. Had to wait 5h for boarding. Fully boarded and pilot says plane is not flight worthy. Deplane and go to the other end of the terminal. Wait an hour to board third plane because the crew couldn’t leave the second plane because no wheelchairs were brought to remove passengers. Finally take off and there is no catering (in flight service) even in first class. Very much an AA failure.

My experience on this flight was good. The seat I had had a lot of leg room, but it was so close to the aisle that the flight attendants kept bumping into my visual monitor connected to my seat to watch tv.

We never made this flight due to the flight from Barcelona being delayed, which I have reviewed in a separate review. But I can tell you that the Delta Airlines flight that did get us home, I am extremely happy with them and their crew. The only one person that I would praise within the entire part of BA is the girl I spoke to in the call center in India. Who completely understood, was dedicated to a resolution and was a complete realist in the situation. Unlike some of the people who don’t care about the human element and stick you on a flight whenever. She got us home.

Generally very good. I think their service is better than some other big names I used to travel with. Their food variety is second to none - and you can place order beforehand. Their seating design is a bit awkward for service, I'd say. Flight attendants must be tall enough - long legs and arms - to reach the window seat passenger while crossing over the isle passenger. Also appreciated the variety on entertainment.

Lovely big plane. Excellent take off and landing. Cabin crew were so nice. Flight in time no delays

The crew has always been great on BA. They are very friendly and accommodating. I like that they have vegetarian options already in the menu. And the free wine is a nice perk.) I noticed (both directions of my trip) minor upgrades/ replacements needed on the plane itself (touch screen didn't work with touch; bathroom light didn't go on). However, this is one of my favorite airlines.

There was a delay for the San Francisco-London flight, but we were all informed via text and email. The staff was very friendly and nice and the food was good. I do recommend that the airline offer something without eggs or something vegan for the vegetarian meal option. A lot of Indians are lacto-vegetarian, while some could be allergic to eggs/dairy.

Audi visual not working for a whole group of seats in first class. How does a plane leave the main hub in such poor condition? How much that we can’t see so immediately is also compromised?

main meals are horrible but then you dont fly for the food

Great flight. One unique individual assisting in business class who should have not been there. Need more generic meals, not British centric.

It was good although our flight to the UK was cancelled and rescheduled for two days later. This was after we were already seated on the plane. We missed the first leg of our trip. BA did put us up at a hotel and paid for our meals but we lost our hotel costs in Glasgow.

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