$337 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, Nov 5 - Thu, Dec 10
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
$571Scandinavian Airlines
Fri, Nov 6 - Thu, Nov 12
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
$571Scandinavian 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 8 - Thu, Oct 15
British Airways Logo
11:05 am - 10:59 pmLIS  Lisbon Humberto Delgado-SFO San Francisco
19h 54m1 stop Philadelphia
British Airways Logo
7:30 pm - 11:05 pmSFO  San Francisco-LIS Lisbon Humberto Delgado
19h 35m1 stop London Heathrow
$766British Airways
Sat, Dec 26 - Thu, Dec 31
British Airways Logo
10:40 am - 10:11 pmLIS  Lisbon Humberto Delgado-SFO San Francisco
19h 31m1 stop Philadelphia
British Airways Logo
2:12 pm - 6:05 pmSFO  San Francisco-LIS Lisbon Humberto Delgado
19h 53m2 stops Chicago O'Hare Intl London Heathrow
$768British Airways
Tue, Sep 22 - Tue, Oct 6
United Airlines Logo
12:20 pm - 8:47 pmLIS  Lisbon Humberto Delgado-SFO San Francisco
16h 27m1 stop Washington, D.C. Dulles Intl
United Airlines Logo
6:00 am - 8:20 amSFO  San Francisco-LIS Lisbon Humberto Delgado
18h 20m1 stop Newark
$776United Airlines
Thu, Sep 24 - Wed, Oct 7
TAP AIR PORTUGAL Logo
9:55 am - 2:30 pmLIS  Lisbon Humberto Delgado-SFO San Francisco
12h 35mnonstop
TAP AIR PORTUGAL Logo
4:35 pm - 11:50 amSFO  San Francisco-LIS Lisbon Humberto Delgado
11h 15mnonstop
$800TAP AIR PORTUGAL
Thu, Oct 1 - Wed, Oct 14
Delta Logo
5:00 am - 11:45 amLIS  Lisbon Humberto Delgado-SFO San Francisco
14h 45m1 stop Amsterdam Schiphol
Delta Logo
3:05 pm - 2:55 pmSFO  San Francisco-LIS Lisbon Humberto Delgado
15h 50m1 stop Paris Charles de Gaulle
$802Delta
Thu, Oct 8 - Sun, Oct 11
Delta Logo
5:00 am - 11:45 amLIS  Lisbon Humberto Delgado-SFO San Francisco
14h 45m1 stop Amsterdam Schiphol
Delta Logo
6:20 am - 11:15 amSFO  San Francisco-LIS Lisbon Humberto Delgado
20h 55m2 stops Seattle/Tacoma Intl Paris Charles de Gaulle
$802Delta
Sat, Dec 26 - Sun, Jan 3
United Airlines Logo
5:00 am - 4:05 pmLIS  Lisbon Humberto Delgado-SFO San Francisco
19h 05m1 stop Frankfurt am Main
United Airlines Logo
11:30 pm - 8:10 amSFO  San Francisco-LIS Lisbon Humberto Delgado
24h 40m2 stops Chicago O'Hare Intl Newark
$872United 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 $571 return. The most popular connection is from Lisbon to San Francisco and KAYAK users have found round-trip deals for as low as $571 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 Thursday where round-trip tickets can be as cheap as $873. On the other hand, the most expensive day to fly is Monday, where round-trip prices are $1,885 on average.

What is the cheapest month to fly to San Francisco?

The cheapest month for flights to San Francisco is January, where tickets cost $781 on average for return flights. On the other hand, the most expensive months are July and June, where the average cost of tickets from Portugal is $1,092 and $981 respectively. For one-way flights, the best month to travel is September with an average price of $625.

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 $873 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 $1,056.

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 $717 round-trip.

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

To get a below average price, you should book around 4 weeks before departure, which saves you about 6% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 20 weeks before departure.

Good to know

Low season

May

Cheapest flight

$337
Best time to beat the crowds but there is an average 6% increase in price.
Most popular time to fly with an average 10% increase in price.
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 $571 return. The most popular connection is from Lisbon to San Francisco and KAYAK users have found round-trip deals for as low as $571 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 $882. The cheapest price found on KAYAK in the last 2 weeks cost $660 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 12,209 direct flights from within Portugal to San Francisco. The most common day for departures is Sunday, with 16% 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 $1,183
  • 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 8532 reviews
8.1Boarding
7.8Entertainment
7.8Comfort
8.5Crew
7.2Food
Airline reviews

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

10.0 ExcellentChristian, Jul 2026
Read more Delta reviews

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 mom urmila patel needed a wheelchair which was not available on the curbside. she needed to walk almost 50 meters inside (at the risk of falling) and then had to wait in line to get a wheelchair (this is not ok). Once obtained she had to seat in it for 30-45 minutes for someone to take her in thru the checkin process (which was fairly smooth and easy). the lady who helped her with her checkin process was very courteous and helpful

Awful - both legs. The check in was awful, getting on the plane required walking down a spiral staircase (dangerous), then taking a bus about 5 miles out from the terminal. The seat was broken (I was in business), there was no internet during the flight (both legs). The aircraft was very old. I saw rust in some place, tape holding things up in the bathroom. This was an unacceptable experience for such a long haul flight.

I usually get upgraded so my experience is usually amazing. I did not get upgraded this time - which was fine - but the wifi had issues, the monitors were going in & out, & (though not Delta's fault) one of the gentlemen next to me desperately needed a shower.

Middle seats SUCK!!!! I paid more money than I should have because of your terrible site Kayak.com. I'll try to use your competitors going forward. I am so disappointed you would play off business class.com as business class seats

They lost my bag and I still haven’t received it yet

The plane was old Only 3 bathrooms available for economy The entertainment was old and the selection was poor

Boarding was a disaster being moved by Air France by bus to the plane. The plane should have been at the right gate.

Flight was late over a hour just like the first one. WiFi was down.

The check in was horrible. I stood in line for 1 hour to check in with an Air France ticket. Then I was told I had to go to Delta counter onstead to check in instead. It made no sense.

Medíocre. The food wasn't good (although not bad, bad) and the staff wasn't kind. I asked for n extra blanket, the steward never came back, serving us roughly.

They wanted to close counter although they did not provide the wheelchair requested which ended by going alone to transit security and lost long time and they did not want to wait .

They charge me for luggage which is was included on the ticket

Lost luggage, 2 bags were badly damaged and one of the bags came open.

This flight did not take place because the passenger was in the hospital. We have made so many attempts to rebook this flight and have spoken to so many United Airlines representatives and everyone is giving you a different answer. It has become beyond frustrating to the point where we now have to seek legal help. This is a family of 4 so a lot of money was spent to purchase 4 tickets to go visit their daughter/sister who is a US servicewoman in Okinawa and to be treated with such disdain and disrespect is beyond reprehensible. The main traveler was given sent a letter by United confirming a refund on the tickets and to be able to use them but every attempt to use this has been met with a negative response so much so that the client is over stressed.

The pre-order only approach for fresh food is really challenging

the seat has a problem. the back had a hole.

The entire experience convinced my wife, Cathy, and me that traveling Polaris on United is the only way we’ll fly in the future. From check-in and baggage drop to the end of the 12-hour flight, the customer service was exceptional, with numerous staff members exemplifying the very best in care. On board, Andre, our primary crew chief, was sincerely friendly, a consummate professional, and, along with Freddy, one of his team members, truly among the best of the best. The captain even came through the cabin to chat with passengers—a wonderful personal touch, especially on such a long journey.

The SFO lounge closes at 12 midnight. My flight took off at 2AM

Flight be on time would be a good start. Then train your flight attendants to be attentive and friendly. This time they completely forgot my row for the measly snack! United, do better!

We boarded the plane and were about to take off when we were notified that the tires had to be checked. Upon inspection, they were found to need replacement, so the entire plane had to be deboarded. After we exited the plane, United staff forced us to stay in the gate area by posting "Do Not Exit" signs on the doors connecting the gate area to the terminal. Many of us had already rebooked our flights and had no checked bags, but they told us we could not leave. This seemed inappropriate to hold people under false pretenses. When the agent told us we could leave, I asked them to please take down the "Do Not Exit" signs, as they were misleading. The agent refused, and I told them that it didn't feel right to hold people like that.

There was a piece of plastic baked into my buttermilk biscuit! I have a pictures. The flight attendants in first class were really apologetic, and tried to rectify the situation. I I am very appreciative that they were able to give me some packets of pretzels and gummy bears. I understand they don't personally handle the food until warming it up so I know it wasn't their fault. I don't know whether it was a newer aircraft, or different food packaging, but I was happy that when the food was being warmed up - it didn't smell like plastic. Jokes on me with finding plastic in my food.

United was excellent. We had very good experience flying the carrier. Certainly. We will opt to fly them for sure. Lufthansa is out.

The seat that I got this time is really good.

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.

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.

I am a 25+ years American Airlines member. British Airways is simply above and beyond in every customer satisfaction category.

The crew were good. The flight was on time. The entertainment choice was ok. But the food was bad, tasted and texture were awful.

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Everything you need to know for your flight to San Francisco

Information on the airport you'll fly into in San Francisco