$279 Find Cheap Flights from Portugal to San Francisco

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight to San Francisco departing on 3/30. 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 San Francisco

 
These are the airlines KAYAK users have selected most often from within our search results for flights to San Francisco
These are the airlines KAYAK users have selected most often from within our search results for flights to San Francisco
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Everything you should know

Cheapest round-trip
$489
Overall average: $771
LEVEL
Mon 4/13Sun 5/31
LIS - SFO • 1 stop
Cheapest non-stop
$669
Typical prices: $652-$850
TAP AIR PORTUGAL
Mon 2/2Sat 2/7
LIS - SFO • Non-stop
When to travel
February
Cheapest • 19% price drop
August
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
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KAYAK searches 100s of sites at once to find you the best travel deals.
We hope you love your trip to San Francisco!
Flight Deals
Booking Insights
Flight Deals

Cheap Flights from Portugal to San Francisco

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Portugal to San Francisco 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 Portugal to San Francisco

Mon, Apr 13 - Sun, May 31
LEVEL Logo
9:20 pm - 5:55 pm
LIS
-
SFO
28h 35m
1 stop
LEVEL Logo
7:40 pm - 1:20 pm
SFO
-
LIS
33h 40m
1 stop
$489LEVEL
Wed, Apr 15 - Tue, Apr 28
Multiple Airlines Logo
9:15 pm - 5:55 pm
LIS
-
SFO
28h 40m
1 stop
Multiple Airlines Logo
7:40 pm - 7:05 pm
SFO
-
LIS
15h 25m
1 stop
$496Multiple Airlines
Wed, Apr 15 - Thu, Apr 23
Multiple Airlines Logo
9:15 pm - 5:55 pm
LIS
-
SFO
28h 40m
1 stop
Multiple Airlines Logo
7:40 pm - 11:40 pm
SFO
-
LIS
20h 00m
1 stop
$506Multiple Airlines
Wed, Apr 22 - Tue, May 5
Multiple Airlines Logo
9:15 pm - 5:55 pm
LIS
-
SFO
28h 40m
1 stop
Multiple Airlines Logo
7:40 pm - 8:35 pm
SFO
-
LIS
16h 55m
1 stop
$509Multiple Airlines
Mon, Mar 9 - Sun, Mar 22
Scandinavian Airlines Logo
5:35 pm - 3:35 pm
OPO
-
SFO
29h 00m
1 stop
Scandinavian Airlines Logo
5:40 pm - 4:45 pm
SFO
-
OPO
16h 05m
1 stop
$570Scandinavian Airlines
Mon, Mar 9 - Sun, Mar 22
Scandinavian Airlines Logo
5:35 pm - 3:35 pm
OPO
-
SFO
29h 00m
1 stop
Scandinavian Airlines Logo
5:40 pm - 4:45 pm
SFO
-
OPO
16h 05m
1 stop
$571Scandinavian Airlines
Mon, Mar 9 - Sun, Mar 22
American Airlines Logo
8:20 am - 10:32 pm
OPO
-
SFO
21h 12m
2 stops
American Airlines Logo
6:30 pm - 8:00 pm
SFO
-
OPO
18h 30m
2 stops
$646American Airlines
Fri, May 15 - Mon, May 18
American Airlines Logo
12:25 pm - 11:17 am
OPO
-
SFO
30h 52m
2 stops
American Airlines Logo
7:00 am - 4:00 pm
SFO
-
OPO
25h 00m
2 stops
$659American Airlines
Fri, Feb 27 - Sat, Mar 7
TAP AIR PORTUGAL Logo
4:10 am - 2:45 pm
FNC
-
SFO
18h 35m
1 stop
TAP AIR PORTUGAL Logo
4:35 pm - 5:10 pm
SFO
-
FNC
16h 35m
1 stop
$734TAP AIR PORTUGAL
Sat, Feb 28 - Sat, Mar 7
Lufthansa Logo
1:10 pm - 12:40 pm
FNC
-
SFO
31h 30m
2 stops
Lufthansa Logo
7:00 am - 1:40 pm
SFO
-
FNC
22h 40m
2 stops
$1,017Lufthansa
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 month to fly to San Francisco?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for flights to San Francisco, 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 to San Francisco is February, where tickets cost $654 on average for one-way flights. On the other hand, the most expensive months are July and August, where the average cost of tickets from Portugal is $880 and $873 respectively. For return trips, the best month to travel is February with an average price of $655.

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 $859 one-way - $1,644 round-trip.

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

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights to San Francisco, 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, you should book around 1 week before departure. For the absolute cheapest price, our data suggests you should book 87 days before departure.

Good to know

Low seasonFebruary
Cheapest flight$279
Best time to beat the crowds with an average 8% drop in price.
Most popular time to fly with an average 7% increase in price.
Flight from Lisbon to San Francisco

FAQs - booking San Francisco flights

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

    There are 12 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 $1,476. The cheapest price found on KAYAK in the last 2 weeks cost $647 and departed from Lisbon Humberto Delgado Airport.

  • What is the cheapest day to fly to San Francisco?

    Based on KAYAK data, the cheapest day to fly to San Francisco is Wednesday where tickets can be as cheap as $810. On the other hand, the most expensive day to fly is Saturday, where prices are $1,384 on average.

  • 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.

  • 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 flights cost $872 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 $1,327.

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 $1,747
  • 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

 
See real verified KAYAK customer reviews for airlines flying to San Francisco. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline from Portugal to San Francisco. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
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.
7.9
DeltaOverall score based on 8058 reviews
7.8Entertainment
7.9Comfort
8.5Crew
8.1Boarding
7.2Food
Airline reviews

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.

4.0 OkayLauren, Jan 2026
ATL - SFO
Read more Delta reviews

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.

I really liked the legroom. I am 6’4”.a at For some reason our seats were not together and using the app to fix it didn’t work. Passengers were nice enough to move for us but you should absolutely ensure a parent sits with their child.

Staff were friendly and happy. Delta could make sure passengers that don't have the app know of changes. Without Kayak I would not have known about the change of gate or the delay. Kayak was faster to notify me.

They changed planes and the new plane couldn’t carry enough fuel to fly across the country so we had to stop in Kansas City to refuel. Flight was delayed .

Flight was too crowded and seats are too small, especially since passengrs are getting larger. Having a middle seat is ALWAYS tough! Woman on my left was large & kept creeping in to my space. Flight personnel were great! Have more savory rather than sweet snacks please.

The crew took good care of us. The flight from ATL to SFO is a longer one, and there were multiple beverage offerings. I like the 757's that Delta uses. Good airplane that is comfortable. I do wish Delta would separate Priority boarding from the better seats. I would gladly take a smaller seat in an open row than be jammed into Comfort just to get priority boarding, just to make sure I don't have to check a bag.

The crew was not very visible. This might be a good thing for people who wanted to sleep but seemed odd when compared to the Atlantic crossing where they are more present in the cabin. The Food (beef) was not good. Tough and tasteless. Would love to see more choices on a long flight like that.

Gate agent rushed to fill hot jetway with crowd so it took over 12 minutes to go from gate to plane. Just like a discount airline Pooly prepared cabin and third time that claim of rough air prevented any cabin service. Friends on a Southwest flight at similar time had service.

The flight crew was friendly. I tried to adjust my seat online ahead of time but no option existed without additional fees. My friend asked at the gate about a seat change and was able to make it happen. That was great! The flight crew moved a very tall gentleman and his companion which allowed us to have more space which was nice. Overall, good experience. Appreciated the blanket and pillow.

I was uncomfortably cold on the plane. Other than that it was uneventful and therefore as enjoyable as a plane ride can be.

Yet another flight in which beverage and snack service was skipped. Other that that, firmly mediocre. Landed early, to gate late due to congestion at the gates. Airline's fault or airports fault: unknown.

Both flights delayed. 2nd flight over 3 hours late mechanical issues

It was good but only meal served is very less. Meantime good to add rice and chicken in one of meal

Teeny tiny bathrooms, crew was not realistic about when we'd arrive.

On the way my flight entertainment wouldn’t work the screen went black and no matter how many times I tried to turn it on it wouldn’t. Food was surprisingly good but the tray tables were tiny so you couldn’t get anything else on the table. The seats hardly go back and are not overly comfortable. Wouldn’t fly United again.

Flight was late - I was downgraded from first class to coach

Movie selection is good. Crew did not understand mileage program and were no help. Sick later. Food?

United needs to step up their game. Delayed flight leaving Seattle, San Francisco. Older aircraft, not very comfortable.

The flight attendants were very rude, beyond comprehension. I took a business class from London to SFO for the first time on United. When I asked for a second piece of bread during dinner, the serving attendant threw a 3rd bread on my plate and said, “here. You can have this one too”! I couldn’t believe the rudeness of the attendant. Most all attendants were very rude, unhelpful, sing the food was absolutely disgusting. Never fly United internationally in business class. My flight back to SFO was a nightmare!!

7 hours delayed due to operational issues on United’s end. Basically laziness.

Negative. Food was awful, seat broken, flight was late, baggage lost and damaged

The ground staff did not load my bag onto the plane and despite me watching from the bus that my bag is not being loaded and taken back on the cart to the terminal, I pointed out to the staff and ge laughed upon checking my tag and knowing they made a mistake. Instead of calling the cart back and loading it he said we can’t fo anything and you should file a report upon landing at RAK. I told them my stay there is short and i needed my bag as it had everything I needed but no avail. Even the pilot was informed, staff of the plane was aware but all in don’t care mode. Upon arriving at Marrakech RAK, i filed a report and being told it might come in next flight tomorrow and we don’t provide delivery service, you must come and pick it up. If it doesn’t arrive on time then it will be sent to your home in the US. Unbelievable stress and inconvenience that could have been easily prevented by the ground staff.

The cabin crew were curt, not with me, but observed with other passengers. They were unduly rude and it was unprovoked and when they realized they were wrong, they made no attempt to apologize for their own confusion.

I was disappointed of the crew, not friendly and attentive. Delay one way for fuel leakage and the plane is so hot. Not that great all around but I’m glad I experienced it so now know better.

Flew Business class and did not like anything, flight attendants were rude and not helpful. Food was of poor quality and I did not eat meals.

Wonderful just hope the had more direct flights to Boston

Boarding process was fast and efficient. Short flight but on time and well organized. I would certainly fly TAP again.

Very long line at the gate, moved slowly. I had expected that boarding a flagship A330neo would be with a jetway directly at the gate, and not a long bus ride to the airplane.

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.

Very borderline, low budget airline without low budget prices There are no counts of soda, everything is dispensed enlarged bottles and poured into tiny cups about 70 mL so in order to keep hydrated you have to take 3-4 cups at a time. Also, there was only one food item offered, pasta, they ran out of chicken right away. Snack was very poor. It was called tuna sandwich, which is truly borderline. The flight attend attendance seemed to be overworked and tired.

Some of the crew was sassy and not super helpful. The food was okay, but it seems like they were all unprepared compared to my flight I did from JFK to Frankfurt

We missed our flight. There was not enough time built into the layover to get through immigration, customs, bagclaim, bag rechecking, and the long trip to another terminal and gate. Kayak really screwed up. We took the bus up to Wisconsin and then were picked up in Brookfield by private car. It was lucky we didnt miss the last bus out.

We were in premium economy seats that appeared to be locked in plae, No reclining. My aching back.

I don’t understand how they charge as much as they do for such a poor experience

Lufthansa flight LH04414 from Munich to Washington DC, was fine. Efficient and safe!

I wish the plane had pod seating for business class. I had a window seat (8K) and I had to climb over the person sitting on the aisle when I needed to get up. Also there is no partition between the seats for privacy when sleeping. The Asian airlines have much nicer business class seating. Their seats are wider for better comfort when sleeping.

Bumpy ride, not Lufthansa‘s fault. Crew managed a situation over a back rest to far down well. It was two iles behind me. The person putting the seat down, against the other person’s knees, was quite rude and belligerent and needed to be told in a no nonsense matter to stopp. Male flight attendant did good job.

Patrick and the whole crew were amazing! Hope to have this team for all my European trips.

This review is based on 2 things: 1. The lack of hygiene on the plane. 2. William - the head flight attendant. The lack of cleanliness on the plane upon arrival was appalling. Being given a sanitizing wipe upon boarding of the plane is shocking when you consider the cost of a business class flight. UA expects me to do their job and clean all the bread, food and debris left from previous guests. Does this sound normal to you. The seat, the food table and the sides were full of crumbs, chocolate and dirt. When I told the flight attendant they just gave me more wipes so I could clean it myself. Secondly, William the business cabin head flight attendant was so busy flirting with a couple in the front that his attention to the other guests was minimal. He continuously asked them if they were ok or if they needed anything and it didn’t matter if the rest of us needed anything. And if you are the lead attendant shouldn’t you be checking if the bathrooms in business class are clean and needing toilet paper. There were 2 bathrooms in business. Halfway through the flight the first bathroom was closed and the second bathroom was dirty and had no toilet paper one hour and a half before the flight landed. He needs additional training on prioritizing things. He should care less about flirting and more about his work

Booked seats (paid extra) online and found they didn’t exist on the flight. We were then separated from the rest of our party. Given seats in the very back of the plane. We will not fly Discover or Lufthansa again. We will not book flights or travel through Kayak again!

My touch screen at my seat wasn't working, the films BA advertised on the website for this flight were not available, and the plane was a little dated, food was good and the staff were good, just let down by the aircraft facilities.

Did not like the seating configuration at all with 2+3+2 in business class. Lacking total privacy and comfort

The flight crew was kind, flexible, and accommodating. The seats on the plane were extremely uncomfortable.

Check-in experience, for business call please provide a premium experience

Lost my luggage, ran out of food choices in business class, ground crew was completely unapologetic.

Excellent. The crew and flight were great. Checking in was easy and everyone was very helpful.

Entertainment devices on A380 need to be fixed, the seats might do with updates.

Everything. Employees offered to help me because I had to use a cane.

Check-in and boarding were great. On flight staff were rude and disrespectful. Paid for extra room and found it incredibly cramped. Bathrooms kept in poor condition. Overall negative experience.

Great seat in premium economy, great food and drinks throughout lots of in flight entertainment. 1 hour 40 min delayed flying out , 2 1/2 hour wait at passport control in tampa

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Everything you need to know for your flight to San Francisco

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