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OPO - SFO

Find cheap flights from Porto to San Francisco from $299

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Porto to San Francisco departing on 10/24. 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
0 bags
Fri 6/7
Fri 6/14

Search 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 in flight searches from Porto to San Francisco, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Porto to San Francisco, as well as popular online travel agencies
In the last 7 days travelers have searched 43,968,530 times on KAYAK, and here is why:

Save 21% or moreCompare multiple travel sites with one search.

Track pricesNot ready to book? Create a price alert for when prices drop.

Filter your dealsChoose cabin class, free Wi-Fi and more.

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Cheap flight deals from Porto to San Francisco (OPO-SFO)

Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Porto 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 and deals for you by selecting your travel dates.
Choose your dates
7:00 am - 2:35 pmOPO-SFO
15h 35m1 stop
4:40 pm - 5:00 pmSFO-OPO
16h 20m1 stop
$582TAP AIR PORTUGAL
Find Deal
Thu, Oct 24 - Mon, Nov 4
8:35 am - 6:10 pmOPO-SFO
17h 35m1 stop
8:10 pm - 7:35 amSFO-OPO
27h 25m1 stop
$605Vueling
Find Deal
Tue, Sep 17 - Thu, Oct 3
8:35 pm - 5:25 pmOPO-SFO
28h 50m2 stops
4:30 pm - 7:40 amSFO-OPO
31h 10m2 stops
$609Iberia
Find Deal
Thu, Oct 24 - Mon, Nov 4
2:05 pm - 2:35 pmOPO-SFO
32h 30m2 stops
4:40 pm - 9:55 pmSFO-OPO
21h 15m2 stops
Thu, Oct 24 - Mon, Nov 4
8:15 am - 4:30 pmOPO-SFO
16h 15m1 stop
6:13 am - 6:10 pmSFO-OPO
27h 57m2 stops
$670British Airways
Find Deal
Tue, Sep 17 - Thu, Oct 3
8:15 am - 12:14 amOPO-SFO
23h 59m2 stops
6:13 am - 6:10 pmSFO-OPO
27h 57m2 stops
Tue, Sep 17 - Thu, Oct 3
7:20 pm - 4:05 pmOPO-SFO
28h 45m1 stop
5:25 pm - 12:20 pmSFO-OPO
58h 55m2 stops
$687SWISS
Find Deal
Thu, Oct 24 - Mon, Nov 4
2:05 pm - 2:35 pmOPO-SFO
32h 30m2 stops
4:40 pm - 7:55 amSFO-OPO
31h 15m3 stops
Thu, Oct 24 - Mon, Nov 4
11:35 am - 2:35 pmOPO-SFO
35h 00m3 stops
4:40 pm - 6:50 amSFO-OPO
30h 10m3 stops
Thu, Oct 24 - Mon, Nov 4
3:05 am - 4:05 pmOPO-SFO
21h 00m1 stop
7:40 pm - 7:45 amSFO-OPO
28h 05m1 stop
$1,436SWISS
Find Deal
Sun, Jun 30 - Tue, Jul 9

Flights from Porto to San Francisco - Travel Insights & Trends

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

What’s the cheapest day of the week to fly from Porto to San Francisco?

The average price of all flights from Porto to San Francisco clicked on KAYAK for each day over the last 12 months.
Your flight ticket price will generally be cheaper if you fly to San Francisco on a Monday and more expensive on a Sunday. On your return trip to Porto, you should consider flying back on a Thursday, and avoid Fridays for better deals.

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

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for flights from Porto 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 from Porto to San Francisco is December, where tickets cost $659 on average. On the other hand, the most expensive months are July and June, where the average cost of tickets is $1,157 and $1,046 respectively.

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

To calculate daily average prices, KAYAK takes all prices for each day before departure over the last year for flights from Porto to San Francisco, removes the top 0.1% to account for outliers, and then takes the average of all the values for each month.
To get a below average price on the flight from Porto to San Francisco, you should book around 2 days before departure. For the absolute cheapest price, our data suggests you should book 25 days before departure.

Which airlines provide the cheapest flights from Porto to San Francisco?

The cheapest price for the route for each airline clicked by KAYAK users in the last 72 hours.
In the past 3 days, the cheapest one-way tickets to San Francisco from Porto were found on Vueling ($299) and TAP AIR PORTUGAL ($358), and the lowest round-trip tickets were found on TAP AIR PORTUGAL ($582) and Vueling ($605).

Good to know

Low season

January

High season

November

Cheapest flight

$299
Best time to beat the crowds with an average 18% drop in price.
Most popular time to fly and prices are also 19% lower on average.
Flight from Porto to San Francisco

When to book flights from Porto to San Francisco

Are your dates flexible? Find out the best times to travel from Porto to San Francisco 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 Porto to San Francisco

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

    In the last 3 days, the lowest price for a flight from Porto to San Francisco was $299 for a one-way ticket and $582 for a round-trip.

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

    A passport is required to fly from Porto to San Francisco.

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

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

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

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

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

    The two airlines most popular with KAYAK users for flights from Porto to San Francisco are Delta and American Airlines. With an average price for the route of $729 and an overall rating of 8.0, Delta is the most popular choice. American Airlines is also a great choice for the route, with an average price of $1,042 and an overall rating of 7.3.

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

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

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to San Francisco from Porto 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 Porto 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 to Porto with another airline. Booking your flights between Porto and SFO 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 Porto 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 from Porto up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

See more FAQs

Top 4 airlines serving from Porto to San Francisco

 
See real verified KAYAK customer reviews for airlines flying from Porto to San Francisco. 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 Porto 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.
8.0
DeltaOverall score based on 10789 reviews
8.2Boarding
7.4Food
8.6Crew
7.9Comfort
8.0Entertainment
Airline reviews

There was a loud squeaky sound the whole time we were flying.

6.0 GoodEliza, Apr 2024SAN - LAX
Read more about Delta reviews

There was a loud squeaky sound the whole time we were flying.

Had a broken tray in business class. Crew just shrugged it off.

I didn’t like that I could not select my seat and was assigned a seat when I checked in at LAX

Great experience overall. Check in at Austin was congested as they only have about 6 check in kiosks, one was broken, and there was a lot of Spring Break travelers.

I was sitting at comfort +. One of the Asian male crew was so loud when he delivered service. When he asked questions or what food you need, he was shouting. He must be a prison guard before going Delta.

Bag drop off was slow and annoying. Only 2 agents at the entire delta desk, and no one directing traffic for what line to be in, many confused people slowed down the process. Boarding was fine. Seats in Delta comfort plus were fine. Snacks were great! Definitely a bonus. The entertainment system was awful — old, slow, not responsive, and completely unable to play games due to some kind of error. But on the other hand, thank you to Delta for the free WiFi. That made it better.

Everything was very good other than I had selected a specific seat when I booked the flight and they changed it once I checked-in the day before my flight. I was still in first class but lost my aisle seat for a window seat. Being tall, the aisle offers more comfort so I always select an aisle seat.

Flight diverted in SD. Later take off in Seattle by 1.3hrs

Space and comfort was good. Staff could have been more helpful and friendly.

Crew was not friendly when I went to request a seat change.

Somehow I got “offloaded” even though I had my boarding pass and was in transit Food is horrible Staff were nice and cheerful No headphones were provided on 11 hours flight

Fight crew was not very attentive and the bastions were gross!

Our flight was great we left Kona earlier and got into LAX almost an 1hour earlier as well. LAX AA is in repair so to get out and found our bus to get pick up was a bit confusing.

Plane was good but was delayed. probably not AA fault but caused a 1 hour delay. Seating was cramped.

The staff were very helpful with lots of refreshments on offer. The toilets were clean. The seats were comfortable and entertainment was good. No complaints, it was excellent.

amazing! they were so kind and allowed us to sit on empty seats so we could stretch our legs and sleep good. Food is amazing as well plus dessert in the middle of the flight!

5 hour flight - full flight - not enough room to use my computer - slightly delayed - Admirals club was excellent quality food, drink made up for flight seating. No food offerred on flight, you ahd to prebook.

We experience delays on departure and connecting flights resulting in 14 hour to our next departure. We were accommodated with a night's stay but was only provided a 12 dollar meals accommodation. The airlines rules state.at least 50 dollars. In any case, it can not make up for the whole day missed on our vacation in Sydney Australia.

I can say I will not be taking this airline again any time soon. Seat were uncomfortable and too tight. Lack of chair screen and little overhead space.

American Airlines canceled the flight twice and was unable to facilitate a change of city for us after our travel plans became affected. We lost alot of money due to this and it seems like the airline was trying their best not to facilitate this. Mind you, I am a very loyal member.

Touchscreens do not work. WiFi did not work. Food is possibly the worst on any European airline. Drinks came by only four times on a cross-Atlantic. The plane was two hours late because—it was announced—Lufthansa didn't have enough large aircraft in their fleet to accommodate an on-time flight.

It was freezing in the airplane. Everyone was wearing everything they had with them. The crew acknowledged it was cold, but did nothing about it

The flight attendants were superb and the service was outstanding. Some passengers with small children were very rude and inconsiderate, kids were constantly crying and some were running around the aisle unsupervised.

Terrible. There was a rattling noise the whole flight. The internet didn't work after I paid. Boarding is very disorganized.

Horrible flight attendant in back of economy that screamed at me, have already reported to United. Horrible food - for Gluten free, why would you assume the person is vegetarian? I was served some kind of horrible curry bean paste and multiple cold rolls and soggy vegetables with no seasoning... um no!

The crew member put her luggage and boxes behind my seat so I was able to recline while the passenger in front of me did for 8 hours. My knees were forced against the seat for hours :(. Dude sitting next to me hasn't showered in weeks so I almost threw up.

Sorry my last review for prg to fra was for this flight. My prg to fra flight was fine but my second flight back to Washington DC was with a slow awful crew who wouldn’t come in a timely manner to take trash and take trash before serving coffee tea and was shoving other people’s bottles of water on me when we were not traveling together

Lufthansa was amazing. Definitely upgrade your seat if you can swing it - they take very good care of their passengers. Customs in DC is nothing short of a nightmare though. Stood in line waiting to go back through security for 30 minutes, had to RUN through and across two terminals to make my connection and only had 5 minutes to spare. Terrible. Very very poor coordination by the airport staff and CBP.

I was ver pleased with the service all the way through

I always try to book flights that don’t charge for baggage. Yet I was charged $75 for this flight.

Coach seats are too tight. Seem designed for small people. Food different but OK. Staff helpful.

my original flight was cancelled the previous day, and i was rescheduled onto this flight, which left much earlier in the morning, impacting my previous evening and requiring me to get up much earlier in the morning to get to the airport online. This practice happens way way way too much, and it seems on every airline, though AA is probably the worst.

Spending 10 hours on a flight with no video or wifi access due to issues per stewardess was not enjoyable nor acceptable. Will follow up directly with the airline as well

I really did not like being ordered to pull my shade down by the attendants. One of them was very rude to me about it, standing there until I closed it like I was a child brusquely reaching across me to close an adjoining one. They claim it was so people who wanted to could sleep. It’s a 10:30am flight not a red eye. Closing your shade or leaving it up for natural light should be a choice. Ruined my flight!

My baggage did not arrived with me. Took 3 days to get it after so may calls and follow up

The crew was very attentive and kept busy serving a variety of treats!

Terrible. Flight was 3 hours delayed and I missed my other flight to my final destination

Offered vegetable curry when it was actually tofu which I don’t care for.

The flight was good the crew excellent…but take off delayed three hours!!!

Both mine and my husband's chairs were broken. Also it took 2 hours to get our bags after our flight which was wild.

Book cheap flights from Porto to San Francisco

Recent one-way flight deals

 
Only flying one-way? Below are some of the best one-way flight deals from Porto to San Francisco found on KAYAK in the last 72 hours.
10/24Thu
1 stopVueling
17h 35mOPO-SFO
$299
9/17Tue
1 stopVueling
17h 35mOPO-SFO
$324
10/24Thu
2 stopsTAP AIR PORTUGAL
26h 50mOPO-SFO
$358
9/17Tue
2 stops
21h 00mOPO-SFO
$364
6/16Sun
1 stopTAP AIR PORTUGAL
23h 50mOPO-SFO
$549
6/14Fri
2 stopsAmerican Airlines
22h 19mOPO-SFO
$591
6/28Fri
2 stopsDelta
21h 38mOPO-SFO
$873
6/27Thu
2 stopsDelta
22h 03mOPO-SFO
$877
7/7Sun
2 stopsAmerican Airlines
20h 43mOPO-SFO
$948
9/19Thu
2 stopsLufthansa
17h 45mOPO-SFO
$2,529

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Last minute flights from Porto to San Francisco

Last minute flight, train and bus deals

 
These last-minute flight deals are the cheapest flights found on KAYAK in the last 72 hours for flights from Porto to San Francisco that are departing in the next 10 days.
5/10Fri
multi-stop
20h 53mOPO-SFO
5/28Tue
multi-stop
13h 50mSFO-OPO
$810
5/13Mon
multi-stopIberia
27h 45mOPO-SFO
5/28Tue
multi-stopIberia
17h 35mSFO-OPO
$832
5/13Mon
multi-stopUnited Airlines
16h 53mOPO-SFO
5/26Sun
multi-stopUnited Airlines
15h 55mSFO-OPO
$839
5/9Thu
multi-stopAir Canada
20h 22mOPO-SFO
5/24Fri
multi-stopAir Canada
19h 55mSFO-OPO
$846
5/9Thu
multi-stopAir Canada
20h 22mOPO-SFO
5/25Sat
multi-stopAir Canada
19h 55mSFO-OPO
$848
5/9Thu
multi-stop
21h 52mOPO-SFO
5/26Sun
multi-stop
19h 40mSFO-OPO
$849
5/9Thu
multi-stopAir Canada
20h 22mOPO-SFO
5/23Thu
multi-stopAir Canada
19h 55mSFO-OPO
$880
5/11Sat
multi-stopAmerican Airlines
20h 44mOPO-SFO
5/30Thu
multi-stopAmerican Airlines
17h 32mSFO-OPO
$887
5/12Sun
multi-stopAmerican Airlines
20h 46mOPO-SFO
5/26Sun
multi-stopAmerican Airlines
17h 32mSFO-OPO
$941
5/11Sat
multi-stopDelta
14h 45mOPO-SFO
5/30Thu
multi-stopDelta
24h 20mSFO-OPO
$1,092

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Porto - San Francisco Flights

Departure:

Porto (undefined)Portugal

Destination:

San Francisco (SFO)United States

Return flight deals:

San Francisco - Porto

Cabin classes: