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

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Good to Know

Average Price:
$1518
(avg. price over the last 2 weeks)
Good Deal:
$1033
or less (round trip)

When to Book Flights from San Francisco to Porto

Flight prices as travel date approaches
-1 day
-2 days

Top tips for Finding a Cheap Flight

Looking for a cheap flight? 25% of our users found flights on this route for $1032 or less.
The cheapest flight from San Francisco to Porto was found 35 days before departure, on average.
Book at least 3 weeks before departure in order to get a below-average price.
Morning departure is around 14% more expensive than an evening flight, on average*.
*Average of the lowest prices shown in KAYAK’s search results for departures within the next 30 days

FAQs for Booking San Francisco to Porto Flights

How long does a flight from San Francisco to Porto take?
An average nonstop flight takes 16h 50m, covering a distance of 5574 miles.
Which airlines provide the cheapest flights from San Francisco to Porto?
In the past 3 days, the cheapest round-trip tickets were found on Multiple Airlines ($627), Turkish Airlines ($858) and TAP AIR PORTUGAL ($890).
Do I need a passport to fly between San Francisco and Porto?
Yes.

Book cheap flights from San Francisco to Porto (round-trip)

Airports
Origin
San Francisco
$627
only
$627
Destination
Porto
$627
only
$627
Mon, Jan 22
SFO
OPO
24h 55m
Fri, Jan 26
OPO
SFO
26h 33m
Trip: 5 days
Overall 0.0 Poor
Based on 0 reviews
Fri, Mar 16
SFO
OPO
33h 10m
Thu, Mar 22
OPO
SFO
36h 15m
Trip: 7 days
8.0ExcellentShow reviews
Overall 8.0 Excellent
Based on 16958 reviews
Overall
8.0
Boarding
7.9
Comfort
7.8
Crew
8.3
Entertainment
8.1
Food
8.0
MNL
IST
Okay 5.3

Flight was ok

The flight was actually run by turkish airlines, not philippine air as stated in my confirmation email, so we were sent to the wrong terminal. Nothing in the email said which terminal the flight would depart from or that it was actually turkish airlines. Very irresponsible and communication for customers should be much clearer. Luckily we were very early for the flight or it could have caused a serious problem.

JFK
IST
Excellent 9.0

The amazing entertainment system.

The smell of feet, and nausea from turbulence after food (not really Turkish's fault). Also, I'm getting too used to the food by now, and it doesn't seem to change much.

EDI
IST
Good 6.3

Crew

Boarding status changed straight from pre boarding to last call. No AC

IST
TLV
Good 6.0

No AC

IST
SFO
Excellent 10.0

One of my fave airlines now Great seats, services, staff Turkish coffee in the air!

they keep the cabin a bit too hot, need to ask them all the time to make it colder

Mon, Apr 30
SFO
OPO
18h 01m
Thu, May 31
OPO
SFO
29h 08m
Trip: 32 days
7.4GoodShow reviews
Overall 7.4 Good
Based on 2951 reviews
Overall
7.6
Boarding
7.5
Comfort
7.4
Crew
8.0
Entertainment
6.8
Food
7.2
LIS
MXP
Mediocre 2.0

I had 1 jour layover but was a big lide for air line I would never travel with this air line again the rest my life They have me pay my luggage. That is stealing from customers Butshit

LIS
MIA
Good 7.0

The food was good. I have Celiac Disease and they accommodated my gluten free necessities with GF bread!! Wow.

The entertainment for an international flight (9 hours) was horrendous. The tiny TVs were actually fuzzy and it is set up so that you cannot actually choose your movie. It is like watching TV where you may tune in to a movie 20 minutes into it playing instead of starting whatever movie you want from the beginning. To make matters worse, there was no plug-in in case you wanted to watch entertainment of your own on phone/iPad.

LPA
LIS
Mediocre 2.0

Boarding was refused at gate due to late arrival of previous flight which was also a TAP flight. No assistance to delay following flight or accelerate our deplaning even though the next identical flight was three days later.

LIS
MIA
Excellent 8.0

Shorter time over Atlantic. Very gentle staff. Good food and service. And I will visit Lisbon next time

Boarding from a bus at the main TAP airport for so many travellers and a long trip. Hei! Is not an economy charter!

DKR
LIS
Mediocre 2.0

Not good I book a fly

Wed, Jan 10
SFO
OPO
36h 00m
Wed, Jan 17
OPO
SFO
33h 05m
$1112
Trip: 8 days
7.8GoodShow reviews
Overall 7.8 Good
Based on 1540 reviews
Overall
8.0
Boarding
8.0
Comfort
7.7
Crew
8.5
Entertainment
7.2
Food
7.5
AMS
ATL
Good 7.0

newer plane, good staff

need better and more food options, more often

AMS
PRG
Excellent 10.0

Equally friendly crew and experience. It was complimented by the time we got to spend in the fantastic KLM lounge while we waited for the flight.

Nothing!

ATL
CLE
Okay 4.6

old plane, tight and uncomfortable

KRK
AMS
Mediocre 3.0

Flight way delayed 3 hours. Staff gave no information and wouldn't help rebook us onto other flights. They gave us food vouchers 2 minutes before we finally boarded, so we couldn't use them. The food on the plane had spoiled so we were all starving on the flight, and we all missed our connections. Horrible experience and wouldn't fly with KLM again.

JNB
AMS
Excellent 8.0

Good multi media access and content

Fri, Feb 9
SFO
OPO
28h 40m
Mon, Feb 19
OPO
SFO
70h 45m
Trip: 11 days
Overall 0.0 Poor
Based on 0 reviews
Tue, Jan 9
SFO
OPO
52h 00m
Mon, Jan 15
OPO
SFO
58h 01m
Trip: 7 days
Overall 0.0 Poor
Based on 0 reviews
Thu, Jan 11
SFO
OPO
27h 00m
Tue, Jan 30
OPO
SFO
28h 30m
Trip: 20 days
Overall 0.0 Poor
Based on 0 reviews
Wed, May 2
SFO
OPO
24h 05m
Thu, May 31
OPO
SFO
28h 08m
Trip: 30 days
7.4GoodShow reviews
Overall 7.4 Good
Based on 2951 reviews
Overall
7.6
Boarding
7.5
Comfort
7.4
Crew
8.0
Entertainment
6.8
Food
7.2
LIS
EWR
Good 6.3

Friendly and kind captain and crew

I was very very sick, so after the 3 hours delay I asked to stay in Lisbon and be sending next day to continue my journey home ... Surprisingly TAP told me that they could pay the hotel in Newark, but not in Lisbon.. Go figure! Called TAP Customer Service 4 times, 2 from Lisbon 2 from Newark... all cases more than 1 hour wait... AND THEY NEVER EVER ANSWERED!?!?!

LIS
LHR
Good 6.8

The crew did a great job.

The boarding process was nutz. We had to take a bus away from the terminal to board the plane. The flight was delayed. I was not very happy to have to spend $92 to check 2 bags.

JFK
LIS
Mediocre 2.0

Cancelled our flight, at 4am. Did not give a reasonX

MXP
LIS
Excellent 8.0

Very gentle staff. Good food and service. And I will visit Lisbon next time.

Too early in the morning. A better connection in Lis wil lhelp

DSS
LIS
Okay 5.3

Nice crew, on time departure

Old plane, bad food

Thu, May 10
SFO
OPO
36h 20m
Thu, May 17
OPO
SFO
33h 05m
Trip: 8 days
8.0ExcellentShow reviews
Overall 8.0 Excellent
Based on 16958 reviews
Overall
8.0
Boarding
7.9
Comfort
7.8
Crew
8.3
Entertainment
8.1
Food
8.0
IST
SFO
Excellent 10.0

One of my fave airlines now Great seats, services, staff Turkish coffee in the air!

they keep the cabin a bit too hot, need to ask them all the time to make it colder

JFK
IST
Excellent 9.0

The amazing entertainment system.

The smell of feet, and nausea from turbulence after food (not really Turkish's fault). Also, I'm getting too used to the food by now, and it doesn't seem to change much.

JNB
IST
Excellent 10.0

I'm 6 ft 2. Legspace was adequate, and no silly boxes under the seats like other airlines that obstruct your feet. Great entertainment systems - modern, good selection. Food and staff excellent.

Their online checkin systems could operate a bit more smoothly. At one point, I had to go in in person, because the online checkin site had an already past flight from their codeshare partner SAS showing up as the next flight, and I couldn't perform online checkin as a result.

IST
TLV
Excellent 9.6

Entertainment, and the plane which felt really new and comfy.

Food was a bit boring (because it was such a short flight, I suppose)

IST
TLV
Good 6.0

No AC

Sun, Mar 18
SFO
OPO
28h 10m
Sun, Mar 25
OPO
SFO
70h 55m
Trip: 8 days
Overall 0.0 Poor
Based on 0 reviews
Thu, May 3
SFO
OPO
16h 50m
Thu, May 31
OPO
SFO
28h 08m
Trip: 29 days
7.4GoodShow reviews
Overall 7.4 Good
Based on 2951 reviews
Overall
7.6
Boarding
7.5
Comfort
7.4
Crew
8.0
Entertainment
6.8
Food
7.2
DSS
LIS
Okay 5.3

Nice crew, on time departure

Old plane, bad food

LIS
EWR
Good 6.3

Friendly and kind captain and crew

I was very very sick, so after the 3 hours delay I asked to stay in Lisbon and be sending next day to continue my journey home ... Surprisingly TAP told me that they could pay the hotel in Newark, but not in Lisbon.. Go figure! Called TAP Customer Service 4 times, 2 from Lisbon 2 from Newark... all cases more than 1 hour wait... AND THEY NEVER EVER ANSWERED!?!?!

LIS
MXP
Mediocre 2.0

I had 1 jour layover but was a big lide for air line I would never travel with this air line again the rest my life They have me pay my luggage. That is stealing from customers Butshit

LIS
LHR
Good 6.8

The crew did a great job.

The boarding process was nutz. We had to take a bus away from the terminal to board the plane. The flight was delayed. I was not very happy to have to spend $92 to check 2 bags.

LIS
MIA
Good 7.0

The food was good. I have Celiac Disease and they accommodated my gluten free necessities with GF bread!! Wow.

The entertainment for an international flight (9 hours) was horrendous. The tiny TVs were actually fuzzy and it is set up so that you cannot actually choose your movie. It is like watching TV where you may tune in to a movie 20 minutes into it playing instead of starting whatever movie you want from the beginning. To make matters worse, there was no plug-in in case you wanted to watch entertainment of your own on phone/iPad.

Tue, Feb 13
SFO
OPO
33h 10m
Thu, Feb 22
OPO
SFO
36h 15m
Trip: 10 days
8.0ExcellentShow reviews
Overall 8.0 Excellent
Based on 16958 reviews
Overall
8.0
Boarding
7.9
Comfort
7.8
Crew
8.3
Entertainment
8.1
Food
8.0
IST
SFO
Excellent 10.0

One of my fave airlines now Great seats, services, staff Turkish coffee in the air!

they keep the cabin a bit too hot, need to ask them all the time to make it colder

EDI
IST
Good 6.3

Crew

Boarding status changed straight from pre boarding to last call. No AC

IST
BUD
Excellent 10.0

Same

Same

YYZ
IST
Excellent 10.0

Luggage policy, helpful ground and air crew. Price.

IST stoppover, damaged luggages.

JFK
IST
Excellent 9.0

The amazing entertainment system.

The smell of feet, and nausea from turbulence after food (not really Turkish's fault). Also, I'm getting too used to the food by now, and it doesn't seem to change much.

Tue, Feb 13
SFO
OPO
26h 00m
Tue, Feb 27
OPO
SFO
28h 30m
Trip: 15 days
Overall 0.0 Poor
Based on 0 reviews
Wed, Feb 14
SFO
OPO
36h 00m
Thu, Feb 22
OPO
SFO
36h 15m
Trip: 9 days
8.0ExcellentShow reviews
Overall 8.0 Excellent
Based on 16958 reviews
Overall
8.0
Boarding
7.9
Comfort
7.8
Crew
8.3
Entertainment
8.1
Food
8.0
IST
SFO
Excellent 10.0

One of my fave airlines now Great seats, services, staff Turkish coffee in the air!

they keep the cabin a bit too hot, need to ask them all the time to make it colder

IST
LOS
Mediocre 2.0

To be honest nothing really.

Quality of service and quality of plane. Seems most of the flight attendants could care less about the flight passengers.

YYZ
IST
Excellent 10.0

Luggage policy, helpful ground and air crew. Price.

IST stoppover, damaged luggages.

JFK
IST
Excellent 9.0

The amazing entertainment system.

The smell of feet, and nausea from turbulence after food (not really Turkish's fault). Also, I'm getting too used to the food by now, and it doesn't seem to change much.

IST
KTM
Mediocre 2.0

I did not like anything.

Everything. I will never book a flight from Kayak from now on. Kayak just charged us a lot of money and did not do anything for us.

Mon, Feb 12
SFO
OPO
18h 20m
Thu, Feb 22
OPO
SFO
17h 20m
Trip: 11 days
7.4GoodShow reviews
Overall 7.4 Good
Based on 2951 reviews
Overall
7.6
Boarding
7.5
Comfort
7.4
Crew
8.0
Entertainment
6.8
Food
7.2
MXP
LIS
Excellent 8.0

Very gentle staff. Good food and service. And I will visit Lisbon next time.

Too early in the morning. A better connection in Lis wil lhelp

LIS
MXP
Mediocre 2.0

I had 1 jour layover but was a big lide for air line I would never travel with this air line again the rest my life They have me pay my luggage. That is stealing from customers Butshit

JFK
LIS
Mediocre 2.0

Cancelled our flight, at 4am. Did not give a reasonX

LIS
LHR
Good 6.8

The crew did a great job.

The boarding process was nutz. We had to take a bus away from the terminal to board the plane. The flight was delayed. I was not very happy to have to spend $92 to check 2 bags.

LIS
EWR
Excellent 10.0

was delayed 2 hours

Wed, May 9
SFO
OPO
32h 00m
Wed, May 16
OPO
SFO
32h 00m
Trip: 8 days
Overall 0.0 Poor
Based on 0 reviews
Thu, Feb 15
SFO
OPO
33h 10m
Thu, Feb 22
OPO
SFO
36h 15m
Trip: 8 days
8.0ExcellentShow reviews
Overall 8.0 Excellent
Based on 16958 reviews
Overall
8.0
Boarding
7.9
Comfort
7.8
Crew
8.3
Entertainment
8.1
Food
8.0
EDI
IST
Good 6.3

Crew

Boarding status changed straight from pre boarding to last call. No AC

IST
TLV
Excellent 9.6

Entertainment, and the plane which felt really new and comfy.

Food was a bit boring (because it was such a short flight, I suppose)

JFK
IST
Excellent 9.0

The amazing entertainment system.

The smell of feet, and nausea from turbulence after food (not really Turkish's fault). Also, I'm getting too used to the food by now, and it doesn't seem to change much.

IST
KTM
Mediocre 2.0

I did not like anything.

Everything. I will never book a flight from Kayak from now on. Kayak just charged us a lot of money and did not do anything for us.

IST
TLV
Good 6.0

No AC

Mon, Feb 12
SFO
OPO
18h 20m
Wed, Feb 21
OPO
SFO
20h 20m
Trip: 10 days
7.4GoodShow reviews
Overall 7.4 Good
Based on 2951 reviews
Overall
7.6
Boarding
7.5
Comfort
7.4
Crew
8.0
Entertainment
6.8
Food
7.2
LIS
MXP
Mediocre 2.0

I had 1 jour layover but was a big lide for air line I would never travel with this air line again the rest my life They have me pay my luggage. That is stealing from customers Butshit

AGP
LIS
Excellent 10.0

Efficiency and friendliness of staff with a visible commitment towards passengers on-board (customers). One of the best experience, even though the flight was too short, and even then the airlines served snacks and refreshments... Simply Amazing... A 5-STAR service to its customers... Wow

NONE

LPA
LIS
Mediocre 2.0

Boarding was refused at gate due to late arrival of previous flight which was also a TAP flight. No assistance to delay following flight or accelerate our deplaning even though the next identical flight was three days later.

DKR
LIS
Mediocre 2.0

Not good I book a fly

DSS
LIS
Okay 5.3

Nice crew, on time departure

Old plane, bad food

Wed, May 9
SFO
OPO
32h 00m
Thu, May 17
OPO
SFO
18h 35m
Trip: 9 days
Overall 0.0 Poor
Based on 0 reviews
Sun, Apr 29
SFO
OPO
33h 05m
Sun, Jun 3
OPO
SFO
33h 00m
Trip: 36 days
8.0ExcellentShow reviews
Overall 8.0 Excellent
Based on 16958 reviews
Overall
8.0
Boarding
7.9
Comfort
7.8
Crew
8.3
Entertainment
8.1
Food
8.0
YYZ
IST
Excellent 10.0

Luggage policy, helpful ground and air crew. Price.

IST stoppover, damaged luggages.

IST
LOS
Mediocre 2.0

To be honest nothing really.

Quality of service and quality of plane. Seems most of the flight attendants could care less about the flight passengers.

JNB
IST
Excellent 10.0

I'm 6 ft 2. Legspace was adequate, and no silly boxes under the seats like other airlines that obstruct your feet. Great entertainment systems - modern, good selection. Food and staff excellent.

Their online checkin systems could operate a bit more smoothly. At one point, I had to go in in person, because the online checkin site had an already past flight from their codeshare partner SAS showing up as the next flight, and I couldn't perform online checkin as a result.

JFK
IST
Excellent 9.0

The amazing entertainment system.

The smell of feet, and nausea from turbulence after food (not really Turkish's fault). Also, I'm getting too used to the food by now, and it doesn't seem to change much.

IST
KTM
Mediocre 2.0

I did not like anything.

Everything. I will never book a flight from Kayak from now on. Kayak just charged us a lot of money and did not do anything for us.

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The fares displayed include all taxes and fees for economy class travel and were found by the provider in the last 72 hours. Seats are limited and may not be available on all flights and days. Fares are subject to change and may not be available on all flights or dates of travel. Some carriers charge additional fees for extra checked bags. Please check the carriers' sites.