How far in advance should I book tickets for a flight with United Airlines from San Francisco to Lisbon?

Generally, when trying to get a below average price for your ticket, try to book around 1 days before departure. For the cheapest possible price, our data suggests booking 22 days before departure.

Is United Airlines the cheapest airline to fly with from San Francisco to Lisbon?

With an average price of $821 return, United Airlines is not the cheapest airline to fly from San Francisco to Lisbon with. Instead, for the lowest price, our data suggests flying with Scandinavian Airlines, where a return flight costs $569 on average.

What is the cheapest United Airlines flight from San Francisco to Lisbon?

In the last 3 days, the lowest price for a flight with United Airlines from San Francisco to Lisbon was $536 for a return flight and $363 for a one-way flight.

Does United Airlines fly direct to Lisbon from San Francisco?

No, United Airlines does not fly the route directly.

What’s the cheapest day of the week to fly from San Francisco to Lisbon with United Airlines?

On average, the cheapest day of the week to fly from San Francisco to Lisbon with United Airlines is Sunday, when prices are around $388. The most expensive day is generally Thursday, where the average price is around $504.

What’s the cheapest month to fly from San Francisco to Lisbon with United Airlines?

The cheapest month for United Airlines flights to Lisbon from San Francisco is generally February, where plane tickets cost $455 on average. If possible, try to avoid the most expensive months of April and September, where tickets cost $617 and $773 respectively.

$517 Cheap United Airlines Flights from San Francisco to Lisbon

SFO - LIS

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Cheap United Airlines Flight Deals from San Francisco to Lisbon

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

Round-trip

One-way

Last minute

Recent round-trip United Airlines flight deals from San Francisco to Lisbon

Sat, Oct 17 - Fri, Oct 30

9:30 pm - 10:30 am

SFO

LIS

29h 00m

1 stop

11:20 am - 9:22 pm

LIS

SFO

17h 02m

1 stop

$771United Airlines

Sat, Oct 17 - Fri, Oct 30

10:55 pm - 10:30 am

SFO

LIS

27h 35m

1 stop

11:20 am - 7:05 am

LIS

SFO

26h 45m

2 stops

$776United Airlines

Wed, Aug 12 - Wed, Sep 23

8:10 am - 9:20 am

SFO

LIS

17h 10m

1 stop

11:25 am - 8:49 pm

LIS

SFO

41h 24m

2 stops

$781United Airlines

Sat, Aug 8 - Thu, Aug 20

11:05 pm - 10:30 am

SFO

LIS

27h 25m

1 stop

11:25 am - 11:21 am

LIS

SFO

31h 56m

1 stop

$783United Airlines

Wed, Aug 12 - Wed, Sep 23

7:00 am - 9:20 am

SFO

LIS

18h 20m

2 stops

11:25 am - 8:30 pm

LIS

SFO

41h 05m

2 stops

$785United Airlines

Wed, Aug 12 - Wed, Aug 19

11:10 am - 9:20 am

SFO

LIS

14h 10m

1 stop

11:25 am - 11:21 am

LIS

SFO

31h 56m

1 stop

$794United Airlines

Sat, Aug 8 - Thu, Aug 20

11:05 pm - 10:30 am

SFO

LIS

27h 25m

1 stop

11:25 am - 11:21 am

LIS

SFO

31h 56m

1 stop

$800United Airlines

Wed, Aug 12 - Wed, Sep 23

11:10 am - 9:20 am

SFO

LIS

14h 10m

1 stop

12:20 pm - 8:30 pm

LIS

SFO

16h 10m

1 stop

$801United Airlines

Sun, Aug 2 - Wed, Aug 19

11:47 pm - 9:20 am

SFO

LIS

25h 33m

1 stop

12:20 pm - 12:20 am

LIS

SFO

20h 00m

2 stops

$805United Airlines

Sat, Sep 19 - Fri, Oct 2

4:30 pm - 11:05 am

SFO

LIS

34h 35m

1 stop

12:20 pm - 1:16 am

LIS

SFO

20h 56m

1 stop

$806United Airlines

Useful Info

Low season	January
High season	December
Cheapest flight	$517
Average price round-trip	$778

Best time to beat the crowds with an average 9% drop in price.

Most popular time to fly with an average 10% increase in price.

Flight from San Francisco to Lisbon

(price for this month)

When to Book Flights with United Airlines from San Francisco to Lisbon

Average price per month

Flight prices as travel date approaches

How far in advance should I book tickets for a flight with United Airlines from San Francisco to Lisbon?
Generally, when trying to get a below average price for your ticket, try to book around 1 days before departure. For the cheapest possible price, our data suggests booking 22 days before departure.
Is United Airlines the cheapest airline to fly with from San Francisco to Lisbon?
With an average price of $821 return, United Airlines is not the cheapest airline to fly from San Francisco to Lisbon with. Instead, for the lowest price, our data suggests flying with Scandinavian Airlines, where a return flight costs $569 on average.
What is the cheapest United Airlines flight from San Francisco to Lisbon?
In the last 3 days, the lowest price for a flight with United Airlines from San Francisco to Lisbon was $536 for a return flight and $363 for a one-way flight.
Does United Airlines fly direct to Lisbon from San Francisco?
No, United Airlines does not fly the route directly.
What’s the cheapest day of the week to fly from San Francisco to Lisbon with United Airlines?
On average, the cheapest day of the week to fly from San Francisco to Lisbon with United Airlines is Sunday, when prices are around $388. The most expensive day is generally Thursday, where the average price is around $504.
What’s the cheapest month to fly from San Francisco to Lisbon with United Airlines?
The cheapest month for United Airlines flights to Lisbon from San Francisco is generally February, where plane tickets cost $455 on average. If possible, try to avoid the most expensive months of April and September, where tickets cost $617 and $773 respectively.

7.4

Good9,613 verified ratings

7.3Comfort

7.1Entertainment

6.6Food

7.7Boarding

8.1Crew

8.0 Very good

Verified traveler, Apr 2026

MCO

IAH

Smooth and easy process

10.0 Wonderful

Verified traveler, Apr 2026

SRQ

ORD

Thank you!

10.0 Wonderful

Sedi, Apr 2026

IAD

STT

It was bumpy but overall a good flight.

2.0 Poor

Dr. Joseph, Apr 2026

CLT

ORD

The flight was significantly delayed. The inbound flight from EWR was delayed departing because of mechanical problems. My original departure from CLT was 5:28 pm but due to the delay of the inbound flight, after arrival, deplaning, cleaning, boarding, we did not push back from the gate until 9:00 pm. Once in the air, the flight was smooth and what was originally supposed to be an arrival in ORD at 7:30 pm local time turned out to be 9:35 pm.

10.0 Wonderful

Verified traveler, Apr 2026

LHR

IAD

Everytings very good thank you

10.0 Wonderful

Verified traveler, Apr 2026

SFO

LAX

Seamless.

8.0 Very good

Ken, Apr 2026

DEN

YQR

Putting people that close to the bathroom, where you have to look into the bathroom as people are exiting and entering was not great and the smell was also not great. I know the airlines are desperate for more chairs, but that seat is a crime.

8.0 Very good

Ken, Apr 2026

PVR

DEN

The rear seat on the second leg should be illegal. There’s no way you should make somebody sit that close to the washroom. Very awkward.

2.0 Poor

Verified traveler, Apr 2026

IST

FRA

They cancelled my flight and rebooked for Monday from Saturday without my consent. Putting me in a stressful spot. I have important medical appointments that I can’t miss and work. I tried to contact them to either rebook or request a refund, but I was always 200 or more in line and could never get ahold of customer service the call would always hang up after waiting 2 hours on hold. I’m not sure if I will ever get a refund even though I paid for seats as well, but my only option was to spend more money to rebook with another airline.

10.0 Wonderful

Denise and Scott, Apr 2026

MUC

IAD

Terrific in every way. On time, professional staff, multiple movie options to select, great food and drink.

Everything you need to know for your flight from San Francisco to Lisbon

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SFO - LIS

$517 Find Cheap United Airlines Flights from San Francisco to Lisbon

Search hundreds of travel sites at once for deals on United Airlines flights from San Francisco to Lisbon

Cheap United Airlines Flight Deals from San Francisco to Lisbon

Recent round-trip United Airlines flight deals from San Francisco to Lisbon

Recent one-way United Airlines flight deals from San Francisco to Lisbon

Recent last minute United Airlines flight deals from San Francisco to Lisbon

Good to know

When to Book Flights with United Airlines from San Francisco to Lisbon

FAQs for flying to Lisbon with United Airlines

How far in advance should I book tickets for a flight with United Airlines from San Francisco to Lisbon?

Generally, when trying to get a below average price for your ticket, try to book around 1 days before departure. For the cheapest possible price, our data suggests booking 22 days before departure.

Is United Airlines the cheapest airline to fly with from San Francisco to Lisbon?

With an average price of $821 return, United Airlines is not the cheapest airline to fly from San Francisco to Lisbon with. Instead, for the lowest price, our data suggests flying with Scandinavian Airlines, where a return flight costs $569 on average.

What is the cheapest United Airlines flight from San Francisco to Lisbon?

In the last 3 days, the lowest price for a flight with United Airlines from San Francisco to Lisbon was $536 for a return flight and $363 for a one-way flight.

Does United Airlines fly direct to Lisbon from San Francisco?

No, United Airlines does not fly the route directly.

What’s the cheapest day of the week to fly from San Francisco to Lisbon with United Airlines?

On average, the cheapest day of the week to fly from San Francisco to Lisbon with United Airlines is Sunday, when prices are around $388. The most expensive day is generally Thursday, where the average price is around $504.

What’s the cheapest month to fly from San Francisco to Lisbon with United Airlines?

The cheapest month for United Airlines flights to Lisbon from San Francisco is generally February, where plane tickets cost $455 on average. If possible, try to avoid the most expensive months of April and September, where tickets cost $617 and $773 respectively.

United Airlines Customer Reviews

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Everything you need to know for your flight from San Francisco to Lisbon

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