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 23 days before departure.

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

With an average price of $815 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 $561 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 $449 for a return flight and $310 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 Tuesday, when prices are around $406. The most expensive day is generally Thursday, where the average price is around $525.

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 August, where plane tickets cost $468 on average. If possible, try to avoid the most expensive months of June and September, where tickets cost $696 and $706 respectively.

$404 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, Apr 25 - Tue, May 5

4:55 pm - 10:30 am

SFO

LIS

33h 35m

1 stop

11:25 am - 11:25 am

LIS

SFO

32h 00m

1 stop

$513United Airlines

Sun, Apr 19 - Thu, Apr 30

11:55 pm - 9:20 am

SFO

LIS

25h 25m

2 stops

12:20 pm - 9:49 pm

LIS

SFO

17h 29m

1 stop

$515United Airlines

Sun, Mar 8 - Wed, Mar 18

8:52 pm - 10:15 am

SFO

LIS

30h 23m

2 stops

11:55 am - 7:23 am

LIS

SFO

26h 28m

2 stops

$516United Airlines

Sun, Apr 19 - Thu, Apr 30

11:55 pm - 9:20 am

SFO

LIS

25h 25m

2 stops

10:25 am - 1:16 am

LIS

SFO

22h 51m

2 stops

$520United Airlines

Sat, Apr 25 - Tue, May 5

4:55 pm - 10:30 am

SFO

LIS

33h 35m

1 stop

1:00 pm - 11:24 am

LIS

SFO

30h 24m

2 stops

$522United Airlines

Tue, Aug 18 - Tue, Sep 1

11:10 am - 9:20 am

SFO

LIS

14h 10m

1 stop

11:25 am - 9:05 pm

LIS

SFO

41h 40m

2 stops

$561United Airlines

Sat, Aug 15 - Wed, Sep 2

10:55 pm - 10:30 am

SFO

LIS

27h 35m

1 stop

11:25 am - 11:21 am

LIS

SFO

31h 56m

1 stop

$563United Airlines

Mon, Aug 17 - Tue, Sep 1

12:50 am - 9:20 am

SFO

LIS

24h 30m

2 stops

11:25 am - 7:05 pm

LIS

SFO

39h 40m

2 stops

$565United Airlines

Mon, Aug 17 - Fri, Sep 4

6:00 am - 9:20 am

SFO

LIS

19h 20m

2 stops

11:25 am - 11:21 am

LIS

SFO

31h 56m

1 stop

$578United Airlines

Sat, Aug 8 - Thu, Aug 20

9:30 pm - 10:30 am

SFO

LIS

29h 00m

1 stop

11:25 am - 10:58 pm

LIS

SFO

19h 33m

2 stops

$591United Airlines

Useful Info

Low season	January
High season	December
Cheapest flight	$404
Average price round-trip	$627

Best time to beat the crowds with an average 12% drop in price.

Most popular time to fly with an average 11% 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 23 days before departure.
Is United Airlines the cheapest airline to fly with from San Francisco to Lisbon?
With an average price of $815 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 $561 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 $449 for a return flight and $310 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 Tuesday, when prices are around $406. The most expensive day is generally Thursday, where the average price is around $525.
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 August, where plane tickets cost $468 on average. If possible, try to avoid the most expensive months of June and September, where tickets cost $696 and $706 respectively.

7.4

Good9,345 verified ratings

8.1Crew

7.1Entertainment

7.3Comfort

6.6Food

7.7Boarding

8.0 Very good

Mike, Feb 2026

PSP

DEN

Good

8.0 Very good

Verified traveler, Feb 2026

YEG

IAH

Given I (and I’m assuming most people) have both carry in and a personal item included in their fare, I find it very unfair that on neither of my flights I was able to use the overhead for my small backpack because they were completely rammed with luggage, people personal items, jackets, hats and other items. So the only item I brought in had to be stuffed under my seat while they had their leg room and sat comfortable with all of their items in the overhead. This has to stop because I was uncomfortable on both flights when I only had one smaller item that could not be checked due to its contents (medication etc). Plenty of people could have checked theirs but chose not to and then took up the space allotment for 2 people.

8.0 Very good

Verified traveler, Feb 2026

SFO

ICN

Great

10.0 Wonderful

Verified traveler, Feb 2026

DEN

RSW

Flight left on time and we arrived 25 minutes early! There was a gate available when we arrived so early on a busy Sunday afternoon! Flight attendants came around twice with the drinks cart.

10.0 Wonderful

Dr. Joseph, Feb 2026

DCA

ORD

Wonderful. Quick boarding. Early departure and we arrived 30 minutes early at our destination. Unfortunately, when you arrive early, there is still a departing aircraft at our gate. We had to park for 30 minutes until the gate was clear. So our early arrival was not really early at the gate. Otherwise it was a quick and smooth flight. Appreciated the efficiency.

2.0 Poor

Verified traveler, Feb 2026

ONT

SFO

wifi didn't work the entire way

10.0 Wonderful

Julian, Feb 2026

EWR

CDG

Flight on time. Excellent service in Premium Economy. Great food served and cleaned up promptly. Unfortunately the climate control was malfunctioning and it was very cold and felt a bit like camping. Cold helps with sleep though so not complaining too much. Slept well. It asks to rate "entertainment". I do not like any IFE, don't shove a big screen in my face—I have my own phone if I want it. So this will always get low ratings.

8.0 Very good

Verified traveler, Feb 2026

SFO

HKG

We had turbulence ever 1/2 hr or so and the captains announcements were SOOOO LOUD

2.0 Poor

Payton, Feb 2026

ZRH

MIA

I couldn’t make my first flight due to weather delays trapping us in the town we were in. Then I had to buy a new ticket

6.0 Okay

yun bin, Feb 2026

YYZ

SFO

Flight attendants had a little attitude. Food tastes no good.

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

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SFO - LIS

$404 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 23 days before departure.

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

With an average price of $815 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 $561 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 $449 for a return flight and $310 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 Tuesday, when prices are around $406. The most expensive day is generally Thursday, where the average price is around $525.

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 August, where plane tickets cost $468 on average. If possible, try to avoid the most expensive months of June and September, where tickets cost $696 and $706 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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Cabin classes available on flights to San Francisco. Prices are the lowest found on KAYAK over the last 7 days. Price and availability is not guaranteed.

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