United flights to San Francisco

The best United flight deals to San Francisco

Looking for a cheap last-minute deal or the best return flight to San Francisco? If you want to travel to San Francisco next month, return fares with United start from 728 €. Find the lowest prices on one-way and return tickets right here.

San Francisco.725 € per passenger.Departing Thu, 26 Nov, returning Wed, 9 Dec.Return flight with United.Outbound indirect flight with United, departs from Porto on Thu, 26 Nov, arriving in San Francisco International.Inbound indirect flight with United, departs from San Francisco International on Wed, 9 Dec, arriving in Porto.Price includes taxes and charges.From 725 €, select.

San Francisco.725 € per passenger.Departing Wed, 2 Dec, returning Wed, 9 Dec.Return flight with United.Outbound indirect flight with United, departs from Porto on Wed, 2 Dec, arriving in San Francisco International.Inbound indirect flight with United, departs from San Francisco International on Wed, 9 Dec, arriving in Porto.Price includes taxes and charges.From 725 €, select.

San Francisco.728 € per passenger.Departing Thu, 17 Sep, returning Tue, 22 Sep.Return flight with United.Outbound indirect flight with United, departs from Porto on Thu, 17 Sep, arriving in San Francisco International.Inbound indirect flight with United, departs from San Francisco International on Tue, 22 Sep, arriving in Porto.Price includes taxes and charges.From 728 €, select.

San Francisco.728 € per passenger.Departing Thu, 24 Sep, returning Mon, 5 Oct.Return flight with United.Outbound indirect flight with United, departs from Porto on Thu, 24 Sep, arriving in San Francisco International.Inbound indirect flight with United, departs from San Francisco International on Mon, 5 Oct, arriving in Porto.Price includes taxes and charges.From 728 €, select.

San Francisco.728 € per passenger.Departing Fri, 5 Jun, returning Sat, 20 Jun.Return flight with United.Outbound indirect flight with United, departs from Porto on Fri, 5 Jun, arriving in San Francisco International.Inbound indirect flight with United, departs from San Francisco International on Sat, 20 Jun, arriving in Porto.Price includes taxes and charges.From 728 €, select.

San Francisco.731 € per passenger.Departing Thu, 14 Jan, returning Mon, 18 Jan.Return flight with United.Outbound indirect flight with United, departs from Porto on Thu, 14 Jan, arriving in San Francisco International.Inbound indirect flight with United, departs from San Francisco International on Mon, 18 Jan, arriving in Porto.Price includes taxes and charges.From 731 €, select.

San Francisco.732 € per passenger.Departing Thu, 27 Aug, returning Mon, 14 Sep.Return flight with United.Outbound indirect flight with United, departs from Lisbon on Thu, 27 Aug, arriving in San Francisco International.Inbound indirect flight with United, departs from San Francisco International on Mon, 14 Sep, arriving in Lisbon.Price includes taxes and charges.From 732 €, select.

San Francisco.732 € per passenger.Departing Thu, 8 Oct, returning Sun, 8 Nov.Return flight with United.Outbound indirect flight with United, departs from Lisbon on Thu, 8 Oct, arriving in San Francisco International.Inbound indirect flight with United, departs from San Francisco International on Sun, 8 Nov, arriving in Lisbon.Price includes taxes and charges.From 732 €, select.

San Francisco.733 € per passenger.Departing Sun, 14 Feb, returning Sat, 20 Feb.Return flight with United.Outbound indirect flight with United, departs from Lisbon on Sun, 14 Feb, arriving in San Francisco International.Inbound indirect flight with United, departs from San Francisco International on Sat, 20 Feb, arriving in Lisbon.Price includes taxes and charges.From 733 €, select.

San Francisco.733 € per passenger.Departing Thu, 5 Nov, returning Sun, 8 Nov.Return flight with United.Outbound indirect flight with United, departs from Lisbon on Thu, 5 Nov, arriving in San Francisco International.Inbound indirect flight with United, departs from San Francisco International on Sun, 8 Nov, arriving in Lisbon.Price includes taxes and charges.From 733 €, select.

San Francisco.733 € per passenger.Departing Mon, 8 Mar, returning Mon, 15 Mar.Return flight with United.Outbound indirect flight with United, departs from Lisbon on Mon, 8 Mar, arriving in San Francisco International.Inbound indirect flight with United, departs from San Francisco International on Mon, 15 Mar, arriving in Lisbon.Price includes taxes and charges.From 733 €, select.

San Francisco.733 € per passenger.Departing Mon, 28 Dec, returning Mon, 11 Jan.Return flight with United.Outbound indirect flight with United, departs from Lisbon on Mon, 28 Dec, arriving in San Francisco International.Inbound indirect flight with United, departs from San Francisco International on Mon, 11 Jan, arriving in Lisbon.Price includes taxes and charges.From 733 €, select.

San Francisco.733 € per passenger.Departing Wed, 7 Oct, returning Tue, 13 Oct.Return flight with United.Outbound indirect flight with United, departs from Lisbon on Wed, 7 Oct, arriving in San Francisco International.Inbound indirect flight with United, departs from San Francisco International on Tue, 13 Oct, arriving in Lisbon.Price includes taxes and charges.From 733 €, select.

San Francisco.733 € per passenger.Departing Thu, 8 Apr, returning Thu, 15 Apr.Return flight with United.Outbound indirect flight with United, departs from Lisbon on Thu, 8 Apr, arriving in San Francisco International.Inbound indirect flight with United, departs from San Francisco International on Thu, 15 Apr, arriving in Lisbon.Price includes taxes and charges.From 733 €, select.

San Francisco.733 € per passenger.Departing Sat, 30 Jan, returning Fri, 5 Feb.Return flight with United.Outbound indirect flight with United, departs from Lisbon on Sat, 30 Jan, arriving in San Francisco International.Inbound indirect flight with United, departs from San Francisco International on Fri, 5 Feb, arriving in Lisbon.Price includes taxes and charges.From 733 €, select.

San Francisco.735 € per passenger.Departing Thu, 18 Feb, returning Mon, 1 Mar.Return flight with United.Outbound indirect flight with United, departs from Lisbon on Thu, 18 Feb, arriving in San Francisco International.Inbound indirect flight with United, departs from San Francisco International on Mon, 1 Mar, arriving in Lisbon.Price includes taxes and charges.From 735 €, select.

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Find the cheapest time to fly to San Francisco with United

Flexible on travel dates? Here's when fares are lowest.

May

Jun

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Aug

Sep

Oct

Nov

Dec

Jan

Feb

Mar

Apr

Find which San Francisco airports United flies to

Compare routes to San Francisco below. You may find an airport to fly into that's cheaper, faster, or easier.

Flying to San Francisco with United

The things to know before you go.

Cheapest flight found	725 €
Cheapest month to fly	September

How to find cheap flights to San Francisco with United

Looking for cheap flight tickets to San Francisco? Here are a few tips on how to find the best price.

Simply hit 'search'

We've compared every online travel agent and flight provider out there to find the cheapest United flight tickets to San Francisco. And with us, there are no added fees – what you see is what you pay.

Fly from Porto

At the moment, the best route to San Francisco with United is from Porto to San Francisco.

Fly in December

The cheapest time to go to San Francisco with United is currently December.

Flex your dates for the best rates

If you're flexible on your departure dates, use Skyscanner's whole month tool to find the cheapest month, and even day to get flights to San Francisco with United.

Set up a Price Alert

We'll let you know when the price of your flight to San Francisco goes up or down so you can book when the time is just right. You're even able to watch specific United flights.

Book your United flight to San Francisco with extra peace of mind

Find flexible United flights to San Francisco

United might offer amendable tickets to San Francisco, which means you won't lose out if your booking has to be changed or cancelled.

Add travel cost protection

Make sure you have the right travel insurance before flying to San Francisco. That way you can cover the costs of any unexpected events, such as delays or lost luggage.

Reduce your carbon footprint

To check whether there are any lower emissions flights available on your route, simply check the “only show flights with lower CO₂ emissions” box when you search for a flight with us.

Flying to San Francisco with United: FAQs

How long is the flight to San Francisco with United?

The average United flight time from Portugal to San Francisco is 12 hours and 42 minutes.

Which other airlines can I fly to San Francisco with?

At the moment, TAP Air Portugal, jetBlue, Etihad Airways and Azores Airlines all fly to San Francisco too.

Is there anywhere else I could fly to with United?

United currently also flies to Chicago O'Hare International, Houston George Bush Intercntl. and San Francisco International.

What's the cheapest month to fly to San Francisco with United?

Although it's difficult to get an accurate idea of when United flights to San Francisco are cheapest, the lowest fares are currently for departures in December.