The cheapest times to fly from STN to SFO are

  • January 8th to March 25th (except the week of February 5th)
  • April 23rd to July 1st (except the week of April 30th)
  • September 3rd to October 21st

based on data collected exclusively by Champion Traveler across tens of millions of flights. Among all the dates above, the very cheapest time to fly from STN to SFO is early to mid October. Prices can be as high as $10572 for Wednesday flights during late December, or as low as $515 for Thursday flights around early to mid October.


When to Fly to San Francisco

Flying from London (STN) to San Francisco, CA (SFO) will usually cost between $515 to $1006 per person if booking more than four weeks in advance. On average the very cheapest time to fly is early to mid October with an average ticket price of $542. Due to high demand the most expensive time to fly is late December, with an average price of $3163. Planning your trip to low-cost times can easily save you $2621 on economy flights and even more on first-class flights. Generally, any price below $640 can be considered a good price for a round-trip STN to SFO flight.

See below for a graph of average weekly prices for the STN to SFO route. All prices are for round-trip tickets in USD.

STN to SFO Flight Prices

Compared to other flights, the STN to SFO flight is cheaper than the average and costs much less than the average flight leaving from London. The average price per mile (for a direct flight) is $0.07, which is far below average.


Flight Prices by Day of the Week

Thursday is usually the cheapest day to depart and return on this flight. Wednesdays are the most expensive days to fly to San Francisco, and Fridays are the most expensive days to return to London. Selecting flights on the least expensive days could save you up to $199 (23%) on this flight.

Departing prices are for round-trip flights returning on the day of departure. For example, a flight departing on Thursday and returning a week later will cost an average of $636. Return trip prices are from the SFO to STN flight, and often highlight the quality of our data in showing the same trend.

Departing Prices by Day

Departure Day Prices

Return Trip Prices by Day

Return Day Prices


Nonstop Flights and Layovers

Travelers looking to fly from STN to SFO can generally find a 1-layover flight. Because there is not usually a direct flight option the real-world direct flight time of 10 hour 37 minutes may not be realistic.


Flight Hacking STN to SFO

Flight hacking is when you book two tickets instead of a layover, sometimes with different airlines. You will need to either bring only a carry-on bag (highly recommended) or leave yourself plenty of time to go through security again. Flight hacking is completely allowed, but airlines don’t always tell you the cheapest way to get from STN to SFO — but Champion Traveler does!

Hack #1: Oslo (STN > OSL > SFO)

  • Price for both tickets: $467
  • Average savings: $173 (27.03%)

See STN to CPH flights

Hack #2: Copenhagen (STN > CPH > SFO)

  • Price for both tickets: $483
  • Average savings: $157 (24.53%)

See STN to OSL flights

Hack #3: Gothenburg (STN > GOT > SFO)

  • Price for both tickets: $501
  • Average savings: $139 (21.72%)

See STN to GOT flights


Flight Questions Answered

Still have questions about flying from STN to SFO? We’ve got answers.

Which airlines fly this route?

You can find 15 major airlines flying this route most often: Air Canada, Air France, American, Avianca, British Airways, Brussels Airlines, Delta, Eurowings, Iberia, KLM, Lufthansa, SAS, SWISS, United, Wideroe, and potentially more during busy seasons.

How far away is it from San Francisco International Airport to London Stansted Airport?

The distance between the two airports is roughly 5352 miles or 8613 kilometers.

How long does it take to fly from STN to SFO?

The real-world flight time for a nonstop STN to SFO flight is about 10 hour 37 minutes.

How many flights go between London and San Francisco, CA?

It depends on the day of the week and the date, but a typical day might have around 43 available flights from STN to SFO.


Airport Location Info


Departing Airport

Origination code STN
Origination airport name London Stansted Airport
City London
Country the United Kingdom
Latitude 51.9
Longitude 0.2

Return Airport

Destination code SFO
Destination airport name San Francisco International Airport
City San Francisco, CA
Country the United States
Latitude 37.6
Longitude -122.4


Other Resources

Please note that while we’ve worked hard to analyzed tens of millions of flights to get you this data, we do not calculate current live prices or guarantee pricing. Please see our partners using the links above for current offers.