The cheapest times to fly from CWL to SFO are

  • January 8th to April 1st
  • September 17th to December 9th

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 CWL to SFO is mid January. Prices can be as high as $1463 for Saturday flights during early August, or as low as $477 for Tuesday flights around mid January.


When to Fly to San Francisco

Flying from Cardiff (CWL) to San Francisco, CA (SFO) will usually cost between $480 to $1204 per person if booking more than four weeks in advance. On average the very cheapest time to fly is mid January with an average ticket price of $479. Due to high demand the most expensive time to fly is early August, with an average price of $1285. Planning your trip to low-cost times can easily save you $806 on economy flights and even more on first-class flights. Generally, any price below $596 can be considered a good price for a round-trip CWL to SFO flight.

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

CWL to SFO Flight Prices

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


Flight Prices by Day of the Week

Tuesday is usually the cheapest day to depart and return on this flight. Saturdays are the most expensive days to fly out or take a return trip. Selecting flights on the least expensive days could save you up to $197 (23%) on this flight.

Departing prices are for round-trip flights returning on the day of departure. For example, a flight departing on Tuesday and returning a week later will cost an average of $621. Return trip prices are from the SFO to CWL 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 CWL 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 28 minutes may not be realistic.


Flight Hacking CWL 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 CWL to SFO — but Champion Traveler does!

Hack #1: Paris (CWL > CDG > SFO)

  • Price for both tickets: $568
  • Average savings: $28 (4.7%)

See CWL to flights


Flight Questions Answered

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

Which airlines fly this route?

You can find 13 major airlines flying this route most often: Aer Lingus, Air Canada, Air France, Alaska, Alitalia, Brussels Airlines, Delta, Finnair, KLM, Lufthansa, SWISS, United, Virgin Atlantic, and potentially more during busy seasons.

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

The distance between the two airports is roughly 5269 miles or 8480 kilometers.

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

The real-world flight time for a nonstop CWL to SFO flight is about 10 hour 28 minutes.

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

It depends on the day of the week and the date, but a typical day might have around 32 available flights from CWL to SFO.


Airport Location Info


Departing Airport

Origination code CWL
Origination airport name Cardiff Airport
City Cardiff
Country the United Kingdom
Latitude 51.4
Longitude -3.3

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.