The cheapest times to fly from SUN to LHR are

  • January 29th to May 20th (except the week of April 2nd)
  • November 5th to November 18th

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 SUN to LHR is early to mid February. Prices can be as high as $1885 for Saturday flights during early to mid August, or as low as $573 for Tuesday flights around early to mid February.


When to Fly to London

Flying from Sun Valley/Hailey/Ketchum, ID (SUN) to London (LHR) will usually cost between $586 to $1532 per person if booking more than four weeks in advance. On average the very cheapest time to fly is early to mid February with an average ticket price of $625. Due to high demand the most expensive time to fly is early to mid August, with an average price of $1721. Planning your trip to low-cost times can easily save you $1096 on economy flights and even more on first-class flights. Generally, any price below $834 can be considered a good price for a round-trip SUN to LHR flight.

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

SUN to LHR Flight Prices

Compared to other flights, the SUN to LHR flight is cheaper than the average and costs about as much as the average flight leaving from Sun Valley. The average price per mile (for a direct flight) is $0.11, 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 $161 (12%) 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 $886. Return trip prices are from the LHR to SUN 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 SUN to LHR can generally find a 1-layover flight. Because there is not usually a direct flight option the real-world direct flight time of 9 hour 35 minutes may not be realistic.


Flight Hacking SUN to LHR

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 SUN to LHR — but Champion Traveler does!

Hack #1: Seattle, WA (SUN > SEA > LHR)

  • Price for both tickets: $774
  • Average savings: $60 (7.19%)

See SUN to SEA flights

Hack #2: San Jose, CA (SUN > SJC > LHR)

  • Price for both tickets: $791
  • Average savings: $44 (5.22%)

See SUN to SJC flights

Hack #3: Oakland, CA (SUN > OAK > LHR)

  • Price for both tickets: $798
  • Average savings: $37 (4.38%)

See SUN to OAK flights


Flight Questions Answered

Still have questions about flying from SUN to LHR? We’ve got answers.

Which airlines fly this route?

You can find 7 major airlines flying this route most often: Aeromexico, Air France, American, Delta, KLM, United, Virgin Atlantic, and potentially more during busy seasons.

How far away is it from London Heathrow Airport to Friedman Memorial Airport?

The distance between the two airports is roughly 4777 miles or 7688 kilometers.

How long does it take to fly from SUN to LHR?

The real-world flight time for a nonstop SUN to LHR flight is about 9 hour 35 minutes.

How many flights go between Sun Valley/Hailey/Ketchum, ID and London?

It depends on the day of the week and the date, but a typical day might have around 9 available flights from SUN to LHR.


Airport Location Info


Departing Airport

Origination codeSUN
Origination airport nameFriedman Memorial Airport
CitySun Valley/Hailey/Ketchum, ID
Countrythe United States

Return Airport

Destination codeLHR
Destination airport nameLondon Heathrow Airport
Countrythe United Kingdom


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.