$1,067 Cheap Flights from London (LHR) to Sun Valley (SUN)

View $1,067 flight on Mon, Sep 29, 2025Opens in a new window

Popular airlines from Heathrow Airport (LHR) to Sun Valley, ID (SUN-Friedman Memorial)

Cheap Flights from London to Sun Valley (LHR-SUN)

Prices were available within the past 7 days and start at $1,067 for one-way flights and $1,064 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Finnair
Tue, Sep 9 - Tue, Sep 16
LHR
London
SUN
Sun Valley
$1,064 Roundtrip, found 2 days ago
$1,064
Roundtrip
found 2 days ago
Select Finnair flight, departing Tue, Sep 9 from London to Sun Valley, returning Tue, Sep 16, priced at $1,064 found 2 days ago
Finnair
Tue, Sep 9 - Tue, Sep 16
LHR
London
SUN
Sun Valley
$1,069 Roundtrip, found 2 days ago
$1,069
Roundtrip
found 2 days ago
Select Finnair flight, departing Tue, Sep 9 from London to Sun Valley, returning Tue, Sep 16, priced at $1,069 found 2 days ago
Finnair
Tue, Sep 9 - Tue, Sep 16
LHR
London
SUN
Sun Valley
$1,071 Roundtrip, found 2 days ago
$1,071
Roundtrip
found 2 days ago
Select Finnair flight, departing Tue, Sep 9 from London to Sun Valley, returning Tue, Sep 16, priced at $1,071 found 2 days ago
Icelandair
Tue, Sep 9 - Tue, Sep 16
LHR
London
SUN
Sun Valley
$1,071 Roundtrip, found 2 days ago
$1,071
Roundtrip
found 2 days ago
Select Icelandair flight, departing Tue, Sep 9 from London to Sun Valley, returning Tue, Sep 16, priced at $1,071 found 2 days ago
American Airlines
Wed, Dec 17 - Mon, Jan 5
LHR
London
SUN
Sun Valley
$1,075 Roundtrip, found 1 day ago
$1,075
Roundtrip
found 1 day ago
Select American Airlines flight, departing Wed, Dec 17 from London to Sun Valley, returning Mon, Jan 5, priced at $1,075 found 1 day ago
Icelandair
Tue, Sep 9 - Tue, Sep 16
LHR
London
SUN
Sun Valley
$1,078 Roundtrip, found 2 days ago
$1,078
Roundtrip
found 2 days ago
Select Icelandair flight, departing Tue, Sep 9 from London to Sun Valley, returning Tue, Sep 16, priced at $1,078 found 2 days ago
Finnair
Tue, Sep 9 - Tue, Sep 16
LHR
London
SUN
Sun Valley
$1,085 Roundtrip, found 2 days ago
$1,085
Roundtrip
found 2 days ago
Select Finnair flight, departing Tue, Sep 9 from London to Sun Valley, returning Tue, Sep 16, priced at $1,085 found 2 days ago
Finnair
Tue, Sep 9 - Tue, Sep 16
LHR
London
SUN
Sun Valley
$1,086 Roundtrip, found 2 days ago
$1,086
Roundtrip
found 2 days ago
Select Finnair flight, departing Tue, Sep 9 from London to Sun Valley, returning Tue, Sep 16, priced at $1,086 found 2 days ago
Delta
Tue, Dec 23 - Mon, Jan 5
LHR
London
SUN
Sun Valley
$1,774 Roundtrip, found 1 day ago
$1,774
Roundtrip
found 1 day ago
Select Delta flight, departing Tue, Dec 23 from London to Sun Valley, returning Mon, Jan 5, priced at $1,774 found 1 day ago
United
Sat, Dec 20 - Fri, Jan 2
LHR
London
SUN
Sun Valley
$2,194 Roundtrip, found 1 day ago
$2,194
Roundtrip
found 1 day ago
Select United flight, departing Sat, Dec 20 from London to Sun Valley, returning Fri, Jan 2, priced at $2,194 found 1 day ago
Flights from London (LHR) to Sun Valley (SUN)
Origin airport
Heathrow
Destination airport
Friedman Memorial
Roundtrip price
$1,063
Distance
4777 mi

London to Sun Valley Flights

The cheapest times to fly from London to Sun Valley

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from London to Sun Valley are during the month of September. You can find some of the cheapest flights from London to Sun Valley with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from London to Sun Valley

Sunday is one of the best days to book for cheap flights from London to Sun Valley: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

 

How to find cheap round-trip tickets from London to Sun Valley

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from London to Sun Valley in 2025. You can also book with separate airlines for your outbound and return journeys, from $1,067 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

 

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap London to Sun Valley flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

 

You could also save big by booking one of Expedia's vacation packages. Bundling together your London to Sun Valley airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

 

*Terms apply.

 

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

 

Frequently asked questions

How much does a flight from Heathrow Airport (LHR) to Friedman Memorial Airport (SUN) cost?
Secure a cheap one-way flight from $1,067 or cheap return flight from $1,064 from Heathrow Airport (LHR) to Friedman Memorial Airport (SUN) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to see our cheapest flight deals on this route.
What is the cheapest month to fly from Heathrow Airport (LHR) to Friedman Memorial Airport (SUN)?
Traveling in September can help you save, as it's the cheapest month for flights between LHR and SUN. You'll typically find the lowest prices during off-peak months.
What is the cheapest airline that flies from Heathrow Airport (LHR) to Friedman Memorial Airport (SUN)?
Expedia's filter tool lets you easily compare different airlines, departure times and fares all in one place. Customize the search to your preferences, then sort by "Price (lowest to highest)" to see which carrier offers the cheapest LHR to SUN flight.
How many flights per day from Heathrow Airport (LHR) to Friedman Memorial Airport (SUN)?
Nonstop flights from Heathrow Airport (LHR) to Friedman Memorial Airport (SUN) aren't available daily, so you'll have to take a flight with a layover. Explore your options with Expedia's filters. Enter your travel dates and pick either "1 Stop" or "2+ Stops."
What day of the week has the most flights from LHR to SUN?
Friday is generally the busiest day for flights, while Tuesday tends to be the quietest.* Remember that flight schedules can change based on a number of factors, such as the airline and season.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Heathrow Airport (LHR) to Friedman Memorial Airport (SUN)?
To avoid potential delays on the Heathrow Airport (LHR) to Friedman Memorial Airport (SUN) route, aim to travel before 3 PM. Departures after this time are 22% more likely to be canceled.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
Is it cheaper to buy a plane ticket from Heathrow Airport (LHR) to Friedman Memorial Airport (SUN) last-minute?
Waiting until just before your trip to book your flight from LHR to SUN often results in higher prices. While you might find some last-minute deals, there's no guarantee. Be flexible with your itinerary for the best chance of getting a bargain.
Is it cheaper to book a LHR to SUN flight and hotel package?
Securing a LHR to SUN flight and hotel package is generally cheaper than booking separately. With Expedia, you can enjoy the convenience of organizing your travels in one place. Select from our impressive range of accommodations and then add car rentals, activities and flights to your booking. Bundle it all together, and you could save hundreds of dollars.
Can I cancel or change the date of my flight from Heathrow Airport (LHR) to Friedman Memorial Airport (SUN)?
If you booked your LHR to SUN flight within the last 24 hours, you may be able to cancel or modify it at no cost. Depending on the airline and the type of ticket you purchased, additional charges may apply for changes after that time. Airline policies and contact information can be found in your itinerary or confirmation email. Or, go to our Customer Service portal for more information.

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*Available to One Key members.