Find flights
When to book
FAQs

Cheap flights from Idaho to London Heathrow Airport from £248

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 15/9. Fares are subject to change and may not be available on all flights or dates of travel.
BOI — LHR
16 Jun — 23 Jun1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Idaho to Heathrow

Enter your travel dates to find the best prices.

Cheapest flights from Idaho to Heathrow
Explore the most affordable flight options available from Idaho to Heathrow. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 17 May 2026.

Tue 10/1111:45
BOI
-
LHR
1 stop16h 30m
United Airlines
Thu 12/1111:05
LHR
-
BOI
2 stops43h 01m
United Airlines
Deal found 16/5£561
Tue 10/1105:00
GEG
-
LHR
2 stops21h 15m
United Airlines
Thu 12/1106:35
LHR
-
GEG
2 stops22h 34m
United Airlines
Deal found 13/5£563
Tue 1/905:00
GEG
-
LHR
2 stops19h 20m
United Airlines
Thu 3/907:30
LHR
-
GEG
2 stops21h 44m
United Airlines
Deal found 13/5£574
Tue 13/1012:50
GEG
-
LHR
1 stop34h 35m
Lufthansa
Fri 16/1007:25
LHR
-
GEG
2 stops35h 05m
Lufthansa
Deal found 12/5£609
Sun 30/805:00
GEG
-
LHR
1 stop20h 40m
United Airlines
Tue 1/907:30
LHR
-
GEG
2 stops21h 44m
United Airlines
Deal found 13/5£613
Mon 31/805:00
GEG
-
LHR
2 stops22h 55m
United Airlines
Wed 2/907:30
LHR
-
GEG
2 stops21h 44m
United Airlines
Deal found 13/5£616
Sat 29/815:54
GEG
-
LHR
1 stop33h 46m
United Airlines
Tue 1/909:30
LHR
-
GEG
2 stops19h 44m
United Airlines
Deal found 13/5£617
Tue 13/1013:37
GEG
-
LHR
2 stops36h 23m
United Airlines
Fri 16/1007:25
LHR
-
GEG
2 stops21h 28m
United Airlines
Deal found 12/5£633
Wed 9/915:54
GEG
-
LHR
1 stop12h 41m
United Airlines
Wed 7/1008:40
LHR
-
GEG
2 stops33h 50m
United Airlines
Deal found 16/5£646
Thu 27/806:00
GEG
-
LHR
2 stops19h 35m
United Airlines
Sat 29/807:30
LHR
-
GEG
2 stops21h 44m
United Airlines
Deal found 13/5£652
Tue 18/814:20
IDA
-
LHR
1 stop14h 50m
American Airlines
Tue 25/808:15
LHR
-
IDA
2 stops20h 05m
American Airlines
Deal found 16/5£653
Fri 23/1005:00
BOI
-
LHR
2 stops44h 30m
United Airlines
Mon 26/1007:30
LHR
-
BOI
2 stops19h 45m
United Airlines
Deal found 16/5£657

Find flight deals from Idaho to Heathrow

Keep the following information in mind while searching for Idaho to Heathrow flight deals. Data was last updated 17 May 2026.

Round-trip from

£561

One-way from

£248

Popular in

January

Cheapest in

April

Average price

£624
United Airlines
  • United Airlines
  • 10/11-12/11
  • 3 total stops
  • 59h 31m total
  • Idaho to London
Search Deals
Virgin Atlantic
  • Virgin Atlantic
  • 15/9
  • 2 total stops
  • 16h 05m total
  • Idaho to London
Search Deals
Highest demand for flights based on searches. 19% potential increase in price (£140 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 9% potential price decrease (£49 potential savings vs. average return price).
Search Deals
Average for round-trip flights in May 2026
Search Deals

Cheapflights Fare Finder

 
Customise your flight search to find flights from Idaho to Heathrow that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 858,174 searches. Data last updated 17 May 2026.
Use the filters below to find and compare flights from Idaho to London Heathrow Airport that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

BoiseLondon

BOI - LHR

BOILHR

Boise Air Term. Gowen Fld

Tue 10/11

11:45-11:15

1 stop16h 30m

London Heathrow

Thu 12/11

11:05-23:06

2 stops43h 01m

£561

SpokaneLondon

GEG - LHR

GEGLHR

Spokane

Tue 10/11

11:30-07:55

1 stop12h 25m

London Heathrow

Thu 12/11

06:35-21:09

2 stops22h 34m

£563

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Tue 18/8

14:20-12:10

1 stop14h 50m

London Heathrow

Tue 25/8

08:15-21:20

2 stops20h 05m

£653

BoiseLondon

BOI - LHR

BOILHR

Boise Air Term. Gowen Fld

Fri 23/10

05:00-08:30

2 stops44h 30m

London Heathrow

Mon 26/10

07:30-21:15

2 stops19h 45m

£657

LewistonLondon

LWS - LHR

LWSLHR

Lewiston Nez Perce Rgnl

Tue 15/9

12:30-11:00

1 stop14h 30m

London Heathrow

Fri 25/9

08:40-22:50

2 stops22h 10m

£659

SpokaneLondon

GEG - LHR

GEGLHR

Spokane

Mon 5/10

15:05-15:35

1 stop16h 30m

London Heathrow

Thu 28/1

06:30-14:45

2 stops16h 15m

£659

LewistonLondon

LWS - LHR

LWSLHR

Lewiston Nez Perce Rgnl

Wed 16/9

06:25-12:10

1 stop21h 45m

London Heathrow

Fri 25/9

06:30-22:50

2 stops24h 20m

£659

LewistonLondon

LWS - LHR

LWSLHR

Lewiston Nez Perce Rgnl

Sat 19/9

12:30-06:20

2 stops33h 50m

London Heathrow

Thu 24/9

09:55-22:50

2 stops20h 55m

£662

SpokaneLondon

GEG - LHR

GEGLHR

Spokane

Sat 3/10

11:30-21:20

2 stops25h 50m

London Heathrow

Tue 27/10

06:35-21:09

2 stops21h 34m

£662

SpokaneLondon

GEG - LHR

GEGLHR

Spokane

Mon 5/10

05:00-10:00

2 stops21h 00m

London Heathrow

Thu 28/1

06:35-23:38

2 stops25h 03m

£662

Flights are sorted by cheapest return flights first.

Deals found on 15/5

Showing 1-10 of 60 resultsSorted by cheapest first
1
2
3
...
6

Best time to book a flight from Idaho to Heathrow

Have a flexible travel schedule? Discover the best time to fly to Heathrow from Idaho with our price prediction graph.
Estimated return price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Idaho to London Heathrow Airport

What is the cheapest month to book a flight from Idaho to London Heathrow Airport?

Currently, July is the cheapest month in which you can book a flight from Idaho to London Heathrow Airport (average of £433). Flying from Idaho to London Heathrow Airport in June is currently the most expensive (average of £888). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

How much does it cost for a return flight from Idaho to London Heathrow Airport?

Related info for your journey

Find useful and relevant information for your journey from Idaho to Heathrow. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • How long is the flight from Idaho to London Heathrow Airport?

    Airlines like United Airlines, American Airlines, and Delta fly from Idaho to London Heathrow Airport in about 14h 30m. The time it takes to get you to your destination can typically vary by up to 2h. There are 4697 mi between Idaho and London Heathrow Airport. When browsing for deals, the options you’ll see will be for both direct flights and flights with stops.

  • What are the most popular routes from Idaho to London Heathrow Airport?

    The most popular route from Idaho to London Heathrow Airport is Boise Air Term. Gowen Fld - London Heathrow. You may also consider Spokane - London Heathrow or Jackson Hole - London Heathrow.

  • Can I find deals for flights from Idaho to Heathrow that include hotel bookings?

    Yes. In addition to deals on Idaho to Heathrow flights, Cheapflights offers holiday packages that include both flights and hotel.

  • How can I find direct flights from Idaho to Heathrow?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Idaho to Heathrow.

  • Can I find deals for business class flights from Idaho to Heathrow?

    Yes. Cheapflights offers flight deals from Idaho to Heathrow by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Idaho to London Heathrow Airport?

    Currently, July is the cheapest month in which you can book a flight from Idaho to London Heathrow Airport (average of £433). Flying from Idaho to London Heathrow Airport in June is currently the most expensive (average of £888). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Travelling to a place near London Heathrow Airport?

Book flights to London Heathrow Airport if you plan to visit one of these locations
Milton Keynes
Hounslow
Croydon
Wembley
Northampton
Luton
Gatwick
Slough
Ilford
Hayes
Brentford
Colchester
Romford
Watford
Kingston upon Thames
Eastbourne
Swindon
Ipswich
Southend-on-Sea
Guildford

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Idaho to Heathrow

See prices for flight routes from nearby airports that may be better suited for you.
Newark to Heathrow flights
John F Kennedy Intl to Heathrow flights
Newark to Gatwick flights
John F Kennedy Intl to Gatwick flights
John F Kennedy Intl to Stansted flights
John F Kennedy Intl to London City flights
LaGuardia to Heathrow flights
LaGuardia to Gatwick flights
Dulles Intl to Heathrow flights
Boston to Heathrow flights
Los Angeles to Heathrow flights
Newark to Stansted flights
Baltimore to Heathrow flights
Newark to Luton flights
LaGuardia to Stansted flights
San Francisco to Heathrow flights
O'Hare Intl to Heathrow flights
Boston to Gatwick flights
Dallas/Fort Worth to Heathrow flights
Seattle to Heathrow flights
Newark to London City flights
Hobby to Heathrow flights
Orlando to Heathrow flights
Philadelphia to Heathrow flights
Dulles Intl to Gatwick flights
Atlanta to Heathrow flights
Reagan-National to Heathrow flights
Boston to London City flights
Dulles Intl to London City flights
Miami to Heathrow flights
George Bush Intcntl to Heathrow flights
Los Angeles to Gatwick flights
Boston to Stansted flights
Baltimore to Gatwick flights
Los Angeles to Stansted flights
Denver to Heathrow flights
Reagan-National to Gatwick flights
Los Angeles to London City flights
San Francisco to Gatwick flights
O'Hare Intl to Gatwick flights
O'Hare Intl to Stansted flights
Sky Harbor Intl to Heathrow flights
Orlando to Gatwick flights
Tampa to Heathrow flights
San Francisco to Stansted flights
San Francisco to London City flights
O'Hare Intl to London City flights

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travellers can enjoy low prices and a wide availability of flights to their desired destinations.

How does Cheapflights help users find flights from Idaho to Heathrow?

Cheapflights goes through 900+ travel sites to look for the best flight deals for flights from Idaho to Heathrow. Too many options? Cheapflights also provides filters for things like airlines, price ranges, and number of stops to help you make a decision easily.

Why should you use Cheapflights to find cheap flight tickets from Idaho to Heathrow?

Cheapflights helps you find that perfect flight to Heathrow from Idaho by searching from hundreds of airlines and agencies you know and love. We are also free to use, in case you were wondering!

Can Cheapflights find flights from Idaho to Heathrow with no change fees?

Need flexible booking options for your flight to Heathrow from Idaho? Don’t worry, Cheapflights have you covered. Use our search filter to only show flights with no change fees.

Can Cheapflights notify me if prices for flights from Idaho to Heathrow become cheaper?

Not ready to book yet? You can track prices for flights from Idaho to Heathrow on Cheapflights with our Price Alert feature and get notified when better prices are available.

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.