Find flights
When to book
FAQs

Cheap flights from Idaho to London Heathrow Airport from £246

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 19/4. Fares are subject to change and may not be available on all flights or dates of travel.
BOI — LHR
6 Apr — 13 Apr1
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 7 March 2026.

Tue 6/1010:38
BOI
-
LHR
2 stops24h 52m
Scandinavian Airlines
Tue 20/1010:20
LHR
-
BOI
2 stops19h 48m
Scandinavian Airlines
Deal found 3/3£528
Tue 6/1010:38
BOI
-
LHR
2 stops22h 22m
Scandinavian Airlines
Tue 13/1010:20
LHR
-
BOI
2 stops19h 48m
Scandinavian Airlines
Deal found 6/3£539
Tue 15/913:00
GEG
-
LHR
2 stops20h 40m
Scandinavian Airlines
Sat 26/906:40
LHR
-
GEG
2 stops20h 07m
Scandinavian Airlines
Deal found 5/3£539
Tue 22/913:00
GEG
-
LHR
2 stops21h 30m
Scandinavian Airlines
Sat 3/1006:40
LHR
-
GEG
2 stops18h 28m
Scandinavian Airlines
Deal found 6/3£539
Tue 22/912:42
BOI
-
LHR
2 stops22h 48m
Scandinavian Airlines
Mon 28/919:50
LHR
-
BOI
3 stops29h 45m
Scandinavian Airlines
Deal found 6/3£545
Tue 29/910:23
BOI
-
LHR
2 stops22h 37m
Scandinavian Airlines
Tue 6/1006:40
LHR
-
BOI
2 stops18h 53m
Scandinavian Airlines
Deal found 4/3£548
Tue 22/912:42
BOI
-
LHR
2 stops21h 58m
Scandinavian Airlines
Mon 5/1018:40
LHR
-
BOI
2 stops32h 37m
Scandinavian Airlines
Deal found 2/3£550
Mon 17/815:30
BOI
-
LHR
2 stops41h 30m
Scandinavian Airlines
Tue 25/806:40
LHR
-
BOI
2 stops23h 24m
Scandinavian Airlines
Deal found 6/3£551
Fri 2/1012:42
BOI
-
LHR
2 stops37h 38m
Scandinavian Airlines
Fri 9/1010:20
LHR
-
BOI
2 stops39h 13m
Scandinavian Airlines
Deal found 4/3£552
Fri 25/913:00
GEG
-
LHR
2 stops36h 20m
Scandinavian Airlines
Sat 10/1006:40
LHR
-
GEG
2 stops20h 08m
Scandinavian Airlines
Deal found 4/3£552
Sun 27/913:00
GEG
-
LHR
2 stops24h 40m
Scandinavian Airlines
Fri 9/1006:40
LHR
-
GEG
2 stops18h 29m
Scandinavian Airlines
Deal found 4/3£569
Sun 27/912:42
BOI
-
LHR
2 stops37h 38m
Scandinavian Airlines
Mon 5/1010:20
LHR
-
BOI
2 stops40h 57m
Scandinavian Airlines
Deal found 4/3£574

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 7 March 2026.

Round-trip from

£551

One-way from

£246

Popular in

January

Cheapest in

October

Average price

£616
Scandinavian Airlines
  • Scandinavian Airlines
  • 17/8-25/8
  • 4 total stops
  • 64h 54m total
  • Idaho to London
Search Deals
19/4
  • 19/4
  • 3 total stops
  • 27h 25m total
  • Idaho to London
Search Deals
Highest demand for flights based on searches. 23% potential increase in price (£172 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 March 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 7 March 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

Sun 26/4

08:59-12:10

1 stop20h 11m

London Heathrow

Wed 6/5

06:30-16:14

2 stops16h 44m

£644

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Tue 7/4

13:10-13:50

2 stops17h 40m

London Heathrow

Tue 14/4

06:30-18:17

2 stops18h 47m

£655

SpokaneLondon

GEG - LHR

GEGLHR

Spokane

Wed 1/4

07:10-06:55

2 stops15h 45m

London Heathrow

Fri 17/4

07:25-21:35

2 stops22h 10m

£663

BoiseLondon

BOI - LHR

BOILHR

Boise Air Term. Gowen Fld

Mon 27/4

14:18-11:20

1 stop14h 02m

London Heathrow

Fri 8/5

06:30-20:34

2 stops21h 04m

£666

BoiseLondon

BOI - LHR

BOILHR

Boise Air Term. Gowen Fld

Tue 1/9

08:15-07:25

1 stop16h 10m

London Heathrow

Wed 30/9

14:05-13:30

2 stops30h 25m

£667

SpokaneLondon

GEG - LHR

GEGLHR

Spokane

Mon 30/3

07:10-06:45

1 stop15h 35m

London Heathrow

Mon 6/4

10:50-21:34

2 stops42h 44m

£667

BoiseLondon

BOI - LHR

BOILHR

Boise Air Term. Gowen Fld

Mon 27/4

15:44-13:50

2 stops15h 06m

London Heathrow

Mon 4/5

11:45-22:24

2 stops17h 39m

£669

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Tue 7/4

14:30-09:40

1 stop12h 10m

London Heathrow

Tue 14/4

11:25-21:04

1 stop16h 39m

£669

BoiseLondon

BOI - LHR

BOILHR

Boise Air Term. Gowen Fld

Wed 1/4

12:04-08:30

1 stop13h 26m

London Heathrow

Wed 8/4

11:05-23:02

1 stop18h 57m

£669
Fastest return journey

BoiseLondon

BOI - LHR

BOILHR

Boise Air Term. Gowen Fld

Sun 26/4

17:29-12:20

1 stop11h 51m

London Heathrow

Sun 3/5

14:50-21:17

1 stop13h 27m

£684

Flights are sorted by cheapest return flights first.

Deals found on 7/3

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, October is the cheapest month in which you can book a flight from Idaho to London Heathrow Airport (average of £465). Flying from Idaho to London Heathrow Airport in June is currently the most expensive (average of £812). 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 KLM, United Airlines, and Delta fly from Idaho to London Heathrow Airport in about 14h 02m. The time it takes to get you to your destination can typically vary by up to 3h 38m. There are 4829 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 Idaho Falls Fanning Field - 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, October is the cheapest month in which you can book a flight from Idaho to London Heathrow Airport (average of £465). Flying from Idaho to London Heathrow Airport in June is currently the most expensive (average of £812). 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
Croydon
Wembley
Northampton
Luton
Gatwick
Slough
Hounslow
Ilford
Hayes
Brentford
Colchester
Guildford
Watford
Kingston upon Thames
Eastbourne
Chelmsford
Ipswich
Swindon
Bedford

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.
John F Kennedy Intl to Heathrow flights
Newark to Heathrow flights
John F Kennedy Intl to Gatwick flights
Boston to Heathrow flights
LaGuardia to Heathrow flights
Dulles Intl to Heathrow flights
Newark to Gatwick flights
John F Kennedy Intl to Stansted flights
John F Kennedy Intl to London City flights
Los Angeles to Heathrow flights
O'Hare Intl to Heathrow flights
Baltimore to Heathrow flights
Dallas/Fort Worth to Heathrow flights
LaGuardia to Gatwick flights
San Francisco to Heathrow flights
Seattle to Heathrow flights
Boston to Gatwick flights
Orlando to Heathrow flights
Newark to Stansted flights
Atlanta to Heathrow flights
Newark to Luton flights
Miami to Heathrow flights
Hobby to Heathrow flights
Boston to London City flights
Dulles Intl to Gatwick flights
Reagan-National to Heathrow flights
Boston to Stansted flights
Denver to Heathrow flights
Dulles Intl to London City flights
Newark to London City flights
Los Angeles to Gatwick flights
O'Hare Intl to Gatwick flights
Philadelphia to Heathrow flights
Reagan-National to Gatwick flights
Baltimore to Gatwick flights
O'Hare Intl to London City flights
O'Hare Intl to Stansted flights
George Bush Intcntl to Heathrow flights
Los Angeles to Stansted flights
Minneapolis to Heathrow flights
Tampa to Heathrow flights
Los Angeles to London City flights
Austin to Heathrow flights
Seattle to Gatwick flights
Orlando to Gatwick flights
Raleigh to Heathrow flights
Dallas/Fort Worth to Gatwick flights
Charlotte to Heathrow 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.