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Cheap flights from Idaho to London Heathrow Airport from £295

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 26/3. Fares are subject to change and may not be available on all flights or dates of travel.
BOI — LHR
22 Mar — 29 Mar1
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 20 February 2026.

Mon 13/412:35
GEG
-
LHR
2 stops26h 05m
Lufthansa
Thu 30/406:55
LHR
-
GEG
2 stops22h 21m
Lufthansa
Deal found 17/2£464
Sun 12/419:30
BOI
-
LHR
1 stop33h 40m
Virgin Atlantic
Tue 28/408:40
LHR
-
BOI
2 stops22h 37m
Virgin Atlantic
Deal found 17/2£475
Sun 12/417:29
BOI
-
LHR
1 stop11h 51m
United Airlines
Tue 28/410:50
LHR
-
BOI
2 stops30h 04m
United Airlines
Deal found 19/2£481
Mon 13/416:01
GEG
-
LHR
1 stop12h 19m
United Airlines
Thu 30/407:25
LHR
-
GEG
2 stops22h 15m
United Airlines
Deal found 17/2£482
Sun 12/409:00
BOI
-
LHR
1 stop20h 10m
Delta
Tue 28/406:15
LHR
-
BOI
2 stops16h 59m
Delta
Deal found 19/2£486
Sun 12/406:00
BOI
-
LHR
2 stops31h 20m
Multiple Airlines
Tue 28/413:05
LHR
-
BOI
2 stops16h 57m
Multiple Airlines
Deal found 17/2£488
Tue 7/417:20
IDA
-
LHR
1 stop33h 20m
United Airlines
Tue 14/407:30
LHR
-
IDA
2 stops33h 23m
United Airlines
Deal found 16/2£490
Tue 5/514:31
IDA
-
LHR
1 stop12h 09m
United Airlines
Wed 13/507:30
LHR
-
IDA
2 stops33h 25m
United Airlines
Deal found 17/2£490
Thu 19/305:00
GEG
-
LHR
2 stops19h 10m
United Airlines
Thu 26/310:05
LHR
-
GEG
1 stop17h 58m
United Airlines
Deal found 17/2£493
Sun 12/413:45
BOI
-
LHR
1 stop18h 50m
KLM
Tue 28/414:30
LHR
-
BOI
1 stop15h 30m
KLM
Deal found 19/2£495
Thu 19/306:00
GEG
-
LHR
1 stop18h 05m
Virgin Atlantic
Thu 26/311:05
LHR
-
GEG
1 stop17h 24m
Virgin Atlantic
Deal found 17/2£498
Tue 7/407:48
IDA
-
LHR
1 stop20h 02m
American Airlines
Tue 14/416:10
LHR
-
IDA
1 stop14h 29m
American Airlines
Deal found 16/2£503

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 20 February 2026.

Round-trip from

£464

One-way from

£295

Popular in

January

Cheapest in

October

Average price

£764
Lufthansa
  • Lufthansa
  • 13/4-30/4
  • 4 total stops
  • 48h 26m total
  • Idaho to London
Search Deals
26/3
  • 26/3
  • 2 total stops
  • 16h 35m total
  • Idaho to London
Search Deals
Highest demand for flights based on searches. 22% potential increase in price (£163 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 9% potential price decrease (£48 potential savings vs. average return price).
Search Deals
Average for round-trip flights in February 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 20 February 2026.
Use the filters below to find and compare flights from Idaho to London Heathrow Airport that are best for you.

Fly from

Idaho

Fly to

Heathrow

Route

Depart

Return

Price

BoiseLondon

BOI - LHR

BOILHR

Boise Air Term. Gowen Fld

Sun 12/4

17:29-12:20

1 stop11h 51m

London Heathrow

Tue 28/4

10:50-09:54

2 stops30h 04m

£481

SpokaneLondon

GEG - LHR

GEGLHR

Spokane

Mon 13/4

16:01-12:20

1 stop12h 19m

London Heathrow

Thu 30/4

07:25-21:40

2 stops22h 15m

£482

BoiseLondon

BOI - LHR

BOILHR

Boise Air Term. Gowen Fld

Sun 12/4

09:00-12:10

1 stop20h 10m

London Heathrow

Tue 28/4

06:15-16:14

2 stops16h 59m

£486

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Tue 7/4

17:20-09:40

1 stop33h 20m

London Heathrow

Tue 14/4

07:30-09:53

2 stops33h 23m

£490

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Tue 5/5

14:31-09:40

1 stop12h 09m

London Heathrow

Wed 13/5

07:30-09:55

2 stops33h 25m

£490

BoiseLondon

BOI - LHR

BOILHR

Boise Air Term. Gowen Fld

Sun 12/4

13:45-15:35

1 stop18h 50m

London Heathrow

Tue 28/4

14:30-23:00

1 stop15h 30m

£495

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Tue 7/4

07:48-10:50

1 stop20h 02m

London Heathrow

Tue 14/4

16:10-23:39

1 stop14h 29m

£503

SpokaneLondon

GEG - LHR

GEGLHR

Spokane

Mon 13/4

15:30-15:35

1 stop16h 05m

London Heathrow

Thu 30/4

10:55-16:30

1 stop13h 35m

£503

BoiseLondon

BOI - LHR

BOILHR

Boise Air Term. Gowen Fld

Wed 22/4

14:37-12:20

1 stop14h 43m

London Heathrow

Sun 26/4

09:00-22:35

2 stops20h 35m

£518

SpokaneLondon

GEG - LHR

GEGLHR

Spokane

Wed 15/4

05:05-09:40

1 stop20h 35m

London Heathrow

Sat 25/4

07:25-21:35

2 stops22h 10m

£518

Flights are sorted by cheapest return flights first.

Deals found on 17/2

Showing 1-10 of 50 results
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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 £462). Flying from Idaho to London Heathrow Airport in June is currently the most expensive (average of £805). 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, Delta, and KLM fly from Idaho to London Heathrow Airport in about 11h 51m. The time it takes to get you to your destination can typically vary by up to 8h 19m. 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 £462). Flying from Idaho to London Heathrow Airport in June is currently the most expensive (average of £805). 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
Luton
Croydon
Wembley
Northampton
Gatwick
Slough
Hounslow
Ilford
Hayes
Brentford
Colchester
Watford
Guildford
Kingston upon Thames
Eastbourne
Ipswich
Chelmsford
Swindon
Bedford

Browse thousands of different options on Cheapflights for your next trip

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Alternative routes for Idaho to Heathrow

See prices for flight routes from nearby airports that may be better suited for you.
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O'Hare Intl to London City flights
Los Angeles to London City flights
O'Hare Intl to Stansted flights
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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.

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