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Heathrow

$304+ Cheap flights from Idaho to Heathrow (LHR)

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 1/16. Fares are subject to change and may not be available on all flights or dates of travel.
BOI — LHR
Jan 17 — Jan 241
Sat 1/17
Sat 1/24
1 adult, Economy
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Cheap flight deals from Idaho to Heathrow

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 December 18, 2025.

This United Airlines deal was found by Cheapflights users on 12/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/315:05 amGEG - LHR
1 stop20h 35mUnited Airlines
Thu 1/811:10 amLHR - GEG
2 stops36h 11mUnited Airlines
Deal found 12/16$824
This KLM deal was found by Cheapflights users on 12/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/316:00 amGEG - LHR
1 stop17h 05mKLM
Thu 1/811:05 amLHR - GEG
1 stop16h 49mKLM
Deal found 12/16$841
This Air Canada deal was found by Cheapflights users on 12/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/315:05 amGEG - LHR
2 stops18h 05mMultiple Airlines
Thu 1/81:00 pmLHR - GEG
3 stops31h 46mMultiple Airlines
Deal found 12/16$955
This Icelandair deal was found by Cheapflights users on 12/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Icelandair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/169:10 amBOI - LHR
2 stops18h 40mMultiple Airlines
Wed 1/1412:15 pmLHR - BOI
2 stops18h 44mMultiple Airlines
Deal found 12/15$1,577
This KLM deal was found by Cheapflights users on 12/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/265:55 amGEG - LHR
1 stop20h 05mMultiple Airlines
Tue 1/66:20 amLHR - GEG
2 stops17h 55mMultiple Airlines
Deal found 12/17$1,612
This FlightHub deal was found by Cheapflights users on 12/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/266:00 amGEG - LHR
2 stops23h 30mLufthansa
Tue 1/67:25 amLHR - GEG
2 stops21h 57mLufthansa
Deal found 12/17$1,632
This KLM deal was found by Cheapflights users on 12/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/266:00 amGEG - LHR
1 stop17h 05mKLM
Tue 1/610:45 amLHR - GEG
1 stop13h 30mKLM
Deal found 12/17$1,634
This Air Canada deal was found by Cheapflights users on 12/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/316:00 amGEG - LHR
3 stops21h 20mAir Canada
Thu 1/81:00 pmLHR - GEG
3 stops31h 46mAir Canada
Deal found 12/16$1,647
This Cheapflightsfares deal was found by Cheapflights users on 12/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/162:49 pmBOI - LHR
1 stop11h 51mLufthansa
Wed 1/147:30 amLHR - BOI
2 stops17h 37mLufthansa
Deal found 12/15$1,648
This Cheapflightsfares deal was found by Cheapflights users on 12/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/222:40 pmBOI - LHR
1 stop12h 00mLufthansa
Mon 12/298:15 pmLHR - BOI
2 stops28h 48mLufthansa
Deal found 12/17$1,668
This Cheapflightsfares deal was found by Cheapflights users on 12/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/182:30 pmJAC - LHR
1 stop12h 10mLufthansa
Mon 12/226:35 amLHR - JAC
2 stops21h 17mLufthansa
Deal found 12/17$1,690
This Ovago deal was found by Cheapflights users on 12/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Ovago is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/185:05 amGEG - LHR
1 stop20h 35mLufthansa
Thu 12/256:35 amLHR - GEG
2 stops22h 23mLufthansa
Deal found 12/17$1,768

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 December 18, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$597
(Cheapflightsfares)

One-way from

$304
(Kiwi.com)

Popular in

June

Cheapest in

October

Average price

$949
Provider with most accurate pricing for Boise Air Term. Gowen Fld-London (LON) flight deals.
Search Deals
Provider most trusted by Cheapflights users for Boise Air Term. Gowen Fld-London (LON) flights.
Search Deals
From Idaho to London Heathrow
Search Deals
One-way flight from Idaho to London Heathrow
Search Deals
Highest demand for flights based on searches. 23% potential increase in price ($276 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 5% potential price decrease ($49 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
Search Deals

Cheapflights Fare Finder

 
Customize 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 2,558,603 searches. Data last updated December 18, 2025.
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

SpokaneLondon

GEG - LHR

GEGLHR

Spokane

Wed 3/4

12:38 pm-12:00 pm

1 stop15h 22m

London Heathrow

Wed 3/11

7:40 am-9:18 pm

2 stops20h 38m

$597

SpokaneLondon

GEG - LHR

GEGLHR

Spokane

Tue 2/24

7:00 am-7:25 am

1 stop16h 25m

London Heathrow

Tue 3/10

7:40 am-9:03 pm

2 stops20h 23m

$597

BoiseLondon

BOI - LHR

BOILHR

Boise Air Term. Gowen Fld

Sat 2/14

12:16 pm-7:55 am

1 stop12h 39m

London Heathrow

Sun 2/22

11:35 am-9:32 pm

1 stop16h 57m

$602

SpokaneLondon

GEG - LHR

GEGLHR

Spokane

Wed 2/25

1:44 pm-5:05 pm

2 stops19h 21m

London Heathrow

Wed 3/11

6:35 am-9:03 pm

2 stops21h 28m

$605

BoiseLondon

BOI - LHR

BOILHR

Boise Air Term. Gowen Fld

Tue 2/17

2:40 pm-9:40 am

1 stop12h 00m

London Heathrow

Tue 2/24

7:30 am-9:32 pm

2 stops21h 02m

$607

SpokaneLondon

GEG - LHR

GEGLHR

Spokane

Tue 2/17

1:44 pm-10:20 pm

2 stops24h 36m

London Heathrow

Wed 3/4

6:35 am-9:07 pm

2 stops22h 32m

$615

SpokaneLondon

GEG - LHR

GEGLHR

Spokane

Thu 1/15

6:53 am-11:50 am

2 stops20h 57m

London Heathrow

Thu 1/22

6:35 am-7:16 pm

2 stops20h 41m

$619

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Thu 1/15

4:19 pm-7:30 am

2 stops32h 11m

London Heathrow

Wed 1/28

6:35 am-9:56 am

2 stops34h 21m

$620

SpokaneLondon

GEG - LHR

GEGLHR

Spokane

Wed 1/14

5:15 am-10:00 am

1 stop20h 45m

London Heathrow

Sat 1/31

6:30 am-3:00 pm

2 stops16h 30m

$620

JacksonLondon

JAC - LHR

JACLHR

Jackson Hole

Fri 1/16

12:58 pm-8:10 pm

2 stops24h 12m

London Heathrow

Fri 1/23

8:25 pm-4:24 pm

2 stops26h 59m

$622

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/17

Showing 1-10 of 48 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 round-trip 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 $603). Flying from Idaho to London Heathrow Airport in June is currently the most expensive (average of $1,085). 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.

What is the cheapest time of day to fly from ID to LHR?

Find hourly flight availability from Idaho to Heathrow. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated December 18, 2025.

It’s optimal to fly from Idaho to London Heathrow Airport in the afternoon. By choosing this option you can save up to 13% on the cost of your flight, compared to a flight at noon.

What is the cheapest day to fly from Idaho to London Heathrow Airport?

Use this chart to determine the cheapest time to fly round-trip from Idaho to Heathrow. Price data was last updated on December 16, 2024.

Travelers seeking maximum savings on their Idaho to London Heathrow Airport flight should consider departing on Thursday at noon when fares are most often at their lowest. Friday evenings flights should be avoided if possible as fares are typically the most expensive at this time.

How much does it cost to fly round-trip 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 Lufthansa, United Airlines, and KLM fly from Idaho to London Heathrow Airport in about 15h 22m. The time it takes to get you to your destination can typically vary by up to 18h 48m. Idaho and London Heathrow Airport are separated by a distance of 4643 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

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

    Most travelers choose Spokane - London Heathrow, Boise Air Term. Gowen Fld - London Heathrow or Idaho Falls Fanning Field - London Heathrow when deciding on the best route from Idaho to London Heathrow Airport.

  • 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 vacation 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 $603). Flying from Idaho to London Heathrow Airport in June is currently the most expensive (average of $1,085). 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

Traveling to a place near London Heathrow Airport?

Book flights to London Heathrow Airport if you plan to visit one of these locations
Ilford
Hounslow
Southend-on-Sea
Harrow
Eastleigh
Dartford
Dover
Winchester
Croydon
Orpington
Northampton
Watford
Hayes
Borehamwood
Broadway
Aylesbury
Chipping Norton
Horley
Kingston upon Thames
Wembley

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.
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Top 5 airlines flying from Idaho to Heathrow

Discover the top 5 airlines that operate flights from Idaho to Heathrow. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated December 18, 2025.
AirlineCheapestAverageFlexibilityOn-time
KLMCheapest$577Average$774FlexibilityNo cancel feeOn-time75%
Virgin AtlanticCheapest$604Average$915FlexibilityNo cancel feeOn-time72%
United AirlinesCheapest$639Average$988FlexibilityNo cancel feeOn-time69%
DeltaCheapest$701Average$980FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$703Average$992FlexibilityNo cancel feeOn-time71%

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