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$340+ 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 3/8. Fares are subject to change and may not be available on all flights or dates of travel.
BOI — LHR
Dec 3 — Dec 101
Wed 12/3
Wed 12/10
1 adult, Economy
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Find 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 November 3, 2025.

This KLM deal was found by Cheapflights users on 11/1. 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 11/512:51 pmGEG - LHR
1 stop14h 49mMultiple Airlines
Wed 11/196:20 amLHR - GEG
2 stops17h 28mMultiple Airlines
Deal found 11/1$590
This Delta deal was found by Cheapflights users on 11/1. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/191:50 pmBOI - LHR
1 stop13h 40mDelta
Wed 11/266:30 amLHR - BOI
2 stops16h 35mDelta
Deal found 11/1$591
This Delta deal was found by Cheapflights users on 11/1. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/121:15 pmGEG - LHR
1 stop12h 45mDelta
Wed 12/36:30 amLHR - GEG
2 stops21h 40mDelta
Deal found 11/1$592
This Delta deal was found by Cheapflights users on 11/2. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/57:15 amGEG - LHR
2 stops15h 50mDelta
Wed 11/196:20 amLHR - GEG
2 stops20h 13mDelta
Deal found 11/2$594
This KLM deal was found by Cheapflights users on 11/2. 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 11/121:16 pmGEG - LHR
1 stop14h 24mKLM
Wed 12/310:45 amLHR - GEG
1 stop15h 52mKLM
Deal found 11/2$597
This Virgin Atlantic deal was found by Cheapflights users on 11/1. 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 Virgin Atlantic is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/105:35 amBOI - LHR
2 stops17h 45mVirgin Atlantic
Wed 12/179:40 amLHR - BOI
2 stops21h 29mVirgin Atlantic
Deal found 11/1$602
This KLM deal was found by Cheapflights users on 11/2. 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.
Sun 12/711:44 amBOI - LHR
1 stop15h 46mKLM
Sun 12/1411:20 amLHR - BOI
1 stop17h 45mKLM
Deal found 11/2$622
This KLM deal was found by Cheapflights users on 11/2. 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.
Sun 12/71:12 pmGEG - LHR
1 stop14h 28mKLM
Sun 12/1410:45 amLHR - GEG
1 stop15h 52mKLM
Deal found 11/2$622
This Delta deal was found by Cheapflights users on 11/2. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/79:00 amBOI - LHR
2 stops18h 15mDelta
Sun 12/141:00 pmLHR - BOI
2 stops18h 09mDelta
Deal found 11/2$627
This KLM deal was found by Cheapflights users on 11/2. 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.
Sun 12/76:00 amGEG - LHR
2 stops16h 50mMultiple Airlines
Sun 12/1410:45 amLHR - GEG
1 stop15h 52mMultiple Airlines
Deal found 11/2$627
This KLM deal was found by Cheapflights users on 11/1. 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 11/71:00 pmJAC - LHR
1 stop14h 00mMultiple Airlines
Fri 11/146:20 amLHR - JAC
2 stops17h 50mMultiple Airlines
Deal found 11/1$640
This Delta deal was found by Cheapflights users on 11/2. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/139:00 amBOI - LHR
1 stop20h 50mDelta
Wed 11/198:55 amLHR - BOI
2 stops20h 44mDelta
Deal found 11/2$640

Cheap flight deals from Idaho to Heathrow

Keep the following information in mind while searching for Idaho to Heathrow flight deals. Data was last updated November 3, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$566
(Netflights)

One-way from

$340
(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 ($279 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 5% potential price decrease ($48 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in November 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 November 3, 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

BoiseLondon

BOI - LHR

BOILHR

Boise Air Term. Gowen Fld

Tue 2/17

1:46 pm-12:50 pm

1 stop16h 04m

London Heathrow

Thu 2/26

11:05 am-8:57 pm

1 stop16h 52m

$566

BoiseLondon

BOI - LHR

BOILHR

Boise Air Term. Gowen Fld

Tue 2/17

1:00 pm-10:00 am

1 stop14h 00m

London Heathrow

Thu 2/26

6:20 am-4:05 pm

2 stops16h 45m

$588

SpokaneLondon

GEG - LHR

GEGLHR

Spokane

Wed 11/12

9:20 am-10:30 am

1 stop17h 10m

London Heathrow

Wed 12/3

6:20 am-6:56 pm

2 stops20h 36m

$590

SpokaneLondon

GEG - LHR

GEGLHR

Spokane

Wed 12/31

11:21 am-10:30 am

1 stop15h 09m

London Heathrow

Wed 1/14

6:20 am-6:47 pm

2 stops20h 27m

$590

SpokaneLondon

GEG - LHR

GEGLHR

Spokane

Wed 12/31

12:02 pm-11:40 am

1 stop15h 38m

London Heathrow

Wed 1/14

12:20 pm-6:47 pm

1 stop14h 27m

$597

SpokaneLondon

GEG - LHR

GEGLHR

Spokane

Wed 11/12

11:19 am-10:30 am

1 stop15h 11m

London Heathrow

Wed 12/3

12:20 pm-6:56 pm

1 stop14h 36m

$597

SpokaneLondon

GEG - LHR

GEGLHR

Spokane

Wed 11/12

1:15 pm-10:00 am

1 stop12h 45m

London Heathrow

Tue 11/25

11:05 am-8:03 pm

1 stop16h 58m

$597

BoiseLondon

BOI - LHR

BOILHR

Boise Air Term. Gowen Fld

Tue 2/17

1:46 pm-12:50 pm

1 stop16h 04m

London Heathrow

Tue 2/24

6:20 am-6:28 pm

2 stops19h 08m

$598

BoiseLondon

BOI - LHR

BOILHR

Boise Air Term. Gowen Fld

Tue 2/17

7:15 am-10:55 am

1 stop20h 40m

London Heathrow

Fri 2/27

6:20 am-9:58 pm

2 stops22h 38m

$598

BoiseLondon

BOI - LHR

BOILHR

Boise Air Term. Gowen Fld

Wed 12/10

5:35 am-6:20 am

2 stops17h 45m

London Heathrow

Wed 12/17

9:40 am-12:09 am

2 stops21h 29m

$602

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/2

Showing 1-10 of 41 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 $611). 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 November 3, 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 Virgin Atlantic, Delta, and United Airlines fly from Idaho to London Heathrow Airport in about 15h 46m. The time it takes to get you to your destination can typically vary by up to 1h 24m. Idaho and London Heathrow Airport are separated by a distance of 4658 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

  • What are the cheapest airlines to fly from Idaho to London Heathrow Airport one-way?

    $393 is the cheapest one-way deal found within the past few days, from United Airlines. You may also be able to find cheap deals on Air Canada and Lufthansa, with prices starting from $394 and $397, respectively.

  • 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 $611). 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
Hounslow
Ilford
Hayes
Southend-on-Sea
Harrow
Croydon
Eastleigh
Dartford
Dover
Winchester
Orpington
Northampton
Gatwick
Borehamwood
Broadway
Aylesbury
Bedford
Chipping Norton
Wembley
Folkestone

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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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 November 3, 2025.
AirlineCheapestAverageFlexibilityOn-time
KLMCheapest$577Average$774FlexibilityNo cancel feeOn-time75%
United AirlinesCheapest$639Average$968FlexibilityNo cancel feeOn-time69%
Virgin AtlanticCheapest$695Average$881FlexibilityNo cancel feeOn-time72%
DeltaCheapest$701Average$1,035FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$703Average$873FlexibilityNo cancel feeOn-time71%

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