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Heathrow

$275+ 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 10/4. Fares are subject to change and may not be available on all flights or dates of travel.
BOI — LHR
Aug 5 — Aug 121
Tue 8/5
Tue 8/12
1 adult, Economy
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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 July 31, 2025.

Round-trip from

$606
(FlightHub)

One-way from

$275
(Kiwi.com)

Popular in

June

Cheapest in

October

Average price

$1,232
From Idaho to London Heathrow
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One-way flight from Idaho to London Heathrow
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Highest demand for flights based on searches. 24% potential increase in price ($291 potential increase over avg. RT price).
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Cheapest flight prices on average. 5% potential price decrease ($48 potential savings vs. average RT price).
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Average for round-trip flights in July 2025
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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 July 31, 2025.

This FlightHub deal was found by Cheapflights users on 7/30. 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.
Mon 11/1710:40 amBOI - LHR
2 stops42h 10mAir Canada
Tue 12/92:30 pmLHR - BOI
2 stops40h 14mAir Canada
Deal found 7/30$606
This KLM deal was found by Cheapflights users on 7/30. 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 8/242:21 pmGEG - LHR
1 stop14h 49mKLM
Tue 9/96:30 amLHR - GEG
2 stops16h 15mKLM
Deal found 7/30$609
This United Airlines deal was found by Cheapflights users on 7/30. 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.
Tue 10/142:39 pmBOI - LHR
1 stop14h 41mUnited Airlines
Fri 10/244:00 pmLHR - BOI
2 stops28h 33mUnited Airlines
Deal found 7/30$613
This Delta deal was found by Cheapflights users on 7/31. 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 10/111:29 amGEG - LHR
1 stop18h 46mDelta
Tue 10/79:00 amLHR - GEG
2 stops20h 05mDelta
Deal found 7/31$620
This Delta deal was found by Cheapflights users on 7/30. 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.
Tue 9/233:20 pmBOI - LHR
1 stop14h 50mDelta
Wed 10/111:30 amLHR - BOI
2 stops19h 27mDelta
Deal found 7/30$621
This United Airlines deal was found by Cheapflights users on 7/30. 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.
Mon 9/15:15 amGEG - LHR
1 stop20h 25mUnited Airlines
Fri 9/122:05 pmLHR - GEG
2 stops29h 22mUnited Airlines
Deal found 7/30$627
This Finnair deal was found by Cheapflights users on 7/30. 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 Finnair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/237:00 amBOI - LHR
1 stop16h 25mFinnair
Wed 10/110:30 amLHR - BOI
1 stop18h 18mFinnair
Deal found 7/30$629
This Delta deal was found by Cheapflights users on 7/30. 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.
Tue 9/231:06 pmIDA - LHR
2 stops17h 04mDelta
Tue 9/309:35 amLHR - IDA
2 stops19h 50mDelta
Deal found 7/30$633
This American Airlines deal was found by Cheapflights users on 7/31. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/211:50 pmBOI - LHR
1 stop16h 00mAmerican Airlines
Wed 9/38:25 amLHR - BOI
2 stops20h 23mAmerican Airlines
Deal found 7/31$636
This United Airlines deal was found by Cheapflights users on 7/30. 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.
Tue 9/237:00 amIDA - LHR
2 stops19h 35mUnited Airlines
Tue 9/3011:25 amLHR - IDA
1 stop16h 27mUnited Airlines
Deal found 7/30$650
This Booking.com deal was found by Cheapflights users on 7/29. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/157:00 pmBOI - LHR
2 stops28h 30mMultiple Airlines
Sat 12/67:40 amLHR - BOI
2 stops19h 03mMultiple Airlines
Deal found 7/29$662
This KLM deal was found by Cheapflights users on 7/31. 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.
Thu 11/2712:40 pmGEG - LHR
1 stop15h 00mMultiple Airlines
Thu 12/46:20 amLHR - GEG
2 stops17h 47mMultiple Airlines
Deal found 7/31$670

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 July 31, 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

Sun 8/24

2:21 pm-1:10 pm

1 stop14h 49m

London Heathrow

Tue 9/9

6:30 am-2:45 pm

2 stops16h 15m

$609

BoiseLondon

BOI - LHR

BOILHR

Boise Air Term. Gowen Fld

Tue 10/14

2:39 pm-12:20 pm

1 stop14h 41m

London Heathrow

Fri 10/24

4:00 pm-1:33 pm

2 stops28h 33m

$613

SpokaneLondon

GEG - LHR

GEGLHR

Spokane

Wed 10/1

11:29 am-2:15 pm

1 stop18h 46m

London Heathrow

Tue 10/7

9:00 am-9:05 pm

2 stops20h 05m

$620

BoiseLondon

BOI - LHR

BOILHR

Boise Air Term. Gowen Fld

Tue 9/23

3:20 pm-1:10 pm

1 stop14h 50m

London Heathrow

Wed 10/1

11:30 am-11:57 pm

2 stops19h 27m

$621

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Tue 1/20

1:05 pm-10:00 am

1 stop13h 55m

London Heathrow

Fri 1/30

6:20 am-6:15 pm

2 stops18h 55m

$622

LewistonLondon

LWS - LHR

LWSLHR

Lewiston Nez Perce Rgnl

Mon 1/5

7:05 am-11:00 am

1 stop19h 55m

London Heathrow

Tue 3/10

8:25 pm-9:02 pm

2 stops31h 37m

$622

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Tue 1/20

6:45 pm-6:20 am

2 stops28h 35m

London Heathrow

Fri 1/30

6:20 am-10:21 pm

2 stops23h 01m

$626

BoiseLondon

BOI - LHR

BOILHR

Boise Air Term. Gowen Fld

Tue 9/23

9:52 am-9:35 am

2 stops16h 43m

London Heathrow

Wed 10/1

8:30 am-10:30 pm

2 stops21h 00m

$627

SpokaneLondon

GEG - LHR

GEGLHR

Spokane

Mon 9/1

5:15 am-9:40 am

1 stop20h 25m

London Heathrow

Fri 9/12

2:05 pm-11:27 am

2 stops29h 22m

$627

BoiseLondon

BOI - LHR

BOILHR

Boise Air Term. Gowen Fld

Tue 9/23

7:00 am-6:25 am

1 stop16h 25m

London Heathrow

Wed 10/1

10:30 am-9:48 pm

1 stop18h 18m

$629

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/31

Showing 1-10 of 46 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, November is the cheapest month in which you can book a flight from Idaho to London Heathrow Airport (average of $661). Flying from Idaho to London Heathrow Airport in June is currently the most expensive (average of $1,097). 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 July 31, 2025.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Idaho to London Heathrow Airport as you normally would.

How much does it cost to fly round-trip from Idaho to London Heathrow Airport?

Reviews of airlines servicing Heathrow

Get insights into the airlines that provide service to Heathrow. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Heathrow. Reviews last updated July 31, 2025.
Peruse reviews from past customers who have flown with Delta, Alaska Airlines, and KLM from Idaho to London Heathrow Airport to help guide your decision. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very good
7,981 reviews

Overall

8.0

Boarding

8.2

Food

7.3

Entertainment

7.9

Comfort

7.9

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Delta
8.0
Very good
7,981 reviews
Delta
8.0
Very good
7,981 reviews

Overall

8.0

Boarding

8.2

Food

7.3

Entertainment

7.9

Comfort

7.9

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Alaska Airlines
8.0
Very good
10,000 reviews
Delta
8.0
Very good
7,981 reviews

Overall

8.0

Boarding

8.2

Food

7.3

Entertainment

7.9

Comfort

7.9

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
KLM
7.8
Good
1,383 reviews
Delta
8.0
Very good
7,981 reviews

Overall

8.0

Boarding

8.2

Food

7.3

Entertainment

7.9

Comfort

7.9

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Finnair
7.6
Good
1,316 reviews
Delta
8.0
Very good
7,981 reviews

Overall

8.0

Boarding

8.2

Food

7.3

Entertainment

7.9

Comfort

7.9

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
United Airlines
7.4
Good
8,900 reviews
Delta
8.0
Very good
7,981 reviews

Overall

8.0

Boarding

8.2

Food

7.3

Entertainment

7.9

Comfort

7.9

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

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.

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

    $394 is the cheapest one-way deal found within the past few days, from Air Canada. You may also be able to find cheap deals on United Airlines and KLM, with prices starting from $405 and $463, respectively.

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

    Most travelers choose Boise Air Term. Gowen Fld - London Heathrow, Lewiston Nez Perce Rgnl - London Heathrow or Spokane - 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, November is the cheapest month in which you can book a flight from Idaho to London Heathrow Airport (average of $661). Flying from Idaho to London Heathrow Airport in June is currently the most expensive (average of $1,097). 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
Hayes
Thornton Heath
Harrow
Canterbury
Dover
Stratford-upon-Avon
Orpington
Watford
Northampton
Gatwick
Borehamwood
Dartford
Broadway
Aylesbury
Chelmsford
Folkestone
Southend-on-Sea
Chichester
Swindon

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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 Gatwick flights
Boston to London City flights
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O'Hare Intl to London City flights
Dulles Intl to London City flights
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Los Angeles to London City flights
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San Francisco to Gatwick flights
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San Francisco to London City flights
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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 July 31, 2025.
AirlineCheapestAverageFlexibilityOn-time
KLMCheapest$555Average$774FlexibilityNo cancel feeOn-time75%
Virgin AtlanticCheapest$644Average$940FlexibilityNo cancel feeOn-time72%
United AirlinesCheapest$679Average$980FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$703Average$865FlexibilityNo cancel feeOn-time71%
DeltaCheapest$727Average$1,084FlexibilityNo cancel feeOn-timeN/A

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