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$451+ 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 7/21. Fares are subject to change and may not be available on all flights or dates of travel.
BOI — LHR
Apr 6 — Apr 131
Sun 4/6
Sun 4/13
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 April 1, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$686
(FlightHub)

One-way from

$451
(Delta)

Popular in

June

Cheapest in

November

Average price

$799
Provider with most accurate pricing for Boise Air Term. Gowen Fld-London (LON) flight deals.
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Provider most trusted by Cheapflights users for Boise Air Term. Gowen Fld-London (LON) flights.
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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. 28% potential increase in price ($369 potential increase over avg. RT price).
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Cheapest flight prices on average. 5% potential price decrease ($49 potential savings vs. average RT price).
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Average for round-trip flights in April 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 April 1, 2025.

This StudentUniverse deal was found by Cheapflights users on 3/31. 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 StudentUniverse is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/67:30 amBOI - LHR
1 stop22h 00mFinnair
Mon 10/134:10 pmLHR - BOI
2 stops36h 02mFinnair
Deal found 3/31$669
This FlightHub deal was found by Cheapflights users on 4/1. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/33:43 pmBOI - LHR
2 stops19h 47mScandinavian Airlines
Tue 9/166:40 amLHR - BOI
2 stops23h 40mScandinavian Airlines
Deal found 4/1$686
This Delta deal was found by Cheapflights users on 4/1. 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 4/301:25 pmGEG - LHR
1 stop13h 55mDelta
Thu 5/156:30 amLHR - GEG
2 stops18h 30mDelta
Deal found 4/1$693
This American Airlines deal was found by Cheapflights users on 3/31. 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.
Tue 9/237:30 amBOI - LHR
1 stop15h 55mAmerican Airlines
Wed 10/18:20 amLHR - BOI
1 stop19h 54mAmerican Airlines
Deal found 3/31$707
This Virgin Atlantic deal was found by Cheapflights users on 4/1. 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 5/712:30 pmIDA - LHR
2 stops21h 45mVirgin Atlantic
Wed 5/2111:45 amLHR - IDA
2 stops18h 06mVirgin Atlantic
Deal found 4/1$712
This United Airlines deal was found by Cheapflights users on 4/1. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/263:25 pmGEG - LHR
1 stop35h 00mUnited Airlines
Thu 5/154:15 pmLHR - GEG
1 stop15h 23mUnited Airlines
Deal found 4/1$713
This American Airlines deal was found by Cheapflights users on 3/31. 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.
Wed 7/301:39 pmGEG - LHR
1 stop14h 36mAmerican Airlines
Wed 8/133:40 pmLHR - GEG
1 stop15h 15mAmerican Airlines
Deal found 3/31$715
This Delta deal was found by Cheapflights users on 3/31. 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 8/2010:38 amBOI - LHR
1 stop17h 42mDelta
Fri 9/511:45 amLHR - BOI
2 stops18h 44mDelta
Deal found 3/31$726
This American Airlines deal was found by Cheapflights users on 3/31. 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.
Wed 12/315:54 amGEG - LHR
1 stop16h 26mMultiple Airlines
Wed 1/1410:40 amLHR - GEG
1 stop18h 05mMultiple Airlines
Deal found 3/31$745
This Justfly.com deal was found by Cheapflights users on 3/31. 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 Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/65:22 pmBOI - LHR
2 stops32h 13mAir Canada
Mon 10/139:30 amLHR - BOI
2 stops42h 46mAir Canada
Deal found 3/31$746
This American Airlines deal was found by Cheapflights users on 3/31. 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.
Tue 5/137:00 amIDA - LHR
2 stops16h 20mAmerican Airlines
Tue 5/209:15 amLHR - IDA
2 stops19h 02mAmerican Airlines
Deal found 3/31$750
This United Airlines deal was found by Cheapflights users on 3/31. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/212:20 pmIDA - LHR
1 stop15h 00mUnited Airlines
Tue 5/69:00 amLHR - IDA
2 stops31h 32mUnited Airlines
Deal found 3/31$762

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 April 1, 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

Wed 9/3

3:43 pm-6:30 pm

2 stops19h 47m

London Heathrow

Tue 9/16

6:40 am-11:20 pm

2 stops23h 40m

$686

SpokaneLondon

GEG - LHR

GEGLHR

Spokane

Wed 4/30

1:25 pm-11:20 am

1 stop13h 55m

London Heathrow

Thu 5/15

6:30 am-5:00 pm

2 stops18h 30m

$693

BoiseLondon

BOI - LHR

BOILHR

Boise Air Term. Gowen Fld

Wed 9/3

1:41 pm-12:30 pm

1 stop15h 49m

London Heathrow

Tue 9/16

10:30 am-9:14 pm

1 stop17h 44m

$705

BoiseLondon

BOI - LHR

BOILHR

Boise Air Term. Gowen Fld

Tue 9/23

7:30 am-6:25 am

1 stop15h 55m

London Heathrow

Wed 10/1

8:20 am-9:14 pm

1 stop19h 54m

$707

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Wed 5/7

12:30 pm-5:15 pm

2 stops21h 45m

London Heathrow

Wed 5/21

11:45 am-10:51 pm

2 stops18h 06m

$712

SpokaneLondon

GEG - LHR

GEGLHR

Spokane

Sat 4/26

3:25 pm-10:25 am

1 stop35h 00m

London Heathrow

Thu 5/15

4:15 pm-11:38 pm

1 stop15h 23m

$713

BoiseLondon

BOI - LHR

BOILHR

Boise Air Term. Gowen Fld

Wed 8/20

10:38 am-11:20 am

1 stop17h 42m

London Heathrow

Fri 9/5

11:45 am-11:29 pm

2 stops18h 44m

$726

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Tue 5/13

7:00 am-6:20 am

2 stops16h 20m

London Heathrow

Tue 5/20

9:15 am-9:17 pm

2 stops19h 02m

$750

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Mon 4/21

2:20 pm-12:20 pm

1 stop15h 00m

London Heathrow

Tue 5/6

9:00 am-9:32 am

2 stops31h 32m

$762

SpokaneLondon

GEG - LHR

GEGLHR

Spokane

Wed 4/9

5:34 am-6:25 am

1 stop16h 51m

London Heathrow

Sat 4/26

11:15 am-10:59 pm

1 stop19h 44m

$765

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/31

Showing 1-10 of 40 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 $1,110). 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 April 1, 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.

Rainfall in Heathrow by month

Plan your trip to Heathrow by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in London Heathrow Airport ranges from 1.6 - 2.8 inches per month. January is typically the wettest month, when rainfall can reach 2.8 in. July is typically the driest time to visit London Heathrow Airport when rainfall is around 1.6 in.

Temperature in Heathrow by month

Plan your trip to Heathrow by taking into account the average temperature totals by month.

If weather is an important factor for your trip to London Heathrow Airport, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 62.6 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 39.2 F).

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 April 1, 2025.
Peruse reviews from past customers who have flown with Delta, KLM and Finnair from Idaho to London to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very good
7,898 reviews

Crew

8.5

Food

7.3

Entertainment

7.9

Comfort

7.9

Boarding

8.2

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
Delta
8.0
Very good
7,898 reviews
Delta
8.0
Very good
7,898 reviews

Crew

8.5

Food

7.3

Entertainment

7.9

Comfort

7.9

Boarding

8.2

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
KLM
7.8
Good
1,323 reviews
Delta
8.0
Very good
7,898 reviews

Crew

8.5

Food

7.3

Entertainment

7.9

Comfort

7.9

Boarding

8.2

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
Finnair
7.6
Good
1,267 reviews
Delta
8.0
Very good
7,898 reviews

Crew

8.5

Food

7.3

Entertainment

7.9

Comfort

7.9

Boarding

8.2

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
Air France
7.4
Good
1,425 reviews
Delta
8.0
Very good
7,898 reviews

Crew

8.5

Food

7.3

Entertainment

7.9

Comfort

7.9

Boarding

8.2

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
United Airlines
7.4
Good
8,615 reviews
Delta
8.0
Very good
7,898 reviews

Crew

8.5

Food

7.3

Entertainment

7.9

Comfort

7.9

Boarding

8.2

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

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?

    $451 is the cheapest one-way deal found within the past few days, from Delta. You may also be able to find cheap deals on Scandinavian Airlines and KLM, with prices starting from $459 and $564, respectively.

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

    Most travelers choose Boise Air Term. Gowen Fld - London Heathrow, Spokane - 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, 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 $1,110). 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 Idaho?

Book flights to Idaho if you plan to visit one of these locations
Hounslow
Hayes
Thornton Heath
Luton
Wembley
Harrow
Horley
Canterbury
Dover
Gatwick
Orpington
Watford
Milton Keynes
Northampton
Stratford-upon-Avon
Croydon
Borehamwood
Folkestone
Ilford
Broadway

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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 4 airlines flying from Idaho to Heathrow

Discover the top 4 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 April 1, 2025.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$648Average$858FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$687Average$1,206FlexibilityNo cancel feeOn-time69%
Virgin AtlanticCheapest$695Average$885FlexibilityNo cancel feeOn-time72%
DeltaCheapest$727Average$1,137FlexibilityNo cancel feeOn-timeN/A

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