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Cheap flights from London Heathrow Airport to Idaho from £349

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 18/9. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — BOI
9 Jul — 16 Jul1
1 adult

Cheap flight deals from Heathrow to Idaho

Keep the following information in mind while searching for Heathrow to Idaho flight deals. Data was last updated 4 July 2025.

Round-trip from

£517

One-way from

£349

Popular in

August

Cheapest in

November

Average price

£862
United Airlines
  • United Airlines
  • 24/9-28/9
  • 4 total stops
  • 58h 45m total
  • London to Idaho
Search Deals
18/9
  • 18/9
  • 2 total stops
  • 53h 34m total
  • London to Idaho
Search Deals
Highest demand for flights based on searches. 15% potential increase in price (£89 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease (£17 potential savings vs. average return price).
Search Deals
Average for round-trip flights in July 2025
Search Deals

Find flight deals from Heathrow to Idaho

Cheapest flights from Heathrow to Idaho
Explore the most affordable flight options available from Heathrow to Idaho. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 4 July 2025.

Wed 24/913:45LHR - GEG
2 stops41h 30mUnited Airlines
Sun 28/905:15GEG - LHR
2 stops17h 15mUnited Airlines
Deal found 30/6£517
Wed 24/908:25LHR - GEG
2 stops18h 52mAmerican Airlines
Sun 28/913:30GEG - LHR
1 stop35h 40mAmerican Airlines
Deal found 2/7£519
Wed 24/914:50LHR - GEG
1 stop14h 13mLufthansa
Sun 28/912:35GEG - LHR
1 stop13h 50mLufthansa
Deal found 2/7£542
Sun 7/912:05LHR - BOI
2 stops17h 36mUnited Airlines
Sat 20/907:00BOI - LHR
2 stops16h 45mUnited Airlines
Deal found 2/7£618
Fri 5/914:50LHR - BOI
1 stop13h 25mLufthansa
Sat 20/912:27BOI - LHR
1 stop12h 53mLufthansa
Deal found 2/7£621
Mon 1/906:30LHR - SUN
2 stops22h 26mDelta
Wed 10/915:15SUN - LHR
2 stops21h 45mDelta
Deal found 2/7£625
Fri 21/1118:00LHR - BOI
2 stops24h 39mMultiple Airlines
Sun 30/1106:15BOI - LHR
2 stops17h 15mMultiple Airlines
Deal found 3/7£628
Sat 30/808:40LHR - SUN
2 stops44h 16mVirgin Atlantic
Tue 9/912:37SUN - LHR
2 stops15h 23mVirgin Atlantic
Deal found 2/7£628
Fri 5/906:10LHR - BOI
2 stops22h 38mAmerican Airlines
Sun 21/913:07BOI - LHR
2 stops33h 43mAmerican Airlines
Deal found 2/7£641
Sat 22/1111:55LHR - IDA
1 stop31h 24mAmerican Airlines
Wed 26/1113:50IDA - LHR
1 stop15h 25mAmerican Airlines
Deal found 3/7£647
Sun 17/812:00LHR - GEG
1 stop18h 36mIberia
Sun 24/812:27GEG - LHR
1 stop33h 58mIberia
Deal found 3/7£648
Sat 22/1106:20LHR - IDA
2 stops18h 54mDelta
Wed 26/1106:05IDA - LHR
2 stops21h 10mDelta
Deal found 1/7£659

Cheapflights Fare Finder

Customise your flight search to find flights from Heathrow to Idaho 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 4 July 2025.
Use the filters below to find and compare flights from London Heathrow Airport to Idaho that are best for you.

Fly from

Heathrow

Fly to

Idaho

Route

Depart

Return

Price

LondonSpokane

LHR - GEG

LHRGEG

London Heathrow

Wed 24/9

13:45-23:15

2 stops41h 30m

Spokane

Sun 28/9

12:35-07:25

1 stop34h 50m

£517

LondonSpokane

LHR - GEG

LHRGEG

London Heathrow

Wed 24/9

08:25-19:17

2 stops18h 52m

Spokane

Sun 28/9

13:30-09:10

1 stop35h 40m

£519

LondonSpokane

LHR - GEG

LHRGEG

London Heathrow

Wed 24/9

14:50-21:03

1 stop14h 13m

Spokane

Sun 28/9

12:35-10:25

1 stop13h 50m

£542

LondonBoise

LHR - BOI

LHRBOI

London Heathrow

Sun 7/9

12:05-22:41

2 stops17h 36m

Boise Air Term. Gowen Fld

Sat 20/9

07:45-07:25

1 stop16h 40m

£618

LondonHailey

LHR - SUN

LHRSUN

London Heathrow

Mon 1/9

06:30-21:56

2 stops22h 26m

Hailey Sun Valley-Friedman

Wed 10/9

15:15-20:00

2 stops21h 45m

£625

LondonBoise

LHR - BOI

LHRBOI

London Heathrow

Fri 21/11

18:00-11:39

2 stops24h 39m

Boise Air Term. Gowen Fld

Sun 30/11

06:15-06:30

2 stops17h 15m

£628

LondonHailey

LHR - SUN

LHRSUN

London Heathrow

Sat 30/8

08:40-21:56

2 stops44h 16m

Hailey Sun Valley-Friedman

Tue 9/9

12:37-11:00

2 stops15h 23m

£628

LondonBoise

LHR - BOI

LHRBOI

London Heathrow

Fri 24/10

08:30-21:24

2 stops19h 54m

Boise Air Term. Gowen Fld

Mon 3/11

14:31-20:35

2 stops23h 04m

£639

LondonBoise

LHR - BOI

LHRBOI

London Heathrow

Fri 5/9

06:10-21:48

2 stops22h 38m

Boise Air Term. Gowen Fld

Sun 21/9

13:07-05:50

2 stops33h 43m

£641

LondonIdaho Falls

LHR - IDA

LHRIDA

London Heathrow

Sat 22/11

15:45-12:19

2 stops27h 34m

Idaho Falls Fanning Field

Wed 26/11

13:50-12:15

1 stop15h 25m

£647

Flights are sorted by cheapest return flights first.

Deals found on 3/7

Showing 1-10 of 47 results
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Best time to book a flight from Heathrow to Idaho

Have a flexible travel schedule? Discover the best time to fly to Idaho from Heathrow 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 London Heathrow Airport to Idaho

What is the cheapest month to book a flight from London Heathrow Airport to Idaho?

Currently, October is the cheapest month in which you can book a flight from London Heathrow Airport to Idaho (average of £754). Flying from London Heathrow Airport to Idaho in August is currently the most expensive (average of £1,152). 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 LHR to ID?

Find hourly flight availability from Heathrow to Idaho. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 4 July 2025.

When flying from London Heathrow Airport to Idaho, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

How much does it cost for a return flight from London Heathrow Airport to Idaho?

Reviews of airlines servicing Idaho

Get insights into the airlines that provide service to Idaho. 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 Idaho. Reviews last updated 4 July 2025.
See what other customers who have flown with Delta, Alaska Airlines, andKLM from London Heathrow Airport to Idaho have to say. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very Good
7,970 reviews
Check prices

Entertainment

7.9

Overall

8.0

Comfort

7.9

Crew

8.5

Boarding

8.2

Food

7.3

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
7,970 reviews
Delta
8.0
Very Good
7,970 reviews
Check prices

Entertainment

7.9

Overall

8.0

Comfort

7.9

Crew

8.5

Boarding

8.2

Food

7.3

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
7,970 reviews
Check prices

Entertainment

7.9

Overall

8.0

Comfort

7.9

Crew

8.5

Boarding

8.2

Food

7.3

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
1,363 reviews
Delta
8.0
Very Good
7,970 reviews
Check prices

Entertainment

7.9

Overall

8.0

Comfort

7.9

Crew

8.5

Boarding

8.2

Food

7.3

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
1,304 reviews
Delta
8.0
Very Good
7,970 reviews
Check prices

Entertainment

7.9

Overall

8.0

Comfort

7.9

Crew

8.5

Boarding

8.2

Food

7.3

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!
Air France
7.5
Good
1,473 reviews
Delta
8.0
Very Good
7,970 reviews
Check prices

Entertainment

7.9

Overall

8.0

Comfort

7.9

Crew

8.5

Boarding

8.2

Food

7.3

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 Heathrow to Idaho. 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 London Heathrow Airport to Idaho one-way?

    For one-way options, check prices for Lufthansa. According to our data, you can fly for as low as £568. Users have also found prices from £785 and £840 on Finnair and Icelandair, respectively.

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

    While some choose either London Heathrow - Boise Air Term. Gowen Fld or London Heathrow - Jackson Hole, London Heathrow - Spokane is the most popular route from London Heathrow Airport to Idaho.

  • Can I find deals for flights from Heathrow to Idaho that include hotel bookings?

    Yes. In addition to deals on Heathrow to Idaho flights, Cheapflights offers holiday packages that include both flights and hotel.

  • How can I find direct flights from Heathrow to Idaho?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Heathrow to Idaho.

  • Can I find deals for business class flights from Heathrow to Idaho?

    Yes. Cheapflights offers flight deals from Heathrow to Idaho 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 London Heathrow Airport to Idaho?

    Currently, October is the cheapest month in which you can book a flight from London Heathrow Airport to Idaho (average of £754). Flying from London Heathrow Airport to Idaho in August is currently the most expensive (average of £1,152). 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

Browse thousands of different options on Cheapflights for your next trip

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Alternative routes for Heathrow to Idaho

See prices for flight routes from nearby airports that may be better suited for you.
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Top 6 airlines flying from Heathrow to Idaho

Discover the top 6 airlines that operate flights from Heathrow to Idaho. 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 858,174 searches. Data last updated 4 July 2025.
AirlineCheapestAverageFlexibilityOn-time
FinnairCheapest£509Average£637FlexibilityNo cancel feeOn-time76%
Search Finnair flights
KLMCheapest£522Average£635FlexibilityNo cancel feeOn-time75%
Search KLM flights
United AirlinesCheapest£526Average£810FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
LufthansaCheapest£527Average£575FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
Virgin AtlanticCheapest£593Average£844FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
British AirwaysCheapest£658Average£843FlexibilityNo cancel feeOn-time70%
Search British Airways flights

Fly with Cheapflights

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How does Cheapflights help users find flights from Heathrow to Idaho?

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Why should you use Cheapflights to find cheap flight tickets from Heathrow to Idaho?

It’s simple! Cheapflights, which is free to use for everyone, saves millions of users time and money every year by helping them find the cheapest and most suitable flights from Heathrow to Idaho.

Can Cheapflights find flights from Heathrow to Idaho with no change fees?

Certainly. Search results for flights to Idaho from Heathrow shown to you on Cheapflights can be narrowed down with different useful search filters, which includes flexible booking options.

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Yes, and it’s super simple to set up. Click the bell icon next to the flight deals above and provide a valid email address to enable Price Alerts. That’s it!

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