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Cheap flights from London Heathrow Airport to Idaho from £368

LHR — BOI
28 Sep — 5 Oct1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Heathrow to Idaho

Enter your travel dates to find the best prices.

Cheapest flights from Heathrow to Idaho

Fri 25/906:40 -
2 stops22h 54m
Sat 3/1010:34 -
2 stops24h 06m
Deal found 25/8£593
Tue 13/1014:30 -
1 stop15h 27m
Tue 20/1007:20 -
1 stop19h 55m
Deal found 28/8£595
Tue 13/1014:30 -
1 stop17h 05m
Tue 20/1014:51 -
1 stop18h 44m
Deal found 29/8£613
Sat 3/1006:40 -
2 stops19h 00m
Sat 10/1012:08 -
2 stops26h 32m
Deal found 25/8£624
Thu 15/1017:00 -
1 stop13h 59m
Tue 27/1016:18 -
1 stop14h 02m
Deal found 28/8£638
Sun 11/1011:40 -
1 stop19h 19m
Sun 18/1016:18 -
1 stop16h 17m
Deal found 27/8£664
Tue 17/1106:35 -
2 stops20h 06m
Tue 24/1107:00 -
1 stop16h 25m
Deal found 26/8£666
Mon 16/1107:30 -
2 stops22h 21m
Mon 30/1114:51 -
1 stop11h 49m
Deal found 26/8£667
Fri 25/911:25 -
1 stop17h 10m
Sat 3/1008:08 -
1 stop17h 22m
Deal found 25/8£676
Thu 1/1013:00 -
1 stop17h 16m
Mon 19/1013:38 -
1 stop14h 47m
Deal found 26/8£689
Tue 8/914:50 -
1 stop14h 24m
Tue 6/1013:05 -
1 stop34h 20m
Deal found 25/8£690
Tue 8/911:25 -
1 stop17h 49m
Wed 16/913:09 -
1 stop14h 01m
Deal found 24/8£691

Find flight deals from Heathrow to Idaho

Round-trip from

£593

One-way from

£368

Popular in

December

Cheapest in

January

Average price

£1,095
Scandinavian Airlines
  • Scandinavian Airlines
  • 25/9-3/10
  • 4 total stops
  • 47h 00m total
  • London to Idaho
Search Deals
9/12
  • 9/12
  • 3 total stops
  • 49h 57m total
  • London to Idaho
Search Deals
High demand for flights, 1% potential price rise
Search Deals
Cheapest flight prices on average. 3% potential price decrease (£23 potential savings vs. average return price).
Search Deals
Average for round-trip flights in August 2026
Search Deals

Cheapflights Fare Finder

 
Use the filters below to find and compare flights from London Heathrow Airport to Idaho that are best for you.

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Route

Depart

Return

Price

Cheapest return flight

LondonBoise

LHR London Heathrow - BOI Boise Air Term. Gowen Fld

LHRBOI

London Heathrow

Sat 21/11

11:10-22:59

2 stops18h 49m

Boise Air Term. Gowen Fld

Sun 29/11

10:34-09:40

1 stop16h 06m

£685

LondonBoise

LHR London Heathrow - BOI Boise Air Term. Gowen Fld

LHRBOI

London Heathrow

Fri 20/11

09:30-21:15

2 stops18h 45m

Boise Air Term. Gowen Fld

Fri 27/11

06:30-05:55

2 stops16h 25m

£692

LondonBoise

LHR London Heathrow - BOI Boise Air Term. Gowen Fld

LHRBOI

London Heathrow

Fri 25/9

13:05-12:58

2 stops30h 53m

Boise Air Term. Gowen Fld

Sun 4/10

18:50-07:25

1 stop29h 35m

£699

LondonSpokane

LHR London Heathrow - GEG Spokane

LHRGEG

London Heathrow

Thu 14/1

11:35-11:24

2 stops31h 49m

Spokane

Mon 18/1

07:02-11:15

1 stop20h 13m

£706

LondonIdaho Falls

LHR London Heathrow - IDA Idaho Falls Fanning Field

LHRIDA

London Heathrow

Thu 28/1

14:45-15:21

1 stop31h 36m

Idaho Falls Fanning Field

Mon 1/2

13:56-12:20

1 stop15h 24m

£722

LondonSpokane

LHR London Heathrow - GEG Spokane

LHRGEG

London Heathrow

Tue 8/9

08:00-21:14

2 stops21h 14m

Spokane

Wed 16/9

13:37-20:40

2 stops23h 03m

£724

LondonHailey

LHR London Heathrow - SUN Hailey Sun Valley-Friedman

LHRSUN

London Heathrow

Thu 14/1

14:45-10:41

1 stop26h 56m

Hailey Sun Valley-Friedman

Mon 18/1

19:37-12:20

1 stop33h 43m

£725

LondonBoise

LHR London Heathrow - BOI Boise Air Term. Gowen Fld

LHRBOI

London Heathrow

Fri 9/10

11:25-17:43

1 stop13h 18m

Boise Air Term. Gowen Fld

Fri 16/10

17:30-17:05

2 stops16h 35m

£746

LondonBoise

LHR London Heathrow - BOI Boise Air Term. Gowen Fld

LHRBOI

London Heathrow

Thu 15/10

17:00-12:28

2 stops26h 28m

Boise Air Term. Gowen Fld

Tue 27/10

07:20-12:20

2 stops23h 00m

£750

LondonSpokane

LHR London Heathrow - GEG Spokane

LHRGEG

London Heathrow

Fri 11/12

10:25-21:09

2 stops18h 44m

Spokane

Sun 27/12

23:42-05:55

1 stop22h 13m

£769

Flights are sorted by cheapest return flights first.

Deals found on 26/8

Showing 1-10 of 58 resultsSorted by cheapest first
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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

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, March is the cheapest month in which you can book a flight from London Heathrow Airport to Idaho (average of £629). Flying from London Heathrow Airport to Idaho in August is currently the most expensive (average of £1,125). 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.

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

Airfare is below average for this route at the moment.
London Heathrow Airport to Idaho flights typically cost between £676 and £764 in September.
The cheapest return price found within the last 5 days was £593 on Scandinavian Airlines (25 Sept–3 Oct).

Reviews of airlines servicing Idaho

See what other customers who have flown with Alaska Airlines,United Airlines, andVirgin Atlantic 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.
Alaska Airlines
7.9
Good
12,859 reviews
Check prices

Entertainment

7.0

Food

7.0

Crew

8.5

Boarding

8.1

Comfort

7.8

Overall

7.9

Reviews

1 / 20
2.0
Mediocre

Chris,Aug 2026

GEG - SFO

Our flight was delayed multiple times over the course of the day for a total of almost ten hours. It was supposed to be a two-hour flight from San Francisco to Spokane. It turned into a nightmare of waiting all day in the airport, not knowing whether we would fly or not, whether we would miss my son's wedding and lose the expenses already incurred for car rental and accommodations. The Alaska staff seemed clueless and never gave us any convincing or definitive information. The airline offered food vouchers and discounts on future flights to make up for the trouble. However, the information about these concessions was not timely, nor were the vouchers themselves very useful. We were a family group of four people. The airline decided to give us one food voucher for $96, which is barely enough for four to get a sandwich and a drink each. Only by persistently addressing the airport food retailers were we able to get anything at all. Then, taking the exact opposite approach, the airline sent me, the original purchaser of all four tickets and the only email account they had, four vouchers for $150 each in the names of each of the four passengers. So, any one of us could get a discount on a future flight with Alaska in that amount. But I originally paid for all the tickets. It makes no sense, except to suggest that Alaska chooses the way to distribute vouchers that seems most likely to minimize the probability that they will be utilized. In my opinion, I should be offered a total refund for the ordeal we were forced to endure or at least a discount voucher for the entire $600.
Alaska Airlines
7.9
Good
12,859 reviews
Alaska Airlines
7.9
Good
12,859 reviews
Check prices

Entertainment

7.0

Food

7.0

Crew

8.5

Boarding

8.1

Comfort

7.8

Overall

7.9

Reviews

1 / 20
2.0
Mediocre

Chris,Aug 2026

GEG - SFO

Our flight was delayed multiple times over the course of the day for a total of almost ten hours. It was supposed to be a two-hour flight from San Francisco to Spokane. It turned into a nightmare of waiting all day in the airport, not knowing whether we would fly or not, whether we would miss my son's wedding and lose the expenses already incurred for car rental and accommodations. The Alaska staff seemed clueless and never gave us any convincing or definitive information. The airline offered food vouchers and discounts on future flights to make up for the trouble. However, the information about these concessions was not timely, nor were the vouchers themselves very useful. We were a family group of four people. The airline decided to give us one food voucher for $96, which is barely enough for four to get a sandwich and a drink each. Only by persistently addressing the airport food retailers were we able to get anything at all. Then, taking the exact opposite approach, the airline sent me, the original purchaser of all four tickets and the only email account they had, four vouchers for $150 each in the names of each of the four passengers. So, any one of us could get a discount on a future flight with Alaska in that amount. But I originally paid for all the tickets. It makes no sense, except to suggest that Alaska chooses the way to distribute vouchers that seems most likely to minimize the probability that they will be utilized. In my opinion, I should be offered a total refund for the ordeal we were forced to endure or at least a discount voucher for the entire $600.
United Airlines
7.4
Good
10,135 reviews
Alaska Airlines
7.9
Good
12,859 reviews
Check prices

Entertainment

7.0

Food

7.0

Crew

8.5

Boarding

8.1

Comfort

7.8

Overall

7.9

Reviews

1 / 20
2.0
Mediocre

Chris,Aug 2026

GEG - SFO

Our flight was delayed multiple times over the course of the day for a total of almost ten hours. It was supposed to be a two-hour flight from San Francisco to Spokane. It turned into a nightmare of waiting all day in the airport, not knowing whether we would fly or not, whether we would miss my son's wedding and lose the expenses already incurred for car rental and accommodations. The Alaska staff seemed clueless and never gave us any convincing or definitive information. The airline offered food vouchers and discounts on future flights to make up for the trouble. However, the information about these concessions was not timely, nor were the vouchers themselves very useful. We were a family group of four people. The airline decided to give us one food voucher for $96, which is barely enough for four to get a sandwich and a drink each. Only by persistently addressing the airport food retailers were we able to get anything at all. Then, taking the exact opposite approach, the airline sent me, the original purchaser of all four tickets and the only email account they had, four vouchers for $150 each in the names of each of the four passengers. So, any one of us could get a discount on a future flight with Alaska in that amount. But I originally paid for all the tickets. It makes no sense, except to suggest that Alaska chooses the way to distribute vouchers that seems most likely to minimize the probability that they will be utilized. In my opinion, I should be offered a total refund for the ordeal we were forced to endure or at least a discount voucher for the entire $600.
Virgin Atlantic
7.4
Good
695 reviews
Alaska Airlines
7.9
Good
12,859 reviews
Check prices

Entertainment

7.0

Food

7.0

Crew

8.5

Boarding

8.1

Comfort

7.8

Overall

7.9

Reviews

1 / 20
2.0
Mediocre

Chris,Aug 2026

GEG - SFO

Our flight was delayed multiple times over the course of the day for a total of almost ten hours. It was supposed to be a two-hour flight from San Francisco to Spokane. It turned into a nightmare of waiting all day in the airport, not knowing whether we would fly or not, whether we would miss my son's wedding and lose the expenses already incurred for car rental and accommodations. The Alaska staff seemed clueless and never gave us any convincing or definitive information. The airline offered food vouchers and discounts on future flights to make up for the trouble. However, the information about these concessions was not timely, nor were the vouchers themselves very useful. We were a family group of four people. The airline decided to give us one food voucher for $96, which is barely enough for four to get a sandwich and a drink each. Only by persistently addressing the airport food retailers were we able to get anything at all. Then, taking the exact opposite approach, the airline sent me, the original purchaser of all four tickets and the only email account they had, four vouchers for $150 each in the names of each of the four passengers. So, any one of us could get a discount on a future flight with Alaska in that amount. But I originally paid for all the tickets. It makes no sense, except to suggest that Alaska chooses the way to distribute vouchers that seems most likely to minimize the probability that they will be utilized. In my opinion, I should be offered a total refund for the ordeal we were forced to endure or at least a discount voucher for the entire $600.
Lufthansa
6.8
Okay
8,228 reviews
Alaska Airlines
7.9
Good
12,859 reviews
Check prices

Entertainment

7.0

Food

7.0

Crew

8.5

Boarding

8.1

Comfort

7.8

Overall

7.9

Reviews

1 / 20
2.0
Mediocre

Chris,Aug 2026

GEG - SFO

Our flight was delayed multiple times over the course of the day for a total of almost ten hours. It was supposed to be a two-hour flight from San Francisco to Spokane. It turned into a nightmare of waiting all day in the airport, not knowing whether we would fly or not, whether we would miss my son's wedding and lose the expenses already incurred for car rental and accommodations. The Alaska staff seemed clueless and never gave us any convincing or definitive information. The airline offered food vouchers and discounts on future flights to make up for the trouble. However, the information about these concessions was not timely, nor were the vouchers themselves very useful. We were a family group of four people. The airline decided to give us one food voucher for $96, which is barely enough for four to get a sandwich and a drink each. Only by persistently addressing the airport food retailers were we able to get anything at all. Then, taking the exact opposite approach, the airline sent me, the original purchaser of all four tickets and the only email account they had, four vouchers for $150 each in the names of each of the four passengers. So, any one of us could get a discount on a future flight with Alaska in that amount. But I originally paid for all the tickets. It makes no sense, except to suggest that Alaska chooses the way to distribute vouchers that seems most likely to minimize the probability that they will be utilized. In my opinion, I should be offered a total refund for the ordeal we were forced to endure or at least a discount voucher for the entire $600.

Related info for your journey

  • How long is the flight from London Heathrow Airport to Idaho?

    For as low as £746, United Airlines can have you in Idaho from London Heathrow Airport in 13h 18m. Airlines will cover a distance of 4829 mi. Both multi-stop and direct flights can be found to your destination and back.

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

    While some choose either London Heathrow - Spokane or London Heathrow - Boise Air Term. Gowen Fld, London Heathrow - Jackson Hole 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, March is the cheapest month in which you can book a flight from London Heathrow Airport to Idaho (average of £629). Flying from London Heathrow Airport to Idaho in August is currently the most expensive (average of £1,125). 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

Alternative routes for Heathrow to Idaho

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Top 4 airlines flying from Heathrow to Idaho

AirlineCheapestAverageFlexibilityOn-time
LufthansaCheapest£502Average£758FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
United AirlinesCheapest£519Average£914FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Virgin AtlanticCheapest£710Average£839FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
Alaska AirlinesCheapest£727Average£939FlexibilityNo cancel feeOn-time75%
Search Alaska Airlines flights

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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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