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Cheap flights from London to Idaho from £414

LON — BOI
31 Oct — 7 Nov1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from London to Idaho

Enter your travel dates to find the best prices.

Cheapest flights from London to Idaho

Thu 29/1014:45 -
1 stop15h 14m
Thu 5/1106:37 -
1 stop22h 43m
Deal found 29/9£635
Wed 11/1106:30 -
2 stops18h 33m
Wed 18/1113:53 -
1 stop13h 47m
Deal found 26/9£636
Mon 26/1006:30 -
2 stops21h 36m
Mon 2/1106:37 -
2 stops22h 13m
Deal found 25/9£637
Thu 29/1011:10 -
2 stops36h 53m
Thu 5/1106:30 -
2 stops21h 50m
Deal found 29/9£670
Thu 29/1006:30 -
2 stops17h 47m
Thu 5/1113:53 -
1 stop13h 47m
Deal found 29/9£670
Wed 4/1114:30 -
2 stops27h 49m
Thu 12/1112:31 -
1 stop12h 24m
Deal found 28/9£685
Mon 9/1107:50 -
2 stops22h 43m
Sun 17/106:25 -
2 stops31h 10m
Deal found 27/9£686
Wed 28/1015:00 -
2 stops37h 59m
Wed 4/1108:28 -
2 stops41h 52m
Deal found 28/9£688
Thu 29/1011:10 -
2 stops36h 53m
Wed 11/1105:00 -
2 stops20h 30m
Deal found 26/9£689
Mon 2/1106:20 -
2 stops19h 10m
Mon 16/1117:35 -
1 stop15h 55m
Deal found 27/9£691
Sat 12/1214:45 -
1 stop27h 24m
Tue 5/111:23 -
1 stop17h 57m
Deal found 29/9£693
Wed 4/1118:00 -
2 stops35h 51m
Thu 12/1105:00 -
2 stops23h 20m
Deal found 28/9£694

Find flight deals from London to Idaho

Round-trip from

£635

One-way from

£414

Popular in

December

Cheapest in

January

Average price

£768
Alaska Airlines
  • Alaska Airlines
  • 29/10-5/11
  • 2 total stops
  • 37h 57m total
  • London to Idaho
Search Deals
30/10-31/12
  • 30/10-31/12
  • 2 total stops
  • 56h 19m total
  • London to Idaho
Search Deals
High demand for flights, 3% 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 October 2026
Search Deals

Cheapflights Fare Finder

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

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Route

Depart

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Price

Cheapest return flight

LondonBoise

LGW London Gatwick - BOI Boise Air Term. Gowen Fld

LGWBOI

London Gatwick

Fri 30/10

12:35-14:54

2 stops56h 19m

Boise Air Term. Gowen Fld

Wed 31/12

00:00-08:00

Nonstop0h 00m

£414

LondonBoise

LGW London Gatwick - BOI Boise Air Term. Gowen Fld

LGWBOI

London Gatwick

Sat 16/1

16:10-21:42

3 stops36h 32m

Boise Air Term. Gowen Fld

Wed 31/12

00:00-08:00

Nonstop0h 00m

£439

LondonIdaho Falls

LHR London Heathrow - IDA Idaho Falls Fanning Field

LHRIDA

London Heathrow

Thu 19/11

14:50-15:34

3 stops31h 44m

Idaho Falls Fanning Field

Wed 31/12

00:00-08:00

Nonstop0h 00m

£440

LondonBoise

LHR London Heathrow - BOI Boise Air Term. Gowen Fld

LHRBOI

London Heathrow

Sat 16/1

14:45-14:03

2 stops30h 18m

Boise Air Term. Gowen Fld

Wed 31/12

00:00-08:00

Nonstop0h 00m

£450

LondonBoise

LGW London Gatwick - BOI Boise Air Term. Gowen Fld

LGWBOI

London Gatwick

Sun 8/11

09:35-21:33

3 stops42h 58m

Boise Air Term. Gowen Fld

Wed 31/12

00:00-08:00

Nonstop0h 00m

£458

LondonBoise

LGW London Gatwick - BOI Boise Air Term. Gowen Fld

LGWBOI

London Gatwick

Sat 7/11

18:40-12:57

3 stops49h 17m

Boise Air Term. Gowen Fld

Wed 31/12

00:00-08:00

Nonstop0h 00m

£500

LondonBoise

LGW London Gatwick - BOI Boise Air Term. Gowen Fld

LGWBOI

London Gatwick

Wed 4/11

11:40-16:42

2 stops36h 02m

Boise Air Term. Gowen Fld

Wed 31/12

00:00-08:00

Nonstop0h 00m

£501
Fastest return journey

LondonBoise

LHR London Heathrow - BOI Boise Air Term. Gowen Fld

LHRBOI

London Heathrow

Tue 10/11

13:45-21:15

1 stop14h 30m

Boise Air Term. Gowen Fld

Wed 31/12

00:00-08:00

Nonstop0h 00m

£507

LondonBoise

LHR London Heathrow - BOI Boise Air Term. Gowen Fld

LHRBOI

London Heathrow

Wed 6/1

11:10-15:03

3 stops34h 53m

Boise Air Term. Gowen Fld

Wed 31/12

00:00-08:00

Nonstop0h 00m

£524

LondonIdaho Falls

LHR London Heathrow - IDA Idaho Falls Fanning Field

LHRIDA

London Heathrow

Thu 19/11

14:45-15:09

1 stop31h 24m

Idaho Falls Fanning Field

Wed 31/12

00:00-08:00

Nonstop0h 00m

£557

Flights are sorted by cheapest return flights first.

Deals found on 30/9

Showing 1-10 of 45 resultsSorted by cheapest first
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Best time to book a flight from London to Idaho

Have a flexible travel schedule? Discover the best time to fly to Idaho from London with our price prediction graph.
Estimated return price

Cheapflights Insights

Everything you need to know about your flight from London to Idaho

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

Currently, April is the cheapest month in which you can book a flight from London to Idaho (average of £639). Flying from London to Idaho in August is currently the most expensive (average of £1,123). 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 to Idaho?

Airfare is below average for this route at the moment.
London to Idaho flights typically cost between £674 and £864 in October.
The cheapest return price found within the last 5 days was £635 on Alaska Airlines (29 Oct–5 Nov).

Reviews of airlines servicing Idaho

Get a feel of what it's like to fly with Alaska Airlines,United Airlines, andVirgin Atlantic from London to Idaho by reading reviews from past customers. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
7.9
Good
13,002 reviews
Check prices

Entertainment

7.0

Comfort

7.8

Crew

8.5

Boarding

8.1

Overall

7.9

Food

7.0

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
13,002 reviews
Alaska Airlines
7.9
Good
13,002 reviews
Check prices

Entertainment

7.0

Comfort

7.8

Crew

8.5

Boarding

8.1

Overall

7.9

Food

7.0

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
10,270 reviews
Alaska Airlines
7.9
Good
13,002 reviews
Check prices

Entertainment

7.0

Comfort

7.8

Crew

8.5

Boarding

8.1

Overall

7.9

Food

7.0

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
694 reviews
Alaska Airlines
7.9
Good
13,002 reviews
Check prices

Entertainment

7.0

Comfort

7.8

Crew

8.5

Boarding

8.1

Overall

7.9

Food

7.0

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
8,251 reviews
Alaska Airlines
7.9
Good
13,002 reviews
Check prices

Entertainment

7.0

Comfort

7.8

Crew

8.5

Boarding

8.1

Overall

7.9

Food

7.0

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 to Idaho?

    Airlines like United Airlines, Alaska Airlines, and Scandinavian Airlines fly from London to Idaho in about 15h 09m. The time it takes to get you to your destination can typically vary by up to 7h 50m. The distance from London to Idaho is about 4705 mi. Both multi-stop and direct flights can be found to your destination and back.

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

    While some choose either London Heathrow - Spokane or London Heathrow - Hailey Sun Valley-Friedman, London Heathrow - Boise Air Term. Gowen Fld is the most popular route from London to Idaho.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from London 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 to Idaho?

    Currently, April is the cheapest month in which you can book a flight from London to Idaho (average of £639). Flying from London to Idaho in August is currently the most expensive (average of £1,123). 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 London to Idaho

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Gatwick to Hobby flights
Heathrow to Seattle flights

Top 4 airlines flying from London to Idaho

AirlineCheapestAverageFlexibilityOn-time
LufthansaCheapest£514Average£776FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
United AirlinesCheapest£531Average£938FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Virgin AtlanticCheapest£727Average£879FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
Alaska AirlinesCheapest£744Average£960FlexibilityNo cancel feeOn-time75%
Search Alaska Airlines flights

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Deals for London to Idaho flights are sourced from 900+ travel sites when you use Cheapflights. When all flight results come back, Cheapflights lets you sort and filter flights using different criteria to choose better, like price, airport, cabin class, and plenty of other options.

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Cheapflights taps into our reliable network of hundreds of airlines and travel agencies to find the best deals for flights from London to Idaho for you. Better yet — we are completely free to use.

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

Yes, we can. To see specific flights from London to Idaho with no change fees, users can toggle flexible booking options after using the search form above to find flights.

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Of course! You can now track prices for flights from London to Idaho and get an alert from Cheapflights when they change. Have a valid email address ready and click the bell icon next to the flight deals above to set up your price alerts.

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