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Cheap flights from London to Idaho from £389

LON — BOI
17 Oct — 24 Oct1
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

Mon 2/1112:20 -
1 stop14h 42m
Thu 3/1214:05 -
1 stop13h 35m
Deal found 15/9£616
Thu 15/1011:45 -
2 stops19h 14m
Thu 22/1018:04 -
1 stop14h 31m
Deal found 15/9£652
Wed 28/1012:20 -
1 stop15h 46m
Wed 4/1113:53 -
1 stop13h 47m
Deal found 13/9£666
Tue 27/1013:30 -
2 stops34h 33m
Tue 3/1119:10 -
2 stops31h 30m
Deal found 12/9£680
Wed 28/1014:30 -
2 stops26h 49m
Wed 4/1106:30 -
2 stops17h 40m
Deal found 13/9£688
Mon 2/1115:20 -
2 stops32h 22m
Thu 3/1206:15 -
2 stops16h 40m
Deal found 15/9£689
Thu 29/1012:20 -
1 stop16h 05m
Thu 5/1112:41 -
1 stop13h 59m
Deal found 14/9£703
Mon 2/1106:20 -
2 stops22h 13m
Mon 16/1110:13 -
1 stop17h 42m
Deal found 13/9£709
Fri 30/1012:20 -
1 stop15h 46m
Fri 6/1113:53 -
1 stop13h 47m
Deal found 15/9£710
Tue 24/1107:40 -
2 stops22h 11m
Tue 15/1214:48 -
1 stop11h 52m
Deal found 16/9£712
Sun 1/1111:50 -
1 stop16h 43m
Mon 16/1110:13 -
1 stop17h 42m
Deal found 15/9£714
Thu 19/1111:35 -
2 stops31h 03m
Sun 29/1116:10 -
1 stop33h 30m
Deal found 15/9£718

Find flight deals from London to Idaho

Round-trip from

£616

One-way from

£389

Popular in

December

Cheapest in

January

Average price

£746
2/11-3/12
  • 2/11-3/12
  • 2 total stops
  • 28h 17m total
  • London to Idaho
Search Deals
2/11-31/12
  • 2/11-31/12
  • 3 total stops
  • 48h 58m total
  • London to Idaho
Search Deals
High demand for flights, 2% 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 September 2026
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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

Return

Price

Cheapest return flight

LondonBoise

LHR London Heathrow - BOI Boise Air Term. Gowen Fld

LHRBOI

London Heathrow

Tue 20/10

14:10-13:55

3 stops54h 45m

Boise Air Term. Gowen Fld

Wed 31/12

00:00-08:00

Nonstop0h 00m

£418

LondonBoise

LHR London Heathrow - BOI Boise Air Term. Gowen Fld

LHRBOI

London Heathrow

Mon 2/11

14:50-12:09

2 stops28h 19m

Boise Air Term. Gowen Fld

Wed 31/12

00:00-08:00

Nonstop0h 00m

£429

LondonBoise

LGW London Gatwick - BOI Boise Air Term. Gowen Fld

LGWBOI

London Gatwick

Mon 2/11

08:35-21:33

2 stops19h 58m

Boise Air Term. Gowen Fld

Wed 31/12

00:00-08:00

Nonstop0h 00m

£447

LondonBoise

LGW London Gatwick - BOI Boise Air Term. Gowen Fld

LGWBOI

London Gatwick

Tue 20/10

12:40-13:55

2 stops56h 15m

Boise Air Term. Gowen Fld

Wed 31/12

00:00-08:00

Nonstop0h 00m

£455

LondonBoise

LCY London City - BOI Boise Air Term. Gowen Fld

LCYBOI

London City

Mon 2/11

09:15-21:33

2 stops19h 18m

Boise Air Term. Gowen Fld

Wed 31/12

00:00-08:00

Nonstop0h 00m

£458

LondonSpokane

LHR London Heathrow - GEG Spokane

LHRGEG

London Heathrow

Mon 14/12

21:05-22:25

3 stops33h 20m

Spokane

Wed 31/12

00:00-09:00

Nonstop0h 00m

£463

LondonBoise

LCY London City - BOI Boise Air Term. Gowen Fld

LCYBOI

London City

Tue 20/10

18:05-13:55

3 stops50h 50m

Boise Air Term. Gowen Fld

Wed 31/12

00:00-08:00

Nonstop0h 00m

£481

LondonSpokane

LHR London Heathrow - GEG Spokane

LHRGEG

London Heathrow

Sun 6/12

20:15-17:53

2 stops29h 38m

Spokane

Wed 31/12

00:00-09:00

Nonstop0h 00m

£482

LondonBoise

LGW London Gatwick - BOI Boise Air Term. Gowen Fld

LGWBOI

London Gatwick

Fri 8/1

11:55-13:17

3 stops32h 22m

Boise Air Term. Gowen Fld

Wed 31/12

00:00-08:00

Nonstop0h 00m

£503

LondonBoise

LHR London Heathrow - BOI Boise Air Term. Gowen Fld

LHRBOI

London Heathrow

Tue 1/12

11:35-21:52

1 stop17h 17m

Boise Air Term. Gowen Fld

Wed 31/12

00:00-08:00

Nonstop0h 00m

£504

Flights are sorted by cheapest return flights first.

Deals found on 12/9

Showing 1-10 of 60 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 £630). Flying from London to Idaho in August is currently the most expensive (average of £1,108). 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 £683 and £796 in November.
The cheapest return price found within the last 5 days was £616 on Multiple Airlines (2 Nov–3 Dec).

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
12,932 reviews
Check prices

Boarding

8.1

Overall

7.9

Entertainment

7.0

Comfort

7.8

Crew

8.5

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
12,932 reviews
Alaska Airlines
7.9
Good
12,932 reviews
Check prices

Boarding

8.1

Overall

7.9

Entertainment

7.0

Comfort

7.8

Crew

8.5

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
10,214 reviews
Alaska Airlines
7.9
Good
12,932 reviews
Check prices

Boarding

8.1

Overall

7.9

Entertainment

7.0

Comfort

7.8

Crew

8.5

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
12,932 reviews
Check prices

Boarding

8.1

Overall

7.9

Entertainment

7.0

Comfort

7.8

Crew

8.5

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
8,226 reviews
Alaska Airlines
7.9
Good
12,932 reviews
Check prices

Boarding

8.1

Overall

7.9

Entertainment

7.0

Comfort

7.8

Crew

8.5

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 Virgin Atlantic fly from London to Idaho in about 16h 14m. The time it takes to get you to your destination can typically vary by up to 22h 20m. The distance from London to Idaho is about 4829 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 Gatwick - Spokane, 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 £630). Flying from London to Idaho in August is currently the most expensive (average of £1,108). 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

Heathrow to John F Kennedy Intl flights
Heathrow to Newark flights
Gatwick to John F Kennedy Intl flights
Heathrow to LaGuardia flights
Stansted to John F Kennedy Intl flights
London City to John F Kennedy Intl flights
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London City to Newark flights
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Luton to Newark flights
Heathrow to Miami flights
Gatwick to LaGuardia flights
Heathrow to Los Angeles flights
Manchester to John F Kennedy Intl flights
Gatwick to Orlando flights
Heathrow to Dallas/Fort Worth flights
Heathrow to San Francisco flights
Heathrow to Boston flights
Heathrow to Las Vegas flights
Manchester to Orlando flights
Heathrow to O'Hare Intl flights
Stansted to Orlando flights
Heathrow to Hobby flights
Gatwick to Miami flights
Manchester to Newark flights
London City to Orlando flights
Heathrow to Dulles Intl flights
Manchester to LaGuardia flights
London City to Miami flights
Stansted to Miami flights
Heathrow to Seattle flights
London City to Los Angeles flights
Gatwick to Los Angeles flights
Heathrow to Baltimore flights
Heathrow to Atlanta flights
Heathrow to George Bush Intcntl flights
Gatwick to Las Vegas flights
Luton to Orlando flights
Heathrow to Fort Lauderdale flights
Heathrow to Tampa flights
Stansted to Los Angeles flights
Luton to Miami flights
Edinburgh to Newark flights
London City to Las Vegas flights
Gatwick to Boston flights
Gatwick to San Francisco flights
London City to San Francisco flights
London City to Boston flights

Top 4 airlines flying from London to Idaho

AirlineCheapestAverageFlexibilityOn-time
LufthansaCheapest£507Average£765FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
United AirlinesCheapest£524Average£925FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Virgin AtlanticCheapest£673Average£866FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
Alaska AirlinesCheapest£734Average£947FlexibilityNo 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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