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Cheap flights from London to Idaho from £448

LON — BOI
10 Dec — 17 Dec1
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 10/1212:15 -
2 stops16h 59m
Thu 24/1220:46 -
2 stops39h 44m
Deal found 5/11£573
Wed 9/1214:45 -
1 stop16h 14m
Sun 10/106:37 -
1 stop22h 43m
Deal found 5/11£635
Thu 3/1214:45 -
1 stop27h 24m
Thu 10/1211:51 -
1 stop17h 29m
Deal found 5/11£713
Fri 4/1214:45 -
1 stop27h 24m
Fri 11/1211:51 -
1 stop17h 29m
Deal found 6/11£716
Sun 6/1214:45 -
1 stop27h 24m
Sun 13/1211:51 -
1 stop17h 29m
Deal found 8/11£717
Mon 23/1114:45 -
1 stop27h 11m
Sat 12/1211:51 -
1 stop17h 29m
Deal found 7/11£727
Mon 23/1114:45 -
1 stop27h 11m
Wed 23/1219:59 -
1 stop33h 21m
Deal found 7/11£732
Thu 10/1214:45 -
1 stop16h 14m
Thu 24/1217:00 -
1 stop12h 20m
Deal found 5/11£738
Wed 9/1206:35 -
2 stops21h 55m
Sun 10/116:10 -
2 stops34h 30m
Deal found 5/11£745
Sat 21/1114:45 -
1 stop25h 59m
Sat 28/1106:33 -
1 stop22h 47m
Deal found 5/11£750
Tue 8/1214:45 -
1 stop31h 22m
Fri 11/1206:00 -
1 stop23h 20m
Deal found 7/11£753
Thu 24/1212:20 -
1 stop14h 46m
Thu 31/1206:31 -
2 stops18h 14m
Deal found 9/11£776

Find flight deals from London to Idaho

Round-trip from

£573

One-way from

£448

Popular in

August

Cheapest in

April

Average price

£730
10/12-24/12
  • 10/12-24/12
  • 4 total stops
  • 56h 43m total
  • London to Idaho
Search Deals
17/2-31/12
  • 17/2-31/12
  • 2 total stops
  • 35h 08m total
  • London to Idaho
Search Deals
Highest demand for flights based on searches. 10% potential increase in price (£74 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease (£20 potential savings vs. average return price).
Search Deals
Average for round-trip flights in November 2026
Search Deals

Cheapflights Fare Finder

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

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

LondonHailey

LGW London Gatwick - SUN Hailey Sun Valley-Friedman

LGWSUN

London Gatwick

Wed 31/3

15:40-09:38

2 stops24h 58m

Hailey Sun Valley-Friedman

Wed 31/12

00:00-08:00

Nonstop0h 00m

£547

LondonBoise

LHR London Heathrow - BOI Boise Air Term. Gowen Fld

LHRBOI

London Heathrow

Fri 2/4

21:25-22:20

2 stops31h 55m

Boise Air Term. Gowen Fld

Wed 31/12

00:00-08:00

Nonstop0h 00m

£562

LondonIdaho Falls

LGW London Gatwick - IDA Idaho Falls Fanning Field

LGWIDA

London Gatwick

Sun 13/12

10:40-13:17

3 stops57h 37m

Idaho Falls Fanning Field

Wed 31/12

00:00-08:00

Nonstop0h 00m

£565

LondonIdaho Falls

LHR London Heathrow - IDA Idaho Falls Fanning Field

LHRIDA

London Heathrow

Sun 13/12

19:55-13:17

3 stops48h 22m

Idaho Falls Fanning Field

Wed 31/12

00:00-08:00

Nonstop0h 00m

£577

LondonBoise

LHR London Heathrow - BOI Boise Air Term. Gowen Fld

LHRBOI

London Heathrow

Sun 21/3

20:35-23:58

2 stops33h 23m

Boise Air Term. Gowen Fld

Wed 31/12

00:00-08:00

Nonstop0h 00m

£581

LondonHailey

LGW London Gatwick - SUN Hailey Sun Valley-Friedman

LGWSUN

London Gatwick

Thu 1/4

20:10-09:38

3 stops44h 28m

Hailey Sun Valley-Friedman

Wed 31/12

00:00-08:00

Nonstop0h 00m

£598

LondonBoise

LHR London Heathrow - BOI Boise Air Term. Gowen Fld

LHRBOI

London Heathrow

Sun 21/3

20:35-22:20

2 stops31h 45m

Boise Air Term. Gowen Fld

Wed 31/12

00:00-08:00

Nonstop0h 00m

£603

LondonHailey

LHR London Heathrow - SUN Hailey Sun Valley-Friedman

LHRSUN

London Heathrow

Thu 1/4

13:05-09:38

2 stops27h 33m

Hailey Sun Valley-Friedman

Wed 31/12

00:00-08:00

Nonstop0h 00m

£621

LondonHailey

LHR London Heathrow - SUN Hailey Sun Valley-Friedman

LHRSUN

London Heathrow

Wed 31/3

06:30-22:02

2 stops22h 32m

Hailey Sun Valley-Friedman

Wed 31/12

00:00-08:00

Nonstop0h 00m

£626

LondonHailey

LHR London Heathrow - SUN Hailey Sun Valley-Friedman

LHRSUN

London Heathrow

Wed 31/3

17:00-09:38

1 stop23h 38m

Hailey Sun Valley-Friedman

Wed 31/12

00:00-08:00

Nonstop0h 00m

£629

Flights are sorted by cheapest return flights first.

Deals found on 6/11

Showing 1-10 of 50 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 £632). Flying from London to Idaho in August is currently the most expensive (average of £1,111). 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 £594 and £788 in December.
The cheapest return price found within the last 5 days was £573 on Multiple Airlines (10 Dec–24 Dec).

Reviews of airlines servicing Idaho

Get a feel of what it's like to fly with Alaska Airlines,Virgin Atlantic, andUnited Airlines 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
13,158 reviews
Check prices

Crew

8.5

Overall

7.9

Boarding

8.1

Comfort

7.8

Food

7.0

Entertainment

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
13,158 reviews
Alaska Airlines
7.9
Good
13,158 reviews
Check prices

Crew

8.5

Overall

7.9

Boarding

8.1

Comfort

7.8

Food

7.0

Entertainment

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
7.5
Good
698 reviews
Alaska Airlines
7.9
Good
13,158 reviews
Check prices

Crew

8.5

Overall

7.9

Boarding

8.1

Comfort

7.8

Food

7.0

Entertainment

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
7.3
Good
10,479 reviews
Alaska Airlines
7.9
Good
13,158 reviews
Check prices

Crew

8.5

Overall

7.9

Boarding

8.1

Comfort

7.8

Food

7.0

Entertainment

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
8,291 reviews
Alaska Airlines
7.9
Good
13,158 reviews
Check prices

Crew

8.5

Overall

7.9

Boarding

8.1

Comfort

7.8

Food

7.0

Entertainment

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 Alaska Airlines, United Airlines, and KLM fly from London to Idaho in about 21h 50m. The time it takes to get you to your destination can typically vary by up to 15h 13m. 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 - Boise Air Term. Gowen Fld or London Gatwick - Spokane, London Heathrow - Hailey Sun Valley-Friedman 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 £632). Flying from London to Idaho in August is currently the most expensive (average of £1,111). 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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Manchester to Newark flights
Heathrow to Atlanta flights
Manchester to LaGuardia flights
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Edinburgh to John F Kennedy Intl flights
Luton to Los Angeles flights
Heathrow to Tampa flights
Luton to Orlando flights
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Gatwick to Fort Lauderdale flights
Gatwick to Dulles Intl flights
Heathrow to George Bush Intcntl flights

Top 4 airlines flying from London to Idaho

AirlineCheapestAverageFlexibilityOn-time
LufthansaCheapest£508Average£771FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
United AirlinesCheapest£525Average£945FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Alaska AirlinesCheapest£718Average£873FlexibilityNo cancel feeOn-time75%
Search Alaska Airlines flights
Virgin AtlanticCheapest£745Average£870FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic 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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