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Cheap flights from London to Idaho from £405

LON — BOI
29 Nov — 6 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

Wed 4/1106:40 -
2 stops23h 24m
Sun 8/1116:00 -
2 stops22h 40m
Deal found 26/10£651
Fri 11/1214:45 -
1 stop30h 34m
Thu 24/1214:12 -
1 stop15h 08m
Deal found 28/10£723
Mon 23/1114:45 -
1 stop25h 59m
Sun 6/1219:45 -
1 stop33h 35m
Deal found 26/10£726
Mon 23/1106:30 -
2 stops18h 33m
Sun 6/1208:15 -
2 stops20h 05m
Deal found 26/10£735
Fri 27/1107:40 -
2 stops20h 35m
Fri 4/1206:10 -
2 stops20h 30m
Deal found 28/10£745
Mon 9/1114:45 -
1 stop14h 35m
Thu 12/1110:49 -
1 stop18h 31m
Deal found 25/10£747
Sat 21/1114:45 -
1 stop31h 43m
Sat 28/1106:33 -
1 stop22h 47m
Deal found 29/10£749
Mon 9/1112:15 -
2 stops18h 31m
Thu 12/1112:49 -
2 stops23h 41m
Deal found 28/10£774
Tue 17/1111:50 -
1 stop16h 53m
Mon 30/1113:43 -
2 stops37h 42m
Deal found 27/10£875
Tue 17/1108:20 -
1 stop20h 23m
Mon 30/1108:00 -
1 stop21h 10m
Deal found 27/10£894
Tue 17/1106:35 -
2 stops34h 18m
Mon 30/1110:35 -
2 stops18h 25m
Deal found 27/10£985
Wed 23/1217:35 -
2 stops35h 40m
Tue 29/1213:40 -
1 stop14h 00m
Deal found 27/10£992

Find flight deals from London to Idaho

Round-trip from

£651

One-way from

£405

Popular in

August

Cheapest in

April

Average price

£859
Scandinavian Airlines
  • Scandinavian Airlines
  • 9/11-14/11
  • 4 total stops
  • 42h 32m total
  • London to Idaho
Search Deals
3/12-31/12
  • 3/12-31/12
  • 3 total stops
  • 35h 18m total
  • London to Idaho
Search Deals
Highest demand for flights based on searches. 10% potential increase in price (£75 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 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.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

LondonIdaho Falls

LGW London Gatwick - IDA Idaho Falls Fanning Field

LGWIDA

London Gatwick

Wed 9/12

09:00-15:15

3 stops37h 15m

Idaho Falls Fanning Field

Wed 31/12

00:00-08:00

Nonstop0h 00m

£414

LondonIdaho Falls

LHR London Heathrow - IDA Idaho Falls Fanning Field

LHRIDA

London Heathrow

Thu 10/12

06:00-12:51

3 stops37h 51m

Idaho Falls Fanning Field

Wed 31/12

00:00-08:00

Nonstop0h 00m

£447

LondonIdaho Falls

LHR London Heathrow - IDA Idaho Falls Fanning Field

LHRIDA

London Heathrow

Wed 9/12

14:50-15:15

2 stops31h 25m

Idaho Falls Fanning Field

Wed 31/12

00:00-08:00

Nonstop0h 00m

£462

LondonIdaho Falls

LHR London Heathrow - IDA Idaho Falls Fanning Field

LHRIDA

London Heathrow

Mon 11/1

15:20-13:19

2 stops28h 59m

Idaho Falls Fanning Field

Wed 31/12

00:00-08:00

Nonstop0h 00m

£511

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

£558

LondonBoise

LHR London Heathrow - BOI Boise Air Term. Gowen Fld

LHRBOI

London Heathrow

Wed 6/1

10:25-11:55

1 stop32h 30m

Boise Air Term. Gowen Fld

Wed 31/12

00:00-08:00

Nonstop0h 00m

£569

LondonBoise

LHR London Heathrow - BOI Boise Air Term. Gowen Fld

LHRBOI

London Heathrow

Mon 30/11

14:50-12:31

2 stops28h 41m

Boise Air Term. Gowen Fld

Wed 31/12

00:00-08:00

Nonstop0h 00m

£576

LondonBoise

LHR London Heathrow - BOI Boise Air Term. Gowen Fld

LHRBOI

London Heathrow

Wed 6/1

14:45-23:46

1 stop16h 01m

Boise Air Term. Gowen Fld

Wed 31/12

00:00-08:00

Nonstop0h 00m

£585

LondonBoise

LHR London Heathrow - BOI Boise Air Term. Gowen Fld

LHRBOI

London Heathrow

Sat 28/11

14:50-09:44

3 stops49h 54m

Boise Air Term. Gowen Fld

Wed 31/12

00:00-08:00

Nonstop0h 00m

£596

LondonBoise

LHR London Heathrow - BOI Boise Air Term. Gowen Fld

LHRBOI

London Heathrow

Wed 7/4

14:10-23:06

1 stop15h 56m

Boise Air Term. Gowen Fld

Wed 31/12

00:00-08:00

Nonstop0h 00m

£626

Flights are sorted by cheapest return flights first.

Deals found on 30/10

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 £635). Flying from London to Idaho in August is currently the most expensive (average of £1,117). 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 typical for this route at the moment.
London to Idaho flights typically cost between £597 and £754 in November.
The cheapest return price found within the last 5 days was £651 on Scandinavian Airlines (9 Nov–14 Nov).

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
13,134 reviews
Check prices

Overall

7.9

Entertainment

7.0

Food

7.0

Comfort

7.8

Crew

8.5

Boarding

8.1

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
13,134 reviews
Alaska Airlines
7.9
Good
13,134 reviews
Check prices

Overall

7.9

Entertainment

7.0

Food

7.0

Comfort

7.8

Crew

8.5

Boarding

8.1

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
13,134 reviews
Check prices

Overall

7.9

Entertainment

7.0

Food

7.0

Comfort

7.8

Crew

8.5

Boarding

8.1

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
10,451 reviews
Alaska Airlines
7.9
Good
13,134 reviews
Check prices

Overall

7.9

Entertainment

7.0

Food

7.0

Comfort

7.8

Crew

8.5

Boarding

8.1

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
8,298 reviews
Alaska Airlines
7.9
Good
13,134 reviews
Check prices

Overall

7.9

Entertainment

7.0

Food

7.0

Comfort

7.8

Crew

8.5

Boarding

8.1

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 Delta fly from London to Idaho in about 27h 52m. The time it takes to get you to your destination can typically vary by up to 7h 43m. 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 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 £635). Flying from London to Idaho in August is currently the most expensive (average of £1,117). 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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London City to Boston flights

Top 4 airlines flying from London to Idaho

AirlineCheapestAverageFlexibilityOn-time
LufthansaCheapest£511Average£775FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
United AirlinesCheapest£528Average£949FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Alaska AirlinesCheapest£722Average£877FlexibilityNo cancel feeOn-time75%
Search Alaska Airlines flights
Virgin AtlanticCheapest£722Average£853FlexibilityNo 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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