Find flights
When to book
Airlines
FAQs

Cheap flights from London to Idaho from £418

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 3/6. Fares are subject to change and may not be available on all flights or dates of travel.
LON — BOI
6 Jun — 13 Jun1
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
Explore the most affordable flight options available from London to Idaho. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 7 May 2026.

Fri 29/513:05
LHR
-
BOI
2 stops17h 53m
Multiple Airlines
Fri 5/616:19
BOI
-
LHR
2 stops21h 01m
Multiple Airlines
Deal found 5/5£644
Wed 16/908:40
LHR
-
GEG
2 stops20h 36m
United Airlines
Sun 20/913:38
GEG
-
LHR
2 stops34h 07m
United Airlines
Deal found 5/5£654
Tue 1/906:55
LHR
-
GEG
2 stops22h 09m
United Airlines
Tue 8/906:00
GEG
-
LHR
1 stop17h 25m
United Airlines
Deal found 3/5£659
Tue 1/914:50
LHR
-
GEG
1 stop14h 14m
Lufthansa
Tue 8/913:38
GEG
-
LHR
1 stop14h 47m
Lufthansa
Deal found 3/5£672
Wed 30/913:05
LHR
-
BOI
2 stops17h 47m
United Airlines
Sun 4/1019:05
BOI
-
LHR
1 stop29h 20m
United Airlines
Deal found 5/5£681
Wed 9/915:40
LGW
-
GEG
2 stops16h 19m
Icelandair
Sun 13/912:30
GEG
-
LGW
2 stops18h 10m
Icelandair
Deal found 4/5£741
Wed 3/606:30
LHR
-
BOI
2 stops18h 26m
Lufthansa
Wed 10/612:30
BOI
-
LHR
1 stop16h 25m
Lufthansa
Deal found 6/5£751
Tue 23/608:30
LHR
-
BOI
2 stops21h 26m
Lufthansa
Tue 30/610:20
BOI
-
LHR
1 stop16h 20m
Lufthansa
Deal found 5/5£752
Tue 23/613:00
LHR
-
BOI
1 stop31h 08m
Lufthansa
Sun 5/717:46
BOI
-
LHR
1 stop32h 54m
Lufthansa
Deal found 6/5£772
Wed 3/608:40
LHR
-
GEG
2 stops22h 34m
United Airlines
Wed 10/616:08
GEG
-
LHR
1 stop12h 27m
United Airlines
Deal found 6/5£772
Sat 16/510:20
LGW
-
GEG
2 stops18h 58m
Multiple Airlines
Sat 23/512:36
GEG
-
LGW
2 stops22h 09m
Multiple Airlines
Deal found 5/5£772
Wed 16/1211:35
LHR
-
GEG
1 stop17h 34m
Lufthansa
Wed 6/107:02
GEG
-
LHR
1 stop16h 23m
Lufthansa
Deal found 7/5£774

Find flight deals from London to Idaho

Keep the following information in mind while searching for London to Idaho flight deals. Data was last updated 7 May 2026.

Round-trip from

£644

One-way from

£418

Popular in

December

Cheapest in

January

Average price

£696
29/5-5/6
  • 29/5-5/6
  • 4 total stops
  • 38h 54m total
  • London to Idaho
Search Deals
3/6
  • 3/6
  • 3 total stops
  • 37h 57m total
  • London to Idaho
Search Deals
Highest demand for flights based on searches. 7% potential increase in price (£42 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 5% potential price decrease (£29 potential savings vs. average return price).
Search Deals
Average for round-trip flights in May 2026
Search Deals

Cheapflights Fare Finder

 
Customise your flight search to find flights from London to Idaho that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 858,174 searches. Data last updated 7 May 2026.
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

LondonSpokane

LHR - GEG

LHRGEG

London Heathrow

Wed 16/9

08:40-10:35

2 stops33h 55m

Spokane

Sun 20/9

12:57-07:25

1 stop34h 28m

£654

LondonSpokane

LHR - GEG

LHRGEG

London Heathrow

Tue 1/9

06:55-21:04

2 stops22h 09m

Spokane

Tue 8/9

06:00-07:25

1 stop17h 25m

£659

LondonBoise

LHR - BOI

LHRBOI

London Heathrow

Wed 30/9

13:05-23:52

2 stops17h 47m

Boise Air Term. Gowen Fld

Sun 4/10

19:05-07:25

1 stop29h 20m

£681

LondonSpokane

LGW - GEG

LGWGEG

London Gatwick

Wed 9/9

15:40-23:59

2 stops16h 19m

Spokane

Sun 13/9

12:30-14:40

2 stops18h 10m

£741

LondonSpokane

LGW - GEG

LGWGEG

London Gatwick

Fri 5/6

15:40-23:59

2 stops16h 19m

Spokane

Fri 12/6

06:13-11:45

2 stops45h 32m

£799

LondonSpokane

LGW - GEG

LGWGEG

London Gatwick

Wed 3/6

15:40-23:59

2 stops16h 19m

Spokane

Wed 10/6

19:45-14:40

2 stops34h 55m

£800

LondonBoise

LHR - BOI

LHRBOI

London Heathrow

Tue 23/6

16:15-23:55

1 stop14h 40m

Boise Air Term. Gowen Fld

Sun 5/7

19:05-07:25

1 stop29h 20m

£802

LondonSpokane

LGW - GEG

LGWGEG

London Gatwick

Wed 8/7

15:40-20:56

2 stops37h 16m

Spokane

Tue 28/7

19:45-14:40

2 stops34h 55m

£805

LondonIdaho Falls

LGW - IDA

LGWIDA

London Gatwick

Tue 1/9

13:00-22:56

2 stops16h 56m

Idaho Falls Fanning Field

Fri 25/9

06:18-14:40

2 stops25h 22m

£810

LondonIdaho Falls

LHR - IDA

LHRIDA

London Heathrow

Tue 1/9

13:05-22:56

2 stops16h 51m

Idaho Falls Fanning Field

Fri 25/9

06:18-20:20

2 stops31h 02m

£810

Flights are sorted by cheapest return flights first.

Deals found on 6/5

Showing 1-10 of 60 resultsSorted by cheapest first
1
2
3
...
6

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
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

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

How far ahead should I book a flight from London to Idaho?

The best time to book flights from London to Idaho is 82 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.

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

Currently, January is the cheapest month in which you can book a flight from London to Idaho (average of £495). Flying from London to Idaho in July is currently the most expensive (average of £629). 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?

Reviews of airlines servicing Idaho

Get insights into the airlines that provide service to Idaho. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Idaho. Reviews last updated 7 May 2026.
Get a feel of what it's like to fly with United Airlines,Virgin Atlantic, andIcelandair 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.
United Airlines
7.4
Good
9,693 reviews
Check prices

Overall

7.4

Food

6.6

Boarding

7.7

Crew

8.1

Entertainment

7.1

Comfort

7.3

Reviews

1 / 20
8.0
Excellent

Anonymous,Apr 2026

DFW - EWR

The flight was on time. Crew was friendly. Will fly again. The seats was comfortable.
United Airlines
7.4
Good
9,693 reviews
United Airlines
7.4
Good
9,693 reviews
Check prices

Overall

7.4

Food

6.6

Boarding

7.7

Crew

8.1

Entertainment

7.1

Comfort

7.3

Reviews

1 / 20
8.0
Excellent

Anonymous,Apr 2026

DFW - EWR

The flight was on time. Crew was friendly. Will fly again. The seats was comfortable.
Virgin Atlantic
7.4
Good
688 reviews
United Airlines
7.4
Good
9,693 reviews
Check prices

Overall

7.4

Food

6.6

Boarding

7.7

Crew

8.1

Entertainment

7.1

Comfort

7.3

Reviews

1 / 20
8.0
Excellent

Anonymous,Apr 2026

DFW - EWR

The flight was on time. Crew was friendly. Will fly again. The seats was comfortable.
Icelandair
7.0
Good
653 reviews
United Airlines
7.4
Good
9,693 reviews
Check prices

Overall

7.4

Food

6.6

Boarding

7.7

Crew

8.1

Entertainment

7.1

Comfort

7.3

Reviews

1 / 20
8.0
Excellent

Anonymous,Apr 2026

DFW - EWR

The flight was on time. Crew was friendly. Will fly again. The seats was comfortable.
Lufthansa
6.8
Okay
7,981 reviews
United Airlines
7.4
Good
9,693 reviews
Check prices

Overall

7.4

Food

6.6

Boarding

7.7

Crew

8.1

Entertainment

7.1

Comfort

7.3

Reviews

1 / 20
8.0
Excellent

Anonymous,Apr 2026

DFW - EWR

The flight was on time. Crew was friendly. Will fly again. The seats was comfortable.

Related info for your journey

Find useful and relevant information for your journey from London to Idaho. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • How long is the flight from London to Idaho?

    Airlines like United Airlines, Icelandair, and KLM fly from London to Idaho in about 16h 19m. The time it takes to get you to your destination can typically vary by up to 17h 36m. The distance from London to Idaho is about 4667 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 Gatwick - Boise Air Term. Gowen Fld or London Heathrow - Idaho Falls Fanning Field, 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, January is the cheapest month in which you can book a flight from London to Idaho (average of £495). Flying from London to Idaho in July is currently the most expensive (average of £629). 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

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for London to Idaho

See prices for flight routes from nearby airports that may be better suited for you.
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
Gatwick to Newark flights
London City to John F Kennedy Intl flights
Gatwick to LaGuardia flights
Heathrow to Los Angeles flights
Luton to John F Kennedy Intl flights
Heathrow to Orlando flights
Stansted to Newark flights
Heathrow to Boston flights
Luton to Newark flights
London City to Newark flights
Heathrow to Miami flights
Manchester to John F Kennedy Intl flights
Heathrow to San Francisco flights
Heathrow to Dulles Intl flights
Heathrow to O'Hare Intl flights
Gatwick to Boston flights
Manchester to Orlando flights
Heathrow to Atlanta flights
Heathrow to Baltimore flights
Gatwick to Los Angeles flights
Heathrow to Seattle flights
Heathrow to Dallas/Fort Worth flights
Heathrow to Las Vegas flights
Stansted to Los Angeles flights
Gatwick to Orlando flights
London City to Los Angeles flights
Heathrow to Hobby flights
Manchester to Newark flights
London City to Boston flights
Stansted to Orlando flights
Stansted to Boston flights
Gatwick to Miami flights
Stansted to LaGuardia flights
Stansted to Miami flights
Heathrow to Ontario flights
London City to San Francisco flights
London City to Miami flights
Heathrow to George Bush Intcntl flights
Heathrow to Tampa flights
Heathrow to Reagan-National flights
Manchester to LaGuardia flights
Gatwick to Dulles Intl flights
Luton to Los Angeles flights
Heathrow to Denver flights
Stansted to Dulles Intl flights

Top 3 airlines flying from London to Idaho

Discover the top 3 airlines that operate flights from London to Idaho. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 858,174 searches. Data last updated 7 May 2026.
AirlineCheapestAverageFlexibilityOn-time
LufthansaCheapest£501Average£663FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
United AirlinesCheapest£539Average£852FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Virgin AtlanticCheapest£592Average£822FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travellers can enjoy low prices and a wide availability of flights to their desired destinations.

How does Cheapflights help users find flights from London to Idaho?

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.

Why should you use Cheapflights to find cheap flight tickets from London to Idaho?

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.

Can Cheapflights notify me if prices for flights from London to Idaho become cheaper?

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.

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.