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Cheap flights from the United Kingdom to Idaho from £399

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 19/5. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — BOI
4 May — 11 May1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from United Kingdom to Idaho

Enter your travel dates to find the best prices.

Cheapest flights from United Kingdom to Idaho
Explore the most affordable flight options available from United Kingdom to Idaho. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 4 April 2026.

Tue 28/407:25
LHR
-
GEG
2 stops21h 46m
Lufthansa
Tue 5/512:25
GEG
-
LHR
2 stops22h 15m
Lufthansa
Deal found 30/3£649
Wed 30/908:40
LHR
-
GEG
2 stops22h 58m
United Airlines
Sun 4/1016:00
GEG
-
LHR
2 stops30h 55m
United Airlines
Deal found 30/3£657
Wed 4/1109:00
LHR
-
GEG
2 stops22h 38m
United Airlines
Sun 8/1105:00
GEG
-
LHR
2 stops42h 30m
United Airlines
Deal found 2/4£658
Tue 5/508:45
LHR
-
BOI
2 stops33h 42m
United Airlines
Tue 19/506:30
BOI
-
LHR
2 stops18h 50m
United Airlines
Deal found 3/4£658
Tue 6/1007:25
LHR
-
BOI
2 stops17h 30m
United Airlines
Wed 21/1010:39
BOI
-
LHR
2 stops17h 01m
United Airlines
Deal found 30/3£663
Tue 6/1014:50
LHR
-
BOI
1 stop13h 26m
Lufthansa
Wed 21/1014:43
BOI
-
LHR
1 stop11h 57m
Lufthansa
Deal found 30/3£672
Wed 22/413:05
LHR
-
GEG
2 stops16h 26m
Icelandair
Tue 28/414:45
GEG
-
LHR
2 stops21h 35m
Icelandair
Deal found 1/4£673
Wed 7/1009:30
LHR
-
BOI
2 stops18h 46m
United Airlines
Mon 19/1006:20
BOI
-
LHR
1 stop18h 05m
United Airlines
Deal found 30/3£687
Tue 6/1015:05
LHR
-
BOI
2 stops25h 38m
Air Canada
Mon 19/1016:05
BOI
-
LHR
2 stops31h 25m
Air Canada
Deal found 30/3£689
Fri 11/910:50
LHR
-
BOI
2 stops20h 00m
United Airlines
Tue 15/905:00
BOI
-
LHR
2 stops17h 55m
United Airlines
Deal found 2/4£691
Wed 22/413:05
LHR
-
GEG
2 stops16h 26m
Icelandair
Wed 29/406:00
GEG
-
LHR
2 stops30h 20m
Icelandair
Deal found 2/4£692
Fri 25/907:30
LHR
-
BOI
2 stops21h 52m
United Airlines
Tue 29/917:22
BOI
-
LHR
1 stop11h 58m
United Airlines
Deal found 30/3£692

Find flight deals from United Kingdom to Idaho

Keep the following information in mind while searching for United Kingdom to Idaho flight deals. Data was last updated 4 April 2026.

Round-trip from

£649

One-way from

£425

Popular in

December

Cheapest in

January

Average price

£636
Lufthansa
  • Lufthansa
  • 28/4-5/5
  • 4 total stops
  • 44h 01m total
  • United Kingdom to Idaho
Search Deals
15/6
  • 15/6
  • 3 total stops
  • 43h 03m total
  • United Kingdom to Idaho
Search Deals
Highest demand for flights based on searches. 9% potential increase in price (£57 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 5% potential price decrease (£32 potential savings vs. average return price).
Search Deals
Average for round-trip flights in April 2026
Search Deals

Cheapflights Fare Finder

 
Customise your flight search to find flights from United Kingdom 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 4 April 2026.
Use the filters below to find and compare flights from the United Kingdom 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 30/9

08:40-23:38

2 stops22h 58m

Spokane

Sun 4/10

16:00-09:40

1 stop33h 40m

£657

LondonBoise

LHR - BOI

LHRBOI

London Heathrow

Tue 5/5

08:45-11:27

2 stops33h 42m

Boise Air Term. Gowen Fld

Tue 19/5

08:02-10:10

1 stop19h 08m

£658

LondonBoise

LHR - BOI

LHRBOI

London Heathrow

Fri 11/9

10:50-11:00

2 stops31h 10m

Boise Air Term. Gowen Fld

Tue 15/9

17:44-12:25

1 stop11h 41m

£691

LondonBoise

LHR - BOI

LHRBOI

London Heathrow

Fri 25/9

09:30-22:22

2 stops19h 52m

Boise Air Term. Gowen Fld

Tue 29/9

07:00-05:55

2 stops15h 55m

£692

LondonBoise

LGW - BOI

LGWBOI

London Gatwick

Tue 14/4

15:40-22:57

2 stops38h 17m

Boise Air Term. Gowen Fld

Tue 12/5

16:38-14:40

2 stops15h 02m

£709

LondonBoise

LGW - BOI

LGWBOI

London Gatwick

Tue 14/4

15:40-22:57

2 stops38h 17m

Boise Air Term. Gowen Fld

Tue 28/4

18:08-11:45

2 stops34h 37m

£711

LondonBoise

LHR - BOI

LHRBOI

London Heathrow

Sun 6/9

16:15-23:50

1 stop14h 35m

Boise Air Term. Gowen Fld

Sun 20/9

19:01-07:25

1 stop29h 24m

£715

LondonSpokane

LGW - GEG

LGWGEG

London Gatwick

Wed 22/4

15:40-23:55

2 stops16h 15m

Spokane

Tue 28/4

14:45-14:40

2 stops15h 55m

£716

LondonSpokane

LHR - GEG

LHRGEG

London Heathrow

Wed 22/4

09:55-21:05

2 stops19h 10m

Spokane

Tue 28/4

12:36-13:15

1 stop16h 39m

£765

LondonBoise

LGW - BOI

LGWBOI

London Gatwick

Thu 16/4

15:40-22:57

2 stops38h 17m

Boise Air Term. Gowen Fld

Tue 5/5

16:38-14:40

2 stops15h 02m

£765

Flights are sorted by cheapest return flights first.

Deals found on 4/4

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

Best time to book a flight from United Kingdom to Idaho

Have a flexible travel schedule? Discover the best time to fly to Idaho from United Kingdom 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 the United Kingdom to Idaho

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

Currently, March is the cheapest month in which you can book a flight from United Kingdom to Idaho (average of £518). Flying from United Kingdom to Idaho in February is currently the most expensive (average of £691). 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.

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 4 April 2026.
See what other customers who have flown with KLM,Virgin Atlantic, andUnited Airlines from the United Kingdom to Idaho have to say. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
KLM
7.7
Good
1,487 reviews
Check prices

Comfort

7.6

Boarding

7.8

Entertainment

7.1

Food

7.3

Overall

7.7

Crew

8.4

Reviews

1 / 20
2.0
Mediocre

Anonymous,Feb 2026

EZE - SCL

It was a short trip The aeroplane was delay I arrived in Chile late and I lost my fly with Qantas
KLM
7.7
Good
1,487 reviews
KLM
7.7
Good
1,487 reviews
Check prices

Comfort

7.6

Boarding

7.8

Entertainment

7.1

Food

7.3

Overall

7.7

Crew

8.4

Reviews

1 / 20
2.0
Mediocre

Anonymous,Feb 2026

EZE - SCL

It was a short trip The aeroplane was delay I arrived in Chile late and I lost my fly with Qantas
Virgin Atlantic
7.5
Good
685 reviews
KLM
7.7
Good
1,487 reviews
Check prices

Comfort

7.6

Boarding

7.8

Entertainment

7.1

Food

7.3

Overall

7.7

Crew

8.4

Reviews

1 / 20
2.0
Mediocre

Anonymous,Feb 2026

EZE - SCL

It was a short trip The aeroplane was delay I arrived in Chile late and I lost my fly with Qantas
United Airlines
7.4
Good
9,542 reviews
KLM
7.7
Good
1,487 reviews
Check prices

Comfort

7.6

Boarding

7.8

Entertainment

7.1

Food

7.3

Overall

7.7

Crew

8.4

Reviews

1 / 20
2.0
Mediocre

Anonymous,Feb 2026

EZE - SCL

It was a short trip The aeroplane was delay I arrived in Chile late and I lost my fly with Qantas
Icelandair
7.0
Good
630 reviews
KLM
7.7
Good
1,487 reviews
Check prices

Comfort

7.6

Boarding

7.8

Entertainment

7.1

Food

7.3

Overall

7.7

Crew

8.4

Reviews

1 / 20
2.0
Mediocre

Anonymous,Feb 2026

EZE - SCL

It was a short trip The aeroplane was delay I arrived in Chile late and I lost my fly with Qantas
Lufthansa
6.8
Okay
7,890 reviews
KLM
7.7
Good
1,487 reviews
Check prices

Comfort

7.6

Boarding

7.8

Entertainment

7.1

Food

7.3

Overall

7.7

Crew

8.4

Reviews

1 / 20
2.0
Mediocre

Anonymous,Feb 2026

EZE - SCL

It was a short trip The aeroplane was delay I arrived in Chile late and I lost my fly with Qantas

Related info for your journey

Find useful and relevant information for your journey from United Kingdom 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 United Kingdom to Idaho?

    Departing from United Kingdom to Idaho will take you 19h 56m. The distance between United Kingdom and Idaho is about 4655 mi. This flight may include one or multiple stops.

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

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

  • How can I find direct flights from United Kingdom to Idaho?

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

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

    Yes. Cheapflights offers flight deals from United Kingdom 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 United Kingdom to Idaho?

    Currently, March is the cheapest month in which you can book a flight from United Kingdom to Idaho (average of £518). Flying from United Kingdom to Idaho in February is currently the most expensive (average of £691). 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

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Alternative routes for United Kingdom to Idaho

See prices for flight routes from nearby airports that may be better suited for you.
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Top 7 airlines flying from United Kingdom to Idaho

Discover the top 7 airlines that operate flights from United Kingdom 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 4 April 2026.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest£476Average£813FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
LufthansaCheapest£516Average£682FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
Virgin AtlanticCheapest£609Average£827FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
Scandinavian AirlinesCheapest£612Average£936FlexibilityNo cancel feeOn-time77%
Search Scandinavian Airlines flights
KLMCheapest£711Average£806FlexibilityNo cancel feeOn-time75%
Search KLM flights
IcelandairCheapest£713Average£743FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
DeltaCheapest£808Average£1,182FlexibilityNo cancel feeOn-timeN/A
Search Delta 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 United Kingdom to Idaho?

Deals for United Kingdom 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 United Kingdom to Idaho?

Cheapflights helps you find that perfect flight to Idaho from United Kingdom by searching from hundreds of airlines and agencies you know and love. We are also free to use, in case you were wondering!

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

Need flexible booking options for your flight to Idaho from United Kingdom? Don’t worry, Cheapflights have you covered. Use our search filter to only show flights with no change fees.

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

Yes! Start tracking prices for United Kingdom to Idaho flights today and get alerted whenever prices for these flights change. To access this feature, click the bell icon next to the flight deals above, which will prompt you for a valid email address to receive your alerts.

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