What is the cheapest airline that flies from United Kingdom to Idaho?

United Airlines, Icelandair, and Lufthansa are the most popular carriers operating from United Kingdom to Idaho

Which airlines fly to Idaho?

United Airlines, Virgin Atlantic and KLM are the top three most popular airlines that fly to Idaho from United Kingdom according to our data. United Airlines is the first choice among our users, with 43% of people opting to fly with this airline when travelling to Idaho. Keep in mind that there are 7 different airlines that fly to Idaho on a routine basis, so you have a few additional options to choose from.

How long is the flight from United Kingdom to Idaho?

Flight times from United Kingdom to Idaho vary, but if you’re flying out of London and flying into Boise (one of the most popular routes), then the duration is 17h 18m on average. Another popular route from United Kingdom to Idaho is flying from Birmingham to Boise, which will take roughly 20h 08m. Keep in mind that layovers or delays could extend your travel time.

When did momondo last update prices for flights from United Kingdom to Idaho?

Prices for flights from United Kingdom to Idaho are updated daily.

How many operators does momondo search for flights from United Kingdom to Idaho?

There are 7 operators available for flights from United Kingdom to Idaho as of April 2026.

How old do you have to be to fly from United Kingdom to Idaho?

The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from United Kingdom to Idaho.

What documentation or ID do you need to fly to Idaho?

The necessary travel and health documents for your Idaho trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

£381 Cheap Flights from the United Kingdom to Idaho in 2026

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Find the cheapest flights from the United Kingdom to Idaho

Round-trip

One-way

Last minute

Recent return flight deals from the United Kingdom to Idaho

Enter your travel dates to find the best prices.

10:50 - 23:50

LHR

BOI

20h 00m

2 stops

19:01 - 07:25

BOI

LHR

29h 24m

1 stop

£655United Airlines

Wed, 16 Sep - Sun, 20 Sep

10:50 - 23:50

LHR

BOI

20h 00m

2 stops

10:37 - 07:45

BOI

LHR

38h 08m

2 stops

£656United Airlines

Wed, 16 Sep - Sun, 20 Sep

14:50 - 21:16

LHR

BOI

13h 26m

1 stop

10:39 - 09:40

BOI

LHR

16h 01m

1 stop

£711Lufthansa

Fri, 9 Oct - Fri, 23 Oct

19:15 - 18:23

LHR

GEG

31h 08m

2 stops

16:15 - 12:10

GEG

LHR

11h 55m

1 stop

£726Virgin Atlantic

Mon, 4 May - Mon, 18 May

11:40 - 18:57

LHR

GEG

15h 17m

1 stop

14:16 - 13:05

GEG

LHR

14h 49m

1 stop

£740Virgin Atlantic

Mon, 4 May - Mon, 18 May

13:05 - 22:56

LHR

IDA

16h 51m

2 stops

06:18 - 11:55

IDA

LHR

22h 37m

2 stops

£796Icelandair

Tue, 1 Sep - Fri, 25 Sep

13:05 - 22:56

LHR

IDA

40h 51m

2 stops

13:45 - 20:20

IDA

LHR

23h 35m

2 stops

£801Icelandair

Tue, 1 Sep - Fri, 25 Sep

09:20 - 23:00

LCY

BOI

20h 40m

2 stops

18:41 - 18:30

BOI

LCY

16h 49m

2 stops

£845KLM

Tue, 5 May - Wed, 13 May

07:00 - 18:51

MAN

GEG

19h 51m

2 stops

12:25 - 23:15

GEG

MAN

26h 50m

2 stops

£851Lufthansa

Wed, 29 Apr - Mon, 18 May

20:15 - 16:13

LCY

JAC

26h 58m

2 stops

17:59 - 16:40

JAC

LCY

15h 41m

2 stops

£966KLM

Tue, 5 May - Wed, 13 May

Alaska Airlines flights from United Kingdom to Idaho

Our best Alaska Airlines deals on United Kingdom to Idaho flight tickets

Alaska Airlines

22 Jun

LHR17:00London Heathrow

14h 04m

1 stop

BOI00:04Boise Air Term. Gowen Fld

29 Jun

BOI18:13Boise Air Term. Gowen Fld

13h 52m

1 stop

LHR15:05London Heathrow

£821

Alaska Airlines

9 Jun

LHR17:00London Heathrow

29h 37m

1 stop

IDA15:37Idaho Falls Fanning Field

16 Jun

IDA07:15Idaho Falls Fanning Field

24h 50m

1 stop

LHR15:05London Heathrow

£889

Lufthansa flights from United Kingdom to Idaho

Our best Lufthansa deals on United Kingdom to Idaho flight tickets

Lufthansa

9 Oct

LHR14:50London Heathrow

13h 26m

1 stop

BOI21:16Boise Air Term. Gowen Fld

23 Oct

BOI10:39Boise Air Term. Gowen Fld

16h 01m

1 stop

LHR09:40London Heathrow

£711

Lufthansa

27 May

LHR11:25London Heathrow

13h 31m

1 stop

BOI17:56Boise Air Term. Gowen Fld

3 Jun

BOI14:40Boise Air Term. Gowen Fld

14h 55m

1 stop

LHR12:35London Heathrow

£780

Lufthansa

23 Jun

LHR11:25London Heathrow

13h 31m

1 stop

BOI17:56Boise Air Term. Gowen Fld

4 Jul

BOI05:00Boise Air Term. Gowen Fld

18h 30m

2 stops

LHR06:30London Heathrow

£793

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

LondonBoise

LHR - BOI

LHRBOI

London Heathrow

Wed 16/9

10:50-23:50

2 stops20h 00m

Boise Air Term. Gowen Fld

Sun 20/9

19:01-07:25

1 stop29h 24m

£655

LondonBoise

LHR - BOI

LHRBOI

London Heathrow

Wed 16/9

10:50-23:50

2 stops20h 00m

Boise Air Term. Gowen Fld

Sun 20/9

10:37-07:45

2 stops38h 08m

£656

Fastest return journey

LondonBoise

LHR - BOI

LHRBOI

London Heathrow

Fri 9/10

14:50-21:16

1 stop13h 26m

Boise Air Term. Gowen Fld

Fri 23/10

10:39-09:40

1 stop16h 01m

£711

LondonSpokane

LHR - GEG

LHRGEG

London Heathrow

Mon 4/5

19:15-18:23

2 stops31h 08m

Spokane

Mon 18/5

16:15-12:10

1 stop11h 55m

£726

LondonSpokane

LHR - GEG

LHRGEG

London Heathrow

Mon 4/5

11:40-18:57

1 stop15h 17m

Spokane

Mon 18/5

14:16-13:05

1 stop14h 49m

£740

LondonIdaho Falls

LHR - IDA

LHRIDA

London Heathrow

Tue 1/9

13:05-22:56

2 stops16h 51m

Idaho Falls Fanning Field

Fri 25/9

06:18-11:55

2 stops22h 37m

£796

LondonIdaho Falls

LHR - IDA

LHRIDA

London Heathrow

Tue 1/9

13:05-22:56

2 stops40h 51m

Idaho Falls Fanning Field

Fri 25/9

13:45-20:20

2 stops23h 35m

£801

LondonBoise

LCY - BOI

LCYBOI

London City

Tue 5/5

09:20-23:00

2 stops20h 40m

Boise Air Term. Gowen Fld

Wed 13/5

18:41-18:30

2 stops16h 49m

£845

ManchesterSpokane

MAN - GEG

MANGEG

Manchester

Wed 29/4

07:00-18:51

2 stops19h 51m

Spokane

Mon 18/5

12:25-23:15

2 stops26h 50m

£851

LondonJackson

LCY - JAC

LCYJAC

London City

Tue 5/5

20:15-16:13

2 stops26h 58m

Jackson Hole

Wed 13/5

17:59-16:40

2 stops15h 41m

£966

Flights are sorted by cheapest return flights first.

Showing 1-10 of 20 resultsSorted by cheapest first

How to get the cheapest flight ticket from United Kingdom to Idaho

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

Prices

Airlines

Other information

What is the cheapest month to fly to Idaho?

The month of January is, on average, the cheapest month to fly to Idaho from United Kingdom, with most prices found around £565. If you’re not able to fly to Idaho in January, then September is your next best option. Flight prices from United Kingdom to Idaho during September average around £597.

Can stopping save me money on United Kingdom to Idaho flights?

You could potentially save up to 11% on your flight if you consider stops on a United Kingdom to Idaho flight.

Cheap United Kingdom to Idaho flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from United Kingdom to Idaho

Fastest flight time	13h 08m
Direct flights	None

The fastest flight from United Kingdom to Idaho takes 13h 08m

There are no direct flights from United Kingdom to Idaho. There are no popular flight routes from United Kingdom to Idaho.

Search flight deals

Frequently asked questions about flying from the United Kingdom to Idaho

When did momondo last update prices for flights from United Kingdom to Idaho?
Prices for flights from United Kingdom to Idaho are updated daily.
How many operators does momondo search for flights from United Kingdom to Idaho?
There are 7 operators available for flights from United Kingdom to Idaho as of April 2026.
How old do you have to be to fly from United Kingdom to Idaho?
The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from United Kingdom to Idaho.
What documentation or ID do you need to fly to Idaho?
The necessary travel and health documents for your Idaho trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

Best airlines flying from United Kingdom to Idaho

Compare and see reviews for airlines that fly from United Kingdom to Idaho with momondo

Airline	Rating	Free Cancellation	Price
United Airlines	PriceFrom £465	Free Cancellation	Rating 7.4 9,602 reviews	Search United Airlines flights
Lufthansa	PriceFrom £503	Free Cancellation	Rating 6.8 7,926 reviews	Search Lufthansa flights
Virgin Atlantic	PriceFrom £594	Free Cancellation	Rating 7.5 687 reviews	Search Virgin Atlantic flights
Scandinavian Airlines	PriceFrom £597	Free Cancellation	Rating 7.3 1,750 reviews	Search Scandinavian Airlines flights
Icelandair	PriceFrom £694	Free Cancellation	Rating 7.0 634 reviews	Search Icelandair flights
KLM	PriceFrom £694	Free Cancellation	Rating 7.8 1,499 reviews	Search KLM flights
Delta	PriceFrom £789	Free Cancellation	Rating 7.9 8,409 reviews	Search Delta flights

Why use momondo?

Why should I use momondo to find a flight deal from United Kingdom to Idaho?

momondo collates all your flight options in one place and lets you filter them to find the perfect flight from United Kingdom to Idaho. momondo saves you time and could save you money on your trip.

Can I find flights from United Kingdom to Idaho with flexible booking policies on momondo?

momondo does allow users to show only those flights to Idaho from United Kingdom which offer a flexible booking policy as well as other useful filters and features.

How can momondo help me find flights from United Kingdom to Idaho?

momondo offers useful filters to help you find the right flight. Choose specific flight times, airports or even what payment method you prefer. We have numerous options to help you book your ideal flight from United Kingdom to Idaho.

I’m not ready to book a flight from United Kingdom to Idaho right now. Can momondo alert me if prices change?

Yes. momondo can track prices for United Kingdom to Idaho flights and alert you when they change. Perform a search to set up the price alert. All that is required is a valid email address.