What is the cheapest airline that flies from London to Idaho?

Lufthansa, Delta, and Alaska Airlines are the most popular carriers operating from London to Idaho

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

Prices for flights from London to Idaho refresh daily.

How old do you have to be to fly from London 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 London to Idaho.

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

The required travel and health documents for your Idaho trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Idaho. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

$455 Cheap Flights from London to Idaho in 2026

Find the cheapest flights from London to Idaho

Round-trip

One-way

Last minute

Cheap round-trip flights

Enter your travel dates to find the best prices.

7:40 am - 11:59 pm

LHR

BOI

23h 19m

2 stops

10:39 am - 7:30 am

BOI

LHR

37h 51m

2 stops

$836United Airlines

Wed, Nov 4 - Sun, Nov 8

7:40 am - 11:59 pm

LHR

BOI

23h 19m

2 stops

10:39 am - 7:30 am

BOI

LHR

37h 51m

2 stops

$838United Airlines

Wed, Nov 4 - Sun, Nov 8

10:35 am - 6:51 pm

LHR

GEG

16h 16m

1 stop

1:04 pm - 11:10 am

GEG

LHR

14h 06m

1 stop

$902Lufthansa

Tue, Sep 1 - Tue, Sep 8

2:50 pm - 8:46 pm

LHR

GEG

13h 56m

1 stop

1:09 pm - 7:25 am

GEG

LHR

34h 16m

1 stop

$950Lufthansa

Fri, Sep 4 - Fri, Sep 18

6:40 am - 7:14 pm

LHR

GEG

20h 34m

2 stops

1:00 pm - 4:25 pm

GEG

LHR

19h 25m

3 stops

$992Scandinavian Airlines

Tue, Sep 1 - Tue, Sep 8

9:05 pm - 5:00 pm

LHR

GEG

27h 55m

3 stops

11:10 am - 4:00 pm

GEG

LHR

20h 50m

2 stops

$993Scandinavian Airlines

Fri, Sep 4 - Fri, Sep 18

3:40 pm - 11:59 pm

LGW

GEG

16h 19m

2 stops

8:33 pm - 2:40 pm

GEG

LGW

34h 07m

2 stops

$1,003Icelandair

Fri, Sep 4 - Mon, Sep 7

10:20 am - 10:38 pm

LGW

BOI

19h 18m

2 stops

2:08 pm - 6:50 pm

BOI

LGW

21h 42m

2 stops

$1,030Multiple Airlines

Mon, Sep 21 - Mon, Oct 5

11:55 am - 10:25 pm

LGW

BOI

17h 30m

2 stops

12:49 pm - 10:55 am

BOI

LGW

15h 06m

2 stops

$1,088Multiple Airlines

Wed, Nov 11 - Sat, Nov 14

3:40 pm - 11:59 pm

LGW

GEG

40h 19m

2 stops

4:38 pm - 2:40 pm

GEG

LGW

38h 02m

2 stops

$1,203Icelandair

Wed, Sep 30 - Sun, Oct 4

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United Airlines flights from London to Idaho

Our best United Airlines deals on London to Idaho flight tickets

United Airlines

Nov 4

LHR7:40 amLondon Heathrow

23h 19m

2 stops

BOI11:59 pmBoise Air Term. Gowen Fld

Nov 8

BOI10:39 amBoise Air Term. Gowen Fld

37h 51m

2 stops

LHR7:30 amLondon Heathrow

$836

United Airlines

Nov 4

LHR7:40 amLondon Heathrow

23h 19m

2 stops

BOI11:59 pmBoise Air Term. Gowen Fld

Nov 8

BOI10:39 amBoise Air Term. Gowen Fld

37h 51m

2 stops

LHR7:30 amLondon Heathrow

$838

United Airlines

Sep 4

LHR1:05 pmLondon Heathrow

29h 25m

2 stops

GEG10:30 amSpokane

Sep 7

GEG12:40 pmSpokane

37h 00m

2 stops

LHR9:40 amLondon Heathrow

$876

Finnair flights from London to Idaho

Our best Finnair deals on London to Idaho flight tickets

Finnair

Jul 8

LHR2:25 pmLondon Heathrow

15h 56m

1 stop

BOI11:21 pmBoise Air Term. Gowen Fld

Aug 5

BOI6:44 amBoise Air Term. Gowen Fld

19h 16m

1 stop

LHR9:00 amLondon Heathrow

$1,037

Finnair

Jun 23

LHR2:25 pmLondon Heathrow

15h 03m

1 stop

BOI10:28 pmBoise Air Term. Gowen Fld

Jul 4

BOI3:12 pmBoise Air Term. Gowen Fld

12h 18m

1 stop

LHR10:30 amLondon Heathrow

$1,077

Finnair

Jun 23

LHR10:05 amLondon Heathrow

19h 23m

1 stop

BOI10:28 pmBoise Air Term. Gowen Fld

Jul 4

BOI3:12 pmBoise Air Term. Gowen Fld

12h 18m

1 stop

LHR10:30 amLondon Heathrow

$1,079

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

LondonBoise

LHR - BOI

LHRBOI

London Heathrow

Wed 11/4

7:40 am-11:59 pm

2 stops23h 19m

Boise Air Term. Gowen Fld

Sun 11/8

10:39 am-7:30 am

2 stops37h 51m

$836

LondonBoise

LHR - BOI

LHRBOI

London Heathrow

Wed 11/4

7:40 am-11:59 pm

2 stops23h 19m

Boise Air Term. Gowen Fld

Sun 11/8

10:39 am-7:30 am

2 stops37h 51m

$838

Quickest round-trip

LondonSpokane

LHR - GEG

LHRGEG

London Heathrow

Tue 9/1

10:35 am-6:51 pm

1 stop16h 16m

Spokane

Tue 9/8

1:04 pm-11:10 am

1 stop14h 06m

$902

LondonSpokane

LHR - GEG

LHRGEG

London Heathrow

Fri 9/4

2:50 pm-8:46 pm

1 stop13h 56m

Spokane

Fri 9/18

1:09 pm-7:25 am

1 stop34h 16m

$950

LondonSpokane

LHR - GEG

LHRGEG

London Heathrow

Tue 9/1

6:40 am-7:14 pm

2 stops20h 34m

Spokane

Tue 9/8

1:00 pm-4:25 pm

3 stops19h 25m

$992

LondonSpokane

LHR - GEG

LHRGEG

London Heathrow

Fri 9/4

9:05 pm-5:00 pm

3 stops27h 55m

Spokane

Fri 9/18

11:10 am-4:00 pm

2 stops20h 50m

$993

LondonSpokane

LGW - GEG

LGWGEG

London Gatwick

Fri 9/4

3:40 pm-11:59 pm

2 stops16h 19m

Spokane

Mon 9/7

8:33 pm-2:40 pm

2 stops34h 07m

$1,003

LondonBoise

LGW - BOI

LGWBOI

London Gatwick

Mon 9/21

10:20 am-10:38 pm

2 stops19h 18m

Boise Air Term. Gowen Fld

Mon 10/5

2:08 pm-6:50 pm

2 stops21h 42m

$1,030

LondonBoise

LGW - BOI

LGWBOI

London Gatwick

Wed 11/11

11:55 am-10:25 pm

2 stops17h 30m

Boise Air Term. Gowen Fld

Sat 11/14

12:49 pm-10:55 am

2 stops15h 06m

$1,088

LondonSpokane

LGW - GEG

LGWGEG

London Gatwick

Wed 9/30

3:40 pm-11:59 pm

2 stops40h 19m

Spokane

Sun 10/4

4:38 pm-2:40 pm

2 stops38h 02m

$1,203

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first

How to get the cheapest flight ticket from London 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

What is the cheapest month to fly to Idaho?

In general, January is the cheapest month to fly from London to Idaho. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $673. If you don’t want to visit Idaho in January, then you should wait until March to fly from London, when ticket prices are also cheap, with an average price of $682.

Can stopping save me money on London to Idaho flights?

You could potentially save up to 7% on your flight if you consider stops on a London to Idaho flight.

Cheap London to Idaho flight deals and tips

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

Fastest flight time	12h 29m
Direct flights	None

The fastest flight from London to Idaho takes 12h 29m

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

Search flight deals

Frequently asked questions about flying from London to Idaho

When did momondo last update prices for flights from London to Idaho?
Prices for flights from London to Idaho refresh daily.
How old do you have to be to fly from London 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 London to Idaho.
What documentation or ID do you need to fly to Idaho?
The required travel and health documents for your Idaho trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Idaho. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

Why use momondo?

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

It is quick and easy to find London to Idaho flights on momondo. We search and return numerous flight options from various airlines and agents. You can then use our filters to narrow your search until you have found the most convenient flight to Idaho that suits you.

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

Flights from London to Idaho with flexible booking policies can be found by using the search form above and then selecting our dedicated flexible booking filter, which will highlight only the flights where this policy is applied.

How can momondo help me find flights from London to Idaho?

momondo provides multiple filters to help you find the best flight to Idaho from London. Filter by price, airline, airports, cabin, aircraft, payment method, number of stops and more.

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

If you are not ready to book a flight from London to Idaho now, use our insights above to find helpful tips or alternatively set up a price alert, where momondo will track prices on flights to Idaho and let you know when they change.