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

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

How long does it take to fly to London?

Flight times from Idaho to London vary, but if you’re flying out of Boise and flying into London Heathrow Airport (one of the most popular routes), then the duration is 12h 52m on average. Another popular route from Idaho to London is flying from Lewiston to London Heathrow Airport, which will take roughly 13h 30m. Keep in mind that layovers or delays could extend your travel time.

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

Prices for flights from Idaho to London are updated daily.

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

As of September 2025, there is 1 operator available to choose from for flights from Idaho to London.

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

The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Idaho to London.

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

The travel and health documents required for your trip to London can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at London. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

£207 Cheap Flights from Idaho to London in 2025/26

1 adult

0 bags

Discover deals from 900+ travel sites with momondo.

Voted winner of Europe's Best Travel App 2023

Save money when you book flights with momondo

Big names, great deals

Search 100s of travel sites to compare prices.

Filter for what you want

Free Wi-Fi? Stopover? Instantly customise your results.

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Not ready to book? to track prices.

Search flight deals

Find the cheapest flights from Idaho to London

Round-trip

One-way

Last minute

Cheap return flights

15:54 - 18:30BOI-LHR

19h 36m2 stops

06:40 - 22:39LHR-BOI

22h 59m2 stops

£448Scandinavian Airlines

Find Deal

Thu, 13 Nov - Tue, 18 Nov

15:54 - 21:20BOI-LHR

22h 26m3 stops

06:40 - 22:39LHR-BOI

22h 59m2 stops

£451Scandinavian Airlines

Find Deal

Thu, 13 Nov - Tue, 18 Nov

13:52 - 10:55GEG-LGW

37h 03m1 stop

10:55 - 13:12LGW-GEG

34h 17m1 stop

£501Multiple Airlines

Find Deal

Tue, 21 Oct - Fri, 24 Oct

12:51 - 11:10GEG-LHR

14h 19m1 stop

06:30 - 14:57LHR-GEG

16h 27m2 stops

£531KLM

Find Deal

Sun, 19 Oct - Tue, 4 Nov

18:53 - 09:50IDA-LHR

31h 57m1 stop

20:25 - 18:13LHR-IDA

28h 48m2 stops

£535KLM

Find Deal

Sun, 19 Oct - Tue, 4 Nov

11:20 - 12:50GEG-LHR

18h 30m1 stop

06:30 - 19:46LHR-GEG

21h 16m2 stops

£536Delta

Find Deal

Tue, 28 Oct - Thu, 6 Nov

13:43 - 11:40BOI-LHR

14h 57m1 stop

12:20 - 18:25LHR-BOI

13h 05m1 stop

£538Virgin Atlantic

Find Deal

Tue, 17 Feb - Thu, 26 Feb

11:42 - 10:30BOI-LHR

15h 48m1 stop

06:20 - 20:20LHR-BOI

21h 00m2 stops

£540Delta

Find Deal

Sun, 16 Nov - Wed, 10 Dec

11:42 - 10:30BOI-LHR

15h 48m1 stop

09:00 - 22:36LHR-BOI

20h 36m2 stops

£540Multiple Airlines

Find Deal

Mon, 17 Nov - Fri, 12 Dec

14:00 - 11:20BOI-LHR

14h 20m1 stop

20:00 - 20:16LHR-BOI

30h 16m2 stops

£578Virgin Atlantic

Find Deal

Thu, 23 Oct - Thu, 30 Oct

KLM flights from Idaho to London

Our best KLM deals on Idaho to London flight tickets

KLM

19 Oct

GEG12:51Spokane

14h 19m

1 stop

LHR11:10London Heathrow

4 Nov

LHR06:30London Heathrow

16h 27m

2 stops

GEG14:57Spokane

£531

Find similar

KLM

19 Oct

IDA18:53Idaho Falls Fanning Field

31h 57m

1 stop

LHR09:50London Heathrow

4 Nov

LHR20:25London Heathrow

28h 48m

2 stops

IDA18:13Idaho Falls Fanning Field

£535

Find similar

KLM

5 Jan

LWS12:30Lewiston Nez Perce Rgnl

13h 30m

1 stop

LHR10:00London Heathrow

10 Mar

LHR06:30London Heathrow

21h 32m

2 stops

LWS21:02Lewiston Nez Perce Rgnl

£546

Find similar

Air Canada flights from Idaho to London

Our best Air Canada deals on Idaho to London flight tickets

Air Canada

22 Oct

BOI14:44Boise Air Term. Gowen Fld

15h 36m

2 stops

LHR13:20London Heathrow

29 Oct

LHR14:30London Heathrow

29h 14m

2 stops

BOI13:44Boise Air Term. Gowen Fld

£541

Find similar

Air Canada

15 Nov

BOI19:00Boise Air Term. Gowen Fld

33h 50m

2 stops

LHR11:50London Heathrow

9 Dec

LHR14:30London Heathrow

35h 44m

2 stops

BOI19:14Boise Air Term. Gowen Fld

£544

Find similar

Air Canada

15 Nov

BOI19:00Boise Air Term. Gowen Fld

33h 50m

2 stops

LHR11:50London Heathrow

10 Dec

LHR13:00London Heathrow

39h 25m

2 stops

BOI21:25Boise Air Term. Gowen Fld

£545

Find similar

Fly from

Fly to

Route

Depart

Return

Price

BoiseLondon

BOI - LHR

BOILHR

Boise Air Term. Gowen Fld

Thu 13/11

15:54-18:30

2 stops19h 36m

London Heathrow

Tue 18/11

06:40-22:39

2 stops22h 59m

£448

BoiseLondon

BOI - LHR

BOILHR

Boise Air Term. Gowen Fld

Thu 13/11

15:54-21:20

3 stops22h 26m

London Heathrow

Tue 18/11

06:40-22:39

2 stops22h 59m

£451

SpokaneLondon

GEG - LGW

GEGLGW

Spokane

Tue 21/10

13:52-10:55

1 stop37h 03m

London Gatwick

Fri 24/10

10:55-13:12

1 stop34h 17m

£501

SpokaneLondon

GEG - LHR

GEGLHR

Spokane

Sun 19/10

12:51-11:10

1 stop14h 19m

London Heathrow

Tue 4/11

06:30-14:57

2 stops16h 27m

£531

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Sun 19/10

18:53-09:50

1 stop31h 57m

London Heathrow

Tue 4/11

20:25-18:13

2 stops28h 48m

£535

SpokaneLondon

GEG - LHR

GEGLHR

Spokane

Tue 28/10

11:20-12:50

1 stop18h 30m

London Heathrow

Thu 6/11

06:30-19:46

2 stops21h 16m

£536

BoiseLondon

BOI - LHR

BOILHR

Boise Air Term. Gowen Fld

Tue 17/2

13:43-11:40

1 stop14h 57m

London Heathrow

Thu 26/2

12:20-18:25

1 stop13h 05m

£538

BoiseLondon

BOI - LHR

BOILHR

Boise Air Term. Gowen Fld

Sun 16/11

11:42-10:30

1 stop15h 48m

London Heathrow

Wed 10/12

06:20-20:20

2 stops21h 00m

£540

BoiseLondon

BOI - LHR

BOILHR

Boise Air Term. Gowen Fld

Mon 17/11

11:42-10:30

1 stop15h 48m

London Heathrow

Fri 12/12

09:00-22:36

2 stops20h 36m

£540

BoiseLondon

BOI - LHR

BOILHR

Boise Air Term. Gowen Fld

Thu 23/10

14:00-11:20

1 stop14h 20m

London Heathrow

Thu 30/10

20:00-20:16

2 stops30h 16m

£578

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 Idaho to London

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 London?

The cheapest month to fly to London from Idaho is in October. Flight prices, which tend to average around £525, are often lower during this time because this is during the off-season. The month of February is another great option to travel to London, with average flight prices from Idaho averaging around £585.

What is the cheapest time of day to depart on your flight to London?

The cheapest time of day to fly to London is at midday when flights can be purchased for as low as £529. Flights in the afternoon are often more expensive, with an average ticket price of £604.

How far in advance should I book a flight to London?

You are more likely to see cheaper flights to London from Idaho when booking weeks ahead of your departure date. In general, you can expect to find flights to London for around £721 when searching weeks before you fly. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to London from Idaho for as low as £510 on momondo.

Cheap Idaho to London flight deals and tips

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

Direct flights	None

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

Search flight deals

When did momondo last update prices for flights from Idaho to London?
Prices for flights from Idaho to London are updated daily.
How many operators does momondo search for flights from Idaho to London?
As of September 2025, there is 1 operator available to choose from for flights from Idaho to London.
How old do you have to be to fly from Idaho to London?
The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Idaho to London.
What documentation or ID do you need to fly to London?
The travel and health documents required for your trip to London can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at London. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

Best airlines flying from Idaho to London

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

Airline	Rating	Free Cancellation	Price
Virgin Atlantic	PriceFrom £478	Free Cancellation	Rating 7.4 664 reviews		Search Virgin Atlantic flights

Eastbourne

Luton

Milton Keynes

Maidstone

Gatwick

Slough

Canterbury

Southend-on-Sea

Ipswich

Ilford

Guildford

Colchester

Worthing

Chelmsford

Dover

Hayes

Dartford

Stansted

Hounslow

Chichester

Why use momondo?

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

It is quick and easy to find Idaho to London 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 London that suits you.

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

Yes. momondo enables you to select and highlight flights to London from Idaho with this policy.

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

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 Idaho to London.

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

Yes momondo offers price alerts on flights to London from Idaho. After performing a search on this page you should be able to see the price alert set up feature. Simply provide a valid email address and momondo will instantly alert you when prices change.