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Cheap flights from Idaho to London from £291

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Idaho to London departing on 24/3. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
0 bags
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Find the cheapest flights from Idaho to London

Cheap return flights

Enter your travel dates to find the best prices.
United Airlines Logo
10:49 - 07:25
BOI
-
LHR
14h 36m
1 stop
United Airlines Logo
06:50 - 22:56
LHR
-
BOI
22h 06m
2 stops
£464United Airlines
Wed, 11 Mar - Mon, 16 Mar
United Airlines Logo
08:39 - 12:00
BOI
-
LHR
20h 21m
1 stop
United Airlines Logo
06:35 - 21:29
LHR
-
BOI
20h 54m
2 stops
£465United Airlines
Fri, 6 Mar - Fri, 13 Mar
United Airlines Logo
07:02 - 12:00
GEG
-
LHR
20h 58m
1 stop
United Airlines Logo
07:40 - 21:03
LHR
-
GEG
20h 23m
2 stops
£465United Airlines
Fri, 6 Mar - Mon, 9 Mar
Lufthansa Logo
14:37 - 16:40
BOI
-
LHR
19h 03m
2 stops
Lufthansa Logo
09:30 - 21:22
LHR
-
BOI
18h 52m
2 stops
£474Lufthansa
Wed, 15 Apr - Wed, 22 Apr
Scandinavian Airlines Logo
06:09 - 15:35
LWS
-
LHR
25h 26m
1 stop
Scandinavian Airlines Logo
09:55 - 00:08
LHR
-
LWS
22h 13m
2 stops
£475Scandinavian Airlines
Wed, 29 Apr - Wed, 6 May
KLM Logo
09:25 - 10:30
GEG
-
LHR
17h 05m
1 stop
KLM Logo
10:45 - 21:37
LHR
-
GEG
17h 52m
1 stop
£475KLM
Sat, 7 Mar - Fri, 20 Mar
Delta Logo
19:38 - 15:35
GEG
-
LHR
11h 57m
1 stop
Delta Logo
08:40 - 21:13
LHR
-
GEG
20h 33m
2 stops
£476Delta
Sun, 26 Apr - Fri, 15 May
KLM Logo
12:13 - 15:35
LWS
-
LHR
19h 22m
2 stops
KLM Logo
11:45 - 00:08
LHR
-
LWS
20h 23m
2 stops
£479KLM
Wed, 29 Apr - Wed, 6 May
Delta Logo
09:30 - 10:20
GEG
-
LHR
16h 50m
2 stops
Delta Logo
11:45 - 21:13
LHR
-
GEG
17h 28m
2 stops
£479Delta
Tue, 28 Apr - Fri, 15 May
Scandinavian Airlines Logo
07:05 - 16:50
BOI
-
LHR
27h 45m
1 stop
Scandinavian Airlines Logo
14:30 - 22:04
LHR
-
BOI
13h 34m
1 stop
£485Scandinavian Airlines
Wed, 11 Mar - Mon, 16 Mar

United Airlines flights from Idaho to London Heathrow Airport

Our best United Airlines deals on Idaho to London Heathrow Airport flight tickets
United Airlines
11 Mar
BOI10:49Boise Air Term. Gowen Fld
14h 36m
1 stop
LHR07:25London Heathrow
16 Mar
LHR06:50London Heathrow
22h 06m
2 stops
BOI22:56Boise Air Term. Gowen Fld
£464
United Airlines
6 Mar
GEG07:02Spokane
20h 58m
1 stop
LHR12:00London Heathrow
9 Mar
LHR07:40London Heathrow
20h 23m
2 stops
GEG21:03Spokane
£465
United Airlines
11 Mar
BOI05:00Boise Air Term. Gowen Fld
18h 55m
2 stops
LHR05:55London Heathrow
16 Mar
LHR07:40London Heathrow
40h 06m
2 stops
BOI17:46Boise Air Term. Gowen Fld
£467

Lufthansa flights from Idaho to London Heathrow Airport

Our best Lufthansa deals on Idaho to London Heathrow Airport flight tickets
Lufthansa
15 Apr
BOI14:37Boise Air Term. Gowen Fld
19h 03m
2 stops
LHR16:40London Heathrow
22 Apr
LHR09:30London Heathrow
18h 52m
2 stops
BOI21:22Boise Air Term. Gowen Fld
£474
Lufthansa
14 Apr
GEG12:35Spokane
26h 05m
2 stops
LHR22:40London Heathrow
25 Apr
LHR20:25London Heathrow
32h 46m
2 stops
GEG21:11Spokane
£500
Lufthansa
14 Apr
GEG12:35Spokane
24h 10m
2 stops
LHR20:45London Heathrow
25 Apr
LHR20:25London Heathrow
32h 46m
2 stops
GEG21:11Spokane
£501

momondo Fare Finder

 
Customise your flight search to find flights from Idaho to London Heathrow Airport 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, momondo users made 279,928 searches. Data last updated 9 February 2026.
Use the filters below to find and compare flights from Idaho to London Heathrow Airport that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

BoiseLondon

BOI - LHR

BOILHR

Boise Air Term. Gowen Fld

Wed 11/3

10:49-07:25

1 stop14h 36m

London Heathrow

Mon 16/3

06:50-22:56

2 stops22h 06m

£464

BoiseLondon

BOI - LHR

BOILHR

Boise Air Term. Gowen Fld

Fri 6/3

08:39-12:00

1 stop20h 21m

London Heathrow

Fri 13/3

06:35-21:29

2 stops20h 54m

£465

SpokaneLondon

GEG - LHR

GEGLHR

Spokane

Fri 6/3

07:02-12:00

1 stop20h 58m

London Heathrow

Mon 9/3

07:40-21:03

2 stops20h 23m

£465

BoiseLondon

BOI - LHR

BOILHR

Boise Air Term. Gowen Fld

Wed 15/4

14:37-16:40

2 stops19h 03m

London Heathrow

Wed 22/4

09:30-21:22

2 stops18h 52m

£474

LewistonLondon

LWS - LHR

LWSLHR

Lewiston Nez Perce Rgnl

Wed 29/4

06:09-15:35

1 stop25h 26m

London Heathrow

Wed 6/5

09:55-00:08

2 stops22h 13m

£475

SpokaneLondon

GEG - LHR

GEGLHR

Spokane

Sat 7/3

09:25-10:30

1 stop17h 05m

London Heathrow

Fri 20/3

10:45-21:37

1 stop17h 52m

£475

SpokaneLondon

GEG - LHR

GEGLHR

Spokane

Sun 26/4

19:38-15:35

1 stop11h 57m

London Heathrow

Fri 15/5

08:40-21:13

2 stops20h 33m

£476

LewistonLondon

LWS - LHR

LWSLHR

Lewiston Nez Perce Rgnl

Wed 29/4

12:13-15:35

2 stops19h 22m

London Heathrow

Wed 6/5

11:45-00:08

2 stops20h 23m

£479

SpokaneLondon

GEG - LHR

GEGLHR

Spokane

Tue 28/4

09:30-10:20

2 stops16h 50m

London Heathrow

Fri 15/5

11:45-21:13

2 stops17h 28m

£479

BoiseLondon

BOI - LHR

BOILHR

Boise Air Term. Gowen Fld

Wed 11/3

07:05-16:50

1 stop27h 45m

London Heathrow

Mon 16/3

14:30-22:04

1 stop13h 34m

£485

Flights are sorted by cheapest return flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to London from

How to get the cheapest flight ticket from Idaho to London Heathrow Airport

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

What is the cheapest month to fly to London Heathrow Airport?

In general, April is the cheapest month to fly from Idaho to London Heathrow Airport. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around £554. The month of August is another great option to travel to London Heathrow Airport, with average flight prices from Idaho averaging around £585.

Cheap Idaho to London Heathrow Airport flight deals and tips

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

Fastest flight time

11h 50m

Direct flights

None
The fastest flight from Idaho to London Heathrow Airport takes 11h 50m
There are no direct flights from Idaho to London Heathrow Airport. There are no popular flight routes from Idaho to London Heathrow Airport.
Search flight deals

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

    Prices for flights from Idaho to London Heathrow Airport are updated daily.

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

    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 Heathrow Airport.

  • What documentation or ID do you need to fly to London Heathrow Airport?

    The travel and health documents required for your trip to London Heathrow Airport 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 Heathrow Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

Travelling to a place near London?

Book flights to London if you plan to visit one of these locations
Eastbourne
Milton Keynes
Luton
Gatwick
Maidstone
Slough
Northampton
Stratford-upon-Avon
Swindon
Southend-on-Sea
Canterbury
Ipswich
Ilford
Poole
Guildford
Chelmsford
Hayes
Dover
Swanage
Folkestone

Why use momondo?

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

We help find the flight that best suits your needs, momondo compares prices from hundreds of airlines and travel agents and helps you filter them to find the best flight from Idaho to London for you.

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

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

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

Once all potential Idaho to London flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.

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

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

An easier way to manage your London Heathrow Airport trip

We make it super easy to schedule, organise and travel with friends or family. Trips is free – and available to use no matter where you book.
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