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Cheap flights from Idaho to London from £245

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 15/9. 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
06:20 - 11:15
BOI
-
LHR
21h 55m
1 stop
United Airlines Logo
06:50 - 23:06
LHR
-
BOI
23h 16m
2 stops
£555United Airlines
Tue, 10 Nov - Thu, 12 Nov
United Airlines Logo
11:30 - 12:00
GEG
-
LHR
16h 30m
1 stop
United Airlines Logo
06:35 - 21:09
LHR
-
GEG
22h 34m
2 stops
£556United Airlines
Tue, 10 Nov - Thu, 12 Nov
Lufthansa Logo
12:50 - 07:25
GEG
-
LHR
34h 35m
1 stop
Lufthansa Logo
07:25 - 10:30
LHR
-
GEG
35h 05m
2 stops
£602Lufthansa
Tue, 13 Oct - Fri, 16 Oct
Delta Logo
06:25 - 15:35
LWS
-
LHR
25h 10m
1 stop
Delta Logo
09:55 - 22:50
LHR
-
LWS
20h 55m
2 stops
£651Delta
Sun, 13 Sep - Fri, 25 Sep
Virgin Atlantic Logo
14:02 - 13:15
BOI
-
LHR
16h 13m
1 stop
Virgin Atlantic Logo
06:30 - 17:52
LHR
-
BOI
18h 22m
2 stops
£651Virgin Atlantic
Tue, 18 Aug - Thu, 27 Aug
Delta Logo
15:25 - 13:05
BOI
-
LHR
14h 40m
1 stop
Delta Logo
06:30 - 18:33
LHR
-
BOI
19h 03m
2 stops
£652Delta
Tue, 29 Sep - Wed, 7 Oct
Multiple Airlines Logo
05:00 - 06:30
BOI
-
LHR
18h 30m
2 stops
Multiple Airlines Logo
07:25 - 21:31
LHR
-
BOI
21h 06m
2 stops
£654Multiple Airlines
Tue, 13 Oct - Tue, 20 Oct
Lufthansa Logo
13:37 - 17:55
GEG
-
LCY
20h 18m
2 stops
Lufthansa Logo
09:50 - 21:09
LCY
-
GEG
19h 19m
2 stops
£677Lufthansa
Mon, 5 Oct - Thu, 28 Jan
Multiple Airlines Logo
14:08 - 18:50
BOI
-
LGW
21h 42m
2 stops
Multiple Airlines Logo
10:20 - 23:58
LGW
-
BOI
20h 38m
2 stops
£720Multiple Airlines
Tue, 13 Oct - Tue, 20 Oct
Virgin Atlantic Logo
07:00 - 08:50
JAC
-
LCY
18h 50m
2 stops
Virgin Atlantic Logo
07:45 - 20:29
LCY
-
JAC
19h 44m
2 stops
£1,186Virgin Atlantic
Tue, 7 Jul - Fri, 24 Jul

Air Canada flights from Idaho to London

Our best Air Canada deals on Idaho to London flight tickets
Air Canada
15 Sept
GEG13:37Spokane
35h 58m
2 stops
LHR09:35London Heathrow
25 Sept
LHR15:05London Heathrow
39h 11m
2 stops
GEG22:16Spokane
£662
Air Canada
11 Aug
GEG13:37Spokane
36h 23m
2 stops
LHR10:00London Heathrow
28 Aug
LHR15:05London Heathrow
35h 46m
2 stops
GEG18:51Spokane
£662
Air Canada
18 Sept
GEG13:37Spokane
58h 58m
2 stops
LHR08:35London Heathrow
25 Sept
LHR15:05London Heathrow
39h 11m
2 stops
GEG22:16Spokane
£665

United Airlines flights from Idaho to London

Our best United Airlines deals on Idaho to London flight tickets
United Airlines
10 Nov
BOI06:20Boise Air Term. Gowen Fld
21h 55m
1 stop
LHR11:15London Heathrow
12 Nov
LHR06:50London Heathrow
23h 16m
2 stops
BOI23:06Boise Air Term. Gowen Fld
£555
United Airlines
10 Nov
GEG11:30Spokane
16h 30m
1 stop
LHR12:00London Heathrow
12 Nov
LHR06:35London Heathrow
22h 34m
2 stops
GEG21:09Spokane
£556
United Airlines
10 Nov
GEG11:30Spokane
16h 30m
1 stop
LHR12:00London Heathrow
12 Nov
LHR06:35London Heathrow
22h 34m
2 stops
GEG21:09Spokane
£557

momondo Fare Finder

 
Customise your flight search to find flights from Idaho to London 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 15 May 2026.
Use the filters below to find and compare flights from Idaho to London that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

BoiseLondon

BOI - LHR

BOILHR

Boise Air Term. Gowen Fld

Tue 10/11

06:20-11:15

1 stop21h 55m

London Heathrow

Thu 12/11

06:50-23:06

2 stops23h 16m

£555

SpokaneLondon

GEG - LHR

GEGLHR

Spokane

Tue 10/11

11:30-12:00

1 stop16h 30m

London Heathrow

Thu 12/11

06:35-21:09

2 stops22h 34m

£556

SpokaneLondon

GEG - LHR

GEGLHR

Spokane

Tue 13/10

12:50-07:25

1 stop34h 35m

London Heathrow

Fri 16/10

07:25-10:30

2 stops35h 05m

£602

LewistonLondon

LWS - LHR

LWSLHR

Lewiston Nez Perce Rgnl

Sun 13/9

06:25-15:35

1 stop25h 10m

London Heathrow

Fri 25/9

09:55-22:50

2 stops20h 55m

£651

BoiseLondon

BOI - LHR

BOILHR

Boise Air Term. Gowen Fld

Tue 18/8

14:02-13:15

1 stop16h 13m

London Heathrow

Thu 27/8

06:30-17:52

2 stops18h 22m

£651
Fastest return journey

BoiseLondon

BOI - LHR

BOILHR

Boise Air Term. Gowen Fld

Tue 29/9

15:25-13:05

1 stop14h 40m

London Heathrow

Wed 7/10

06:30-18:33

2 stops19h 03m

£652

BoiseLondon

BOI - LHR

BOILHR

Boise Air Term. Gowen Fld

Tue 13/10

05:00-06:30

2 stops18h 30m

London Heathrow

Tue 20/10

07:25-21:31

2 stops21h 06m

£654

SpokaneLondon

GEG - LCY

GEGLCY

Spokane

Mon 5/10

13:37-17:55

2 stops20h 18m

London City

Thu 28/1

09:50-21:09

2 stops19h 19m

£677

BoiseLondon

BOI - LGW

BOILGW

Boise Air Term. Gowen Fld

Tue 13/10

14:08-18:50

2 stops21h 42m

London Gatwick

Tue 20/10

10:20-23:58

2 stops20h 38m

£720

JacksonLondon

JAC - LCY

JACLCY

Jackson Hole

Tue 7/7

07:00-08:50

2 stops18h 50m

London City

Fri 24/7

07:45-20:29

2 stops19h 44m

£1,186

Flights are sorted by cheapest return flights first.

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

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

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 £296, are often lower during this time because this is during the off-season. The month of November is another great option to travel to London, with average flight prices from Idaho averaging around £406.

Cheap Idaho to London flight deals and tips

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

Fastest flight time

12h 17m

Direct flights

None
The fastest flight from Idaho to London takes 12h 17m
There are no direct flights from Idaho to London. There are no popular flight routes from Idaho to London.
Search flight deals

Frequently asked questions about flying from Idaho to London

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

    Prices for flights from Idaho to London are updated daily.

  • 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.

Travelling to a place near London?

Book flights to London if you plan to visit one of these locations
Eastbourne
Milton Keynes
Luton
Gatwick
Wembley
Slough
Maidstone
Ipswich
Southend-on-Sea
Canterbury
Ilford
Hayes
Guildford
Folkestone
Chelmsford
Dover
Bedford
Chichester
Harlow
Colchester

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.

An easier way to manage your London 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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Find better results for your trip to the United Kingdom

Fly into one of these airports located in London

Airports listed have a maximum distance of 35.6 mi from London
London City Airport
London Gatwick Airport
London Heathrow Airport
London Luton Airport
London Southend Airport
London Stansted Airport