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Cheap flights from Idaho to London from $357

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 3/10. 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 round-trip flights

Enter your travel dates to find the best prices.
United Airlines Logo
10:49 am - 7:25 am
BOI
-
LHR
14h 36m
1 stop
United Airlines Logo
6:50 am - 10:56 pm
LHR
-
BOI
22h 06m
2 stops
$632United Airlines
Wed, Mar 11 - Mon, Mar 16
United Airlines Logo
5:00 am - 5:55 am
BOI
-
LHR
18h 55m
2 stops
United Airlines Logo
7:40 am - 5:46 pm
LHR
-
BOI
40h 06m
2 stops
$636United Airlines
Wed, Mar 11 - Mon, Mar 16
United Airlines Logo
6:00 am - 7:55 am
GEG
-
LHR
18h 55m
1 stop
United Airlines Logo
4:40 pm - 12:41 pm
LHR
-
GEG
51h 01m
2 stops
$643United Airlines
Sun, Mar 8 - Sun, Mar 15
Lufthansa Logo
2:37 pm - 5:40 pm
BOI
-
LHR
20h 03m
2 stops
Lufthansa Logo
7:30 am - 9:22 pm
LHR
-
BOI
20h 52m
2 stops
$646Lufthansa
Wed, Apr 15 - Wed, Apr 22
Scandinavian Airlines Logo
6:09 am - 3:35 pm
LWS
-
LHR
25h 26m
1 stop
Scandinavian Airlines Logo
9:55 am - 12:08 am
LHR
-
LWS
22h 13m
2 stops
$647Scandinavian Airlines
Wed, Apr 29 - Wed, May 6
Delta Logo
7:05 am - 10:15 am
BOI
-
LHR
20h 10m
1 stop
Delta Logo
6:30 am - 4:14 pm
LHR
-
BOI
16h 44m
2 stops
$648Delta
Sun, Apr 5 - Tue, Apr 21
Delta Logo
7:38 pm - 3:35 pm
GEG
-
LHR
11h 57m
1 stop
Delta Logo
8:40 am - 9:13 pm
LHR
-
GEG
20h 33m
2 stops
$648Delta
Sun, Apr 26 - Fri, May 15
Air Canada Logo
6:00 am - 11:20 am
GEG
-
LHR
22h 20m
2 stops
Air Canada Logo
1:25 pm - 9:59 pm
LHR
-
GEG
39h 34m
2 stops
$649Air Canada
Sun, Mar 8 - Sun, Mar 15
Air Canada Logo
7:10 am - 8:35 am
GEG
-
LHR
17h 25m
2 stops
Air Canada Logo
2:05 pm - 6:36 pm
LHR
-
GEG
36h 31m
2 stops
$657Air Canada
Wed, Apr 22 - Fri, May 8
Scandinavian Airlines Logo
7:05 am - 4:50 pm
BOI
-
LHR
27h 45m
1 stop
Scandinavian Airlines Logo
2:30 pm - 10:04 pm
LHR
-
BOI
13h 34m
1 stop
$660Scandinavian Airlines
Wed, Mar 11 - Mon, Mar 16

Air Canada flights from Idaho to London Heathrow Airport

Our best Air Canada deals on Idaho to London Heathrow Airport flight tickets
Air Canada
Mar 8
GEG6:00 amSpokane
22h 20m
2 stops
LHR11:20 amLondon Heathrow
Mar 15
LHR1:25 pmLondon Heathrow
39h 34m
2 stops
GEG9:59 pmSpokane
$649
Air Canada
Apr 22
GEG7:10 amSpokane
17h 25m
2 stops
LHR8:35 amLondon Heathrow
May 8
LHR2:05 pmLondon Heathrow
36h 31m
2 stops
GEG6:36 pmSpokane
$657
Air Canada
Apr 25
GEG7:10 amSpokane
39h 20m
2 stops
LHR6:30 amLondon Heathrow
May 8
LHR2:05 pmLondon Heathrow
36h 31m
2 stops
GEG6:36 pmSpokane
$660

Lufthansa flights from Idaho to London Heathrow Airport

Our best Lufthansa deals on Idaho to London Heathrow Airport flight tickets
Lufthansa
Apr 15
BOI2:37 pmBoise Air Term. Gowen Fld
20h 03m
2 stops
LHR5:40 pmLondon Heathrow
Apr 22
LHR7:30 amLondon Heathrow
20h 52m
2 stops
BOI9:22 pmBoise Air Term. Gowen Fld
$646
Lufthansa
Apr 21
BOI2:37 pmBoise Air Term. Gowen Fld
20h 03m
2 stops
LHR5:40 pmLondon Heathrow
Apr 28
LHR6:55 amLondon Heathrow
21h 27m
2 stops
BOI9:22 pmBoise Air Term. Gowen Fld
$679
Lufthansa
Apr 14
GEG12:35 pmSpokane
23h 05m
2 stops
LHR7:40 pmLondon Heathrow
Apr 25
LHR8:25 pmLondon Heathrow
32h 46m
2 stops
GEG9:11 pmSpokane
$681

momondo Fare Finder

 
Customize 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 832,500 searches. Data last updated February 11, 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 3/11

10:49 am-7:25 am

1 stop14h 36m

London Heathrow

Mon 3/16

6:50 am-10:56 pm

2 stops22h 06m

$632

BoiseLondon

BOI - LHR

BOILHR

Boise Air Term. Gowen Fld

Wed 3/11

5:00 am-5:55 am

2 stops18h 55m

London Heathrow

Mon 3/16

7:40 am-5:46 pm

2 stops40h 06m

$636

SpokaneLondon

GEG - LHR

GEGLHR

Spokane

Sun 3/8

6:00 am-7:55 am

1 stop18h 55m

London Heathrow

Sun 3/15

4:40 pm-12:41 pm

2 stops51h 01m

$643

BoiseLondon

BOI - LHR

BOILHR

Boise Air Term. Gowen Fld

Wed 4/15

2:37 pm-5:40 pm

2 stops20h 03m

London Heathrow

Wed 4/22

7:30 am-9:22 pm

2 stops20h 52m

$646

LewistonLondon

LWS - LHR

LWSLHR

Lewiston Nez Perce Rgnl

Wed 4/29

6:09 am-3:35 pm

1 stop25h 26m

London Heathrow

Wed 5/6

9:55 am-12:08 am

2 stops22h 13m

$647

BoiseLondon

BOI - LHR

BOILHR

Boise Air Term. Gowen Fld

Sun 4/5

7:05 am-10:15 am

1 stop20h 10m

London Heathrow

Tue 4/21

6:30 am-4:14 pm

2 stops16h 44m

$648

SpokaneLondon

GEG - LHR

GEGLHR

Spokane

Sun 4/26

7:38 pm-3:35 pm

1 stop11h 57m

London Heathrow

Fri 5/15

8:40 am-9:13 pm

2 stops20h 33m

$648

SpokaneLondon

GEG - LHR

GEGLHR

Spokane

Sun 3/8

6:00 am-11:20 am

2 stops22h 20m

London Heathrow

Sun 3/15

1:25 pm-9:59 pm

2 stops39h 34m

$649

SpokaneLondon

GEG - LHR

GEGLHR

Spokane

Wed 4/22

7:10 am-8:35 am

2 stops17h 25m

London Heathrow

Fri 5/8

2:05 pm-6:36 pm

2 stops36h 31m

$657

BoiseLondon

BOI - LHR

BOILHR

Boise Air Term. Gowen Fld

Wed 3/11

7:05 am-4:50 pm

1 stop27h 45m

London Heathrow

Mon 3/16

2:30 pm-10:04 pm

1 stop13h 34m

$660

Flights are sorted by cheapest round-trip 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?

The month of April is, on average, the cheapest month to fly to London Heathrow Airport from Idaho, with most prices found around $755. If you’re not able to fly to London Heathrow Airport in April, then August is your next best option. Flight prices from Idaho to London Heathrow Airport during August average around $797.

Can stopping save me money on Idaho to London Heathrow Airport flights?

You could potentially save up to 4% on your flight if you consider stops on a Idaho to London Heathrow Airport flight.

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 51m

Direct flights

None
The fastest flight from Idaho to London Heathrow Airport takes 11h 51m
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 refresh daily.

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

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

    Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, 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.

Best airlines flying from Idaho to London Heathrow Airport

Compare and see reviews for airlines that fly from Idaho to London Heathrow Airport with momondo
Airline
Rating
Free Cancellation
Price
KLMPriceFrom $577Free CancellationRating
7.7
1,451 reviews
Search KLM flights
Virgin AtlanticPriceFrom $604Free CancellationRating
7.5
678 reviews
Search Virgin Atlantic flights
United AirlinesPriceFrom $639Free CancellationRating
7.4
9,274 reviews
Search United Airlines flights
DeltaPriceFrom $701Free CancellationRating
7.9
8,175 reviews
Search Delta flights

Traveling to a place near London?

Book flights to London if you plan to visit one of these locations
Gatwick
Hounslow
Milton Keynes
Luton
Dover
Slough
Crawley
Hayes
Wembley
Dartford
Stratford-upon-Avon
Croydon
Brentwood
Guildford
Harrow
Watford
Cobham
Folkestone
Romford
Stansted

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?

All flight searches from Idaho to London on momondo can be filtered to show those which offer flexible booking policies.

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

Once you have performed a search for Idaho to London flights, momondo helps you find the right one by offering useful filters to narrow down your flight selection. Flights can be filtered by multiple factors such as airline, airport and price; but also by other criteria like aircraft type and payment method.

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

Of course. momondo tracks the price of Idaho to London flights. All you need is a valid email address and we will do the rest; it is that quick and easy.

An easier way to manage your London Heathrow Airport trip

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