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Cheap flights from Idaho to London from $282

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 9/20. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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0 bags

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Find the cheapest flights from Idaho to London

Cheap round-trip flights

United Airlines Logo
5:39 pm - 12:20 pmBOI-LHR
11h 41m1 stop
United Airlines Logo
6:55 am - 10:30 pmLHR-BOI
22h 35m2 stops
$615United Airlines
Find Deal
Tue, Sep 23 - Wed, Oct 1
Air Canada Logo
9:45 am - 1:20 pmBOI-LHR
20h 35m2 stops
Air Canada Logo
2:30 pm - 11:28 pmLHR-BOI
38h 58m2 stops
$618Air Canada
Find Deal
Sun, Oct 19 - Wed, Oct 29
Delta Logo
9:00 am - 11:20 amBOI-LHR
19h 20m1 stop
Delta Logo
11:30 am - 11:57 pmLHR-BOI
19h 27m2 stops
$621Delta
Find Deal
Tue, Sep 23 - Wed, Oct 1
Delta Logo
1:10 pm - 10:00 amGEG-LHR
12h 50m1 stop
Delta Logo
6:20 am - 4:07 pmLHR-GEG
17h 47m2 stops
$621Delta
Find Deal
Wed, Nov 5 - Wed, Nov 19
Iberia Logo
1:33 pm - 10:50 amBOI-LHR
14h 17m1 stop
Iberia Logo
9:15 am - 10:24 pmLHR-BOI
43h 09m2 stops
$622Iberia
Find Deal
Sun, Oct 19 - Wed, Oct 29
KLM Logo
1:00 pm - 10:30 amGEG-LHR
13h 30m1 stop
KLM Logo
6:30 am - 2:42 pmLHR-GEG
16h 12m2 stops
$623KLM
Find Deal
Wed, Jan 28 - Wed, Feb 18
Iberia Logo
1:33 pm - 6:25 amBOI-LHR
33h 52m1 stop
Iberia Logo
9:15 am - 10:24 pmLHR-BOI
43h 09m2 stops
$628Iberia
Find Deal
Sat, Oct 18 - Wed, Oct 29
KLM Logo
11:20 am - 10:30 amGEG-LHR
15h 10m1 stop
KLM Logo
10:45 am - 4:07 pmLHR-GEG
13h 22m1 stop
$630KLM
Find Deal
Wed, Nov 5 - Wed, Nov 19
Logo
4:46 pm - 2:15 pmBOI-LHR
14h 29m1 stop
Logo
11:05 am - 9:51 pmLHR-BOI
16h 46m2 stops
$644
Find Deal
Sun, Oct 19 - Tue, Oct 28
Logo
7:15 am - 11:50 amGEG-LHR
20h 35m2 stops
Logo
10:15 am - 11:15 pmLHR-GEG
21h 00m2 stops
$656
Find Deal
Wed, Oct 1 - Tue, Oct 7

Delta flights from Idaho to London Heathrow Airport

Our best Delta deals on Idaho to London Heathrow Airport flight tickets
Delta
Sep 23
BOI9:00 amBoise Air Term. Gowen Fld
19h 20m
1 stop
LHR11:20 amLondon Heathrow
Oct 1
LHR11:30 amLondon Heathrow
19h 27m
2 stops
BOI11:57 pmBoise Air Term. Gowen Fld
$621
Find similar
Delta
Aug 24
GEG3:25 pmSpokane
11h 55m
1 stop
LHR11:20 amLondon Heathrow
Sep 5
LHR8:40 amLondon Heathrow
23h 22m
2 stops
GEG12:02 amSpokane
$622
Find similar
Delta
Sep 23
BOI11:32 amBoise Air Term. Gowen Fld
16h 53m
2 stops
LHR11:25 amLondon Heathrow
Oct 1
LHR6:15 amLondon Heathrow
16h 25m
2 stops
BOI3:40 pmBoise Air Term. Gowen Fld
$626
Find similar

Virgin Atlantic flights from Idaho to London Heathrow Airport

Our best Virgin Atlantic deals on Idaho to London Heathrow Airport flight tickets
Virgin Atlantic
Aug 18
GEG2:21 pmSpokane
14h 49m
1 stop
LHR1:10 pmLondon Heathrow
Sep 2
LHR10:55 amLondon Heathrow
19h 35m
2 stops
GEG10:30 pmSpokane
$539
Find similar
Virgin Atlantic
Aug 18
GEG2:21 pmSpokane
14h 49m
1 stop
LHR1:10 pmLondon Heathrow
Sep 2
LHR5:25 pmLondon Heathrow
14h 37m
1 stop
GEG12:02 amSpokane
$540
Find similar
Virgin Atlantic
Sep 26
BOI4:20 pmBoise Air Term. Gowen Fld
12h 00m
1 stop
LHR11:20 amLondon Heathrow
Oct 3
LHR1:25 pmLondon Heathrow
13h 55m
1 stop
BOI8:20 pmBoise Air Term. Gowen Fld
$645
Find similar

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 August 13, 2025.
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

Tue 9/23

5:39 pm-12:20 pm

1 stop11h 41m

London Heathrow

Wed 10/1

6:55 am-10:30 pm

2 stops22h 35m

$615

BoiseLondon

BOI - LHR

BOILHR

Boise Air Term. Gowen Fld

Sun 10/19

9:45 am-1:20 pm

2 stops20h 35m

London Heathrow

Wed 10/29

2:30 pm-11:28 pm

2 stops38h 58m

$618

BoiseLondon

BOI - LHR

BOILHR

Boise Air Term. Gowen Fld

Tue 9/23

9:00 am-11:20 am

1 stop19h 20m

London Heathrow

Wed 10/1

11:30 am-11:57 pm

2 stops19h 27m

$621

SpokaneLondon

GEG - LHR

GEGLHR

Spokane

Wed 11/5

1:10 pm-10:00 am

1 stop12h 50m

London Heathrow

Wed 11/19

6:20 am-4:07 pm

2 stops17h 47m

$621

BoiseLondon

BOI - LHR

BOILHR

Boise Air Term. Gowen Fld

Sun 10/19

1:33 pm-10:50 am

1 stop14h 17m

London Heathrow

Wed 10/29

9:15 am-10:24 pm

2 stops43h 09m

$622

SpokaneLondon

GEG - LHR

GEGLHR

Spokane

Wed 1/28

1:00 pm-10:30 am

1 stop13h 30m

London Heathrow

Wed 2/18

6:30 am-2:42 pm

2 stops16h 12m

$623

BoiseLondon

BOI - LHR

BOILHR

Boise Air Term. Gowen Fld

Sat 10/18

1:33 pm-6:25 am

1 stop33h 52m

London Heathrow

Wed 10/29

9:15 am-10:24 pm

2 stops43h 09m

$628

SpokaneLondon

GEG - LHR

GEGLHR

Spokane

Wed 11/5

11:20 am-10:30 am

1 stop15h 10m

London Heathrow

Wed 11/19

10:45 am-4:07 pm

1 stop13h 22m

$630

BoiseLondon

BOI - LHR

BOILHR

Boise Air Term. Gowen Fld

Sun 10/19

4:46 pm-2:15 pm

1 stop14h 29m

London Heathrow

Tue 10/28

11:05 am-9:51 pm

2 stops16h 46m

$644

SpokaneLondon

GEG - LHR

GEGLHR

Spokane

Wed 10/1

7:15 am-11:50 am

2 stops20h 35m

London Heathrow

Tue 10/7

10:15 am-11:15 pm

2 stops21h 00m

$656

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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2

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 October is, on average, the cheapest month to fly to London Heathrow Airport from Idaho, with most prices found around $698. If you’re not able to fly to London Heathrow Airport in October, then August is your next best option. Flight prices from Idaho to London Heathrow Airport during August average around $807.

What is the cheapest day to depart on your flight to London Heathrow Airport?

Our data shows that Tuesday is the least expensive day to fly to London Heathrow Airport. Tickets to fly out on this day can be as low as $854. The most expensive day to fly to London Heathrow Airport is Friday, with ticket prices averaging around $1,110.

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

According to our data, the cheapest time of day to fly to London Heathrow Airport is in the evening. momondo users have found flights departing from Idaho to London Heathrow Airport in the evening for as low as $891. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. Flights in the morning are often more expensive with an average ticket price of $1,011.

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

You are more likely to see cheaper flights to London Heathrow Airport from Idaho when booking weeks ahead of your departure date. In general, you can expect to find flights to London Heathrow Airport for around $941 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to London Heathrow Airport from Idaho for as low as $684 on momondo.

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

Best Price Found

$282

Fastest flight time

11h 41m

Direct flights

None
The best one-way flight to London Heathrow Airport from Idaho in the past 72 hours is $282. The best round-trip flight deal from Idaho to London Heathrow Airport found on momondo in the last 72 hours is $615.
The fastest flight from Idaho to London Heathrow Airport takes 11h 41m
There are no direct flights from Idaho to London Heathrow Airport. Popular non-direct routes for this connection are Idaho Falls Fanning Field Airport - London Heathrow Airport, Spokane Airport - London Heathrow Airport and Boise Air Term. Gowen Fld Airport - London Heathrow Airport.
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  • 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
7.8
1,381 reviews
Search KLM flights
United AirlinesPriceFrom $679Free CancellationRating
7.4
8,920 reviews
Search United Airlines flights
Virgin AtlanticPriceFrom $695Free CancellationRating
7.4
657 reviews
Search Virgin Atlantic flights
American AirlinesPriceFrom $703Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights
DeltaPriceFrom $751Free CancellationRating
8.0
7,979 reviews
Search Delta flights

Traveling to a place near London?

Book flights to London if you plan to visit one of these locations
Hounslow
Gatwick
Dover
Slough
Luton
Guildford
Milton Keynes
Dartford
Crawley
Hayes
Chelmsford
Stansted
Salisbury
Brentwood
Ilford
Swindon
Colchester
Folkestone
Stratford-upon-Avon
Watford

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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