How long does it take to fly to London Heathrow Airport?

On average, it takes 11h 58m to fly from Idaho to London Heathrow Airport if you fly out of Boise (the most popular airport in Idaho) and into London Heathrow Airport (the most popular airport in London Heathrow Airport). If you’re flying out of Idaho Falls and into London Heathrow Airport, then the flight time is around 12h.

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

United Airlines, American Airlines, and Lufthansa are the most popular carriers operating from Idaho to London Heathrow

What airlines fly to London Heathrow Airport?

United Airlines, Delta and Virgin Atlantic are the top three most popular airlines that fly to London Heathrow Airport from Idaho according to our data. United Airlines is the first choice among our users, with 37% of people opting to fly with this airline when traveling to London Heathrow Airport. Keep in mind that there are 5 different airlines that fly to London Heathrow Airport on a routine basis, so you have a few additional options to choose from.

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?

The number of operators available for flights from Idaho to London Heathrow Airport is 5 as of December 2025.

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.

$329 Cheap Flights from Idaho to London Heathrow Airport in 2025/26

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One-way

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Cheap round-trip flights

Enter your travel dates to find the best prices.

2:40 pm - 5:55 am

JAC

LHR

32h 15m2 stops

11:35 am - 8:42 pm

LHR

JAC

16h 07m1 stop

$586Lufthansa

Wed, Jan 7 - Wed, Jan 14

2:37 pm - 9:40 am

BOI

LHR

12h 03m1 stop

6:00 pm - 10:57 pm

LHR

BOI

35h 57m2 stops

$590United Airlines

Tue, Jan 13 - Tue, Jan 27

2:37 pm - 7:10 am

BOI

LHR

33h 33m2 stops

1:25 pm - 10:57 pm

LHR

BOI

40h 32m2 stops

$596Air Canada

Tue, Jan 13 - Tue, Jan 27

12:38 pm - 12:00 pm

GEG

LHR

15h 22m1 stop

7:40 am - 9:18 pm

LHR

GEG

20h 38m2 stops

$596Lufthansa

Wed, Mar 4 - Mon, Mar 9

12:51 pm - 10:00 am

BOI

LHR

14h 09m1 stop

2:30 pm - 8:10 pm

LHR

BOI

12h 40m1 stop

$618Virgin Atlantic

Tue, Feb 17 - Thu, Feb 26

1:20 pm - 10:30 am

GEG

LHR

13h 10m1 stop

3:05 pm - 10:52 pm

LHR

GEG

15h 47m1 stop

$618Virgin Atlantic

Sat, Jan 24 - Sat, Jan 31

10:39 am - 10:30 am

BOI

LHR

16h 51m1 stop

6:30 am - 4:17 pm

LHR

BOI

16h 47m2 stops

$620Multiple Airlines

Sat, Jan 24 - Sat, Jan 31

9:05 am - 10:50 am

GEG

LHR

17h 45m2 stops

12:15 pm - 9:25 pm

LHR

GEG

17h 10m2 stops

$620Multiple Airlines

Sat, Jan 24 - Sat, Jan 31

6:30 am - 7:05 am

GEG

LHR

16h 35m1 stop

6:20 am - 3:00 pm

LHR

GEG

16h 40m2 stops

$626Air France

Sat, Jan 24 - Sat, Jan 31

6:25 am - 2:15 pm

LWS

LHR

23h 50m1 stop

11:20 am - 9:05 pm

LHR

LWS

17h 45m1 stop

$1,271Air France

Thu, May 21 - Tue, Jun 2

United Airlines flights from Idaho to London Heathrow Airport

Our best United Airlines deals on Idaho to London Heathrow Airport flight tickets

United Airlines

Jan 13

BOI2:37 pmBoise Air Term. Gowen Fld

12h 03m

1 stop

LHR9:40 amLondon Heathrow

Jan 27

LHR6:00 pmLondon Heathrow

35h 57m

2 stops

BOI10:57 pmBoise Air Term. Gowen Fld

$590

Find similar

United Airlines

Jan 8

IDA10:51 amIdaho Falls Fanning Field

16h 34m

2 stops

LHR10:25 amLondon Heathrow

Jan 21

LHR6:35 amLondon Heathrow

34h 21m

2 stops

IDA9:56 amIdaho Falls Fanning Field

$619

Find similar

United Airlines

Feb 17

BOI2:40 pmBoise Air Term. Gowen Fld

12h 00m

1 stop

LHR9:40 amLondon Heathrow

Feb 27

LHR11:10 amLondon Heathrow

19h 38m

2 stops

BOI11:48 pmBoise Air Term. Gowen Fld

$628

Find similar

Air Canada flights from Idaho to London Heathrow Airport

Our best Air Canada deals on Idaho to London Heathrow Airport flight tickets

Air Canada

Jan 13

BOI2:37 pmBoise Air Term. Gowen Fld

33h 33m

2 stops

LHR7:10 amLondon Heathrow

Jan 27

LHR1:25 pmLondon Heathrow

40h 32m

2 stops

BOI10:57 pmBoise Air Term. Gowen Fld

$596

Find similar

Air Canada

Jan 20

BOI7:45 amBoise Air Term. Gowen Fld

21h 05m

2 stops

LHR11:50 amLondon Heathrow

Jan 28

LHR2:30 pmLondon Heathrow

40h 18m

2 stops

BOI11:48 pmBoise Air Term. Gowen Fld

$633

Find similar

Air Canada

Jan 19

BOI5:16 pmBoise Air Term. Gowen Fld

35h 34m

2 stops

LHR11:50 amLondon Heathrow

Jan 30

LHR2:30 pmLondon Heathrow

36h 15m

2 stops

BOI7:45 pmBoise Air Term. Gowen Fld

$638

Find similar

momondo Fare Finder

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

JacksonLondon

JAC - LHR

JACLHR

Jackson Hole

Wed 1/7

2:40 pm-5:55 am

2 stops32h 15m

London Heathrow

Wed 1/14

11:35 am-8:42 pm

1 stop16h 07m

$586

BoiseLondon

BOI - LHR

BOILHR

Boise Air Term. Gowen Fld

Tue 1/13

2:37 pm-9:40 am

1 stop12h 03m

London Heathrow

Tue 1/27

6:00 pm-10:57 pm

2 stops35h 57m

$590

BoiseLondon

BOI - LHR

BOILHR

Boise Air Term. Gowen Fld

Tue 1/13

2:37 pm-7:10 am

2 stops33h 33m

London Heathrow

Tue 1/27

1:25 pm-10:57 pm

2 stops40h 32m

$596

SpokaneLondon

GEG - LHR

GEGLHR

Spokane

Wed 3/4

12:38 pm-12:00 pm

1 stop15h 22m

London Heathrow

Mon 3/9

7:40 am-9:18 pm

2 stops20h 38m

$596

BoiseLondon

BOI - LHR

BOILHR

Boise Air Term. Gowen Fld

Tue 2/17

12:51 pm-10:00 am

1 stop14h 09m

London Heathrow

Thu 2/26

2:30 pm-8:10 pm

1 stop12h 40m

$618

SpokaneLondon

GEG - LHR

GEGLHR

Spokane

Sat 1/24

1:20 pm-10:30 am

1 stop13h 10m

London Heathrow

Sat 1/31

3:05 pm-10:52 pm

1 stop15h 47m

$618

BoiseLondon

BOI - LHR

BOILHR

Boise Air Term. Gowen Fld

Sat 1/24

10:39 am-10:30 am

1 stop16h 51m

London Heathrow

Sat 1/31

6:30 am-4:17 pm

2 stops16h 47m

$620

SpokaneLondon

GEG - LHR

GEGLHR

Spokane

Sat 1/24

9:05 am-10:50 am

2 stops17h 45m

London Heathrow

Sat 1/31

12:15 pm-9:25 pm

2 stops17h 10m

$620

SpokaneLondon

GEG - LHR

GEGLHR

Spokane

Sat 1/24

6:30 am-7:05 am

1 stop16h 35m

London Heathrow

Sat 1/31

6:20 am-3:00 pm

2 stops16h 40m

$626

LewistonLondon

LWS - LHR

LWSLHR

Lewiston Nez Perce Rgnl

Thu 5/21

6:25 am-2:15 pm

1 stop23h 50m

London Heathrow

Tue 6/2

11:20 am-9:05 pm

1 stop17h 45m

$1,271

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first

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

Prices

Airlines

Other information

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

The month of February is, on average, the cheapest month to fly to London Heathrow Airport from Idaho, with most prices found around $781. If you’re not able to fly to London Heathrow Airport in February, then April is your next best option. Flight prices from Idaho to London Heathrow Airport during April average around $795.

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.

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

You could potentially save up to 21% 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 58m
Direct flights	None

The fastest flight from Idaho to London Heathrow Airport takes 11h 58m

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?
The number of operators available for flights from Idaho to London Heathrow Airport is 5 as of December 2025.
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
KLM	PriceFrom $577	Free Cancellation	Rating 7.7 1,432 reviews	Search KLM flights
Virgin Atlantic	PriceFrom $604	Free Cancellation	Rating 7.5 675 reviews	Search Virgin Atlantic flights
United Airlines	PriceFrom $639	Free Cancellation	Rating 7.4 9,095 reviews	Search United Airlines flights
Delta	PriceFrom $701	Free Cancellation	Rating 7.9 8,007 reviews	Search Delta flights
American Airlines	PriceFrom $703	Free Cancellation	Rating 7.2 11,050 reviews	Search American Airlines flights

Gatwick

Hounslow

Milton Keynes

Dover

Luton

Slough

Guildford

Hayes

Dartford

Stratford-upon-Avon

Crawley

Brentwood

Salisbury

Wembley

Romford

Watford

Ilford

Cobham

Folkestone

Uxbridge

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

We make it super easy to schedule, organize 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 London

Popular cities in the United Kingdom

Flights to London Gatwick Airportfrom $314

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Flights to London Stansted Airportfrom $364

Flights to London Luton Airportfrom $373

Flights to London Southend Airportfrom $473

Flights to Glasgow Intl Airportfrom $388

Flights to Belfast Intl Airportfrom $487

Flights to Belfast City Airportfrom $525

Idaho flight routes

Flights from Idaho Falls Fanning Field to Portland

Flights from Idaho Falls Fanning Field to Las Vegas Harry Reid Intl

Flights from Boise Air Term. Gowen Fld to Seattle/Tacoma Intl

Flights from Boise Air Term. Gowen Fld to Bozeman Gallatin Field

Flights from Boise Air Term. Gowen Fld to Spokane

Flights from Boise Air Term. Gowen Fld to Ontario

Cheap flights from Idaho to London from $329

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 3/1. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.

Big names and deals

Big names and deals

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Filter for what you want

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United Airlines flights from Idaho to London Heathrow Airport

Our best United Airlines deals on Idaho to London Heathrow Airport flight tickets

Air Canada flights from Idaho to London Heathrow Airport

Our best Air Canada deals on Idaho to London Heathrow Airport flight tickets

momondo Fare Finder

Use the filters below to find and compare flights from Idaho to London Heathrow Airport that are best for you.

See travel insights to London from

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

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

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?

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

You could potentially save up to 21% on your flight if you consider stops on a Idaho to London Heathrow Airport flight.

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

United Airlines, American Airlines, and Lufthansa are the most popular carriers operating from Idaho to London Heathrow

What airlines fly to London Heathrow Airport?

How long does it take to fly to London Heathrow Airport?

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

Direct flights

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

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?

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

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

Traveling to a place near London?

Why use momondo?

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

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

How can momondo help me find flights 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?

An easier way to manage your London Heathrow Airport trip

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

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.

Find better results for your trip to London

Popular cities in the United Kingdom

Popular flights according to clicks in the last 7 days on momondo