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

KLM, Delta, and Lufthansa are the most popular carriers operating from Idaho to London

How long does it take to fly to London?

If you’re flying from a popular airport in Idaho, such as Boise or Lewiston, and flying into London, then you can expect flight times to average 12h 03m and 13h 30m, respectively.

What airlines fly to London?

Delta, United Airlines and Virgin Atlantic are the top three most popular airlines that fly to London from Idaho according to our data. Delta is the first choice among our users, with 36% of people opting to fly with this airline when traveling to London. Keep in mind that there are 5 different airlines that fly to London 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?

Prices for flights from Idaho to London refresh daily.

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

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

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

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.

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.

$277 Cheap Flights from Idaho to London in 2025/26

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Find the cheapest flights from Idaho to London

Round-trip

One-way

Last minute

Cheap round-trip flights

3:54 pm - 6:30 pmBOI-LHR

19h 36m2 stops

6:40 am - 10:39 pmLHR-BOI

22h 59m2 stops

$604Scandinavian Airlines

Find Deal

Thu, Nov 13 - Tue, Nov 18

3:54 pm - 9:20 pmBOI-LHR

22h 26m3 stops

6:40 am - 10:39 pmLHR-BOI

22h 59m2 stops

$608Scandinavian Airlines

Find Deal

Thu, Nov 13 - Tue, Nov 18

1:52 pm - 10:55 amGEG-LGW

37h 03m1 stop

10:55 am - 1:12 pmLGW-GEG

34h 17m1 stop

$675Multiple Airlines

Find Deal

Tue, Oct 21 - Fri, Oct 24

12:51 pm - 11:10 amGEG-LHR

14h 19m1 stop

6:30 am - 2:57 pmLHR-GEG

16h 27m2 stops

$715KLM

Find Deal

Sun, Oct 19 - Tue, Nov 4

6:53 pm - 9:50 amIDA-LHR

31h 57m1 stop

8:25 pm - 6:13 pmLHR-IDA

28h 48m2 stops

$721KLM

Find Deal

Sun, Oct 19 - Tue, Nov 4

9:00 am - 12:50 pmBOI-LHR

20h 50m1 stop

6:30 am - 8:20 pmLHR-BOI

20h 50m2 stops

$722Delta

Find Deal

Mon, Nov 17 - Fri, Dec 12

11:20 am - 12:50 pmGEG-LHR

18h 30m1 stop

6:30 am - 7:46 pmLHR-GEG

21h 16m2 stops

$722Delta

Find Deal

Tue, Oct 28 - Thu, Nov 6

1:43 pm - 11:40 amBOI-LHR

14h 57m1 stop

12:20 pm - 6:25 pmLHR-BOI

13h 05m1 stop

$725Virgin Atlantic

Find Deal

Tue, Feb 17 - Thu, Feb 26

8:26 pm - 10:55 amBOI-LGW

31h 29m1 stop

2:00 pm - 3:12 pmLGW-BOI

31h 12m2 stops

$733Multiple Airlines

Find Deal

Thu, Oct 23 - Thu, Oct 30

3:37 pm - 2:15 pmGEG-LHR

14h 38m1 stop

11:05 am - 7:46 pmLHR-GEG

16h 41m1 stop

$735Virgin Atlantic

Find Deal

Sun, Oct 19 - Tue, Nov 4

United Airlines flights from Idaho to London

Our best United Airlines deals on Idaho to London flight tickets

United Airlines

Feb 24

GEG5:00 amSpokane

18h 10m

2 stops

LHR7:10 amLondon Heathrow

Mar 10

LHR1:25 pmLondon Heathrow

28h 30m

2 stops

GEG10:55 amSpokane

$728

Find similar

United Airlines

Nov 5

GEG12:45 pmSpokane

16h 45m

2 stops

LHR1:30 pmLondon Heathrow

Nov 19

LHR1:25 pmLondon Heathrow

30h 06m

2 stops

GEG11:31 amSpokane

$732

Find similar

United Airlines

Feb 24

GEG7:00 amSpokane

16h 25m

1 stop

LHR7:25 amLondon Heathrow

Mar 10

LHR6:00 pmLondon Heathrow

34h 09m

2 stops

GEG9:09 pmSpokane

$734

Find similar

KLM flights from Idaho to London

Our best KLM deals on Idaho to London flight tickets

KLM

Oct 19

GEG12:51 pmSpokane

14h 19m

1 stop

LHR11:10 amLondon Heathrow

Nov 4

LHR6:30 amLondon Heathrow

16h 27m

2 stops

GEG2:57 pmSpokane

$715

Find similar

KLM

Oct 19

IDA6:53 pmIdaho Falls Fanning Field

31h 57m

1 stop

LHR9:50 amLondon Heathrow

Nov 4

LHR8:25 pmLondon Heathrow

28h 48m

2 stops

IDA6:13 pmIdaho Falls Fanning Field

$721

Find similar

KLM

Jan 5

LWS7:05 amLewiston Nez Perce Rgnl

19h 25m

1 stop

LHR10:30 amLondon Heathrow

Mar 10

LHR8:25 pmLondon Heathrow

31h 37m

2 stops

LWS9:02 pmLewiston Nez Perce Rgnl

$730

Find similar

Fly from

Fly to

Route

Depart

Return

Price

BoiseLondon

BOI - LHR

BOILHR

Boise Air Term. Gowen Fld

Thu 11/13

3:54 pm-6:30 pm

2 stops19h 36m

London Heathrow

Tue 11/18

6:40 am-10:39 pm

2 stops22h 59m

$604

BoiseLondon

BOI - LHR

BOILHR

Boise Air Term. Gowen Fld

Thu 11/13

3:54 pm-9:20 pm

3 stops22h 26m

London Heathrow

Tue 11/18

6:40 am-10:39 pm

2 stops22h 59m

$608

SpokaneLondon

GEG - LGW

GEGLGW

Spokane

Tue 10/21

1:52 pm-10:55 am

1 stop37h 03m

London Gatwick

Fri 10/24

10:55 am-1:12 pm

1 stop34h 17m

$675

SpokaneLondon

GEG - LHR

GEGLHR

Spokane

Sun 10/19

12:51 pm-11:10 am

1 stop14h 19m

London Heathrow

Tue 11/4

6:30 am-2:57 pm

2 stops16h 27m

$715

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Sun 10/19

6:53 pm-9:50 am

1 stop31h 57m

London Heathrow

Tue 11/4

8:25 pm-6:13 pm

2 stops28h 48m

$721

BoiseLondon

BOI - LHR

BOILHR

Boise Air Term. Gowen Fld

Mon 11/17

9:00 am-12:50 pm

1 stop20h 50m

London Heathrow

Fri 12/12

6:30 am-8:20 pm

2 stops20h 50m

$722

SpokaneLondon

GEG - LHR

GEGLHR

Spokane

Tue 10/28

11:20 am-12:50 pm

1 stop18h 30m

London Heathrow

Thu 11/6

6:30 am-7:46 pm

2 stops21h 16m

$722

BoiseLondon

BOI - LHR

BOILHR

Boise Air Term. Gowen Fld

Tue 2/17

1:43 pm-11:40 am

1 stop14h 57m

London Heathrow

Thu 2/26

12:20 pm-6:25 pm

1 stop13h 05m

$725

BoiseLondon

BOI - LGW

BOILGW

Boise Air Term. Gowen Fld

Thu 10/23

8:26 pm-10:55 am

1 stop31h 29m

London Gatwick

Thu 10/30

2:00 pm-3:12 pm

2 stops31h 12m

$733

SpokaneLondon

GEG - LHR

GEGLHR

Spokane

Sun 10/19

3:37 pm-2:15 pm

1 stop14h 38m

London Heathrow

Tue 11/4

11:05 am-7:46 pm

1 stop16h 41m

$735

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Showing 1-10 of 20 resultsSorted by cheapest first

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

Prices

Airlines

Other information

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 $707, are often lower during this time because this is during the off-season. The month of February is another great option to travel to London, with average flight prices from Idaho averaging around $788.

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

The cheapest day to depart from Idaho to London is on a Wednesday. Travelers who choose to depart for London on a Wednesday will often find tickets for as low as $801. If your travel schedule is flexible, try to avoid departing on a Friday because tickets tend to average around $975. These prices are subject to change though, so be sure to set up a Price Alert for flights to London.

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

Flying to London from Idaho in the morning is the least expensive time of day to depart. momondo users have found prices as low as $864 when looking at flights departing in the morning. Flights to London are more costly in the evening, with an average ticket price of $1,103. Departure times in the evening fall within the peak daily travel times, which is why tickets can be more expensive.

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

You are more likely to see cheaper flights to London from Idaho when booking weeks ahead of your departure date. In general, you can expect to find flights to London for around $971 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to London from Idaho for as low as $687 on momondo.

Can stopping save me money on Idaho to London flights?

You could potentially save up to 3% on your flight if you consider stops on a Idaho to London flight.

Cheap Idaho to London flight deals and tips

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

Direct flights	None

There are no direct flights from Idaho to London. There are no popular flight routes from Idaho to London.

Search flight deals

When did momondo last update prices for flights from Idaho to London?
Prices for flights from Idaho to London refresh daily.
How many operators does momondo search for flights from Idaho to London?
The number of operators available for flights from Idaho to London is 5 as of September 2025.
How old do you have to be to fly from Idaho to London?
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.
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.

Best airlines flying from Idaho to London

Compare and see reviews for airlines that fly from Idaho to London with momondo

Airline	Rating	Free Cancellation	Price
KLM	PriceFrom $577	Free Cancellation	Rating 7.8 1,391 reviews	Search KLM flights
Delta	PriceFrom $691	Free Cancellation	Rating 7.9 7,973 reviews	Search Delta flights
United Airlines	PriceFrom $697	Free Cancellation	Rating 7.4 8,928 reviews	Search United Airlines flights
Virgin Atlantic	PriceFrom $697	Free Cancellation	Rating 7.4 664 reviews	Search Virgin Atlantic flights
American Airlines	PriceFrom $703	Free Cancellation	Rating 7.2 10,000 reviews	Search American Airlines flights

Hounslow

Gatwick

Luton

Dover

Milton Keynes

Slough

Guildford

Hayes

Dartford

Stansted

Crawley

Chelmsford

Brentwood

Ilford

Folkestone

Colchester

Romford

Watford

Wembley

Richmond

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?

Yes. All flights to London from Idaho on momondo can be compared and filtered by various policies on offer, including flexible booking.

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?

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, 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 the United Kingdom

Cheap flights from Idaho to London from $277

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 10/22. 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

Filter for what you want

Filter for what you want

Trusted and free

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Price Alerts

Find the cheapest flights from Idaho to London

Cheap round-trip flights

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Cheap last minute flights

United Airlines flights from Idaho to London

Our best United Airlines deals on Idaho to London flight tickets

KLM flights from Idaho to London

Our best KLM deals on Idaho to London flight tickets

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

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?

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

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

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

Can stopping save me money on Idaho to London flights?

You could potentially save up to 3% on your flight if you consider stops on a Idaho to London flight.

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

KLM, Delta, and Lufthansa are the most popular carriers operating from Idaho to London

What airlines fly to London?

How long does it take to fly to London?

If you’re flying from a popular airport in Idaho, such as Boise or Lewiston, and flying into London, then you can expect flight times to average 12h 03m and 13h 30m, respectively.

Cheap Idaho to London flight deals and tips

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

Direct flights

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

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

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

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

Best airlines flying from Idaho to London

Compare and see reviews for airlines that fly from Idaho to London 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 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 the United Kingdom

Fly into one of these airports located in London

Airports listed have a maximum distance of 35.6 mi from London