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

American Airlines, Iberia, and KLM 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 Idaho Falls, and flying into London, then you can expect flight times to average 11h 56m and 12h 09m, 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 32% of people opting to fly with this airline when traveling to London. Keep in mind that there are 4 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 March 2026.

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.

$309 Cheap Flights from Idaho to London in 2026

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Find the cheapest flights from Idaho to London

Round-trip

One-way

Last minute

Cheap round-trip flights

Enter your travel dates to find the best prices.

12:25 pm - 7:40 pm

GEG

LHR

23h 15m

2 stops

9:30 am - 9:16 pm

LHR

GEG

19h 46m

2 stops

$819Lufthansa

Tue, May 5 - Tue, May 19

6:44 am - 12:10 pm

BOI

LHR

22h 26m

1 stop

2:25 pm - 10:17 pm

LHR

BOI

14h 52m

1 stop

$854Finnair

Wed, Aug 5 - Wed, Aug 19

12:45 pm - 10:55 am

GEG

LHR

14h 10m

1 stop

11:00 am - 8:47 pm

LHR

GEG

17h 47m

1 stop

$854American Airlines

Wed, Aug 12 - Tue, Sep 15

12:45 pm - 12:50 pm

GEG

LHR

16h 05m

1 stop

9:50 am - 10:57 pm

LHR

GEG

21h 07m

1 stop

$855Multiple Airlines

Wed, Sep 9 - Wed, Oct 7

12:45 pm - 12:50 pm

GEG

LHR

16h 05m

1 stop

6:15 am - 8:47 pm

LHR

GEG

22h 32m

2 stops

$856Iberia

Wed, Sep 9 - Wed, Oct 7

6:00 am - 9:00 am

GEG

LHR

19h 00m

1 stop

6:15 am - 8:47 pm

LHR

GEG

22h 32m

2 stops

$872Iberia

Wed, Aug 12 - Tue, Sep 15

3:30 pm - 5:35 pm

BOI

LHR

19h 05m

1 stop

6:30 am - 3:38 pm

LHR

BOI

16h 08m

2 stops

$876Delta

Wed, Sep 9 - Wed, Sep 16

8:45 am - 10:20 am

BOI

LHR

18h 35m

2 stops

6:30 am - 3:38 pm

LHR

BOI

16h 08m

2 stops

$881Delta

Wed, Sep 9 - Wed, Sep 16

12:12 pm - 10:55 am

IDA

LHR

15h 43m

1 stop

12:55 pm - 9:22 pm

LHR

IDA

15h 27m

1 stop

$904Multiple Airlines

Thu, Sep 17 - Fri, Sep 25

2:20 pm - 12:50 pm

IDA

LHR

15h 30m

1 stop

9:10 am - 9:22 pm

LHR

IDA

19h 12m

2 stops

$938American Airlines

Thu, Sep 17 - Fri, Sep 25

Finnair flights from Idaho to London

Our best Finnair deals on Idaho to London flight tickets

Finnair

Aug 5

BOI6:44 amBoise Air Term. Gowen Fld

22h 26m

1 stop

LHR12:10 pmLondon Heathrow

Aug 19

LHR2:25 pmLondon Heathrow

14h 52m

1 stop

BOI10:17 pmBoise Air Term. Gowen Fld

$854

Finnair

Aug 17

BOI6:44 amBoise Air Term. Gowen Fld

19h 16m

1 stop

LHR9:00 amLondon Heathrow

Aug 24

LHR2:25 pmLondon Heathrow

14h 52m

1 stop

BOI10:17 pmBoise Air Term. Gowen Fld

$904

Finnair

Sep 9

BOI1:18 pmBoise Air Term. Gowen Fld

14h 32m

1 stop

LHR10:50 amLondon Heathrow

Sep 16

LHR8:55 amLondon Heathrow

20h 22m

1 stop

BOI10:17 pmBoise Air Term. Gowen Fld

$905

American Airlines flights from Idaho to London

Our best American Airlines deals on Idaho to London flight tickets

American Airlines

Aug 12

GEG12:45 pmSpokane

14h 10m

1 stop

LHR10:55 amLondon Heathrow

Sep 15

LHR11:00 amLondon Heathrow

17h 47m

1 stop

GEG8:47 pmSpokane

$854

American Airlines

Sep 9

GEG3:50 pmSpokane

15h 15m

1 stop

LHR3:05 pmLondon Heathrow

Oct 7

LHR8:55 amLondon Heathrow

19h 52m

1 stop

GEG8:47 pmSpokane

$856

American Airlines

Sep 9

GEG12:45 pmSpokane

16h 05m

1 stop

LHR12:50 pmLondon Heathrow

Oct 7

LHR8:55 amLondon Heathrow

19h 52m

1 stop

GEG8:47 pmSpokane

$902

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

SpokaneLondon

GEG - LHR

GEGLHR

Spokane

Tue 5/5

12:25 pm-7:40 pm

2 stops23h 15m

London Heathrow

Tue 5/19

9:30 am-9:16 pm

2 stops19h 46m

$819

BoiseLondon

BOI - LHR

BOILHR

Boise Air Term. Gowen Fld

Wed 8/5

6:44 am-12:10 pm

1 stop22h 26m

London Heathrow

Wed 8/19

2:25 pm-10:17 pm

1 stop14h 52m

$854

SpokaneLondon

GEG - LHR

GEGLHR

Spokane

Wed 8/12

12:45 pm-10:55 am

1 stop14h 10m

London Heathrow

Tue 9/15

11:00 am-8:47 pm

1 stop17h 47m

$854

SpokaneLondon

GEG - LHR

GEGLHR

Spokane

Wed 9/9

12:45 pm-12:50 pm

1 stop16h 05m

London Heathrow

Wed 10/7

9:50 am-10:57 pm

1 stop21h 07m

$855

SpokaneLondon

GEG - LHR

GEGLHR

Spokane

Wed 9/9

12:45 pm-12:50 pm

1 stop16h 05m

London Heathrow

Wed 10/7

6:15 am-8:47 pm

2 stops22h 32m

$856

SpokaneLondon

GEG - LHR

GEGLHR

Spokane

Wed 8/12

6:00 am-9:00 am

1 stop19h 00m

London Heathrow

Tue 9/15

6:15 am-8:47 pm

2 stops22h 32m

$872

BoiseLondon

BOI - LHR

BOILHR

Boise Air Term. Gowen Fld

Wed 9/9

3:30 pm-5:35 pm

1 stop19h 05m

London Heathrow

Wed 9/16

6:30 am-3:38 pm

2 stops16h 08m

$876

BoiseLondon

BOI - LHR

BOILHR

Boise Air Term. Gowen Fld

Wed 9/9

8:45 am-10:20 am

2 stops18h 35m

London Heathrow

Wed 9/16

6:30 am-3:38 pm

2 stops16h 08m

$881

Quickest round-trip

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Thu 9/17

12:12 pm-10:55 am

1 stop15h 43m

London Heathrow

Fri 9/25

12:55 pm-9:22 pm

1 stop15h 27m

$904

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Thu 9/17

2:20 pm-12:50 pm

1 stop15h 30m

London Heathrow

Fri 9/25

9:10 am-9:22 pm

2 stops19h 12m

$938

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

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 $701, are often lower during this time because this is during the off-season. The month of April is another great option to travel to London, with average flight prices from Idaho averaging around $707.

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 05m
Direct flights	None

The fastest flight from Idaho to London takes 12h 05m

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 March 2026.
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 1,477 reviews	Search KLM flights
Virgin Atlantic	PriceFrom $604	Free Cancellation	Rating 7.5 685 reviews	Search Virgin Atlantic flights
United Airlines	PriceFrom $639	Free Cancellation	Rating 7.4 9,500 reviews	Search United Airlines flights
Delta	PriceFrom $678	Free Cancellation	Rating 7.9 8,352 reviews	Search Delta flights

Gatwick

Hounslow

Milton Keynes

Luton

Dover

Crawley

Slough

Wembley

Hayes

Croydon

Dartford

Brentwood

Guildford

Harrow

Cobham

Folkestone

Romford

Stansted

Watford

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.

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Cheap flights from Idaho to London from $309

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 7/26. 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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How to get the cheapest flight ticket from Idaho to London

What is the cheapest month to fly to London?

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

What airlines fly to London?

How long does it take to fly to London?

Cheap Idaho to London flight deals and tips

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Fastest flight time

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Best airlines flying from Idaho to London

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Traveling to a place near London?

Why use momondo?

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

Fly your favorite airline to London

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List of cabin classes available on flights landing in London. Availability may vary depending on flight origin and airline.

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