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

Air Canada, United Airlines, and Icelandair are the most popular carriers operating from London to Idaho

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

Prices for flights from London to Idaho refresh daily.

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

The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from London to Idaho.

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

The required travel and health documents for your Idaho trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Idaho. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

$619 Cheap Flights from London to Idaho in 2026/27

Find the cheapest flights from London to Idaho

Round-trip

One-way

Last minute

Cheap round-trip flights

Enter your travel dates to find the best prices.

6:00 pm - 2:52 pmLHR London Heathrow-BOI Boise Air Term. Gowen Fld

27h 52m2 stops Toronto Pearson Intl San Francisco

4:10 pm - 5:55 amBOI Boise Air Term. Gowen Fld-LHR London Heathrow

30h 45m2 stops San Francisco Chicago O'Hare Intl

$937United Airlines

Tue, Jan 5 - Tue, Jan 12

2:45 pm - 2:19 pmLHR London Heathrow-BOI Boise Air Term. Gowen Fld

30h 34m1 stop Seattle/Tacoma Intl

2:12 pm - 12:20 pmBOI Boise Air Term. Gowen Fld-LHR London Heathrow

15h 08m1 stop Seattle/Tacoma Intl

$964Alaska Airlines

Fri, Dec 11 - Thu, Dec 24

7:40 am - 9:15 pmLHR London Heathrow-BOI Boise Air Term. Gowen Fld

20h 35m2 stops Chicago O'Hare Intl San Francisco

6:10 am - 9:40 amBOI Boise Air Term. Gowen Fld-LHR London Heathrow

20h 30m2 stops San Francisco Denver Intl

$994United Airlines

Fri, Nov 27 - Fri, Dec 4

2:45 pm - 3:28 pmLHR London Heathrow-BOI Boise Air Term. Gowen Fld

31h 43m1 stop Seattle/Tacoma Intl

6:33 am - 12:20 pmBOI Boise Air Term. Gowen Fld-LHR London Heathrow

22h 47m1 stop Seattle/Tacoma Intl

$997Alaska Airlines

Sat, Nov 21 - Sat, Nov 28

2:45 pm - 3:28 pmLHR London Heathrow-BOI Boise Air Term. Gowen Fld

31h 43m1 stop Seattle/Tacoma Intl

6:33 am - 12:20 pmBOI Boise Air Term. Gowen Fld-LHR London Heathrow

22h 47m1 stop Seattle/Tacoma Intl

$999Alaska Airlines

Sat, Nov 21 - Sat, Nov 28

2:45 pm - 3:28 pmLHR London Heathrow-BOI Boise Air Term. Gowen Fld

31h 43m1 stop Seattle/Tacoma Intl

6:33 am - 12:20 pmBOI Boise Air Term. Gowen Fld-LHR London Heathrow

22h 47m1 stop Seattle/Tacoma Intl

$1,000Alaska Airlines

Sat, Nov 21 - Sat, Nov 28

2:45 pm - 3:28 pmLHR London Heathrow-BOI Boise Air Term. Gowen Fld

31h 43m1 stop Seattle/Tacoma Intl

6:33 am - 12:20 pmBOI Boise Air Term. Gowen Fld-LHR London Heathrow

22h 47m1 stop Seattle/Tacoma Intl

$1,001Alaska Airlines

Sat, Nov 21 - Sat, Nov 28

2:45 pm - 3:28 pmLHR London Heathrow-BOI Boise Air Term. Gowen Fld

31h 43m1 stop Seattle/Tacoma Intl

6:33 am - 12:20 pmBOI Boise Air Term. Gowen Fld-LHR London Heathrow

22h 47m1 stop Seattle/Tacoma Intl

$1,003Alaska Airlines

Sat, Nov 21 - Sat, Nov 28

12:15 pm - 11:10 pmLHR London Heathrow-BOI Boise Air Term. Gowen Fld

17h 55m2 stops Reykjavik Keflavik Intl Denver Intl

7:30 am - 10:50 amBOI Boise Air Term. Gowen Fld-LHR London Heathrow

20h 20m2 stops Denver Intl Reykjavik Keflavik Intl

$1,008Multiple Airlines

Fri, Feb 5 - Fri, Feb 12

7:40 am - 11:55 amLHR London Heathrow-BOI Boise Air Term. Gowen Fld

35h 15m1 stop Chicago O'Hare Intl

4:10 pm - 7:40 amBOI Boise Air Term. Gowen Fld-LHR London Heathrow

32h 30m2 stops San Francisco Houston George Bush Intcntl

$1,025United Airlines

Tue, Jan 5 - Tue, Jan 12

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United Airlines flights from London to Idaho

Our best United Airlines deals on London to Idaho flight tickets

United Airlines

Jan 5

LHR6:00 pmLondon Heathrow

27h 52m

2 stops

BOI2:52 pmBoise Air Term. Gowen Fld

Jan 12

BOI4:10 pmBoise Air Term. Gowen Fld

30h 45m

2 stops

LHR5:55 amLondon Heathrow

$937

United Airlines

Nov 27

LHR7:40 amLondon Heathrow

20h 35m

2 stops

BOI9:15 pmBoise Air Term. Gowen Fld

Dec 4

BOI6:10 amBoise Air Term. Gowen Fld

20h 30m

2 stops

LHR9:40 amLondon Heathrow

$994

United Airlines

Jan 5

LHR7:40 amLondon Heathrow

35h 15m

1 stop

BOI11:55 amBoise Air Term. Gowen Fld

Jan 12

BOI4:10 pmBoise Air Term. Gowen Fld

32h 30m

2 stops

LHR7:40 amLondon Heathrow

$1,025

Alaska Airlines flights from London to Idaho

Our best Alaska Airlines deals on London to Idaho flight tickets

Alaska Airlines

Dec 11

LHR2:45 pmLondon Heathrow

30h 34m

1 stop

BOI2:19 pmBoise Air Term. Gowen Fld

Dec 24

BOI2:12 pmBoise Air Term. Gowen Fld

15h 08m

1 stop

LHR12:20 pmLondon Heathrow

$964

Alaska Airlines

Nov 21

LHR2:45 pmLondon Heathrow

31h 43m

1 stop

BOI3:28 pmBoise Air Term. Gowen Fld

Nov 28

BOI6:33 amBoise Air Term. Gowen Fld

22h 47m

1 stop

LHR12:20 pmLondon Heathrow

$997

Alaska Airlines

Nov 21

LHR2:45 pmLondon Heathrow

31h 43m

1 stop

BOI3:28 pmBoise Air Term. Gowen Fld

Nov 28

BOI6:33 amBoise Air Term. Gowen Fld

22h 47m

1 stop

LHR12:20 pmLondon Heathrow

$999

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

LondonBoise

LHR London Heathrow - BOI Boise Air Term. Gowen Fld

LHRBOI

London Heathrow

Tue 1/5

6:00 pm-2:52 pm

2 stops27h 52m

Boise Air Term. Gowen Fld

Tue 1/12

4:10 pm-5:55 am

2 stops30h 45m

$937

LondonBoise

LHR London Heathrow - BOI Boise Air Term. Gowen Fld

LHRBOI

London Heathrow

Fri 12/11

2:45 pm-2:19 pm

1 stop30h 34m

Boise Air Term. Gowen Fld

Thu 12/24

2:12 pm-12:20 pm

1 stop15h 08m

$964

LondonBoise

LHR London Heathrow - BOI Boise Air Term. Gowen Fld

LHRBOI

London Heathrow

Fri 11/27

7:40 am-9:15 pm

2 stops20h 35m

Boise Air Term. Gowen Fld

Fri 12/4

6:10 am-9:40 am

2 stops20h 30m

$994

LondonBoise

LHR London Heathrow - BOI Boise Air Term. Gowen Fld

LHRBOI

London Heathrow

Sat 11/21

2:45 pm-3:28 pm

1 stop31h 43m

Boise Air Term. Gowen Fld

Sat 11/28

6:33 am-12:20 pm

1 stop22h 47m

$997

LondonBoise

LHR London Heathrow - BOI Boise Air Term. Gowen Fld

LHRBOI

London Heathrow

Sat 11/21

2:45 pm-3:28 pm

1 stop31h 43m

Boise Air Term. Gowen Fld

Sat 11/28

6:33 am-12:20 pm

1 stop22h 47m

$999

LondonBoise

LHR London Heathrow - BOI Boise Air Term. Gowen Fld

LHRBOI

London Heathrow

Sat 11/21

2:45 pm-3:28 pm

1 stop31h 43m

Boise Air Term. Gowen Fld

Sat 11/28

6:33 am-12:20 pm

1 stop22h 47m

$1,000

LondonBoise

LHR London Heathrow - BOI Boise Air Term. Gowen Fld

LHRBOI

London Heathrow

Sat 11/21

2:45 pm-3:28 pm

1 stop31h 43m

Boise Air Term. Gowen Fld

Sat 11/28

6:33 am-12:20 pm

1 stop22h 47m

$1,001

LondonBoise

LHR London Heathrow - BOI Boise Air Term. Gowen Fld

LHRBOI

London Heathrow

Sat 11/21

2:45 pm-3:28 pm

1 stop31h 43m

Boise Air Term. Gowen Fld

Sat 11/28

6:33 am-12:20 pm

1 stop22h 47m

$1,003

Quickest round-trip

LondonBoise

LHR London Heathrow - BOI Boise Air Term. Gowen Fld

LHRBOI

London Heathrow

Fri 2/5

12:15 pm-11:10 pm

2 stops17h 55m

Boise Air Term. Gowen Fld

Fri 2/12

7:30 am-10:50 am

2 stops20h 20m

$1,008

LondonBoise

LHR London Heathrow - BOI Boise Air Term. Gowen Fld

LHRBOI

London Heathrow

Tue 1/5

7:40 am-11:55 am

1 stop35h 15m

Boise Air Term. Gowen Fld

Tue 1/12

4:10 pm-7:40 am

2 stops32h 30m

$1,025

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 London to Idaho

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

What is the cheapest month to fly to Idaho?

In general, April is the cheapest month to fly from London to Idaho. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $847. If you don’t want to visit Idaho in April, then you should wait until March to fly from London, when ticket prices are also cheap, with an average price of $874.

Can stopping save me money on London to Idaho flights?

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

Cheap London to Idaho flight deals and tips

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

Best Price Found	$619
Fastest flight time	16h 43m
Direct flights	None

The best one-way flight to Idaho from London in the past 72 hours is $619. The best round-trip flight deal from London to Idaho found on momondo in the last 72 hours is $937.

The fastest flight from London to Idaho takes 16h 43m

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

Search flight deals

Frequently asked questions about flying from London to Idaho

When did momondo last update prices for flights from London to Idaho?
Prices for flights from London to Idaho refresh daily.
How old do you have to be to fly from London to Idaho?
The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from London to Idaho.
What documentation or ID do you need to fly to Idaho?
The required travel and health documents for your Idaho trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Idaho. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

Why use momondo?

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

It is quick and easy to find London to Idaho 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 Idaho that suits you.

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

Flights from London to Idaho with flexible booking policies can be found by using the search form above and then selecting our dedicated flexible booking filter, which will highlight only the flights where this policy is applied.

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

momondo provides multiple filters to help you find the best flight to Idaho from London. Filter by price, airline, airports, cabin, aircraft, payment method, number of stops and more.

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

If you are not ready to book a flight from London to Idaho now, use our insights above to find helpful tips or alternatively set up a price alert, where momondo will track prices on flights to Idaho and let you know when they change.