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Cheap flights from London Heathrow Airport to Idaho from £421

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 5/9. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — BOI
15 Aug — 22 Aug1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Heathrow to Idaho

Enter your travel dates to find the best prices.

Cheapest flights from Heathrow to Idaho
Explore the most affordable flight options available from Heathrow to Idaho. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 16 July 2026.

Fri 18/919:30
LHR
-
BOI
2 stops34h 04m
Scandinavian Airlines
Fri 25/916:00
BOI
-
LHR
2 stops41h 00m
Scandinavian Airlines
Deal found 12/7£570
Tue 8/906:40
LHR
-
GEG
2 stops20h 10m
Scandinavian Airlines
Tue 6/1011:18
GEG
-
LHR
2 stops26h 22m
Scandinavian Airlines
Deal found 14/7£577
Thu 3/918:40
LHR
-
GEG
2 stops30h 20m
Scandinavian Airlines
Tue 15/913:00
GEG
-
LHR
2 stops20h 40m
Scandinavian Airlines
Deal found 15/7£589
Thu 10/917:00
LHR
-
BOI
2 stops36h 34m
Scandinavian Airlines
Mon 14/916:00
BOI
-
LHR
2 stops41h 00m
Scandinavian Airlines
Deal found 12/7£589
Thu 3/917:00
LHR
-
GEG
2 stops32h 00m
Scandinavian Airlines
Fri 18/911:10
GEG
-
LHR
2 stops18h 25m
Scandinavian Airlines
Deal found 16/7£592
Sat 3/1006:40
LHR
-
BOI
2 stops19h 00m
Scandinavian Airlines
Sat 10/1012:08
BOI
-
LHR
3 stops21h 52m
Scandinavian Airlines
Deal found 15/7£613
Tue 15/906:40
LHR
-
GEG
2 stops18h 29m
Scandinavian Airlines
Sat 19/911:10
GEG
-
LHR
2 stops22h 30m
Scandinavian Airlines
Deal found 15/7£621
Tue 8/916:25
LHR
-
GEG
1 stop27h 30m
Finnair
Tue 6/1006:00
GEG
-
LHR
2 stops20h 15m
Finnair
Deal found 15/7£666
Thu 3/913:05
LHR
-
GEG
2 stops17h 20m
Multiple Airlines
Wed 16/908:31
GEG
-
LHR
2 stops27h 49m
Multiple Airlines
Deal found 15/7£681
Wed 16/914:10
LHR
-
BOI
2 stops27h 56m
United Airlines
Wed 23/910:31
BOI
-
LHR
1 stop19h 04m
United Airlines
Deal found 16/7£693
Sun 18/1021:25
LHR
-
BOI
2 stops43h 32m
Multiple Airlines
Sun 1/1116:21
BOI
-
LHR
1 stop12h 59m
Multiple Airlines
Deal found 16/7£697
Wed 16/906:55
LHR
-
BOI
2 stops21h 42m
Lufthansa
Wed 23/912:28
BOI
-
LHR
1 stop16h 27m
Lufthansa
Deal found 13/7£698

Find flight deals from Heathrow to Idaho

Keep the following information in mind while searching for Heathrow to Idaho flight deals. Data was last updated 16 July 2026.

Round-trip from

£565

One-way from

£421

Popular in

December

Cheapest in

January

Average price

£916
Scandinavian Airlines
  • Scandinavian Airlines
  • 1/9-22/9
  • 4 total stops
  • 43h 54m total
  • London to Idaho
Search Deals
5/9
  • 5/9
  • 3 total stops
  • 32h 17m total
  • London to Idaho
Search Deals
Highest demand for flights based on searches. 3% potential increase in price (£21 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease (£25 potential savings vs. average return price).
Search Deals
Average for round-trip flights in July 2026
Search Deals

Cheapflights Fare Finder

 
Customise your flight search to find flights from Heathrow to Idaho 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, Cheapflights users made 858,174 searches. Data last updated 16 July 2026.
Use the filters below to find and compare flights from London Heathrow Airport to Idaho that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

LondonSpokane

LHR - GEG

LHRGEG

London Heathrow

Tue 8/9

06:40-18:50

2 stops20h 10m

Spokane

Tue 6/10

11:18-21:40

2 stops26h 22m

£577

LondonBoise

LHR - BOI

LHRBOI

London Heathrow

Thu 10/9

17:00-22:34

2 stops36h 34m

Boise Air Term. Gowen Fld

Mon 14/9

16:00-16:00

2 stops41h 00m

£589

LondonSpokane

LHR - GEG

LHRGEG

London Heathrow

Sat 5/9

17:00-19:32

2 stops34h 32m

Spokane

Fri 18/9

11:10-13:35

2 stops18h 25m

£592

LondonSpokane

LHR - GEG

LHRGEG

London Heathrow

Tue 15/9

06:40-17:09

2 stops18h 29m

Spokane

Sat 19/9

11:10-17:40

2 stops22h 30m

£621

LondonBoise

LHR - BOI

LHRBOI

London Heathrow

Sat 3/10

06:40-18:40

2 stops19h 00m

Boise Air Term. Gowen Fld

Sat 10/10

10:34-21:40

2 stops28h 06m

£679

LondonSpokane

LHR - GEG

LHRGEG

London Heathrow

Tue 8/9

16:25-11:55

1 stop27h 30m

Spokane

Tue 6/10

06:00-10:15

2 stops20h 15m

£682

LondonSpokane

LHR - GEG

LHRGEG

London Heathrow

Wed 18/11

13:35-21:01

2 stops39h 26m

Spokane

Wed 25/11

12:50-11:15

1 stop14h 25m

£682

LondonBoise

LHR - BOI

LHRBOI

London Heathrow

Wed 16/9

14:10-11:06

2 stops27h 56m

Boise Air Term. Gowen Fld

Wed 23/9

10:31-12:35

1 stop19h 04m

£693

LondonBoise

LHR - BOI

LHRBOI

London Heathrow

Thu 10/9

07:25-19:19

2 stops18h 54m

Boise Air Term. Gowen Fld

Mon 14/9

10:31-09:40

1 stop16h 09m

£749

LondonIdaho Falls

LHR - IDA

LHRIDA

London Heathrow

Tue 1/9

10:05-21:20

1 stop18h 15m

Idaho Falls Fanning Field

Fri 25/9

07:00-10:15

2 stops20h 15m

£769

Flights are sorted by cheapest return flights first.

Deals found on 13/7

Showing 1-10 of 48 resultsSorted by cheapest first
1
2
3
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5

Best time to book a flight from Heathrow to Idaho

Have a flexible travel schedule? Discover the best time to fly to Idaho from Heathrow with our price prediction graph.
Estimated return price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from London Heathrow Airport to Idaho

What is the cheapest month to book a flight from London Heathrow Airport to Idaho?

Currently, March is the cheapest month in which you can book a flight from London Heathrow Airport to Idaho (average of £507). Flying from London Heathrow Airport to Idaho in January is currently the most expensive (average of £784). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

How much does it cost for a return flight from London Heathrow Airport to Idaho?

Reviews of airlines servicing Idaho

Get insights into the airlines that provide service to Idaho. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Idaho. Reviews last updated 16 July 2026.
See what other customers who have flown with Alaska Airlines,Virgin Atlantic, andUnited Airlines from London Heathrow Airport to Idaho have to say. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
7.9
Good
12,665 reviews
Check prices

Food

7.0

Boarding

8.1

Crew

8.5

Entertainment

7.0

Overall

7.9

Comfort

7.8

Reviews

1 / 20
10.0
Excellent

Anonymous,Jun 2026

LHR - SEA

It's my first time flying with Alaska Airlines. All in all it was very good. Excellent crew and the meal was really good .. best mashed potato!! Black point: not waking me up for breakfast. Having departed late from London and arriving in Seattle late at night, it would have been nice to have found a meal on the table when i woke up. Although the crew was very lovely, kind and helpful, I did find it a little regimented in their approach. Also the constant interruptions announcing what we were eating next and unnecessary announcements.
Alaska Airlines
7.9
Good
12,665 reviews
Alaska Airlines
7.9
Good
12,665 reviews
Check prices

Food

7.0

Boarding

8.1

Crew

8.5

Entertainment

7.0

Overall

7.9

Comfort

7.8

Reviews

1 / 20
10.0
Excellent

Anonymous,Jun 2026

LHR - SEA

It's my first time flying with Alaska Airlines. All in all it was very good. Excellent crew and the meal was really good .. best mashed potato!! Black point: not waking me up for breakfast. Having departed late from London and arriving in Seattle late at night, it would have been nice to have found a meal on the table when i woke up. Although the crew was very lovely, kind and helpful, I did find it a little regimented in their approach. Also the constant interruptions announcing what we were eating next and unnecessary announcements.
Virgin Atlantic
7.5
Good
693 reviews
Alaska Airlines
7.9
Good
12,665 reviews
Check prices

Food

7.0

Boarding

8.1

Crew

8.5

Entertainment

7.0

Overall

7.9

Comfort

7.8

Reviews

1 / 20
10.0
Excellent

Anonymous,Jun 2026

LHR - SEA

It's my first time flying with Alaska Airlines. All in all it was very good. Excellent crew and the meal was really good .. best mashed potato!! Black point: not waking me up for breakfast. Having departed late from London and arriving in Seattle late at night, it would have been nice to have found a meal on the table when i woke up. Although the crew was very lovely, kind and helpful, I did find it a little regimented in their approach. Also the constant interruptions announcing what we were eating next and unnecessary announcements.
United Airlines
7.4
Good
9,996 reviews
Alaska Airlines
7.9
Good
12,665 reviews
Check prices

Food

7.0

Boarding

8.1

Crew

8.5

Entertainment

7.0

Overall

7.9

Comfort

7.8

Reviews

1 / 20
10.0
Excellent

Anonymous,Jun 2026

LHR - SEA

It's my first time flying with Alaska Airlines. All in all it was very good. Excellent crew and the meal was really good .. best mashed potato!! Black point: not waking me up for breakfast. Having departed late from London and arriving in Seattle late at night, it would have been nice to have found a meal on the table when i woke up. Although the crew was very lovely, kind and helpful, I did find it a little regimented in their approach. Also the constant interruptions announcing what we were eating next and unnecessary announcements.
Lufthansa
6.8
Okay
8,139 reviews
Alaska Airlines
7.9
Good
12,665 reviews
Check prices

Food

7.0

Boarding

8.1

Crew

8.5

Entertainment

7.0

Overall

7.9

Comfort

7.8

Reviews

1 / 20
10.0
Excellent

Anonymous,Jun 2026

LHR - SEA

It's my first time flying with Alaska Airlines. All in all it was very good. Excellent crew and the meal was really good .. best mashed potato!! Black point: not waking me up for breakfast. Having departed late from London and arriving in Seattle late at night, it would have been nice to have found a meal on the table when i woke up. Although the crew was very lovely, kind and helpful, I did find it a little regimented in their approach. Also the constant interruptions announcing what we were eating next and unnecessary announcements.

Related info for your journey

Find useful and relevant information for your journey from Heathrow to Idaho. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • How long is the flight from London Heathrow Airport to Idaho?

    For as low as £769, Scandinavian Airlines can have you in Idaho from London Heathrow Airport in 18h 15m. Airlines will cover a distance of 4705 mi. Both multi-stop and direct flights can be found to your destination and back.

  • What are the most popular routes from London Heathrow Airport to Idaho?

    While some choose either London Heathrow - Boise Air Term. Gowen Fld or London Heathrow - Spokane, London Heathrow - Jackson Hole is the most popular route from London Heathrow Airport to Idaho.

  • Can I find deals for flights from Heathrow to Idaho that include hotel bookings?

    Yes. In addition to deals on Heathrow to Idaho flights, Cheapflights offers holiday packages that include both flights and hotel.

  • How can I find direct flights from Heathrow to Idaho?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Heathrow to Idaho.

  • Can I find deals for business class flights from Heathrow to Idaho?

    Yes. Cheapflights offers flight deals from Heathrow to Idaho by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from London Heathrow Airport to Idaho?

    Currently, March is the cheapest month in which you can book a flight from London Heathrow Airport to Idaho (average of £507). Flying from London Heathrow Airport to Idaho in January is currently the most expensive (average of £784). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

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Alternative routes for Heathrow to Idaho

See prices for flight routes from nearby airports that may be better suited for you.
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Top 4 airlines flying from Heathrow to Idaho

Discover the top 4 airlines that operate flights from Heathrow to Idaho. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 858,174 searches. Data last updated 16 July 2026.
AirlineCheapestAverageFlexibilityOn-time
LufthansaCheapest£507Average£663FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
United AirlinesCheapest£551Average£696FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Virgin AtlanticCheapest£598Average£833FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
Alaska AirlinesCheapest£733Average£968FlexibilityNo cancel feeOn-time75%
Search Alaska Airlines flights

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travellers can enjoy low prices and a wide availability of flights to their desired destinations.

How does Cheapflights help users find flights from Heathrow to Idaho?

900+ travel sites are searched through when a user searches for a flight using Cheapflights. From the search interface, users can use filters to choose airlines, airports, flight times, cabin classes and more to their preference. Book your flight to Idaho from Heathrow today with Cheapflights!

Why should you use Cheapflights to find cheap flight tickets from Heathrow to Idaho?

It’s simple! Cheapflights, which is free to use for everyone, saves millions of users time and money every year by helping them find the cheapest and most suitable flights from Heathrow to Idaho.

Can Cheapflights find flights from Heathrow to Idaho with no change fees?

Certainly. Search results for flights to Idaho from Heathrow shown to you on Cheapflights can be narrowed down with different useful search filters, which includes flexible booking options.

Can Cheapflights notify me if prices for flights from Heathrow to Idaho become cheaper?

Yes, and it’s super simple to set up. Click the bell icon next to the flight deals above and provide a valid email address to enable Price Alerts. That’s it!

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