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Cheap flights from London Heathrow Airport to Idaho from £445

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 28/10. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — BOI
9 Aug — 16 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 10 July 2026.

Fri 18/917:00
LHR
-
BOI
2 stops36h 34m
Scandinavian Airlines
Fri 25/912:14
BOI
-
LHR
2 stops38h 06m
Scandinavian Airlines
Deal found 6/7£570
Tue 8/906:40
LHR
-
GEG
2 stops18h 29m
Scandinavian Airlines
Tue 6/1013:00
GEG
-
LHR
2 stops20h 40m
Scandinavian Airlines
Deal found 6/7£580
Thu 10/917:00
LHR
-
BOI
2 stops36h 34m
Scandinavian Airlines
Mon 14/916:00
BOI
-
LHR
2 stops41h 00m
Scandinavian Airlines
Deal found 5/7£590
Wed 16/914:10
LHR
-
BOI
2 stops27h 56m
United Airlines
Wed 23/910:31
BOI
-
LHR
2 stops18h 04m
United Airlines
Deal found 7/7£633
Tue 8/907:25
LHR
-
GEG
2 stops19h 51m
United Airlines
Tue 6/1013:38
GEG
-
LHR
1 stop14h 47m
United Airlines
Deal found 6/7£658
Tue 18/806:40
LHR
-
GEG
2 stops20h 34m
Scandinavian Airlines
Tue 25/813:00
GEG
-
LHR
2 stops20h 40m
Scandinavian Airlines
Deal found 8/7£673
Tue 29/911:25
LHR
-
GEG
1 stop17h 24m
Lufthansa
Tue 6/1013:05
GEG
-
LHR
1 stop14h 05m
Lufthansa
Deal found 9/7£676
Fri 21/819:30
LHR
-
GEG
2 stops29h 30m
Scandinavian Airlines
Sat 29/813:00
GEG
-
LHR
3 stops21h 50m
Scandinavian Airlines
Deal found 10/7£684
Thu 10/907:25
LHR
-
BOI
2 stops18h 54m
United Airlines
Mon 14/910:31
BOI
-
LHR
1 stop16h 09m
United Airlines
Deal found 5/7£688
Fri 18/914:10
LHR
-
BOI
2 stops32h 21m
United Airlines
Fri 25/917:30
BOI
-
LHR
1 stop11h 55m
United Airlines
Deal found 6/7£695
Mon 14/917:00
LHR
-
IDA
1 stop29h 20m
Alaska Airlines
Mon 28/914:01
IDA
-
LHR
1 stop18h 04m
Alaska Airlines
Deal found 8/7£749
Tue 1/909:15
LHR
-
IDA
2 stops19h 05m
Finnair
Fri 25/907:00
IDA
-
LHR
2 stops20h 15m
Finnair
Deal found 10/7£776

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 10 July 2026.

Round-trip from

£570

One-way from

£445

Popular in

December

Cheapest in

January

Average price

£919
Scandinavian Airlines
  • Scandinavian Airlines
  • 18/9-25/9
  • 4 total stops
  • 74h 40m total
  • London to Idaho
Search Deals
28/10
  • 28/10
  • 3 total stops
  • 40h 38m total
  • London to Idaho
Search Deals
Highest demand for flights based on searches. 5% potential increase in price (£32 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease (£26 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 10 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

06:40-17:09

2 stops18h 29m

Spokane

Tue 6/10

13:00-17:40

2 stops20h 40m

£580

LondonSpokane

LHR - GEG

LHRGEG

London Heathrow

Tue 15/9

07:05-18:50

3 stops19h 45m

Spokane

Sun 20/9

13:00-16:25

3 stops19h 25m

£586

LondonBoise

LHR - BOI

LHRBOI

London Heathrow

Fri 18/9

21:05-18:40

3 stops28h 35m

Boise Air Term. Gowen Fld

Fri 25/9

12:14-18:30

3 stops23h 16m

£627

LondonSpokane

LHR - GEG

LHRGEG

London Heathrow

Tue 8/9

07:25-19:16

2 stops19h 51m

Spokane

Tue 6/10

13:38-12:25

1 stop14h 47m

£658

LondonSpokane

LHR - GEG

LHRGEG

London Heathrow

Thu 1/10

06:55-20:49

2 stops21h 54m

Spokane

Mon 5/10

16:08-09:40

1 stop33h 32m

£688

LondonBoise

LHR - BOI

LHRBOI

London Heathrow

Wed 16/9

06:55-21:37

2 stops21h 42m

Boise Air Term. Gowen Fld

Wed 23/9

12:28-11:55

1 stop16h 27m

£698

LondonBoise

LHR - BOI

LHRBOI

London Heathrow

Thu 10/9

10:35-19:19

1 stop15h 44m

Boise Air Term. Gowen Fld

Mon 14/9

17:40-12:25

1 stop11h 45m

£713

LondonBoise

LHR - BOI

LHRBOI

London Heathrow

Fri 25/9

07:05-18:39

3 stops18h 34m

Boise Air Term. Gowen Fld

Wed 7/10

16:00-17:40

2 stops18h 40m

£721

LondonBoise

LHR - BOI

LHRBOI

London Heathrow

Fri 23/10

14:05-12:58

2 stops29h 53m

Boise Air Term. Gowen Fld

Fri 6/11

08:22-07:25

1 stop16h 03m

£744

LondonBoise

LHR - BOI

LHRBOI

London Heathrow

Fri 18/9

13:00-21:31

1 stop15h 31m

Boise Air Term. Gowen Fld

Fri 25/9

08:08-09:00

1 stop17h 52m

£747

Flights are sorted by cheapest return flights first.

Deals found on 5/7

Showing 1-10 of 57 resultsSorted by cheapest first
1
2
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6

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 £509). Flying from London Heathrow Airport to Idaho in January is currently the most expensive (average of £787). 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 10 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
12,646 reviews
Check prices

Crew

8.5

Entertainment

7.0

Food

7.1

Comfort

7.8

Boarding

8.1

Overall

7.9

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
12,646 reviews
Alaska Airlines
7.9
Good
12,646 reviews
Check prices

Crew

8.5

Entertainment

7.0

Food

7.1

Comfort

7.8

Boarding

8.1

Overall

7.9

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
12,646 reviews
Check prices

Crew

8.5

Entertainment

7.0

Food

7.1

Comfort

7.8

Boarding

8.1

Overall

7.9

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
9,964 reviews
Alaska Airlines
7.9
Good
12,646 reviews
Check prices

Crew

8.5

Entertainment

7.0

Food

7.1

Comfort

7.8

Boarding

8.1

Overall

7.9

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
8,127 reviews
Alaska Airlines
7.9
Good
12,646 reviews
Check prices

Crew

8.5

Entertainment

7.0

Food

7.1

Comfort

7.8

Boarding

8.1

Overall

7.9

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 £580, Scandinavian Airlines can have you in Idaho from London Heathrow Airport in 18h 29m. Airlines will cover a distance of 4643 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 - Spokane or London Heathrow - Jackson Hole, London Heathrow - Idaho Falls Fanning Field 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 £509). Flying from London Heathrow Airport to Idaho in January is currently the most expensive (average of £787). 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 10 July 2026.
AirlineCheapestAverageFlexibilityOn-time
LufthansaCheapest£509Average£666FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
United AirlinesCheapest£553Average£699FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Virgin AtlanticCheapest£600Average£836FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
Alaska AirlinesCheapest£736Average£972FlexibilityNo 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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