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Cheap flights from London Heathrow Airport to Idaho from £402

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 18/9. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — BOI
26 Jun — 3 Jul1
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 27 May 2026.

Tue 8/906:55
LHR
-
GEG
2 stops22h 19m
United Airlines
Tue 15/911:00
GEG
-
LHR
1 stop16h 55m
United Airlines
Deal found 22/5£658
Tue 8/914:50
LHR
-
GEG
1 stop14h 24m
Lufthansa
Tue 15/913:37
GEG
-
LHR
1 stop14h 48m
Lufthansa
Deal found 22/5£675
Sat 26/908:30
LHR
-
BOI
2 stops21h 30m
Multiple Airlines
Sat 10/1007:26
BOI
-
LHR
2 stops19h 34m
Multiple Airlines
Deal found 25/5£678
Mon 7/909:30
LHR
-
GEG
2 stops19h 16m
United Airlines
Tue 15/913:09
GEG
-
LHR
1 stop14h 01m
United Airlines
Deal found 22/5£682
Thu 10/907:25
LHR
-
GEG
2 stops23h 16m
United Airlines
Mon 14/915:54
GEG
-
LHR
1 stop33h 46m
United Airlines
Deal found 24/5£688
Sat 5/914:50
LHR
-
GEG
1 stop13h 56m
United Airlines
Sun 13/915:54
GEG
-
LHR
1 stop33h 46m
United Airlines
Deal found 22/5£712
Mon 5/1017:00
LHR
-
IDA
1 stop29h 35m
Alaska Airlines
Tue 13/1006:09
IDA
-
LHR
1 stop25h 56m
Alaska Airlines
Deal found 23/5£715
Sat 26/911:25
LHR
-
BOI
1 stop13h 33m
Lufthansa
Sat 10/1012:29
BOI
-
LHR
1 stop16h 26m
Lufthansa
Deal found 25/5£717
Fri 11/909:30
LHR
-
GEG
2 stops35h 05m
Air Canada
Tue 15/913:37
GEG
-
LHR
2 stops32h 58m
Air Canada
Deal found 22/5£721
Mon 22/611:25
LHR
-
BOI
1 stop17h 10m
United Airlines
Sun 28/608:25
BOI
-
LHR
1 stop17h 35m
United Airlines
Deal found 26/5£724
Sat 5/917:40
LHR
-
GEG
2 stops29h 26m
Air Canada
Wed 16/913:37
GEG
-
LHR
2 stops32h 58m
Air Canada
Deal found 22/5£725
Sat 26/906:40
LHR
-
BOI
2 stops22h 45m
Scandinavian Airlines
Sat 10/1012:42
BOI
-
LHR
3 stops21h 18m
Scandinavian Airlines
Deal found 25/5£731

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 27 May 2026.

Round-trip from

£678

One-way from

£402

Popular in

December

Cheapest in

January

Average price

£674
26/9-10/10
  • 26/9-10/10
  • 4 total stops
  • 41h 04m total
  • London to Idaho
Search Deals
United Airlines
  • United Airlines
  • 18/9
  • 1 total stop
  • 13h 47m total
  • London to Idaho
Search Deals
Highest demand for flights based on searches. 8% potential increase in price (£49 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 5% potential price decrease (£29 potential savings vs. average return price).
Search Deals
Average for round-trip flights in May 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 27 May 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

09:30-21:14

2 stops19h 44m

Spokane

Wed 16/9

05:00-05:55

2 stops16h 55m

£682

LondonSpokane

LHR - GEG

LHRGEG

London Heathrow

Mon 7/9

14:50-20:46

1 stop13h 56m

Spokane

Sun 13/9

15:54-09:40

1 stop33h 46m

£682

LondonSpokane

LHR - GEG

LHRGEG

London Heathrow

Thu 10/9

07:25-22:41

2 stops23h 16m

Spokane

Mon 14/9

15:54-09:40

1 stop33h 46m

£688

LondonSpokane

LHR - GEG

LHRGEG

London Heathrow

Sat 5/9

14:50-20:46

1 stop13h 56m

Spokane

Sun 13/9

15:54-09:40

1 stop33h 46m

£712

LondonIdaho Falls

LHR - IDA

LHRIDA

London Heathrow

Mon 5/10

17:00-15:35

1 stop29h 35m

Idaho Falls Fanning Field

Thu 15/10

06:09-15:05

1 stop25h 56m

£715

LondonBoise

LHR - BOI

LHRBOI

London Heathrow

Tue 7/7

07:30-17:56

2 stops17h 26m

Boise Air Term. Gowen Fld

Tue 14/7

14:40-09:40

1 stop12h 00m

£755

LondonBoise

LHR - BOI

LHRBOI

London Heathrow

Tue 23/6

11:05-22:56

1 stop18h 51m

Boise Air Term. Gowen Fld

Sun 5/7

12:28-06:45

1 stop35h 17m

£774

LondonBoise

LHR - BOI

LHRBOI

London Heathrow

Tue 23/6

18:00-11:32

2 stops24h 32m

Boise Air Term. Gowen Fld

Sat 4/7

19:05-20:40

2 stops18h 35m

£800

LondonIdaho Falls

LHR - IDA

LHRIDA

London Heathrow

Mon 5/10

17:45-12:27

2 stops25h 42m

Idaho Falls Fanning Field

Thu 15/10

13:10-14:00

2 stops17h 50m

£818

LondonIdaho Falls

LHR - IDA

LHRIDA

London Heathrow

Mon 5/10

17:00-15:35

1 stop29h 35m

Idaho Falls Fanning Field

Sun 11/10

13:46-15:05

1 stop18h 19m

£822

Flights are sorted by cheapest return flights first.

Deals found on 22/5

Showing 1-10 of 43 resultsSorted by cheapest first
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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 £506). Flying from London Heathrow Airport to Idaho in January is currently the most expensive (average of £783). 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 27 May 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
12,422 reviews
Check prices

Overall

7.9

Crew

8.5

Boarding

8.1

Entertainment

7.0

Food

7.1

Comfort

7.8

Reviews

1 / 20
8.0
Excellent

Eugene,Mar 2026

MFR - SEA

Alaska Airlines is is always good. There where few choices of what to drink, and no food. No blankets, no pillows, and you h ats ok. I just had open heart surgery And i could have used something. But the flight and the crew where exelent. So all is well
Alaska Airlines
7.9
Good
12,422 reviews
Alaska Airlines
7.9
Good
12,422 reviews
Check prices

Overall

7.9

Crew

8.5

Boarding

8.1

Entertainment

7.0

Food

7.1

Comfort

7.8

Reviews

1 / 20
8.0
Excellent

Eugene,Mar 2026

MFR - SEA

Alaska Airlines is is always good. There where few choices of what to drink, and no food. No blankets, no pillows, and you h ats ok. I just had open heart surgery And i could have used something. But the flight and the crew where exelent. So all is well
Virgin Atlantic
7.5
Good
689 reviews
Alaska Airlines
7.9
Good
12,422 reviews
Check prices

Overall

7.9

Crew

8.5

Boarding

8.1

Entertainment

7.0

Food

7.1

Comfort

7.8

Reviews

1 / 20
8.0
Excellent

Eugene,Mar 2026

MFR - SEA

Alaska Airlines is is always good. There where few choices of what to drink, and no food. No blankets, no pillows, and you h ats ok. I just had open heart surgery And i could have used something. But the flight and the crew where exelent. So all is well
United Airlines
7.4
Good
9,749 reviews
Alaska Airlines
7.9
Good
12,422 reviews
Check prices

Overall

7.9

Crew

8.5

Boarding

8.1

Entertainment

7.0

Food

7.1

Comfort

7.8

Reviews

1 / 20
8.0
Excellent

Eugene,Mar 2026

MFR - SEA

Alaska Airlines is is always good. There where few choices of what to drink, and no food. No blankets, no pillows, and you h ats ok. I just had open heart surgery And i could have used something. But the flight and the crew where exelent. So all is well
Lufthansa
6.8
Okay
8,032 reviews
Alaska Airlines
7.9
Good
12,422 reviews
Check prices

Overall

7.9

Crew

8.5

Boarding

8.1

Entertainment

7.0

Food

7.1

Comfort

7.8

Reviews

1 / 20
8.0
Excellent

Eugene,Mar 2026

MFR - SEA

Alaska Airlines is is always good. There where few choices of what to drink, and no food. No blankets, no pillows, and you h ats ok. I just had open heart surgery And i could have used something. But the flight and the crew where exelent. So all is well

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 £755, United Airlines can have you in Idaho from London Heathrow Airport in 17h 26m. Airlines will cover a distance of 4829 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 - Jackson Hole or London Heathrow - Boise Air Term. Gowen Fld, 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 £506). Flying from London Heathrow Airport to Idaho in January is currently the most expensive (average of £783). 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

Browse thousands of different options on Cheapflights for your next trip

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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 27 May 2026.
AirlineCheapestAverageFlexibilityOn-time
LufthansaCheapest£506Average£692FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
United AirlinesCheapest£545Average£678FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Virgin AtlanticCheapest£598Average£832FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
Alaska AirlinesCheapest£832Average£1,114FlexibilityNo 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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