Find flights
When to book
Airlines
FAQs

Cheap flights from London Heathrow Airport to Idaho from £391

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 20/10. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — BOI
5 Sep — 12 Sep1
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 6 August 2026.

Fri 4/906:40 -
2 stops20h 34m
Fri 11/913:00 -
2 stops19h 00m
Deal found 5/8£567
Fri 11/906:40 -
2 stops19h 00m
Sat 26/910:34 -
2 stops24h 06m
Deal found 4/8£581
Sat 12/906:40 -
2 stops18h 29m
Sat 19/913:00 -
3 stops19h 25m
Deal found 3/8£586
Fri 4/1206:40 -
2 stops23h 14m
Mon 7/1216:14 -
2 stops40h 46m
Deal found 4/8£590
Sat 31/1006:40 -
2 stops22h 24m
Sun 15/1116:14 -
2 stops19h 16m
Deal found 2/8£613
Tue 15/906:40 -
2 stops18h 29m
Tue 22/911:10 -
2 stops20h 50m
Deal found 1/8£660
Tue 6/1013:05 -
2 stops17h 54m
Sat 17/1006:43 -
2 stops22h 12m
Deal found 3/8£671
Tue 1/916:40 -
2 stops37h 56m
Tue 8/913:37 -
1 stop14h 48m
Deal found 4/8£685
Tue 8/914:50 -
2 stops36h 01m
Wed 16/905:00 -
1 stop23h 35m
Deal found 1/8£686
Wed 16/916:40 -
2 stops25h 50m
Wed 23/913:09 -
1 stop14h 01m
Deal found 2/8£688
Sat 12/909:55 -
1 stop20h 43m
Sat 19/907:00 -
2 stops20h 20m
Deal found 3/8£688
Tue 15/906:55 -
2 stops22h 19m
Tue 22/913:04 -
1 stop17h 06m
Deal found 1/8£706

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 6 August 2026.

Round-trip from

£567

One-way from

£391

Popular in

December

Cheapest in

January

Average price

£943
Scandinavian Airlines
  • Scandinavian Airlines
  • 4/9-11/9
  • 4 total stops
  • 39h 34m total
  • London to Idaho
Search Deals
20/10
  • 20/10
  • 3 total stops
  • 48h 00m total
  • London to Idaho
Search Deals
Highest demand for flights based on searches. 2% potential increase in price (£14 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 August 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 6 August 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 London Heathrow - GEG Spokane

LHRGEG

London Heathrow

Sat 12/9

06:40-17:09

2 stops18h 29m

Spokane

Sat 19/9

13:00-16:25

3 stops19h 25m

£586

LondonBoise

LHR London Heathrow - BOI Boise Air Term. Gowen Fld

LHRBOI

London Heathrow

Fri 4/12

06:40-22:54

2 stops23h 14m

Boise Air Term. Gowen Fld

Mon 7/12

16:14-16:00

2 stops40h 46m

£593

LondonBoise

LHR London Heathrow - BOI Boise Air Term. Gowen Fld

LHRBOI

London Heathrow

Sat 31/10

06:40-23:04

2 stops22h 24m

Boise Air Term. Gowen Fld

Sun 15/11

16:14-18:30

2 stops19h 16m

£613

LondonBoise

LHR London Heathrow - BOI Boise Air Term. Gowen Fld

LHRBOI

London Heathrow

Tue 6/10

13:05-23:59

2 stops17h 54m

Boise Air Term. Gowen Fld

Sat 17/10

06:43-11:55

2 stops22h 12m

£671

LondonSpokane

LHR London Heathrow - GEG Spokane

LHRGEG

London Heathrow

Tue 8/9

11:25-18:51

2 stops39h 26m

Spokane

Wed 16/9

05:00-07:15

2 stops18h 15m

£686

LondonSpokane

LHR London Heathrow - GEG Spokane

LHRGEG

London Heathrow

Wed 7/10

14:50-10:28

2 stops27h 38m

Spokane

Wed 14/10

13:38-12:35

1 stop14h 57m

£688

LondonSpokane

LHR London Heathrow - GEG Spokane

LHRGEG

London Heathrow

Wed 16/9

16:40-10:30

2 stops25h 50m

Spokane

Wed 23/9

13:09-11:10

1 stop14h 01m

£688

LondonSpokane

LHR London Heathrow - GEG Spokane

LHRGEG

London Heathrow

Fri 4/12

11:35-11:24

2 stops31h 49m

Spokane

Tue 8/12

11:30-07:55

1 stop12h 25m

£715

LondonSpokane

LHR London Heathrow - GEG Spokane

LHRGEG

London Heathrow

Thu 5/11

11:35-10:38

2 stops31h 03m

Spokane

Sun 8/11

13:00-07:25

1 stop34h 25m

£716

LondonBoise

LHR London Heathrow - BOI Boise Air Term. Gowen Fld

LHRBOI

London Heathrow

Fri 4/12

07:40-23:59

2 stops23h 19m

Boise Air Term. Gowen Fld

Mon 7/12

14:43-09:40

1 stop11h 57m

£716

Flights are sorted by cheapest return flights first.

Deals found on 2/8

Showing 1-10 of 53 resultsSorted by cheapest first
1
2
3
...
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, November is the cheapest month in which you can book a flight from London Heathrow Airport to Idaho (average of £598). Flying from London Heathrow Airport to Idaho in August is currently the most expensive (average of £1,133). 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?

Airfare is below average for this route at the moment.
London Heathrow Airport to Idaho flights typically cost between £999 and £1,170 in September.
The cheapest return price found within the last 5 days was £581 on Scandinavian Airlines (11 Sept–26 Sept).

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 6 August 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
12,772 reviews
Check prices

Crew

8.5

Comfort

7.8

Overall

7.9

Food

7.0

Entertainment

7.0

Boarding

8.1

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
12,772 reviews
Alaska Airlines
7.9
Good
12,772 reviews
Check prices

Crew

8.5

Comfort

7.8

Overall

7.9

Food

7.0

Entertainment

7.0

Boarding

8.1

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
694 reviews
Alaska Airlines
7.9
Good
12,772 reviews
Check prices

Crew

8.5

Comfort

7.8

Overall

7.9

Food

7.0

Entertainment

7.0

Boarding

8.1

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
10,072 reviews
Alaska Airlines
7.9
Good
12,772 reviews
Check prices

Crew

8.5

Comfort

7.8

Overall

7.9

Food

7.0

Entertainment

7.0

Boarding

8.1

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
8,176 reviews
Alaska Airlines
7.9
Good
12,772 reviews
Check prices

Crew

8.5

Comfort

7.8

Overall

7.9

Food

7.0

Entertainment

7.0

Boarding

8.1

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 £586, 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 - Boise Air Term. Gowen Fld or London Heathrow - Jackson Hole, London Heathrow - Spokane 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, November is the cheapest month in which you can book a flight from London Heathrow Airport to Idaho (average of £598). Flying from London Heathrow Airport to Idaho in August is currently the most expensive (average of £1,133). 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

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Heathrow to Idaho

See prices for flight routes from nearby airports that may be better suited for you.
Heathrow to John F Kennedy Intl flights
Heathrow to Newark flights
Gatwick to John F Kennedy Intl flights
Heathrow to LaGuardia flights
Gatwick to Newark flights
Stansted to John F Kennedy Intl flights
London City to John F Kennedy Intl flights
Heathrow to Orlando flights
Heathrow to Miami flights
Heathrow to Los Angeles flights
Gatwick to LaGuardia flights
Luton to John F Kennedy Intl flights
Stansted to Newark flights
Luton to Newark flights
Heathrow to Dallas/Fort Worth flights
London City to Newark flights
Heathrow to Boston flights
Heathrow to O'Hare Intl flights
Heathrow to Atlanta flights
Gatwick to Orlando flights
Heathrow to San Francisco flights
Heathrow to Dulles Intl flights
Heathrow to Las Vegas flights
Gatwick to Miami flights
Heathrow to Baltimore flights
Gatwick to Los Angeles flights
Stansted to Orlando flights
Heathrow to Hobby flights
Stansted to Miami flights
London City to Miami flights
Stansted to Los Angeles flights
London City to Orlando flights
London City to Los Angeles flights
Heathrow to Seattle flights
Heathrow to George Bush Intcntl flights
Gatwick to Boston flights
Heathrow to Tampa flights
Gatwick to Dulles Intl flights
Luton to Miami flights
London City to Boston flights
Heathrow to Denver flights
Stansted to Dulles Intl flights
Gatwick to O'Hare Intl flights
Heathrow to Ontario flights
Luton to Los Angeles flights
Stansted to O'Hare Intl flights
Gatwick to Dallas/Fort Worth flights
London City to O'Hare Intl flights
Stansted to Boston flights
Heathrow to Midway flights

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 6 August 2026.
AirlineCheapestAverageFlexibilityOn-time
LufthansaCheapest£506Average£745FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
United AirlinesCheapest£550Average£920FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Virgin AtlanticCheapest£598Average£832FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
Alaska AirlinesCheapest£733Average£946FlexibilityNo 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!

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.