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$340+ Cheap flights from Idaho Falls (IDA) to Heathrow (LHR)

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 3/8. Fares are subject to change and may not be available on all flights or dates of travel.
IDA — LHR
Jan 25 — Feb 11
Sun 1/25
Sun 2/1
1 adult, Economy
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Cheap flight deals from Idaho Falls to Heathrow

Best flights from Idaho Falls to Heathrow
Discover carefully curated flight deals from Idaho Falls to Heathrow that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated December 26, 2025.

This United Airlines deal was found by Cheapflights users on 12/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 1/224:19 pmIDA - LHR
1 stop34h 21mUnited Airlines
Tue 1/276:35 amLHR - IDA
2 stops34h 21mUnited Airlines
Deal found 12/25$630
This United Airlines deal was found by Cheapflights users on 12/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 1/232:40 pmIDA - LHR
1 stop12h 00mUnited Airlines
Tue 1/276:35 amLHR - IDA
2 stops34h 21mUnited Airlines
Deal found 12/25$630
This United Airlines deal was found by Cheapflights users on 12/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 1/232:40 pmIDA - LHR
1 stop12h 00mUnited Airlines
Wed 1/286:35 amLHR - IDA
2 stops34h 21mUnited Airlines
Deal found 12/25$630
This United Airlines deal was found by Cheapflights users on 12/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 1/226:30 amIDA - LHR
1 stop20h 10mUnited Airlines
Thu 1/296:35 amLHR - IDA
2 stops34h 21mUnited Airlines
Deal found 12/25$630
This United Airlines deal was found by Cheapflights users on 12/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 1/214:19 pmIDA - LHR
1 stop34h 21mUnited Airlines
Sun 1/2511:10 amLHR - IDA
2 stops57h 20mUnited Airlines
Deal found 12/23$639
This United Airlines deal was found by Cheapflights users on 12/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 1/232:40 pmIDA - LHR
1 stop12h 00mUnited Airlines
Mon 1/2611:10 amLHR - IDA
2 stops33h 20mUnited Airlines
Deal found 12/25$642
This United Airlines deal was found by Cheapflights users on 12/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 1/232:40 pmIDA - LHR
1 stop12h 00mUnited Airlines
Fri 1/3011:35 amLHR - IDA
1 stop29h 21mUnited Airlines
Deal found 12/25$650

Find flight deals from Idaho Falls to Heathrow

Discover tips and strategies to find the most affordable flight options for your journey from Idaho Falls (IDA) to Heathrow (LHR). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated December 26, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$622
(KLM)

One-way from

$378
(Kiwi.com)

Popular in

June

Cheapest in

March

Average price

$703
Provider with most accurate pricing for Idaho Falls Fanning Field-London Heathrow flight deals.
Search Deals
Provider most trusted by Cheapflights users for Idaho Falls Fanning Field-London Heathrow flights.
Search Deals
From Idaho Falls Fanning Field to London Heathrow
Search Deals
One-way flight from Idaho Falls Fanning Field to London Heathrow
Search Deals
Highest demand for flights based on searches. 21% potential increase in price ($248 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 7% potential price decrease ($69 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Idaho Falls to Heathrow 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 2,558,603 searches. Data last updated December 26, 2025.
Use the filters below to find and compare flights from Idaho Falls to London Heathrow Airport that are best for you.

Fly from

Idaho Falls

Fly to

Heathrow

Route

Depart

Return

Price

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Thu 1/22

4:19 pm-9:40 am

1 stop34h 21m

London Heathrow

Tue 1/27

6:35 am-9:56 am

2 stops34h 21m

$630

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Fri 1/23

2:40 pm-9:40 am

1 stop12h 00m

London Heathrow

Tue 1/27

6:35 am-9:56 am

2 stops34h 21m

$630

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Fri 1/23

2:40 pm-9:40 am

1 stop12h 00m

London Heathrow

Wed 1/28

6:35 am-9:56 am

2 stops34h 21m

$630

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Thu 1/22

6:30 am-9:40 am

1 stop20h 10m

London Heathrow

Thu 1/29

6:35 am-9:56 am

2 stops34h 21m

$630

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Wed 1/21

4:19 pm-9:40 am

1 stop34h 21m

London Heathrow

Sun 1/25

11:10 am-1:30 pm

2 stops57h 20m

$639

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Fri 1/23

2:40 pm-9:40 am

1 stop12h 00m

London Heathrow

Mon 1/26

11:10 am-1:30 pm

2 stops33h 20m

$642

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Fri 1/23

2:40 pm-9:40 am

1 stop12h 00m

London Heathrow

Fri 1/30

11:35 am-9:56 am

1 stop29h 21m

$650

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Sun 3/8

7:12 pm-12:50 pm

2 stops59h 38m

$340

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Fri 3/6

4:21 pm-12:50 pm

2 stops37h 29m

$378

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Thu 3/5

7:12 pm-12:50 pm

3 stops58h 38m

$382

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/25

Showing 1-10 of 16 results
1
2

Compare providers for flights from Idaho Falls to Heathrow

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Idaho Falls to Heathrow in December.
ProviderPrice AccuracyTrust Score*
FlightHubPrice Accuracy3 starsTrust Score*1 star
eDreamsPrice Accuracy3 starsTrust Score*3 stars
AranGrantPrice Accuracy2 starsTrust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Idaho Falls-London Heathrow Airport flights, users find the pricing of eDreams to be most consistent on Cheapflights vs. eDreams Users can find the same prices on Idaho Falls-London Heathrow Airport flight deals on Cheapflights vs. eDreams >95% of the time. Price accuracy is based on data collected from Idaho Falls-London Heathrow Airport flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Idaho Falls-London Heathrow Airport flights, Cheapflights users trust eDreams the most. eDreams has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Idaho Falls-London Heathrow Airport flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from Idaho Falls to Heathrow

Have a flexible travel schedule? Discover the best time to fly to Heathrow from Idaho Falls with our price prediction graph.
Estimated round-trip 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 Idaho Falls to London Heathrow Airport

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

Currently, March is the cheapest month in which you can book a flight from Idaho Falls to London Heathrow Airport (average of $693). Flying from Idaho Falls to London Heathrow Airport in June is currently the most expensive (average of $1,127). 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.

What is the cheapest time of day to fly from IDA to LHR?

Find hourly flight availability from Idaho Falls to Heathrow. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated December 26, 2025.

Unlike at noon, when flights are generally more expensive, you can save up to 34% on flights from Idaho Falls to London Heathrow Airport by exploring options for tickets in the morning.

Reviews of airlines servicing Heathrow

Get insights into the airlines that provide service to Heathrow. 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 Heathrow. Reviews last updated December 26, 2025.
Get a feel of what it's like to fly with United Airlines from Idaho Falls to London Heathrow Airport by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
United Airlines
7.4
Good
9,115 reviews

Comfort

7.3

Entertainment

7.1

Overall

7.4

Crew

8.1

Food

6.6

Boarding

7.7

Reviews

1 / 20
10.0
Excellent

Michelle,Dec 2025

DEN - MKE

I liked that the plane waited 5 minutes for a family whose incoming plane was late. This was the last flight of the day to MKE. Flight attendants actually checked in throughout the flight. Although, not really friendly. Happy to see screens on seat backs again. This is my first time not flying first class in over 10 years. It was economy plus.
United Airlines
7.4
Good
9,115 reviews
United Airlines
7.4
Good
9,115 reviews

Comfort

7.3

Entertainment

7.1

Overall

7.4

Crew

8.1

Food

6.6

Boarding

7.7

Reviews

1 / 20
10.0
Excellent

Michelle,Dec 2025

DEN - MKE

I liked that the plane waited 5 minutes for a family whose incoming plane was late. This was the last flight of the day to MKE. Flight attendants actually checked in throughout the flight. Although, not really friendly. Happy to see screens on seat backs again. This is my first time not flying first class in over 10 years. It was economy plus.

Related info for your journey

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

  • What airport do you fly from for flights from Idaho Falls to London Heathrow?

    Idaho Falls Fanning Field (IDA), located 3.8 mi from the city center, is the airport you fly out of when you book flights from Idaho Falls to London Heathrow. 1 airline have flights from Fanning Field to London Heathrow on a regular basis. Booking flights from Idaho Falls Fanning Field to London Heathrow should not be difficult; the airport handles an average of 0 outbound flights to London Heathrow per day.

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

    KLM and United Airlines can get you from Idaho Falls to London Heathrow Airport in just under 12h. Your travel time can differ by up to 1h 45m. Idaho Falls and London Heathrow Airport are separated by a distance of 4705 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

  • What is the cheapest airline to fly from Idaho Falls to London Heathrow Airport round-trip?

    United Airlines, at $699, was found to be the cheapest airline from Idaho Falls to London Heathrow Airport.. United Airlines is priced at 24% lower than the current average price of a flight leaving 3 months from now.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Idaho Falls to Heathrow 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 Idaho Falls to London Heathrow Airport?

    Currently, March is the cheapest month in which you can book a flight from Idaho Falls to London Heathrow Airport (average of $693). Flying from Idaho Falls to London Heathrow Airport in June is currently the most expensive (average of $1,127). 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

Traveling to a place near London Heathrow Airport?

Book flights to London Heathrow Airport if you plan to visit one of these locations
Ilford
Hounslow
Southend-on-Sea
Harrow
Eastleigh
Dartford
Dover
Winchester
Croydon
Hayes
Orpington
Northampton
Watford
Borehamwood
Broadway
Aylesbury
Chipping Norton
Horley
Kingston upon Thames
Folkestone

Browse thousands of different options on Cheapflights for your next trip

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Top airline flying from Idaho Falls to Heathrow

Discover the top airline that operate flights from Idaho Falls to Heathrow. 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 2,558,603 searches. Data last updated December 26, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$699Average$1,037FlexibilityNo cancel feeOn-time69%

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