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$399+ Cheap flights from Idaho Falls (IDA) to London (LON)

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 2/6. Fares are subject to change and may not be available on all flights or dates of travel.
IDA — LON
Jan 15 — Jan 221
Thu 1/15
Thu 1/22
1 adult, Economy
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Cheap flight deals from Idaho Falls to London

Best flights from Idaho Falls to London
Discover carefully curated flight deals from Idaho Falls to London that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated December 16, 2025.

This KLM deal was found by Cheapflights users on 12/16. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 1/301:15 pmIDA - LHR
1 stop13h 45mMultiple Airlines
Fri 2/66:20 amLHR - IDA
2 stops18h 31mMultiple Airlines
Deal found 12/16$627
This United Airlines deal was found by Cheapflights users on 12/15. 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.
Tue 2/34:19 pmIDA - LHR
1 stop34h 21mUnited Airlines
Tue 2/106:35 amLHR - IDA
2 stops39h 56mUnited Airlines
Deal found 12/15$629
This Delta deal was found by Cheapflights users on 12/15. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 1/126:35 pmIDA - LHR
2 stops15h 15mDelta
Sun 1/254:50 pmLHR - IDA
2 stops32h 01mDelta
Deal found 12/15$649
This United Airlines deal was found by Cheapflights users on 12/14. 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 1/302:40 pmIDA - LHR
1 stop12h 00mUnited Airlines
Tue 2/34:40 pmLHR - IDA
2 stops51h 50mUnited Airlines
Deal found 12/14$639
This Finnair deal was found by Cheapflights users on 12/15. 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 Finnair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 1/122:07 pmIDA - LHR
1 stop12h 53mMultiple Airlines
Sun 1/254:30 pmLHR - IDA
1 stop28h 07mMultiple Airlines
Deal found 12/15$649
This Delta deal was found by Cheapflights users on 12/15. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/75:40 amIDA - LHR
1 stop21h 10mDelta
Tue 4/1410:55 amLHR - IDA
1 stop18h 19mDelta
Deal found 12/15$673
This Finnair deal was found by Cheapflights users on 12/15. 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 Finnair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 2/32:07 pmIDA - LHR
1 stop15h 08mMultiple Airlines
Tue 2/102:20 pmLHR - IDA
1 stop15h 16mMultiple Airlines
Deal found 12/15$657

Find flight deals from Idaho Falls to London

Discover tips and strategies to find the most affordable flight options for your journey from Idaho Falls (IDA) to London (LON). 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 16, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$627
(KLM)

One-way from

$399
(United Airlines)

Popular in

June

Cheapest in

March

Average price

$1,050
Provider with most accurate pricing for Idaho Falls Fanning Field-London (LON) flight deals.
Search Deals
Provider most trusted by Cheapflights users for Idaho Falls Fanning Field-London (LON) flights.
Search Deals
From Idaho Falls Fanning Field to London (LON)
Search Deals
One-way flight from Idaho Falls Fanning Field to London (LON)
Search Deals
Highest demand for flights based on searches. 15% potential increase in price ($169 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($42 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 London 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 16, 2025.
Use the filters below to find and compare flights from Idaho Falls to London that are best for you.

Fly from

Idaho Falls

Fly to

London

Route

Depart

Return

Price

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Fri 1/30

1:15 pm-10:00 am

1 stop13h 45m

London Heathrow

Fri 2/6

6:20 am-5:51 pm

2 stops18h 31m

$627

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Tue 2/3

4:19 pm-9:40 am

1 stop34h 21m

London Heathrow

Tue 2/10

6:35 am-3:31 pm

2 stops39h 56m

$629

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Fri 1/30

2:40 pm-9:40 am

1 stop12h 00m

London Heathrow

Tue 2/3

4:40 pm-1:30 pm

2 stops51h 50m

$639

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Mon 1/12

6:35 pm-4:50 pm

2 stops15h 15m

London Heathrow

Sun 1/25

4:50 pm-5:51 pm

2 stops32h 01m

$649

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Mon 1/12

2:07 pm-10:00 am

1 stop12h 53m

London Heathrow

Sun 1/25

4:30 pm-1:37 pm

1 stop28h 07m

$649

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Tue 2/3

2:07 pm-12:15 pm

1 stop15h 08m

London Heathrow

Tue 2/10

2:20 pm-10:36 pm

1 stop15h 16m

$657

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Tue 4/7

5:40 am-9:50 am

1 stop21h 10m

London Heathrow

Tue 4/14

10:55 am-10:14 pm

1 stop18h 19m

$673

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/16

Compare providers for flights from Idaho Falls to London

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 London in December.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy2 starsTrust Score*3 stars
eDreamsPrice Accuracy3 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*1 star
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 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 flight deals on Cheapflights vs. eDreams >95% of the time. Price accuracy is based on data collected from Idaho Falls-London flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Idaho Falls-London 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 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 London

Have a flexible travel schedule? Discover the best time to fly to London 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

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

Currently, March is the cheapest month in which you can book a flight from Idaho Falls to London (average of $693). Flying from Idaho Falls to London 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 LON?

Find hourly flight availability from Idaho Falls to London. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated December 16, 2025.

It’s typically best to fly out from Idaho Falls to London in the morning. Doing so could potentially save you 34% on the flight price compared to flying at noon, which is usually more expensive.

Reviews of airlines servicing London

Get insights into the airlines that provide service to London. 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 London. Reviews last updated December 16, 2025.
Read reviews from past customers who have flown United Airlines from Idaho Falls to London. 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.
United Airlines
7.4
Good
9,092 reviews

Entertainment

7.1

Comfort

7.3

Food

6.6

Overall

7.4

Boarding

7.7

Crew

8.1

Reviews

1 / 20
10.0
Excellent

Sunderesh,Dec 2025

AUS - EWR

Smooth flight from Austin to Newark. The crew was friendly.
United Airlines
7.4
Good
9,092 reviews
United Airlines
7.4
Good
9,092 reviews

Entertainment

7.1

Comfort

7.3

Food

6.6

Overall

7.4

Boarding

7.7

Crew

8.1

Reviews

1 / 20
10.0
Excellent

Sunderesh,Dec 2025

AUS - EWR

Smooth flight from Austin to Newark. The crew was friendly.

Related info for your journey

Find useful and relevant information for your journey from Idaho Falls to London. 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?

    Located just 3.8 mi from the city center, Idaho Falls Fanning Field is the airport most travelers will use when flying to London from Idaho Falls. Booking flights from Fanning Field (IDA) to London should be relatively easy as there are 0 daily outbound flights to London from 1 airline.

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

    For as low as $629, United Airlines can have you in London from Idaho Falls in 34h 21m. The distance from Idaho Falls to London is about 4705 mi.

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

    Cheapflights users have booked flights from Idaho Falls to London round-trip from $699. You may be able to fly from Idaho Falls to London for 25% less than the average price by searching for this airline.

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

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

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

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

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

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

    Currently, March is the cheapest month in which you can book a flight from Idaho Falls to London (average of $693). Flying from Idaho Falls to London 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?

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

Browse thousands of different options on Cheapflights for your next trip

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Top airline flying from Idaho Falls to London

Discover the top airline that operate flights from Idaho Falls to London. 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 16, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$699Average$1,037FlexibilityNo cancel feeOn-time69%

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