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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 10/28. Fares are subject to change and may not be available on all flights or dates of travel.
IDA — LON
nov. 22 — nov. 291
sáb. 11/22
sáb. 11/29
1 adult, Economy
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Cheap 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 octubre 23, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$601
(Air France)

One-way from

$399
(United Airlines)

Popular in

December

Cheapest in

March

Average price

$764
Provider with most accurate pricing for Idaho Falls Fanning Field-London (LON) flight deals.
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Provider most trusted by Cheapflights users for Idaho Falls Fanning Field-London (LON) flights.
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From Idaho Falls Fanning Field to London (LON)
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One-way flight from Idaho Falls Fanning Field to London (LON)
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Highest demand for flights based on searches. 21% potential increase in price ($288 potential increase over avg. RT price).
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Cheapest flight prices on average. 9% potential price decrease ($97 potential savings vs. average RT price).
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Average for round-trip flights in October 2025
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Find flight deals from Idaho Falls to London

Cheapest flights from Idaho Falls to London
Explore the most affordable flight options available from Idaho Falls to London. Find the lowest fares from popular airlines and budget airlines, with prices last updated on octubre 23, 2025.

This Air France deal was found by Cheapflights users on 10/21. 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 Air France is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 11/246:00 amIDA - LHR
1 stop21h 00mAir France
mié. 12/310:45 amLHR - IDA
1 stop14h 41mAir France
Deal found 10/21$601
This Delta deal was found by Cheapflights users on 10/21. 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.
dom. 11/236:57 pmIDA - LHR
2 stops30h 48mDelta
mié. 12/310:45 amLHR - IDA
1 stop14h 41mDelta
Deal found 10/21$605
This Delta deal was found by Cheapflights users on 10/22. 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.
dom. 12/77:06 pmIDA - LHR
1 stop31h 54mDelta
dom. 12/148:40 amLHR - IDA
2 stops44h 41mDelta
Deal found 10/22$622
This Delta deal was found by Cheapflights users on 10/21. 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.
lun. 11/246:00 amIDA - LHR
2 stops21h 30mDelta
mié. 12/34:35 pmLHR - IDA
2 stops27h 02mDelta
Deal found 10/21$625
This United Airlines deal was found by Cheapflights users on 10/21. 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.
mié. 12/310:58 amIDA - LHR
1 stop15h 42mUnited Airlines
lun. 12/811:10 amLHR - IDA
2 stops41h 02mUnited Airlines
Deal found 10/21$630
This United Airlines deal was found by Cheapflights users on 10/21. 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.
vie. 12/57:00 amIDA - LHR
2 stops16h 40mUnited Airlines
vie. 12/1211:10 amLHR - IDA
2 stops35h 14mUnited Airlines
Deal found 10/21$664
This Finnair deal was found by Cheapflights users on 10/21. 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.
dom. 12/71:58 pmIDA - LHR
1 stop14h 42mMultiple Airlines
dom. 12/144:30 pmLHR - IDA
1 stop27h 57mMultiple Airlines
Deal found 10/21$666

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 octubre 23, 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

dom. 11/23

6:57 pm-8:45 am

2 stops30h 48m

London Heathrow

mié. 12/3

4:35 pm-12:37 pm

2 stops27h 02m

$605

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

lun. 11/24

6:00 am-10:00 am

1 stop21h 00m

London Heathrow

mié. 12/3

11:20 am-10:21 pm

2 stops18h 01m

$605

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

dom. 12/7

7:06 pm-10:00 am

1 stop31h 54m

London Heathrow

dom. 12/14

8:40 am-10:21 pm

2 stops44h 41m

$622

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

mié. 12/3

10:58 am-9:40 am

1 stop15h 42m

London Heathrow

lun. 12/8

11:10 am-9:12 pm

2 stops41h 02m

$630

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

mar. 10/28

8:30 am-5:55 am

2 stops15h 25m

$399

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

mié. 10/29

10:50 am-9:40 am

1 stop16h 50m

$399

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

lun. 11/3

4:15 pm-9:40 am

1 stop34h 25m

$411

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

dom. 11/2

4:15 pm-10:55 pm

2 stops23h 40m

$426

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

lun. 11/3

8:52 pm-5:30 pm

3 stops37h 38m

$427

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

sáb. 11/1

2:45 pm-10:15 am

2 stops37h 30m

$438

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/21

Showing 1-10 of 13 results
1
2

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 October.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy2 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
eDreamsPrice Accuracy3 starsTrust Score*3 stars
AranGrantPrice Accuracy3 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 FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Idaho Falls-London flight deals on Cheapflights vs. FlightHub >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 FlightHub the most. FlightHub 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 octubre 23, 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 octubre 23, 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
8,995 reviews

Entertainment

7.1

Food

6.6

Comfort

7.3

Overall

7.4

Crew

8.1

Boarding

7.7

Reviews

1 / 20
4.0
Okay

Tim,Sep 2025

IAD - GSP

This was pretty bad. It’s chaos at the Dulles boarding gates for the small regional jets because they use one gate to board 3-4 flights at a time. So, it’s difficult knowing where and when to go. There is little space for any size of carrry-on, so most had to gate check their bags. However, the worst of it was that our single flight attendant fell asleep before we took off and the pilot couldn’t do so until she responded to his messages. My wife had to wake her up! So we were a little late leaving. Not to be thwarted, the flight attendant fell asleep right after take off and there was no sight of her during the flight. When the aircraft touched down, a tray of unsecured canned drinks came crashing onto the aisle up front. I can only assume someone didn’t do what they were supposed to. The pilot was great, but I’m sure he must not be happy with this crew member.
United Airlines
7.4
Good
8,995 reviews
United Airlines
7.4
Good
8,995 reviews

Entertainment

7.1

Food

6.6

Comfort

7.3

Overall

7.4

Crew

8.1

Boarding

7.7

Reviews

1 / 20
4.0
Okay

Tim,Sep 2025

IAD - GSP

This was pretty bad. It’s chaos at the Dulles boarding gates for the small regional jets because they use one gate to board 3-4 flights at a time. So, it’s difficult knowing where and when to go. There is little space for any size of carrry-on, so most had to gate check their bags. However, the worst of it was that our single flight attendant fell asleep before we took off and the pilot couldn’t do so until she responded to his messages. My wife had to wake her up! So we were a little late leaving. Not to be thwarted, the flight attendant fell asleep right after take off and there was no sight of her during the flight. When the aircraft touched down, a tray of unsecured canned drinks came crashing onto the aisle up front. I can only assume someone didn’t do what they were supposed to. The pilot was great, but I’m sure he must not be happy with this crew member.

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 $605, Delta can have you in London from Idaho Falls in 21h. The distance from Idaho Falls to London is about 4705 mi. Both multi-stop and nonstop flights can be found to your destination and back.

  • 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 35% 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?

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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 octubre 23, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$699Average$1,037FlexibilityNo cancel feeOn-time69%

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