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$335+ 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 10/27. Fares are subject to change and may not be available on all flights or dates of travel.
IDA — LON
oct. 16 — oct. 231
jue. 10/16
jue. 10/23
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 septiembre 16, 2025.

Round-trip from

$685
(Delta)

One-way from

$335
(Kiwi.com)

Popular in

December

Cheapest in

March

Average price

$1,049
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 September 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 septiembre 16, 2025.

This Delta deal was found by Cheapflights users on 9/15. 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.
lun. 10/131:15 pmIDA - LHR
1 stop13h 35mDelta
lun. 10/208:10 pmLHR - IDA
2 stops23h 23mDelta
Deal found 9/15$685
This Delta deal was found by Cheapflights users on 9/15. 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.
lun. 9/226:51 pmIDA - LHR
2 stops18h 09mDelta
lun. 9/298:25 pmLHR - IDA
2 stops23h 01mDelta
Deal found 9/15$725
This United Airlines deal was found by Cheapflights users on 9/15. 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.
lun. 9/225:56 pmIDA - LHR
1 stop11h 24mUnited Airlines
lun. 9/295:40 pmLHR - IDA
2 stops30h 38mUnited Airlines
Deal found 9/15$727
This United Airlines deal was found by Cheapflights users on 9/16. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 10/315:00 amIDA - LHR
2 stops20h 30mUnited Airlines
vie. 11/711:35 amLHR - IDA
1 stop18h 17mUnited Airlines
Deal found 9/16$748
This American Airlines deal was found by Cheapflights users on 9/16. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 10/313:50 pmIDA - LHR
1 stop14h 30mMultiple Airlines
vie. 11/72:25 pmLHR - IDA
1 stop15h 09mMultiple Airlines
Deal found 9/16$762
This oojo deal was found by Cheapflights users on 9/15. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 11/203:50 pmIDA - LHR
1 stop13h 30mMultiple Airlines
jue. 11/272:55 pmLHR - IDA
1 stop30h 42mMultiple Airlines
Deal found 9/15$3,813

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 septiembre 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

lun. 10/13

1:15 pm-9:50 am

1 stop13h 35m

London Heathrow

lun. 10/20

8:10 pm-12:33 pm

2 stops23h 23m

$685

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

jue. 10/30

5:00 am-9:40 am

1 stop22h 40m

London Heathrow

jue. 11/6

6:00 pm-10:52 pm

2 stops35h 52m

$727

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

vie. 10/31

5:00 am-7:30 am

2 stops20h 30m

London Heathrow

vie. 11/7

1:00 pm-5:46 pm

2 stops35h 46m

$731

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

lun. 10/13

2:35 pm-9:40 am

1 stop12h 05m

London Heathrow

lun. 10/20

11:25 am-8:52 pm

1 stop16h 27m

$743

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

vie. 10/31

3:50 pm-12:20 pm

1 stop14h 30m

London Heathrow

vie. 11/7

2:25 pm-10:34 pm

1 stop15h 09m

$762

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

jue. 11/20

3:50 pm-12:20 pm

1 stop13h 30m

London Heathrow

jue. 11/27

2:55 pm-2:37 pm

1 stop30h 42m

$3,813

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

lun. 10/27

3:50 pm-5:30 pm

3 stops43h 40m

$335

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

lun. 10/13

7:40 pm-5:45 pm

3 stops39h 05m

$447

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

mar. 11/25

7:10 am-1:15 pm

1 stop23h 05m

$449

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

lun. 10/27

1:11 pm-11:35 am

1 stop16h 24m

$449

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/16

Showing 1-10 of 15 results
1
2

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, November is the cheapest month in which you can book a flight from Idaho Falls to London (average of $661). Flying from Idaho Falls to London in June is currently the most expensive (average of $1,097). 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 septiembre 16, 2025.

It’s typically best to fly out from Idaho Falls to London in the afternoon. Doing so could potentially save you 36% on the flight price compared to flying in the morning, 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 septiembre 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
8,924 reviews

Comfort

7.3

Food

6.6

Crew

8.1

Boarding

7.7

Overall

7.4

Entertainment

7.1

Reviews

1 / 20
4.0
Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??
United Airlines
7.4
Good
8,924 reviews
United Airlines
7.4
Good
8,924 reviews

Comfort

7.3

Food

6.6

Crew

8.1

Boarding

7.7

Overall

7.4

Entertainment

7.1

Reviews

1 / 20
4.0
Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??

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 2 different airlines.

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

    For as low as $685, Delta can have you in London from Idaho Falls in 13h 35m. 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 are the cheapest airlines flying from Idaho Falls to London round-trip?

    Cheapflights users have booked flights from Idaho Falls to London round-trip from $691. Another airline that can offer you cheap pricing is United Airlines. You may be able to fly from Idaho Falls to London for 36% less than the average price by searching for these airlines.

  • 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, November is the cheapest month in which you can book a flight from Idaho Falls to London (average of $661). Flying from Idaho Falls to London in June is currently the most expensive (average of $1,097). 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 2 airlines flying from Idaho Falls to London

Discover the top 2 airlines 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 septiembre 16, 2025.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$691Average$1,200FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$699Average$1,037FlexibilityNo cancel feeOn-time69%

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