How long is the flight from Idaho Falls to London?

For as low as $726, KLM can have you in London from Idaho Falls in 16h 25m. 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 37% less than the average price by searching for these airlines.

What is the cheapest day to fly from Idaho Falls to London?

Travelers seeking maximum savings on their Idaho Falls to London flight should consider departing on Thursday afternoons when fares are most often at their lowest. Friday at noon flights should be avoided if possible as fares are typically the most expensive at this time.

In terms of precipitation, rainfall in London ranges from 1.6 - 2.8 inches per month. January is typically the wettest month, when rainfall can reach 2.8 in. July is typically the driest time to visit London when rainfall is around 1.6 in.

If weather is an important factor for your trip to London, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 62.6 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 39.2 F).

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

Users have found that flying from Idaho Falls to London on a Sunday typically leans towards higher prices. However, this doesn’t mean you still can’t find a deal. Flexibility with other aspects of your flight can still land a great price for your trip.

What is the cheapest month to fly from Idaho Falls to London?

The best pricing can be found in the month of March. Prices to London from Idaho Falls average $1,100. You can even find prices in March for less than $1,100, as users have found deals to London from as low as $747. The month of December appears to be one of the more expensive times to travel to London from Idaho Falls. Flying in the targeted month can save you up to 77%.

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.

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.

$428+ Flights from Idaho Falls to London

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Cheap flight deals from Idaho Falls to London

Round-trip from	$617 (KLM)
One-way from	$428 (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. 20% potential increase in price ($274 potential increase over avg. RT price).

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Cheapest flight prices on average. 9% potential price decrease ($96 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 septembre 11, 2025.

lun. 10/61:15 pmIDA - LHR

1 stop13h 35mKLM

mer. 10/226:30 amLHR - IDA

2 stops18h 43mKLM

Deal found 9/10

$617

dim. 10/261:15 pmIDA - LHR

2 stops16h 25mDelta

dim. 11/28:55 amLHR - IDA

2 stops20h 20mDelta

Deal found 9/11

$726

dim. 10/262:45 pmIDA - LHR

1 stop12h 55mUnited Airlines

dim. 11/211:35 amLHR - IDA

1 stop16h 28mUnited Airlines

Deal found 9/11

$743

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 septembre 11, 2025.

lun. 10/61:15 pmIDA - LHR

2 stops18h 00mKLM

mer. 10/226:30 amLHR - IDA

2 stops18h 43mKLM

Deal found 9/10

$617

dim. 10/261:15 pmIDA - LHR

2 stops16h 25mMultiple Airlines

dim. 11/210:45 amLHR - IDA

1 stop14h 28mMultiple Airlines

Deal found 9/11

$726

dim. 10/261:15 pmIDA - LHR

2 stops16h 25mDelta

dim. 11/28:55 amLHR - IDA

2 stops20h 20mDelta

Deal found 9/11

$726

dim. 10/262:45 pmIDA - LHR

1 stop12h 55mUnited Airlines

dim. 11/211:35 amLHR - IDA

1 stop16h 28mUnited Airlines

Deal found 9/11

$743

Last-minute flights from Idaho Falls to London
Discover last-minute flight deals from Idaho Falls to London. Data last updated septembre 11, 2025 and is based on user searches.

lun. 10/61:15 pmIDA - LHR

2 stops18h 00mKLM

mer. 10/226:30 amLHR - IDA

2 stops18h 43mKLM

Deal found 9/10

$617

dim. 10/261:15 pmIDA - LHR

2 stops16h 25mDelta

dim. 11/28:55 amLHR - IDA

2 stops20h 20mDelta

Deal found 9/11

$726

dim. 10/262:45 pmIDA - LHR

1 stop12h 55mUnited Airlines

dim. 11/211:35 amLHR - IDA

1 stop16h 28mUnited Airlines

Deal found 9/11

$743

One-way flights from Idaho Falls to London
Search for one-way flight options from Idaho Falls to London. Find affordable one-way fares based on user searches. Data last updated septembre 11, 2025.

mer. 10/293:50 pmIDA - LHR

3 stops43h 40mMultiple Airlines

Deal found 9/11

$428

mer. 10/2912:55 pmIDA - LHR

1 stop15h 05mAmerican Airlines

Deal found 9/11

$449

mer. 10/292:45 pmIDA - LHR

2 stops14h 30mUnited Airlines

Deal found 9/11

$459

Cheapflights Fare Finder

Use the filters below to find and compare flights from Idaho Falls to London that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

lun. 10/6

1:15 pm-2:15 pm

2 stops18h 00m

London Heathrow

mer. 10/22

6:30 am-6:13 pm

2 stops18h 43m

$617

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

dim. 10/26

1:15 pm-11:40 am

2 stops16h 25m

London Heathrow

dim. 11/2

10:45 am-6:13 pm

1 stop14h 28m

$726

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

dim. 10/26

1:15 pm-11:40 am

2 stops16h 25m

London Heathrow

dim. 11/2

8:55 am-10:15 pm

2 stops20h 20m

$726

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

dim. 10/26

2:45 pm-9:40 am

1 stop12h 55m

London Heathrow

dim. 11/2

11:35 am-9:03 pm

1 stop16h 28m

$743

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

mer. 10/29

3:50 pm-5:30 pm

3 stops43h 40m

$428

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

mer. 10/29

12:55 pm-10:00 am

1 stop15h 05m

$449

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

mer. 10/29

2:45 pm-11:15 am

2 stops14h 30m

$459

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/11

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 $1,098). 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?

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

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

8,937 reviews

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

8,937 reviews

United Airlines

7.4

Good

8,937 reviews

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

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 $726, KLM can have you in London from Idaho Falls in 16h 25m. 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 37% 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 $1,098). 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

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Hayes

Thornton Heath

Southend-on-Sea

Harrow

Canterbury

Croydon

Eastleigh

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Winchester

Orpington

Gatwick

Borehamwood

Aylesbury

Bedford

Wembley

Folkestone

Chichester

Arundel

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Top 2 airlines flying from Idaho Falls to London

Airline	Cheapest	Average	Flexibility	On-time
Delta	Cheapest$691	Average$1,200	FlexibilityNo cancel fee	On-timeN/A
United Airlines	Cheapest$699	Average$927	FlexibilityNo cancel fee	On-time69%

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$428+ 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 10/29. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from Idaho Falls to London with Cheapflights

1. Tell us where you want to go

2. Select your favorite providers

3. Compare prices and book

Cheap flight deals from Idaho Falls to London

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Find flight deals from Idaho Falls to London

Cheapest flights from Idaho Falls to LondonExplore 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 septembre 11, 2025.

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 septembre 11, 2025.

Cheapflights Fare Finder

Use the filters below to find and compare flights from Idaho Falls to London that are best for you.

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.

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?

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 septembre 11, 2025.

Reviews of airlines servicing London

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.

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?

How long is the flight from Idaho Falls to London?

What are the cheapest airlines flying from Idaho Falls to London round-trip?

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

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

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

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

Traveling to a place near London?

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Alternative routes for Idaho Falls to London

See prices for flight routes from nearby airports that may be better suited for you.

Top 2 airlines flying from Idaho Falls to London

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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 septembre 11, 2025.