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$343+ Cheap flights from Idaho Falls (IDA) to the United Kingdom

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 2/5. Fares are subject to change and may not be available on all flights or dates of travel.
IDA — LHR
Jan 17 — Jan 241
Sat 1/17
Sat 1/24
1 adult, Economy
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Cheap flight deals from Idaho Falls to United Kingdom

Cheapest flights from Idaho Falls to United Kingdom
Explore the most affordable flight options available from Idaho Falls to United Kingdom. Find the lowest fares from popular airlines and budget airlines, with prices last updated on December 18, 2025.

This Ovago deal was found by Cheapflights users on 12/17. 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 Ovago is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/217:00 amIDA - LHR
1 stop23h 15mBritish Airways
Tue 12/232:20 pmLHR - IDA
1 stop15h 01mBritish Airways
Deal found 12/17$2,936
This American Airlines deal was found by Cheapflights users on 12/17. 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.
Sun 12/211:16 pmIDA - LHR
1 stop13h 44mAmerican Airlines
Tue 12/232:20 pmLHR - IDA
1 stop15h 01mAmerican Airlines
Deal found 12/17$2,944
This United Airlines deal was found by Cheapflights users on 12/17. 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.
Sun 12/215:00 amIDA - LHR
2 stops30h 35mUnited Airlines
Tue 12/231:00 pmLHR - IDA
3 stops39h 14mUnited Airlines
Deal found 12/17$3,666
This Scandinavian Airlines deal was found by Cheapflights users on 12/17. 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 Scandinavian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/211:10 pmIDA - LHR
3 stops21h 30mMultiple Airlines
Tue 12/2310:20 amLHR - IDA
3 stops33h 07mMultiple Airlines
Deal found 12/17$4,828

Find flight deals from Idaho Falls to United Kingdom

Keep the following information in mind while searching for Idaho Falls to United Kingdom flight deals. Data was last updated December 18, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$620
(United Airlines)

One-way from

$343
(Kiwi.com)

Popular in

June

Cheapest in

March

Average price

$1,050
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 United Kingdom
Search Deals
One-way flight from Idaho Falls Fanning Field to United Kingdom
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).
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Average for round-trip flights in December 2025
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Cheapflights Fare Finder

 
Customize your flight search to find flights from Idaho Falls to United Kingdom 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 18, 2025.
Use the filters below to find and compare flights from Idaho Falls to the United Kingdom that are best for you.

Fly from

Idaho Falls

Fly to

United Kingdom

Route

Depart

Return

Price

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Thu 1/15

4:19 pm-7:30 am

2 stops32h 11m

London Heathrow

Wed 1/28

6:35 am-9:56 am

2 stops34h 21m

$620

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Fri 1/30

1:15 pm-11:40 am

2 stops15h 25m

London Heathrow

Fri 2/6

6:20 am-5:51 pm

2 stops18h 31m

$627

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Sat 1/31

2:40 pm-9:40 am

1 stop12h 00m

London Heathrow

Sat 2/7

6:35 am-9:56 am

2 stops34h 21m

$628

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Thu 1/15

10:51 am-9:40 am

1 stop15h 49m

London Heathrow

Thu 1/22

6:35 am-9:14 pm

2 stops21h 39m

$628

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Thu 1/15

2:40 pm-9:40 am

1 stop12h 00m

London Heathrow

Mon 1/19

4:40 pm-1:30 pm

2 stops51h 50m

$639

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Fri 2/6

9:20 pm-12:50 pm

2 stops56h 30m

$360

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Thu 2/5

10:51 am-10:25 am

2 stops16h 34m

$399

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Thu 2/5

1:34 pm-12:50 pm

2 stops40h 16m

$399

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Fri 2/6

2:40 pm-9:40 am

1 stop12h 00m

$399

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Fri 2/6

7:20 am-1:15 pm

1 stop22h 55m

$419

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/17

Showing 1-10 of 12 results
1
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Best time to book a flight from Idaho Falls to United Kingdom

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

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

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

Find hourly flight availability from Idaho Falls to United Kingdom. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated December 18, 2025.

Unlike in the evening, when flights are generally more expensive, you can save up to 15% on flights from Idaho Falls to United Kingdom by exploring options for tickets in the morning.

Reviews of airlines servicing United Kingdom

Get insights into the airlines that provide service to United Kingdom. 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 United Kingdom. Reviews last updated December 18, 2025.
Get a feel of what it's like to fly with United Airlines from Idaho Falls to the United Kingdom 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
9,091 reviews

Comfort

7.3

Boarding

7.7

Food

6.6

Overall

7.4

Entertainment

7.1

Crew

8.1

Reviews

1 / 20
4.0
Okay

Kevin,Dec 2025

BOS - EWR

Seems like every United flight has a delay and it’s always someone else’s fault. Step up and take some accountability
United Airlines
7.4
Good
9,091 reviews
United Airlines
7.4
Good
9,091 reviews

Comfort

7.3

Boarding

7.7

Food

6.6

Overall

7.4

Entertainment

7.1

Crew

8.1

Reviews

1 / 20
4.0
Okay

Kevin,Dec 2025

BOS - EWR

Seems like every United flight has a delay and it’s always someone else’s fault. Step up and take some accountability

Related info for your journey

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

    Located just 3.8 mi from the city center, Idaho Falls Fanning Field (IDA) is the airport most travelers will use when flying to United Kingdom from Idaho Falls.

  • How long is the flight from Idaho Falls to United Kingdom?

    There are many flights that can get you from Idaho Falls to United Kingdom in 32h 11m. Fly via United Airlines to get the fastest option. There are 4705 mi between Idaho Falls and United Kingdom.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Idaho Falls to United Kingdom 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 United Kingdom?

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

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Top airline flying from Idaho Falls to United Kingdom

Discover the top airline that operate flights from Idaho Falls to United Kingdom. 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 18, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$699Average$1,037FlexibilityNo cancel feeOn-time69%

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