HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
London

$744+ Cheap flights from Idaho Falls (IDA) to London (LON)

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 8/3. Fares are subject to change and may not be available on all flights or dates of travel.
IDA — LON
Jun 17 — Jun 241
Tue 6/17
Tue 6/24
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Idaho Falls to London with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

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 June 12, 2025.

Round-trip from

$744
(United Airlines)

Popular in

December

Cheapest in

November

Average price

$1,318
From Idaho Falls Fanning Field to London (LON)
Search Deals
Highest demand for flights based on searches. 8% potential increase in price ($100 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 9% potential price decrease ($92 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in June 2025
Search Deals

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 June 12, 2025.

This United Airlines deal was found by Cheapflights users on 6/12. 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 8/35:00 amIDA - LHR
2 stops18h 20mUnited Airlines
Tue 8/192:50 pmLHR - IDA
1 stop13h 04mUnited Airlines
Deal found 6/12$744
This American Airlines deal was found by Cheapflights users on 6/10. 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.
Wed 7/301:47 pmIDA - LHR
1 stop14h 03mAmerican Airlines
Sat 8/98:20 amLHR - IDA
1 stop19h 58mAmerican Airlines
Deal found 6/10$916
This Expedia deal was found by Cheapflights users on 6/11. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/256:15 amIDA - LHR
2 stops31h 05mMultiple Airlines
Wed 7/29:25 pmLHR - IDA
2 stops48h 57mMultiple Airlines
Deal found 6/11$1,683
This Netflights deal was found by Cheapflights users on 6/11. 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 Netflights is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/2511:20 amIDA - LHR
1 stop15h 30mVirgin Atlantic
Wed 7/29:20 amLHR - IDA
2 stops20h 35mVirgin Atlantic
Deal found 6/11$1,701
This Delta deal was found by Cheapflights users on 6/9. 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.
Sat 6/216:52 pmIDA - LHR
2 stops18h 08mDelta
Wed 7/96:15 amLHR - IDA
2 stops18h 56mDelta
Deal found 6/9$1,737
This KLM deal was found by Cheapflights users on 6/12. 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.
Mon 6/233:04 pmIDA - LHR
1 stop11h 46mKLM
Wed 7/211:00 amLHR - IDA
1 stop18h 55mKLM
Deal found 6/12$1,740

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 June 12, 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

Sun 8/3

10:45 am-12:20 pm

1 stop18h 35m

London Heathrow

Tue 8/19

11:25 am-5:23 pm

1 stop12h 58m

$744

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Wed 7/30

1:47 pm-10:50 am

1 stop14h 03m

London Heathrow

Sat 8/9

8:20 am-9:18 pm

1 stop19h 58m

$916

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Wed 6/25

6:15 am-8:20 pm

2 stops31h 05m

London Heathrow

Wed 7/2

9:25 pm-3:22 pm

2 stops48h 57m

$1,683

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Wed 6/25

11:20 am-9:50 am

1 stop15h 30m

London Heathrow

Wed 7/2

9:20 am-10:55 pm

2 stops20h 35m

$1,701

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Mon 6/23

3:04 pm-9:50 am

1 stop11h 46m

London Heathrow

Wed 7/2

11:00 am-10:55 pm

1 stop18h 55m

$1,740

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/12

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 $1,108). 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 June 12, 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.

Rainfall in London by month

Plan your trip to London by taking into account the average rainfall totals by month.

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.

Temperature in London by month

Plan your trip to London by taking into account the average temperature totals by month.

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).

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 June 12, 2025.
See what other customers who have flown with KLM, United Airlines and Virgin Atlantic from Idaho Falls to London have to say. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
KLM
7.8
Good
1,358 reviews

Food

7.2

Boarding

7.8

Crew

8.4

Entertainment

7.1

Comfort

7.7

Overall

7.8

Reviews

1 / 20
8.0
Excellent

Allan,Jun 2025

YYZ - AMS

I always enjoy flying KLM. Service is attentive, friendly and professional. The seat, when fully reclined is a little hard; some kind of mattress or topper would be helpful here. The dinner was really not very good …. “Meatless meatballs” tasted quite peculiar. Breakfast which consisted of an egg white omelette in flour tortilla was also rather tasteless.
KLM
7.8
Good
1,358 reviews
KLM
7.8
Good
1,358 reviews

Food

7.2

Boarding

7.8

Crew

8.4

Entertainment

7.1

Comfort

7.7

Overall

7.8

Reviews

1 / 20
8.0
Excellent

Allan,Jun 2025

YYZ - AMS

I always enjoy flying KLM. Service is attentive, friendly and professional. The seat, when fully reclined is a little hard; some kind of mattress or topper would be helpful here. The dinner was really not very good …. “Meatless meatballs” tasted quite peculiar. Breakfast which consisted of an egg white omelette in flour tortilla was also rather tasteless.
United Airlines
7.4
Good
8,790 reviews
KLM
7.8
Good
1,358 reviews

Food

7.2

Boarding

7.8

Crew

8.4

Entertainment

7.1

Comfort

7.7

Overall

7.8

Reviews

1 / 20
8.0
Excellent

Allan,Jun 2025

YYZ - AMS

I always enjoy flying KLM. Service is attentive, friendly and professional. The seat, when fully reclined is a little hard; some kind of mattress or topper would be helpful here. The dinner was really not very good …. “Meatless meatballs” tasted quite peculiar. Breakfast which consisted of an egg white omelette in flour tortilla was also rather tasteless.
Virgin Atlantic
7.4
Good
652 reviews
KLM
7.8
Good
1,358 reviews

Food

7.2

Boarding

7.8

Crew

8.4

Entertainment

7.1

Comfort

7.7

Overall

7.8

Reviews

1 / 20
8.0
Excellent

Allan,Jun 2025

YYZ - AMS

I always enjoy flying KLM. Service is attentive, friendly and professional. The seat, when fully reclined is a little hard; some kind of mattress or topper would be helpful here. The dinner was really not very good …. “Meatless meatballs” tasted quite peculiar. Breakfast which consisted of an egg white omelette in flour tortilla was also rather tasteless.
American Airlines
7.2
Good
10,000 reviews
KLM
7.8
Good
1,358 reviews

Food

7.2

Boarding

7.8

Crew

8.4

Entertainment

7.1

Comfort

7.7

Overall

7.8

Reviews

1 / 20
8.0
Excellent

Allan,Jun 2025

YYZ - AMS

I always enjoy flying KLM. Service is attentive, friendly and professional. The seat, when fully reclined is a little hard; some kind of mattress or topper would be helpful here. The dinner was really not very good …. “Meatless meatballs” tasted quite peculiar. Breakfast which consisted of an egg white omelette in flour tortilla was also rather tasteless.

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.

  • 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 $744. Other airlines that can offer you cheap pricing are American Airlines, from $916, and Virgin Atlantic, from $1,701. You may be able to fly from Idaho Falls to London for 28% 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 $1,108). 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 Idaho Falls?

Book flights to Idaho Falls if you plan to visit one of these locations
Hayes
Hounslow
Thornton Heath
Luton
Canterbury
Harrow
Dover
Gatwick
Orpington
Watford
Croydon
Folkestone
Borehamwood
Sutton
Aylesbury
Chelmsford
Brentwood
Chichester
Wembley
Arundel

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

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 June 12, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$699Average$1,013FlexibilityNo cancel feeOn-time69%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.