IDA - LHR

$855 Find Cheap Flights from Idaho Falls to London

This is the cheapest round-trip flight price found by a KAYAK user in the last 72 hours by searching for a flight from Idaho Falls to London departing on 9/6. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy, 0 bags

KAYAK searches hundreds of travel sites at once for deals on flights to London Heathrow Airport

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Idaho Falls to London, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Idaho Falls to London, as well as popular online travel agencies
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41 299 237 searches in the past 7 days on KAYAK

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Everything you should know

Cheapest round-trip
$855
American Airlines
Sun 9/6Sat 9/12
IDA - LHR • 1 stop
Top airlines
American Airlines
Cheapest • from $855 (round-trip)
United Airlines
Best reviews • 7.4 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
Nonstop flights
Not available
There are currently no direct flights between Idaho Falls and London. You'll need at least 1 connection.
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We hope you love your trip to London!
Flight Deals
Booking Insights
Flight Deals

Cheap Flights from Idaho Falls to London (IDA-LHR)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Idaho Falls to London that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Idaho Falls to London

Sun, Sep 6 - Sat, Sep 12
American Airlines Logo
12:46 pm - 11:15 am
IDA
-
LHR
15h 29m
1 stop
American Airlines Logo
8:55 am - 9:22 pm
LHR
-
IDA
19h 27m
1 stop
$855American Airlines
Sun, Sep 6 - Sat, Sep 12
American Airlines Logo
12:46 pm - 11:15 am
IDA
-
LHR
15h 29m
1 stop
American Airlines Logo
10:05 am - 9:22 pm
LHR
-
IDA
18h 17m
2 stops
$859American Airlines
Tue, Apr 14 - Tue, Apr 21
American Airlines Logo
7:48 am - 3:05 pm
IDA
-
LHR
24h 17m
1 stop
American Airlines Logo
4:10 pm - 11:39 pm
LHR
-
IDA
14h 29m
1 stop
$865American Airlines
Tue, Apr 14 - Tue, Apr 21
American Airlines Logo
1:43 pm - 12:10 pm
IDA
-
LHR
15h 27m
1 stop
American Airlines Logo
9:45 am - 11:39 pm
LHR
-
IDA
20h 54m
2 stops
$869American Airlines
Wed, Sep 2 - Wed, Sep 9
American Airlines Logo
2:20 pm - 2:25 pm
IDA
-
LHR
17h 05m
1 stop
American Airlines Logo
8:55 am - 9:22 pm
LHR
-
IDA
19h 27m
1 stop
$883American Airlines
Tue, Sep 1 - Sat, Sep 12
American Airlines Logo
12:46 pm - 9:05 am
IDA
-
LHR
13h 19m
1 stop
American Airlines Logo
8:55 am - 9:22 pm
LHR
-
IDA
19h 27m
1 stop
$885American Airlines
Wed, Sep 2 - Wed, Sep 9
American Airlines Logo
2:20 pm - 2:25 pm
IDA
-
LHR
17h 05m
1 stop
American Airlines Logo
9:15 am - 9:22 pm
LHR
-
IDA
19h 07m
2 stops
$888American Airlines
Tue, Sep 1 - Sat, Sep 12
American Airlines Logo
12:46 pm - 9:05 am
IDA
-
LHR
13h 19m
1 stop
American Airlines Logo
10:05 am - 9:22 pm
LHR
-
IDA
18h 17m
2 stops
$889American Airlines
Tue, Apr 7 - Tue, Apr 14
Multiple Airlines Logo
7:48 am - 3:05 pm
IDA
-
LHR
24h 17m
1 stop
Multiple Airlines Logo
4:10 pm - 11:39 pm
LHR
-
IDA
14h 29m
1 stop
$955Multiple Airlines
Tue, Apr 7 - Tue, Apr 14
American Airlines Logo
1:43 pm - 12:10 pm
IDA
-
LHR
15h 27m
1 stop
American Airlines Logo
11:10 am - 11:39 pm
LHR
-
IDA
19h 29m
2 stops
$959American Airlines
Booking Insights

KAYAK's insights & trends for Idaho Falls to London flights

Get data-powered insights and trends into flights from Idaho Falls to London to help you find the cheapest flights, the best time to fly and much more.

Which airlines provide the cheapest flights from Idaho Falls to London?

The cheapest round-trip price for the route for each airline clicked by KAYAK users in the last 72 hours.

In the past 3 days, the cheapest round-trip tickets from Idaho Falls to London were found on American Airlines ($855) and Icelandair ($1,043).

Find deals

Good to know

Cheapest flight$855
Flight from Idaho Falls to London

When to book flights from Idaho Falls to London

Are your dates flexible? Find out the best times to travel from Idaho Falls to London based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs for booking Idaho Falls to London flights

  • What is the cheapest flight from Idaho Falls to London Heathrow Airport?

    In the last 3 days, the lowest price for a flight from Idaho Falls to London Heathrow Airport was $855 for a round-trip ticket.

  • Do I need a passport to fly between Idaho Falls and London?

    Yes

  • Which airports will I be using when flying from Idaho Falls to London?

    When flying out of Idaho Falls you will be using Idaho Falls Fanning Field. You will be landing at London, also known as London Heathrow.

  • Which aircraft models fly most regularly from Idaho Falls to London?

    We unfortunately don’t have that data for this specific route.

  • Which airline alliances offer flights from Idaho Falls to London?

    Star Alliance is the only airline alliance operating flights between Idaho Falls and London.

  • How does KAYAK find such low prices on flights from Idaho Falls to London?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Idaho Falls to London.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Idaho Falls to London?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to London from Idaho Falls is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Idaho Falls to London?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to London with an airline and back to Idaho Falls with another airline. Booking your flights between Idaho Falls and LHR can sometimes prove cheaper using this method.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Idaho Falls to London?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to London from Idaho Falls up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Reviews of the top airline flying from Idaho Falls to London

 
See real verified KAYAK customer reviews for airlines flying from Idaho Falls to London. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from Idaho Falls to London? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
7.4
United AirlinesOverall score based on 9450 reviews
7.7Boarding
8.1Crew
6.6Food
7.1Entertainment
7.3Comfort
Airline reviews

Good quick flight on a small but comfortable plane. I'm 6'3 and had plenty of space.

8.0 ExcellentMatthew, Mar 2026
IAD - CMH
Read more United Airlines reviews

Good quick flight on a small but comfortable plane. I'm 6'3 and had plenty of space.

Experience was great - no complaints. Took off on time, landed early. Got to the gate relatively quickly - took a little bit of extra time to deplane but nothing excessive.

Business class seats felt very cramped compared to other airlines.

Economy plus was so cramped I could not use my laptop. It was beyond bad.

OK, we were delayed and had to de plane and reboard.

United is one airline which regardless of how many separate United tickets in existence, if one flight breaks down, the airline will take care of all the flights.

Both our flights were delayed. Almost didn’t get in the second flight. Staff was rude to the bone.

Both my flight where delayed Had 25min to make it to my transfer flight

Everything was on time and service on the flight was great!

Wifi Bluetooth features for watching in flight movie was horrible. Screen kept blacking out no connection of sound although it said connected. Other than that smooth trip .

Everything you need to know for your flight from Idaho Falls to London

Information on your arrival and departure airports

Idaho Falls (IDA)
Heathrow (LHR)