How much is a ticket from London to Madrid?

The cheapest price found today is $24.

When is it cheaper to fly?

Cheapest month is October — from $24.

Cheapest today — $24. Below is what booking services offer.

Departure	Airline	Stops	Price
Oct 4	Wizz Air UK	direct	$24	View
Oct 14	Wizz Air UK	direct	$25	View
Sep 30	easyJet	direct	$27	View
Nov 3	Wizz Air UK	direct	$27	View
Sep 29	easyJet	direct	$27	View
Sep 8	Wizz Air UK	direct	$27	View
Oct 15	Wizz Air UK	direct	$28	View
Sep 21	easyJet	direct	$28	View

How much is a ticket from London to Madrid?: The cheapest price found today is $24.
When is it cheaper to fly?: Cheapest month is October — from $24.

Links to booking services are affiliate links. The price stays the same for you.