How much is a ticket from London to Barcelona?

The cheapest price found today is $22.

When is it cheaper to fly?

Cheapest month is October — from $22.

Cheapest today — $22. Below is what booking services offer.

Departure	Airline	Stops	Price
Oct 6	Ryanair	direct	$22	View
Oct 14	Ryanair	direct	$22	View
Oct 30	Ryanair	direct	$22	View
Oct 7	Ryanair	direct	$22	View
Sep 22	easyJet	direct	$23	View
Sep 16	Ryanair	direct	$23	View
Sep 23	Ryanair	direct	$23	View
Sep 29	easyJet	direct	$23	View
Oct 10	easyJet	direct	$23	View
Oct 20	easyJet	direct	$23	View

How much is a ticket from London to Barcelona?: The cheapest price found today is $22.
When is it cheaper to fly?: Cheapest month is October — from $22.

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