Despite the word 'distance' in the title of your question, I assume that what you actually want to know is the flight duration.
Easyjet quote 2 hours 25 minutes outbound and 2 hours 35 minutes return. The other 6 airlines operating scheduled flights on this route will have roughly similar times.
Chris
PS: If you really did want the distance, your answer is 883 miles (1421 km).