Most airlines, including easyJet, Flybe, Ryanair, Monarch and Aer Lingus are now ticketless (
(The only exception to this is if your confirmation states your booking is with Teleticket. where your tickets will be emailed to you 21 days before your flight)
Your email confirmation acts as your e-ticket. With most airlines you can simply turn up at the airport with your booking reference number and they will check you in and print your boarding pass for you.
Ryanair charge for this service (£50/€50 per person, per flight) all other airlines encourage you to check-in online but it is not a requirement for travel! They will collect your passport information from the check-in desk counter free of charge on the day of your flight so you do not need to access your booking again.
This said, we recommend all passengers check the relevant airport or airlines website for any disruption or amendment to flight timings.