Ryanair offers travel options in April-May for 15€ one way. For example: to Athens on April 23, May 5; to Bordeaux, Vienna or Bratislava on April 16

Ryanair offers travel options in April and May for 15€ one way. For example:

to Athens on April 23, May 5;
to Bordeaux, Vienna or Bratislava on April 16;
to Crete (Chania) on April 15, 16, 17, 18, 19, 22, 23, 24;
to Katowice on April 18;
to Malta on April 17;
to Milan on May 17;
to Newcastle on April 23;
to Sofia on April 16, 17, 18;
to Venice on April 16 or 23;
to Warsaw on April 19.

Tickets here.

Source