There are a variety of airlines that fly to Dublin from all London airports – direct flights from London are available on Aer Lingus, Ryan Air and more. If you are just looking for the cheapest flight try RyanAir, though the flight times tend to be undesirable and they leave from the smaller airports.
If you are able to shop in advance, Aer Lingus does offer flights from £4.99 between London Heathrow and Dublin.
Flights to Dublin sample pricing and schedules
|Airline||Aer Lingus 155|
|Travel time||nonstop 1h, 15m 279 mi|
|Depart||London (LHR), 10:00am GMT, terminal 1|
|Arrive||Dublin (DUB), 11:15am GMT, terminal 2|
|Airline||Aer Lingus 172|
|Travel time||nonstop 1h, 20m 279 mi|
|Depart||Dublin (DUB), 3:30pm GMT, terminal 2|
|Arrive||London (LHR), 4:50pm GMT, terminal 1|
£278.39 vacation package for this flight + 2 nights stay at Maldron Hotel Parnell Square