You may either consider to book return flights from Dublin or open jaw tickets when returning back to UK (London, Edinburgh, Manchester). Promotional deal with American Airlines is valid for flights in travel period till 31st of October 2015 (latest date of your outbound flight to Bermuda) and this includes summer holidays. Max stay 30 days, booking to be done till 3rd of March 2015. If you want to compare affordable accommodation in Bermuda please check here.
Booking samples
American Airlines/British Airways
EN - Dublin - Bermuda from €532 or £392
DE - Dublin - Bermuda from €531
Dublin - Bermuda - UK for £439
Air Canada/Aer Lingus (look for flights between September and Nocember 2015)
EN - Dublin - Bermuda from €502 or £370
DE - Dublin - Bermuda from €500
Travel dates granting the lowest fare are available in classic tourist season and you may expect tropical climate as best time to visit famous Bermuda is considered within April and September. Still, you should be able to find plenty of activities to enjoy your stay at this fabulous island. As the Dublin is HQ of Ryanair this is also a good option for travellers from other European countries looking for some luxurous holidays for relatively low price. Check our your connection possibilities via Skyscanner or directly with Ryanair.
Booking sample of cheap roundtrip flights to Bermuda from Irelnad for €500 here. In this case you would be flying from Dublin to Hamilton on 4th of September and returning from Bermuda back to Dublin on 13th of September 2015.