Note that some of these routes include a layover, but at these prices, you really shouldn't be complaining. Also, as always, prices are subject to change, meaning: make haste!
May the luck of the Irish stay with you long enough for you to grab this deal.
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Kara King is a News Writer at Thrillist and went on a bus tour of Ireland that changed her life. Send news tips to email@example.com and follow her at @karatillie.