Looks like Aer Lingus is having a sale for travel up until 6/15. I checked BOS-DUB leaving on 6/3 and returning 6/14 and the fare is $642. Nothing spectacular, but better than what I’ve been seeing so far.

[Note from Don: Chris, your link had a session ID which had expired, so it didn’t work. Where do you click on AerLingus.com to find this special?]