Originally Posted by sculler1x
I fly BOS-LHR or BOS-CDG at least once per month now, and I've found the fares to be a little cheaper to LHR. CDG always seems to be a bit more expensive. You might also try taking one of AA's cheap flights to Dublin or Shannon and catching an Aer Lingus connection from there - that might be a pretty inexpensive way. If you're really saving pennies, you could fly Ryanair from Ireland as well.
Definetly,
Flying to DUB or SNN will be the cheapest (in general) and the fact that you can connect to a Ryanair flight right at the airport makes things much simpler.