Originally Posted by
wmc_06
I already tried it. Tells me I can't book two flights on the same day due to "insufficient connection time"
I just tried it and had no problem. The exact flights you want came up.
09/27 BOS-IAD
09/27 IAD-DUB
It sounds like you tried
09/27 BOS-LHR
09/27 LHR-DUB
which of course wouldn't work since you would need to fly LHR-DUB on the 28th.