Tk dub-iah $1931
 

I found it on Google Flights but it works on the tk website fine. If you try the calendar, it never shows, the lowest price it shows is $2172 so you need to enter the dates manually to see. I see it available on many dates. http://i.imgur.com/GbQf8x1.png

Works with SFO too

Not a particularly great fare for DUB.

I can see $1831 on AF/KLM/Delta for next month, for example. And SFO can be had for a cheaper $1779 next month on AF/KL/DL [similar fares are available for many North American destinations: YVR - $1844, LAS - $1784, SEA - $1831, LAX - $1831, SAN - $1841 etc]. And even these doesn't strike me as a tempting offer from DUB...there are often better sales to the US from DUB, though rarely so close to departure.