What a deal United is offering right now to San Juan, Puerto Rico! If you live near Los Angeles (LAX), Dallas (DFW) or Saint Louis (STL) you can fly ROUNDTRIP for only $229! There’s not a lot of inventory but I found days November-February. Early December had the most (see screenshot below). You can use ITA Software to find out which dates are valid and then book through our search engine (ITA doesn’t allow you to book through them) or United.com.
P.S. Not sure how long this unadvertised sale is going to last but it probably won’t be for much longer.
P.P.S. Thanks to FlyerTalk or tipping us off.