Picking the first resumed 787 flight and a return, to make a weekend of it, for example
Current seat map of the first resumed 787 flight (booked seats in gray)
Total price for the sample roundtrip itinerary we searched on United.com
As it stands right now, United is banking on resuming 787 use on their Denver to Tokyo-Narita and Houston to London-LHR routes on June 10, 2013. It won't be until August 1, 2013 that United begins their 787 service on three routes: Houston to Lagos, Nigeria; Los Angeles to Shanghai-Pudong; and Los Angeles to Tokyo-Narita. If you've booked on any of these routes for the summer or fall, check your flight itinerary on United to discover whether or not you'll be walking onto a Dreamliner, and it wouldn't hurt to cross-references flight numbers with the latest on AirlineRoute.net if you're serious about scoring a 787.
To be totally fair, seats have consistently been on sale for United 787 flights, but as the battery fix was still in progress, dates were consistently pushed back. This is the first schedule update after a battery fix trial flight, where flight dates may actually hold if all progresses smoothly from here.
Of course all of this could change at any moment, as we found out the hard way ourselves several months ago, attempting to fly a regularly scheduled United 787 from Newark to Houston, only to find it swapped out for a 777 at the last minute. You've been warned.
Note: United may not be the first airline to resume 787 service as Qatar Airways has their fingers crossed for an approved battery fix and a resumed 787 schedule as soon as May 15.