The ExploreBeijing subway map now supports route planning. Simply drag your mouse between two stations to see an estimate for the time needed for the journey (including changes, and time spent waiting for trains).
Note that unlike on the Shanghai metro, all journeys cost a flat 2RMB. The new Airport Express line costs 25RMB! As with other features on explorebj.com, there may be some inaccuracies during the “beta” period, do get in touch if anything looks wrong!
The exact timings for the new lines (Line 8, Line 10 and the Airport Express) won’t be confirmed until later this month when the lines open.