Trying to book IAD-OAK, SFO-IAD in December. Interestingly, the price is not halfway in between the lower priced RT through OAK and the higher priced RT through SFO, it's closer to the OAK price.

Plenty of E+ available outbound, but no E+ available inbound? On a weekday in December? Two diffferent flights? I checked one of the SFO return flights as a one-way and found plenty of E+ availability.

Does this have something to do with booking an openjaw flight? Is it just a UAL.bomb glitch?