SFO-MEM-AMS leaves at 1:30PM from SFO and arrives into AMS at 12:15PM+1 while the SFO-AMS leaves at 4 PM and arrives at 11:30AM+1. With those times, they are close and the extra miles would be worth a 3 hour earlier flight and a later 45 minute arrival. Then the return u could do the AMS-SFO and at least get the bonus one way giving u a nice amount of miles for 2 tickets or close to 2 free domestic tickets.