On your dates no W class availability on neither the MUC or the FRA fights
Outbound Dec 17
LH 458 MUC - SFO F6 A5 C9 D9 Z9 Y9 B9 M9 H9 Q9 V9 W0 S0
LH 454 FRA - SFO F9 A7 C9 D9 Z9 Y9 B9 M9 H9 Q9 V1 W0 S0
Return Jan 06
LH 459 SFO-MUC F9 A7 C9 D9 Z9 Y9 B9 M9 H9 Q0 V0 W0 S0
LH 455 SFO-FRA F9 A9 C9 D9 Z9 Y9 B9 M9 H0 Q0 V0 W0 S0
This "Christmans Vacation Flights" are alwasy heavily booked in Y. But stil plenty of space in V and F.... (That is why my home trip over Christams will be in F
).
Looks like the best you can hope for is a V/H combination, which at least gives you full miles, but will be quite a bit more expensive... Expect to pay about $1000 plus tax instead of $550 plus tax for the w fare
Cheers, S