Originally Posted by bottoms up

for the bart from Oak to SFO is a piece of cake
1) hop on the transfer from OAK to coliseum station. Its free about 5 min ride.
2) buy a card at coliseum station to SFO You can use debit/credit to buy ticket. It is about 10 dollars one way.
3) hop on any train heading toward DALY CITY (Green or Blue Line)
4) Transfer to the "T" line "yellow" at any station once across the bay. Balboa park is the last station to transfer.
5)Give it about an hour for full ride.

If during morning it will be full until Powell station. Then it thins out.