From Davis Amtrak train to Richmond, BART to Millbrae Caltrain, then Caltrain to Redwood City Caltrain. 3 h 14 min $51. From Davis drive to Redwood City. 1 h 43 min $11. From UC Davis Memorial Union bus to Sacramento airport, fly to San Francisco airport, then line 398 bus to Redwood City. 3 h 59 min $100.