Metrolink Trains operates a train from Riverside to Pasadena every 4 hours. Tickets cost $10 - $14 and the journey takes 1 h 25 min. Metro Los Angeles also services this route every 30 minutes. Alternatively, Authority operates a bus from Riverside to Pasadena every 15 minutes, and the journey takes 15 min. 2 other operators also service this route.
From Riverside-Downtown station train to Union Station - Metro Gold Line then tram to Memorial Park Station. 2 h 7 min $13. From Magnolia + Sunnyside line 15 bus to Market + University, bus to Montclair Transit Center, then bus to Colorado Blvd and Los Robles Ave W. 4 h 30 min $4. From Riverside drive to Pasadena. 55 min $6.