| Oakland Airport | Island Dr. & Mecartney Rd. | Harbor Bay Ferry Terminal | Park St. & Otis Dr. | Santa Clara Ave. and Park St. | Fruitvale BART | Fruitvale Ave. & MacArthur Blvd. | |||
| 21 | 625a | 633a | - | 645a | 648a | 658a | 709a | ||
| 21 | 653a | 701a | - | 715a | 718a | 730a | 743a | ||
| 21 | 723a | 731a | - | 745a | 748a | 800a | 813a | ||
| 21 | 753a | 801a | - | 815a | 818a | 830a | 843a | ||
| 21 | 824a | 832a | - | 845a | 848a | 900a | 913a | ||
| 21 | 854a | 902a | - | 915a | 918a | 930a | 943a | ||
| 21 | 925a | 933a | - | 945a | 949a | 1001a | 1015a | ||
| 21 | 955a | 1003a | - | 1015a | 1019a | 1031a | 1045a | ||
| 21 | 1025a | 1033a | - | 1045a | 1049a | 1101a | 1115a | ||
| 21 | 1055a | 1103a | - | 1115a | 1119a | 1131a | 1145a | ||
| 21 | 1125a | 1133a | - | 1145a | 1149a | 1201p | 1215p | ||
| 21 | 1154a | 1202p | - | 1214p | 1218p | 1230p | 1245p | ||
| 21 | 1225p | 1233p | - | 1245p | 1249p | 101p | 116p | ||
| 21 | 1255p | 103p | - | 115p | 119p | 131p | 146p | ||
| 21 | 123p | 131p | - | 144p | 148p | 200p | 215p | ||
| 21 | 154p | 202p | - | 215p | 219p | 231p | 246p | ||
| 21 | 224p | 232p | - | 245p | 249p | 301p | 316p | ||
| 21 | 253p | 301p | - | 314p | 318p | 330p | 345p | ||
| 21 | 324p | 332p | - | 345p | 349p | 401p | 416p | ||
| 21 | 354p | 402p | - | 415p | 419p | 431p | 446p | ||
| 21 | 424p | 432p | - | 445p | 449p | 501p | 516p | ||
| 21 | 453p | 501p | 505p | 516p | 520p | 532p | 547p | ||
| 21 | 525p | 533p | - | 546p | 550p | 602p | 617p | ||
| 21 | 552p | 600p | 604p | 615p | 619p | 631p | 646p | ||
| 21 | 624p | 631p | 635p | 646p | 650p | 701p | 715p | ||
| 21 | 654p | 701p | 705p | 716p | 720p | 731p | 745p | ||
| 21 | 728p | 735p | - | 746p | 750p | 800p | 813p | ||
| 21 | 754p | 801p | 805p | 816p | 820p | 830p | 843p | ||
| 21 | 826p | 833p | - | 843p | 846p | 855p | 907p | ||
| 21 | 856p | 903p | - | 913p | 916p | 925p | 937p | ||
| 21 | 926p | 933p | - | 943p | 946p | 955p | 1007p | ||