For a self-guided tour of the Oxford colleges, take the Oxford tour bus. Buy a bus ticket at the City Sightseeing Sales Office at the Railway Station (Stop 1).
Then hop on, hop off. Get off at one of the 15 (out of 20) numbered stops that have one or more colleges to look at.
Some colleges may be closed, or require an admission charge. Warning: The college with the highest charges and most complicated booking system is Christ Church. Here is a list of the hours, restrictions, charges and concessions for each college: https://www.ox.ac.uk/visitors/visiting-oxford/visiting-the-colleges
Oxford alumni may obtain free admission or concession rates with their alumni card. https://www.alumni.ox.ac.uk/oxford-alumni-card
Passes for a walking tour may be obtained at Stops 8 and 13.
SOUTHERN LOOP
Stops 1-10
3. Worcester College (famed gardens).
4. Nuffield College and St Peter’s College.
6. Alice in Wonderland Shop and punting on the Isis (Thames).
7. Christ Church (Harry Potter movies filmed here), Pembroke College.
8. Brasenose College, Oriel College, Lincoln College.
9. The Queen’s College, University College, Merton College, Corpus Christi College, All Souls College.
10. Magdalen College, St Hilda’s College.
NORTHERN LOOP
11. Linacre College, St Catherine’s College.
13. New College, Exeter College.
14. Trinity College, Wadham College.
15. Keble College.
16. St Hugh’s College, Lady Margaret Hall.
17. St Antony’s College.
18. St Anne’s College, Somerville College, Eagle and Child (“Bird and Baby").
19. Balliol College, St John’s College.
