Most people will come to Oxford via London. London Heathrow is the largest airport in London, followed by Gatwick airport. Both Heathrow and Gatwick have a coach (aka bus) service that travels straight to Oxford. This main coach service is (somewhat confusingly) called the Airline. Bookings can be one-way, or return trip with an open interval of several weeks. Bookings must generally be made at least 24 hours in advance in order to guarantee a spot, but many people choose to pay at the time of boarding. The website instructions will explain where to board the coach depending on the airport and terminal in which you arrive. The coach has air-conditioning, wireless internet, and UK-style power outlets.

To arrive in Oxford, you will generally exit at High St/Queens Lane stop, unless you have made accommodations elsewhere outside the city center of Oxford.

One can easily travel around the clock between London and Oxford via bus, allowing one to spend hours, days, or weeks in either city. There are two main coach services that go directly between Oxford and London: one is the Oxford Tube and the other is the X90. They are comparable in service and price, but the Tube tends to be more popular among students (and also has a double decker bus). Alternatively, one could also take the rail system (for example, from Oxford station to Paddington station), though this tends to be more expensive and less flexible.