Travel times to some of the hotels can be as much as 90 minutes each way, although average time is probably closer to 45 minutes. The best way to get low-cost air tickets is usually to buy them in sales which occur during the winter months. When setting travel dates, note that community and other satellite meetings usually occur before the international AIDS conference, not after. May 1 is the deadline for the standard registration fee, and for child care requests. June 1 is the deadline for late-breaker abstracts.
Early registration is advised.
There might or might not be onsite registration, depending on space available. Another option is a group fare, which a travel agent may be able to arrange if you have enough people flying from the same city. No vaccinations are required, and there are no HIV-specific restrictions. Geneva is in the French-speaking part of Switzerland. English is widely understood.