List of travel providers

Legal travel to Cuba from the US 

ABC Charters
American Tours International

C & T Charters

Center for Cuban Studies
Center for the Study of Cuban Culture & Economy

Common Ground Education and Travel Services

Cuba Tours and Travel
Cuba Travel Services
Distant Horizons

Friendly Planet Travel

Global Exchange

Holbrook Travel

Insight Cuba
Island Travel Tours

Marazul

Witness for Peace
Xael Charters

[not licensed by OFAC but authorized for use]

Canadian tour operators

Authentic Cuba Travel

Cuba Education Tours

Gap Adventures 

people to people home stays in casas particulares

Grand Cayman 

Cayman Airways

on line bookings to Cuba

Travel Pros

Internet

Cuba-Travel.us

Cuban Ground Program Providers

Amistur

Havanatur

San Cristobal