Delta Air Lines flies to Dakar on most of their US-Africa services, service from Atlanta and JFK airport takes roughly 8 hours.South African Airways flies direct from New York and Washington-Dulles in just about 7 hours 8.5 on the return trip. Other airlines route through Europe such as Brussels Airlines Brussels, Air Senegal International Paris-Orly, Air France Paris-CDG, Alitalia Milan, Royal Air Maroc Casablanca, Iberia Madrid, Gran Canaria, TAP Lisbon and others 5.5 to 6 hours. There are flights from various parts of Africa operated by Virgin Nigeria Lagos, Kenya Airways Nairobi, Air Ivoire Abidjan and others.
It is possible but a little bit difficult to get into Senegal by car. Senegal prohibits the import of cars that are more than five years old, but if you are only staying for a short while, and agree to take your car out of the country, you should eventually be allowed through, but this cannot be guaranteed.
According to the customs of Senegel is it since 2008 again allowed to import cars also older than five years.