Flights to Tobago
Unfortunately, there are no direct scheduled flights available to Tobago at the time of writing. While you may be able to find charter flights that will take you there directly, travelling using the regular carriers will involve a couple of stop offs.
Tobago Flights
Getting to Tobago can take up to 10hours, depending on the connections you choose. However, the trip need not be a chore - it's worth investigating taking advantage of the stop offs to experience a new place for a few days before moving on to your final destination. Expect to pay up to £700 for scheduled flights, but be aware that offers can bring the price down considerably, especially for very early and very late bookings.