Flight
For the transatlantic flight : We would recommend you fly into Paris (CDG), London (LHR), Madrid (MAD) or Toulouse-Blagnac (TLS). These are usually the most efficient & cheaper routes. For Europe continental flights (including UK) : There is a lot of shuttle flights throughout the day going to Toulouse (TLS) from all the above airports. To maximize the efficiency and make some savings, we recommend booking the second leg separately.
Train
Train from Paris to Cahors : 6-7 h Train from Toulouse to Cahors: 2 h
Travel Note
More information about flights, trains, and lodging options on the google doc below.