Taxi:

It’s cheaper to book an Uber rather than hail a cab, which will come and pick you up from the “Kiss & Fly” drop off zone on the 1st floor of Terminal 2. 

Train:

Take the L2 tram outside Terminal 1 & 2 towards Port Lympia. It is free to ride one stop to Grand Arénas which is opposite Saint-Augustin train station. Take a direct train to Cannes from there. The journey time is just under 30 minutes and less than £15 return

Note: Last tram is 21.01 but Saint-Augustin station is only a 10 minute walk from Terminal 1. The last train from Saint-Augustin to Cannes is 21.32 and arrives at 22:00. The last bus to Cannes is the number 81 and leaves the bus station at Terminal at 22:00 and takes 46 minutes. Last bus from Nice Airport to Cannes.