UK to Toulon to Cannes
First, the price. Yes, it’s hard to beat Toulon for price if you are arranging flights at the last minute. But €110 is about the same as comparable Easyjet flights if you book in time (please do!).
Also, Toulon is about 120 kilometers from Cannes. The good news is that Toulon is on the main train line between Marseilles and Nice. You will have to add 1’20” to your travel time, plus the time to get from the airport to the station. There are not all that many buses, so factor that in when booking. Train tickets can cost between €15-38, with the average price being about €25.
So at the end of the day, if you add in the time you will take to get to Southampton or London City airport, this could be one long trip. On the other hand, the airport itself is a pleasant local airport. So checking in is a breeze.
Maps and other info
The Toulon airport website for tickets
This leads to the map for getting to Cannes from Toulon.