Toulon is easily accessible by car, train and airplane.
Here is the list of links to help you find detailed solutions to your needs.

Arrival at Paris airports (Paris-Orly airport or Paris-Charles de Gaulle airport)

1- From Paris-Orly airport to Toulon-Hyères airport by plane

Via Air France or Hop! (low cost) flight companies (flying time 1h20) and take the airport shuttle from Toulon airport to Toulon down-town (30 min).

2- From Paris-Orly airport to Toulon train station by train (via Paris-Gare de Lyon train station)

a) Take the Air France bus (line 4) from Paris-Orly airport to Paris-Gare de Lyon train station.
Or
Take OrlyVal and RER (Line B) suburban trains between Paris-Orly airport and central Paris (Châtelet-Les Halles station) and then take the metro (line M14) to Paris-Gare de Lyon train station.
b) Take the train from Paris-Gare de Lyon train station to Toulon train station (travel time to Toulon approx. 3h50). The train station of Toulon is located right in the centre of Toulon and is only about 15 min walk away from the Palais Neptune – Toulon Convention Centre.

3- From Paris-Charles de Gaulle airport to Toulon-Hyères airport by plane (via Paris-Orly airport)

a- Transfer from Paris-Charles de Gaulle airport to Paris-Orly airport

Take the RER (Line B) suburban train (direction St Rémy-lès-Chevreuse) and then the OrlyVal (OrlyVal is the automatic train that connects Paris-Orly Airport with the Antony station on the RER line B suburban train).

b- From Paris-Orly airport to Toulon-Hyères airport by plane

Via Air France  or Hop! (low cost) flight companies (flying time 1h20) and take the airport shuttle from Toulon airport to Toulon down-town (30 min).

4- From Paris-Charles de Gaulle airport to Toulon by train

Take the train directly from Paris-Charles de Gaulle airport to Toulon train station (travel time to Toulon approx. 4h50). The train station of Toulon is located right in the centre of Toulon and is only about 15 min walk away from the Palais Neptune – Toulon Convention Centre.

Arrival at Marseille-Provence airport

1- From Marseille-Provence airport to Toulon train station by train (via Marseille-Saint Charles train station)

Take the shuttle bus from the Marseille-Provence airport to Marseille-Saint Charles train station and then, take the train to Toulon train station. The train station of Toulon is located right in the centre of Toulon and is only about 15 min walk away from the Palais Neptune – Toulon Convention Centre.

2- From Marseille-Provence airport to Toulon train station by train (via Vitrolles-Aéroport Marseille Provence train station)

Take the shuttle bus to Vitrolles-Aéroport Marseille Provence train station and then, take the train to Toulon train station. The train station of Toulon is located right in the centre of Toulon and is only about 15 min walk away from the Palais Neptune – Toulon Convention Centre.

Arrival at Nice airport

From Nice airport to Toulon train station by train (via Nice-Ville train station)

Take the bus line 99 from the Airport to Nice-Ville train station and then, take the train to Toulon train station. The train station of Toulon is located right in the centre of Toulon and is only about 15 min walk away from the Palais Neptune – Toulon Convention Centre.

Travel to Toulon by car

Toulon is easy to reach from most European cities. The main roads are from east to west (and the opposite). There are highways from Nice (A57) and Marseille (A50). You’ll have to pay a toll to go outside the suburbs of the town on these highways.