Carcassonnne airport is a 45 minute drive to Olonzac
www.aeroport-carcassonne.com (in French and English)
Flights to and from: LONDON STANSTED, MANCHESTER, EAST MIDLANDS, GLASGOW, DUBLIN, CORK, CHARLEROI, BRUSSELS, PORTO, ALICANTE
Montpelier airport is a 90 minute drive to Olonzac
www.montpellier.aeroport.fr (in French and English)
Flights to and from LONDON GATWICK, LEEDS, DUBLIN, CHARLEROI, PARIS ORLY, PARIS ROISSY CDG, AMSTERDAM, BASEL, BREST, BORDEAUX, COPENHAGEN, DUSSELDORF, FRANKFURT, LILLE, NANTES, ROTTERDAM, STRASBOURG
Beziers airport is a 60 minute drive from Olonzac: 
http://www.beziers.aeroport.fr/en
Destinations include Paris Beauvais, London Luton, London Stansted, Manchester, Bristol, Dusseldorf, Stockholm, Edinburgh.

Toulouse is a major airport a 90 minute drive to Olonzac:
http://www.toulouse.aeroport.fr/en
It has about 80 different International and local destinations 
Perpignan airport just over a 60 minute drive to Olonzac: 
http://www.aeroport-perpignan.com/en
Destinations include Ajaccio, Lille, Paris, London Southend, London Stansted, Brussels, Southampton, Nantes, 
Dublin, Birmingham, Marrakech.