Fares vary depending on the season and the airline. In the high season, from mid-May through August and December to mid-January, airfares are about $200 to $400 higher than in the low season (from mid-January through February, and October to mid-November).
To get the best deals, shop around and compare prices. Garuda currently offers low-season flights from $1800, while most Asian airlines' Paris fares fall into the $2000 to $2400 bracket and include a side trip within Europe.