American Airlines has ticket prices under $400 from Chicago and Orlando to Paris, $410 from Denver and $432 from New York JFK for travel January 11 to May 10. These are all Icelandair airports and fares to Paris, Amsterdam, Brussels, London, Manchester, Munich and Frankfurt have been in $400s and low $500s for weeks. This is a good fare drop with American Airlines.
If AA is not your preferred carrier, there are ticket prices in the $400s with Delta/Skyteam and United/Star Alliance carriers from Denver, Chicago, Orlando, Washington IAD, Boston and New York.
These American Airlines fares under $400 are the real deal.
American Airlines Chicago ORD – Paris CDG nonstop
American Airlines Orlando MCO – Paris CDG
American Airlines Denver DEN – Paris CDG
American Airlines Denver DEN – New York JFK