Experts say the eruption appears to be winding down.
"There were very few eruptions by the volcano over the last six to 12 hours so the volcano is in a reasonably calm state at the moment," said Brian Flynn, head of network operations for Eurocontrol.
A volcano expert in Iceland also said that observers at the crater were reporting only steam, an indication that the eruption could be nearing its end.
Airports in Bremen, Hamburg and Luebeck have been closed for hours.
European air traffic controllers expected about 700 flights to be cancelled on Wednesday, but since the volcanic ash cloud appears to be dissipating, air traffic is expected to return to normal on Thursday.
Flights have also been canceled at two of Berlin's airports.
There are no cancellations at LAX.
The Associated Press contributed to this story.