SINGAPORE - Expect flight delays due to stricter security checks after a deadly terrorist attack in Paris, Singapore Airlines (SIA) has said.

Customers are advised to plan ahead and arrive early at the airport for their flights, SIA added.

France closed its borders after the attacks on Friday that killed 129 people, but kept airports and trains operating.

Other European countries have tightened security checks after the attacks, and Singapore raised its security alert level on Saturday.

SIA said that it will also waive all fees for re-booking or re-routing, for customers arriving at or departing from Paris.

The waiver is valid for tickets issued up to Nov 14, for travel to and from Paris on or before Nov 30.

Travel dates can be extended up to Jan 31, 2016.

While the airline's current flights to and from Paris are operating normally, the situation is fluid, and customers were asked to check the status of their flights, SIA said in a statement on Saturday (Nov 14).

"Singapore Airlines is deeply saddened by the terrible events in Paris," SIA said in its statement.