Get ready for double-digit increases for the expenses traveling employees turn in.

For 2009, domestic airfares are expected to increase 12% while international fares will increase between 16-20%. That’s according to Carlson Wagonlit Travel. Much of the increase is driven by fuel surcharges and the fact that airlines are cutting the number of seats per route.

If travelers can avoid taking a plane, your company’s travel costs should be reasonable next year. Carlson predicts hotel rates will increase only slightly next year, due to less demand. And car rental rates are expected to stay flat.

Tags: Cutting costs, Economic outlook, T&E