For the 21st day of the "24 days of Christmas" promotion at Scandinavian Airlines, the Lithuanian city of Vilnius is on sale...but SAS does not always come through with the cheapest price.

Here are some sample fares with the competition's price in parenthesis.

* Thu Jan 29 - Thu Feb 05: Newark (EWR) $882 w. 1 stop (Aeroflot $677 w. 1 stop)

* Sat Feb 07 -Sat Feb 14: Seattle (SEA) $934 w. 1 stop (Orbitz $921 w. 2 stops)

* Sun Mar 01 - Sun Mar 08: Chicago (ORD) $835 w. 1 stop (LOT Polish Air $785 w. 1 stop)

* Sun Mar 22 - Sat Mar 28: Washington (IAD) $678 w. 1 stop (Orbitz $763 w. 1 stop)

You must book by tonight to lock in these prices. To receive these advertised fares, you must travel between December 26, 2008 and May 14, 2009. Blackout dates are April 2, 2009 and April 19, 2009. For more information about these fares and other, go to Scandinavian Airlines.