For those in VIE or BUD, you can do a same day turn in ATH in 6 hours and train home same day. VIE-ATH-BUD is less miles, 1490 actual distance, for $88. So this is 5 cpm for Singapore, and 7 cpm for A3, but more convenient schedule if you need fewer miles or just the segments.

https://www.kayak.com/flights/VIE-BU...05-14-flexible

More:

WAW-ATH-CPH is $53.

WAW-ATH-HEL is $59.

HEL-ATH-WAW is $61.