VHSS - VHHH is a mere 16 miles and is F0 J1 Y9
Then obviously theres the other helipad ones which are actually used heavily irl like:
KJRB - KEWR with 9 miles and F1 J7 Y53
KJRB - KLGA with 8 miles and F1 J7 Y51
KJRB - KJFK with 13 miles and F1 J8 Y57
For full sized airports I guess KDCA - KIAD with 23 miles and F2 J14 Y98
or KMDW - KORD with 15 miles F2 J15 Y104
or KLGA - KJFK