Need to be selective on dates towards the middle to end of March. $439 is the best I could find. Use Google Flights to search.

Outbound flight
Mon, Mar 19

8:50 AM – 1:01 PM
Chicago (ORD) – Montego Bay (MBJ)
American 975 · Economy Class · Boeing 737
Average legroom (31")
4h 11m
Wi-Fi
In-seat power
Stream to your device
Return flight
Mon, Mar 26

2:05 PM – 6:28 PM
Montego Bay (MBJ) – Chicago (ORD)
American 976 · Economy Class · Boeing 737
Average legroom (31")
4h 23m
Wi-Fi
In-seat power
Stream to your device