Sn�gs' post applies more to package holidays than it does to individual flights. Budget flights are sold on the basis that the tickets are strictly non-refundable.
easyJet fly to Jersey from Liverpool. They don't offer any refunds:
http://tinyurl.com/n47fo4
Jet2 fly to Jersey from Belfast and Leeds Bradford. Again, no refunds:
http://www.jet2.com/questions/cancellations-re funds.aspx
I'd be
extremely surprised if the policies of bmiBaby, Air SouthWest, Aurigny, BA, or any other airline flying to Jersey, are any different.
Chris