MEGAPOST: Huge Jetstar sale on for the week. I've run every route they have, looking for cheap return flights. I've posted what I've found below as some examples. I haven't searched every date possible - it'd take too long, so there might even be cheaper out there.
All flights include 7kg carry-on luggage.
Adelaide to
Brisbane: 08/Mar to 07/Apr from $150, 27/Apr to 22/Jun from $145
Sunshine Coast: 03/May to 02/Jun from $129, 08/Mar to 05/Apr from $130
Gold Coast: 01/May to 22/Jun from $133, 14/Mar to 30/Mar from $145
Ayer's Rock/Uluru to
Brisbane 10/Mar to 07/Apr from $199, 19/Apr to 21/Jun from $202
Brisbane to
Adelaide 04/May to 22/Jun from $147, 08/Mar to 07/Apr from $149
Ayer's Rock/ Uluru 10/Mar to 31/Mar from $198, 17/Apr to 21/Jun from $194
Cairns 08/Mar to 30/Mar from $138, 19/Apr to 22/Jun from $134
Hobart 08/Mar to 27/Mar from $146, 08/May to 20/Jun from $135
Launceston 08/Mar to 28/Mar from $91, 27/Apr to 22/Jun from $86
Mackay 11/Mar to 07/Apr from $130, 27/Apr to 22/Jun from $126
Newcastle 03/May to 10/Jun from $86, 08/Mar to 30/Mar from $91
Whitsundays 09/Mar to 29/Mar from $97, 31/May to 18/Jun from $86
Townsville 04/May to 22/Jun from $173, 08/Mar to 31/Mar from $177
Cairns to
Brisbane 08/Mar to 02/Apr from $138, 27/Apr to 22/Jun from $134
Melbourne 05/May to 21/Jun from $206, 08/Mar to 13/Apr from $217
Newcastle 08/Mar to 13/Apr from $190
Gold Coast 04/May to 22/Jun from $116
Sydney 04/May to 22/Jun from $165, 09/Mar to 13/Apr from $168
Hobart to
Brisbane 08/Mar to 09/Apr from $140, 27/Apr to 18/Jun from $135
Hamilton Island to
Melbourne 03/May to 21/Jun from $205, 08/Mar to 16/Apr from $198
Sydney 08/Mar to 13/Apr from $187, 27/Apr to 17/Jun from $189
Launceston to
Brisbane 08/Mar to 07/Apr from $92, 30/Apr to 20/Jun from $90
Sunshine Coast to
Adelaide 03/May to 21/Jun from $128, 08/Mar to 07/Apr from $129
Melbourne 08/Mar to 07/Apr from $157, 27/Apr to 22/Jun from $155
Sydney 08/Mar to 12/Apr from $98, 27/Apr to 22/Jun from $94
Melbourne to
Cairns 13/Mar to 05/Apr from $217, 30/Apr to 16/Jun from $210
Hamilton Island 08/Mar to 29/Mar from $214, 24/Apr to 21/Jun from $218
Sunshine Coast 08/Mar to 05/Apr from $171, \24/Apr to 21/Jun from $152
Gold Coast 08/Mar to 05/Apr from $110, 28/Apr to 22/Jun from $106
Mackay to
Brisbane 01/May to 21/Jun from $128, 13/Mar to 12/Apr from $130
Newcastle to
Brisbane 03/May to 12/Jun from $86, 15/Mar to 31/Mar from $92
Cairns 08/Mar to 11/Apr from $190
Gold Coast to
Adelaide 10/May to 22/Jun from $137, 11/Mar to 29/Mar from $146
Cairns 04/May to 22/Jun from $114
Melbourne 10/Mar to 06/Apr from $116, 27/Apr to 22/Jun from $106
Sydney 05/May to 22/Jun from $73, 09/Mar to 02/Apr from $78
Whitsundays to
Brisbane 05/May to 21/Jun from $88, 12/Mar to 30/Mar from $92
Sydney to
Cairns 08/Mar to 05/Apr from $168, 26/Apr to 22/Jun from $165
Hamilton Island 08/Mar to 06/Apr from $187, 20/Apr to 19/Jun from $186
Sunshine Coast 08/Mar to 05/Apr from $98, 24/Apr to 22/Jun from $94
Gold Coast 08/Mar to 30/Mar from $78, 27/Apr to 22/Jun from $73
Townsville to
Brisbane 04/May to 22/Jun from $173, 08/Mar to 31/Mar from $177
For the dates, tables and routes, I've listed them all on the main link as it's very long - 5k words, as someone pointed out in the comments :).
You can follow us at Beat That Flight for more deals, error fares, promos and sales, or on Facebook, and also have a look at our current best found prices by other users by city - Sydney, Melbourne, Brisbane, Adelaide, Perth, Darwin, Hobart, Cairns, Canberra.
Wow, here's a vote for the great effort!