Jetstar's running a "NSW sale". All flights are one way and include 7kg carry on.
Consider the best rated Sydney hotels with harbour views for accommodation.
Summary:
Adelaide - Sydney (1 May - 27 Jun) from $99
Adelaide - Sydney (15 Oct - 11 Dec) from $89
Adelaide - Sydney (24 Jul - 11 Sep) from $89
Brisbane - Newcastle (15 Oct - 11 Dec) from $59
Brisbane - Newcastle (24 Jul - 11 Sep) from $59
Brisbane - Newcastle (30 Apr - 26 Jun) from $59
Brisbane - Sydney (1 May - 13 Jun) from $59
Brisbane - Sydney (15 Oct - 11 Dec) from $59
Brisbane - Sydney (24 Jul - 11 Sep) from $59
Busselton Margaret River - Sydney (4 May - 27 Jun) from $135
Busselton Margaret River - Sydney (17 Oct - 5 Dec) from $135
Busselton Margaret River - Sydney (25 Jul - 14 Sep) from $135
Cairns - Newcastle (17 Oct - 26 Oct) from $95
Cairns - Newcastle (25 Jul - 9 Sep) from $95
Cairns - Sydney (1 May - 29 Jun) from $119
Cairns - Sydney (15 Oct - 11 Dec) from $117
Cairns - Sydney (30 Jul - 11 Sep) from $119
Darwin - Sydney (16 Oct - 30 Nov) from $155
Darwin - Sydney (29 Aug - 3 Oct) from $155
Hobart - Sydney (1 May - 30 Jun) from $65
Hobart - Sydney (6 Aug - 11 Sep) from $65
Hobart - Sydney (15 Oct - 18 Dec) from $65
Hervey Bay - Sydney (10 May - 5 Jun) from $79
Hervey Bay - Sydney (16 Oct - 10 Dec) from $69
Hervey Bay - Sydney (25 Jul - 9 Sep) from $69
Launceston - Sydney (15 Oct - 18 Dec) from $49
Launceston - Sydney (24 Jul - 11 Sep) from $49
Launceston - Sydney (30 Apr - 19 Jun) from $55
Sunshine Coast - Sydney (1 May - 29 Jun) from $60
Sunshine Coast - Sydney (15 Oct - 11 Dec) from $55
Sunshine Coast - Sydney (24 Jul - 11 Sep) from $55
Melbourne - Ballina (Byron Bay) (10 Jul - 11 Sep) from $90
Melbourne - Ballina (Byron Bay) (16 Oct - 11 Dec) from $80
Melbourne - Ballina (Byron Bay) (27 Apr - 15 Jun) from $95
Melbourne - Newcastle (15 Oct - 11 Dec) from $71
Melbourne - Newcastle (24 Jul - 11 Sep) from $71
Melbourne - Newcastle (30 Apr - 26 Jun) from $70
Melbourne - Sydney (15 Oct - 11 Dec) from $39
Melbourne - Sydney (15 Oct - 11 Dec) from $39
Melbourne - Sydney (24 Jul - 11 Sep) from $39
Melbourne - Sydney (24 Jul - 11 Sep) from $39
Melbourne - Sydney (30 Apr - 19 Jun) from $44
Melbourne - Sydney (30 Apr - 20 Jun) from $44
Gold Coast - Newcastle (15 Oct - 11 Dec) from $55
Gold Coast - Newcastle (24 Jul - 11 Sep) from $55
Gold Coast - Newcastle (30 Apr - 15 Jun) from $55
Gold Coast - Sydney (1 May - 27 Jun) from $60
Gold Coast - Sydney (16 Oct - 11 Dec) from $55
Gold Coast - Sydney (24 Jul - 11 Sep) from $55
Perth - Sydney (4 May - 28 May) from $193
Perth - Sydney (15 Oct - 4 Dec) from $178
Perth - Sydney (25 Jul - 11 Sep) from $178
Whitsundays - Sydney (15 Oct - 11 Dec) from $95
Whitsundays - Sydney (31 Jul - 11 Sep) from $95
Townsville - Sydney (15 Oct - 11 Dec) from $95
Townsville - Sydney (24 Jul - 11 Sep) from $95
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Can't imagine 7kg carry-on is much use for connecting flights to Athens, Guangzhou or Tokyo though. Might be suitable for hotter places (SG you could likely get away with).
And if youre wondering, both Scoot and Jetstar are likely to weigh. Their planes can handle whatever carry-on just fine, but if they can nickel and dime you they will.