What cancellation rules apply depends on your fare type (refund‑eligible or non‑refundable) and whether it’s a domestic or international booking.
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There’s a 24‑hour “no‑risk” window if you booked directly, where you can cancel without fee.
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For refundable tickets, you’ll often get a refund (minus any fees). Non‑refundable fares might get credits instead or no... https://getmesky.com/qantas-airways-cancellation-policy/