Hi Melinda,
I hope it's not too late. What about the following itinerary?:
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Vigo -> Santiago de Compostela (bus/train)
Santiago de Compostela -> Málaga (plane)
(
Spanair.com 39 euros + taxes, subject to availability).
Málaga -> Granada (bus/train)
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I guess it will be a bit difficult to arrange the timetables. Unfortunately, there are no direct Vigo -> Granada flights (only Vigo -> Madrid / Madrid -> Granada with Iberia but it will cost you about 230 euros one way
)
PS: By the way, at Spanair call center they told me there are no tickets available for that offer on the 25th,26th,27th,28th. Only for the 24th.