RE: Saying no..
You have to realize that your dad might let you stay, but he will be annoyed. Most plane tickets, especially purchased on such short notice, are non-refundable. Whatever he paid for it (probably quite a bit) is going to be money wasted. On the other hand, he will probably let you stay home if you insist, as I doubt he wants a grouchy companion on a long ride.
If you haven't made that trip by car before, it could be interesting too and might be worth missing the party for -- consider that.
If your final decision is that you want to stay, then I'd have to agree with NiteMare. Just tell your dad the real reason why (point out that you had committed to the party before the trip came up) and ask if you can stay.
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