than a bus ticket!
is it worth it?

I can't really say about flights, since I did that same route by bus, but I can tell you that it was my first and last time... 8 hours of bus which cost me about 80 reals and I would have taken a flight had I known how horrific that trip would be...
I think the company Gol has the flight that you are looking for. check their site for prices.
Good luck!

Does anybody know how can I verify the cost of a flight or bus from fortaleza to natal? I don't speak portuguese, so if there's a site in english, that'd be great!
thanks.