I'm flying on one of suckage Arline's (delta) next month, and am stuck paying $150. I'm fling to Canada, and heard horror stories about shipping UPS OR FEDEX and having the bike delayed in customs for long times, so I am flying with it and hoping for the best.
If you are not going to do several rides, I would just rent a bike at your destination. Just bring your own gear. I had good success using a rental bike in Alaska two times now, cheaper overall, no hassle flying/shipping, damage worry etc. I packed my own saddle, pedals, shoes etc, etc