Even though we aren't travelling until October, our dates are available now on Delta, American and United. I refuse to fly out at 8pm and return at 6am just to get the lowest fare so I don't even factor those options in when I look at prices. Out of GR, the fares are insane...over $500! And even going to DTW or FNT, which would require the additional cost of gas, parking and possibly an overnight hotel stay, the prices are still around $400. I've never paid more than $300 round-trip on any airline out of Michigan.
Just to compare, I looked at flights towards the end of SWA booking window. I also looked at Allegiant (from GR) and JB (from Chicago)....seriously?! Allegiant is over $350! And JB was $500

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@Tess...in May 2015, we flew non-stop from GR into TPA on the first fight of the morning. I rented a car through UnderCoverTourist for a one-way trip from TPA to the Car Care Center. I booked it with
Alamo and paid about $40 using UCT because Alamo wanted $85 for the same car! We landed at 9am on a Thursday, grabbed our checked bag and headed to the garage and got our car. We drove to AKL and stopped in the parking lot to get directions to Target put into our GPS (DH is a little tech-impaired and I was driving) and then proceeded towards the store. We stopped at the Chick-fil-a drive thru and when we hit the Target parking lot, I received a text that our room was ready. That text came at 11:15am. The reason I say this is because we had actually arrived at the resort about 30 minutes prior to that text which means that our landing to arriving at resort time was only an hour and 45 minutes...from Tampa! That's not too bad...and not that much more than DME from Orlando. We picked up groceries at Target and drove back to the resort. I dropped of DH, the kids and the luggage and then I headed to the CCC to return the car. They have a free shuttle that will take you back to your resort so that's what I did. I was gone all of 45 minutes

. After that experience, I will not hesitate to fly into TPA again if the price is right.