Can I use flyer miles on Orbitz?

So I'm buying a single rount trip ticket to florida on the 27th, and the lowest prices by far are Orbitz.
I fly delta, and have more then 1,200,000 frequent flyer miles in my account. Yes, 2 million and 2 hundred thousand miles.
anyway.
I was wondering if I could use the miles via Orbitz, or if I would have to fly Delta (and thus use over 200,000 of them on a single round trip ticket)
Can anyone give me a solid answer?

I'm quite sure you have to book it directly with Delta to use the miles. Miles ain't what they used to be though, so be prepared to shell out $50-200 for the privilege of using your miles.