IPhone 5c to iPhone 6s plus?

So I have the two year plan with the iPhone 5c. I've had it for a year, maybe a little over. I want to get the iPhone 6s plus. Approx how much would it be? My carrier is sprint btw.

Well it would probably cost you 100$ or 200$ or between that to cancel the contract

You would have to pay to cancel your contract and then buy your new phone on a 2 year plan. In addition to charges for services, the iPhone 6s Plus would cost you about $32 a month additional.

Call Sprint and they will tell you current pricing.