Next spring as in a year from now? Rates will change hundreds of times between now and then. Your best bet is to just book the best rate you can find and use the link below to track the rate. I can't guarantee that there will not be a drop fee, but at least by starting to track the rate this far out, you'll have long time horizon for us to look for better rates.

Note that many booking sites (including ours) can only search a maximum of 330 days out, so if your return rate is farther out than that, you'll have to wait until you reach the 330 day mark to request a quote and/or enter an existing booking for tracking.