Originally Posted by
OroroT
I have also never seen Delta lower prices on upgrades to D1 shortly before flights. But I frequently get discounted last minute business class upgrade offers on KLM long-haul flights booked through Delta.com. These appear in the KLM app, but not the Delta app. Went from SFO-AMS in World Business Class for $680 just last month. Very airline specific on this policy it seems.
I'm not sure why you say that, it's frequently posted that D1 upgrades are offered for very reasonable prices right before the flight if the seats are available. I mean I upgraded to D1 from BNA -> HND for a little over $400 per seat last summer during peak season.