A domain is not deleted the day it expires. It passes through three phases first.
Grace: up to 45 days for .com. The registrar may renew the name for the owner or sell it at auction.
Redemption: 30 days. Only the previous owner can get the name back, at a fee.
Pending delete: 5 days with no way back. Then the name drops, anyone can register it, and backorder services try to catch it the second it goes.
Country-code extensions have their own timings. The drop schedule lists them.
Is the drop date exact? No. The registry gives the expiry date, and a registrar may act earlier within the phases. Once a name is in pending delete, the date is reliable to the day.
How many lookups can I run? 10 a day for free, 25 with the free drops digest, 200 as a member.
Every morning or every Monday: the strongest domains that just dropped, with Trust Flow, Domain Authority, Domain Rating and age. Free, one click to stop.