Delta Connection's last flight into Peoria will be on July 6.
That's according to an administrator's comment on Peoria Int'l Airport's flypia Facebook page.
I checked delta.com for present schedules, which show a single, weekday nonstop roundtrip between Peoria and Atlanta. Arrival (Flight #4832) is at 2:45pm and departure (Flight #4647) at 3:35pm. Flights are operated by a 50-seat CRJ200 belonging to Endeavor Air.
Another administrator's comment on PIA's Facebook page hopes the carrier returns in October.