For SkyWest when cancelling IFR inbound the Ops Specs say:
Terminal arrival VFR. If operating under the VFR en route provisions of B051 or if cancelling an IFR flight plan, the flightcrew may operate under VFR in the terminal area under the following provisions. . .
(1) All of the following provisions and weather conditions at the airport at the time of approach must be met:
(a) Reported visibility must be specified in Section 91.155, but not lower than the visibility critieria specified in Section 121.649 or Section 135.205, as applicable.
(b) Reported ceiling must be 1,000 feet or greater
(c) The flightcrew must maintain the basic cloud clearance as specified in Section 91.155.
(d)Ceiling and cloud clearance must be such to allow the flightcrew to maintain the minimum altitudes prescribed in Section 91.129, 91.130, or 91.131, as applicable for the Airspace Class in which the flight is operated.
(2) In addition the conditions in one of the following paragraphs must be met:
(a) Controlled Airports. The flight is operated within Class B, C, or D airspace, or within 10 miles of the destination airport in Class E airspace; and remains within controlled airspace. The flightcrew requests and uses radar-monitored traffic advisories provided by ATC when such advisories are available, and is in direct communications with the appropriate ATC facility.
(b) Uncontrolled airports. The flightcrew is in direct communications with and air/ground communication facility or agent of the certificate holder that provides airport traffic advisories and information that is pertinent to conditions on and around the landing surface during the terminal phase of flight; and the flight is operated within 10 nautical miles (nm) of the destination airport, or visual reference with the landing surface is established and can be maintained throughout the approach and landing.