A league-mandated deadline for teams to declare a sellout is typically 72 hours prior to kickoff. So any team with a 1 p.m. kickoff time on Sunday, must be declared a sellout by 1 p.m. on Thursday -- it should be noted that "declared" means submission to the league office (not when you're informed). If there's a reasonable chance that Cincinnati will sellout, then the team can request a 24-hour extension.
On Tuesday, Andrew Brown, the team's ticket sales manager, wasn't particularly optimistic that Sunday's game would sell out. Since then, sales have improved. If the team can maintain "three great days" of sales (including today) through Friday (suggesting the hope of an extension), the team could make it.
#Bengals ticket mgr Andrew Brown on TV blackout: "I’m a bit more optimistic sitting here today than I was at this time yesterday,"...cont'd— Jay Morrison (@JayMorrisonCMG) September 17, 2014
#Bengals ticket mgr. Andrew Brown, cont'd: "but we still have a lot of ground to cover in the next 1-2 days to avoid a blackout. "— Jay Morrison (@JayMorrisonCMG) September 17, 2014
The Bengals have currently sold out 12 consecutive regular season and postseason home games. The last television blackout was when the Bengals hosted Oakland on Nov. 25, 2012. Cincinnati went through an 11-game stretch where 10 games were blacked out from the middle of 2010 into 2011; they've since ended up selling out in all but two games in 2012 and every game in 2013.
Tickets for Sunday’s game may be purchased here. Fans also may contact Ticketmaster by phone at 800-745-3000. Tickets also may be purchased through the Bengals Ticket Hotline at 513-621-8383, or toll-free at 866-621-8383 (TDTD), or in person at the Paul Brown Stadium ticket office.