Oakland acquired Flynn in April from Seattle for a 2014 fifth-round draft pick and a conditional pick in 2015. The Raiders also reworked Flynn's contract to give him $6.5 million in guaranteed money this season.
But Flynn was beaten out for the starting job by Terrelle Pryor and fell to third string behind undrafted free agent Matt McGloin last week.
"It just didn't work," Coach Dennis Allen said. "Terrelle came in and he took over the job. He's earned the position that he's in. So, we just felt like it's probably best to move on from that."
Flynn made two appearances for Oakland. He came in late in a loss at Denver on Sept. 23 after Pryor suffered a concussion and started against Washington the week after.
After spending four years as the backup to Aaron Rodgers in Green Bay, Flynn was one of the most sought-after quarterbacks on the free-agent market in 2012 based largely on one dynamic start. Flynn threw for 480 yards and six touchdowns in the 2011 season finale for the Packers against Detroit.
Seattle signed Flynn and paid him $8 million last season even though he was beaten out for the starting job by rookie Russell Wilson.
Minnesota's quarterback this weekend will be Matt Cassel or Christian Ponder, not Josh Freeman.
Beyond Sunday's game against Carolina, well, there's no guarantee for anyone.
The Vikings were finalizing Freeman's contract four days after the 25-year-old was cut by Tampa Bay. He didn't make it in time for practice but was scheduled to arrive later, and Freeman and General Manager Rick Spielman were scheduled to address reporters in an evening conference call.
This was the only definitive word from Frazier: There's not enough time for Freeman to learn the offense and play against the Panthers.
Although Freeman agreed to a prorated $3-million deal for the rest of the season, the next three months will be a feeling-out process for both sides in advance of the free-agent market.
Panthers' Steve Smith calls game official 'garbage'
Receiver Steve Smith is still upset with the officiating in Carolina's 22-6 loss to the Arizona Cardinals, calling a member of Sunday's crew "garbage."
Smith said that umpire Dan Ferrell was "the sorriest referee I've ever met" and added that
Ferrell "received a check that day and I hope he feels good, because he was terrible."