When did Seahawks convert from AFC to NFC?

Answer 1

They debuted in 1976 in the NFC, then were switched to the AFC in 1977; the split conference deal was arranged so the Seahawks, as an expansion team, would play every other team in the league in their first two seasons. The Seahawks spent 25 seasons in the AFC but were switched back to the NFC in 2002.

Answer 2

They never did. The only team to switch from the AFC to the NFC is the Seattle Seahawks.

Answer 3

2002