Tickets on StubHub ranged from $124 for upper end-zone seats to $3,500 for club-level tickets. Tickets for field-level seats on the 50-yard line were going for as much as $895.
The Chargers announced last week that tickets for Sunday's playoff game through the team's ticket office were sold out.
"This is a great indicator of the excitement surrounding the team and the upcoming playoffs," Jim Steeg, the Chargers' executive vice president and chief operating officer, said in a statement.
The kickoff is set for 1:40 p.m. Sunday.