An airbag replacement cost often varies wildly, sometimes as far apart as $1,000 and $6,000. The key factor to consider here is both the make and model of your vehicle, as well as the number of airbags that you'll be replacing. If more airbags deploy during an accident, the more you'll have to spend getting each one replaced. The type of airbag also determines the total airbag replacement cost. In most cases, the passenger side airbag (between $400 to $1,000) is costlier than the driver's side airbag (between $200 to $700). Meanwhile, a side curtain airbag will set you back roughly $200 to $700, while a knee airbag replacement cost would be somewhere around $400 to $1,000.