A flat tire repair cost mostly depends on the extent of the damage. A simple repair costs somewhere between $15 and $30. This would involve the use of plugs to fill the leaks. These plugs usually last for a long time but it is always a good idea to get them checked regularly. Alternatively, your flat tire could also use a sealant which will cost around $15. Using a sealant, however, is a temporary solution since it lasts for 50 to 100 miles at most. A new tire will be priced somewhere between $100 and $200 depending on the model of the car and the quality of the tire.