How far you can drive on a flat depends on your tire type and speed, but the answer is almost always "not far enough"
A completely flat tire — one with zero air pressure — should not be driven on at all. You will destroy the sidewall within a few hundred feet, and the tire becomes unsafe to repair. If you have a flat, you have three options: call for a tow, change to your spare, or use a tire plug kit if you have a small puncture and a portable pump. Driving on a flat tire damages the wheel rim, suspension, and brake components, and the repair bill quickly exceeds the cost of a tow.
If your tire is not completely flat but severely underinflated — say, 5 to 10 pounds per square inch when it should be 30 to 35 — you may be able to limp to a gas station or repair shop at very low speed. This is not safe and not recommended, but it is sometimes the least bad option if you are on a highway with no shoulder and traffic is heavy. The distance you can cover this way is usually measured in miles, not tens of miles, and the tire will likely be ruined by the time you arrive.
Key Takeaways
- A completely flat tire should not be driven on; you will damage the sidewall and wheel rim within a few hundred feet.
- A severely underinflated tire (5 to 10 psi) may allow you to reach a repair shop at very low speed, but the tire will likely be destroyed in the process.
- Driving on a flat or near-flat tire risks damage to your suspension, brakes, and wheel alignment, which costs far more than a tow or a new tire.
- Your spare tire is designed to get you to a repair shop safely, not to be a permanent replacement or to be driven at highway speeds for long distances.
What happens to your tire when you drive on it flat
When a tire loses all or most of its air, the sidewall — the flexible part of the tire between the tread and the rim — collapses under the weight of the vehicle. The rubber heats up rapidly from friction with the road, and the internal structure separates. Within a few hundred feet of driving on a completely flat tire, the sidewall is torn and the tire is no longer repairable. A tire shop will refuse to patch or plug it.
The rim itself also takes damage. As the tire deflates, the bead — the edge of the tire that seats against the rim — loses its seal. Driving on a flat tire can bend or crack the rim, especially if you hit a pothole or curb. A bent rim cannot hold air and must be replaced, which costs $150 to $400 depending on the vehicle and wheel size.
Your suspension and steering components also suffer. The shock absorbers and struts are designed to work with properly inflated tires. A flat tire removes that cushioning, and every bump transfers the full impact to the suspension. Your alignment can shift, and you may damage the tie rods or control arms. These repairs cost $500 to $1,500 or more.
When you might drive a short distance on a severely underinflated tire
If your tire is not completely flat but has lost most of its pressure — typically 5 to 10 psi when it should be 30 to 35 — you may be able to drive slowly to the nearest gas station or tire shop. This is a last resort, not a normal repair strategy. You should drive at no more than 20 miles per hour, avoid turns and braking hard, and stop every few blocks to check the tire.
This approach works only if you have a small puncture (a nail or screw, not a sidewall tear) and you can reach a repair location within a mile or two. If you are on a highway, in heavy traffic, or more than a few miles from help, do not attempt this. Call for a tow instead. The risk of losing control, hitting another vehicle, or causing an accident far outweighs the cost of a tow truck.
Even if you reach a repair shop this way, the tire may be damaged beyond repair. The sidewall may have flexed too much, or the internal structure may have separated. You may end up paying for a new tire anyway, plus the cost of the tow you were trying to avoid.
Using a spare tire to reach a repair shop
Your spare tire — whether it is a full-size wheel or a compact "donut" spare — is designed to get you to a repair shop safely. A full-size spare can usually be driven at normal highway speeds for up to 70 miles, though you should still have the flat tire repaired or replaced as soon as possible. A compact spare should be driven at no more than 50 miles per hour and for no more than 70 miles total.
To change to your spare, pull over to a safe, level location away from traffic. Loosen the lug nuts on the flat tire while the vehicle is still on the ground, then use the jack to lift the vehicle. Remove the lug nuts completely, take off the flat tire, and mount the spare. Hand-tighten the lug nuts, lower the vehicle, and then tighten them fully in a star pattern (opposite sides alternately) to may support even pressure.
After you install the spare, drive directly to a tire repair shop or dealership. Do not treat the spare as a permanent tire. Driving on a spare for weeks or months can damage your transmission, differential, and brakes because the spare is usually a different size than your regular tires. The vehicle's anti-lock braking system and traction control may also behave unpredictably.
Portable tire repair kits and when they work
A tire plug kit — a small container with rubber plugs, a reaming tool, and adhesive — can repair a small puncture in the tread of a tire if you also have a portable air pump. These kits cost $10 to $30 and are sold at auto parts stores and online. They work only on punctures smaller than a quarter-inch in diameter, and only in the tread area, not the sidewall.
To use a plug kit, locate the puncture, remove the object that caused it, and use the reaming tool to clean and slightly enlarge the hole. Insert a rubber plug coated with adhesive into the hole, trim the excess, and inflate the tire with your portable pump. The repair is temporary and should hold long enough to reach a tire shop, where a professional can explore a permanent patch or replace the tire if needed.
Plug kits are useful for minor punctures on a road trip or when you are far from a repair shop, but they are not a substitute for a spare tire or a tow. They do not work on sidewall damage, large punctures, or leaks around the valve stem. If you use a plug kit, plan to have the tire professionally inspected within a few days.
Tire pressure monitoring and catching problems early
Most vehicles built after 2007 have a tire pressure monitoring system (TPMS) that alerts you when one or more tires drop below the recommended pressure. The warning light usually appears when pressure falls to about 25 percent below the target — for example, 22 psi on a tire that should be 30 psi. This gives you time to find a gas station or repair shop before the tire becomes dangerously flat.
Check your tire pressure monthly using a pressure gauge, even if your TPMS light is not on. The monitoring system detects large, sudden drops but may miss a slow leak that develops over weeks. Proper tire pressure improves fuel economy, extends tire life, and reduces the risk of a blowout. Your vehicle's recommended pressure is printed on a sticker inside the driver's door jamb, not on the tire itself.
If your TPMS light comes on, do not ignore it. Drive to a gas station or tire shop at moderate speed and check all four tires. A slow leak can often be repaired for $15 to $30 if you catch it early. If you wait until the tire is completely flat, the repair cost rises and you risk damage to the rim and suspension.
What to do if you get a flat on the highway
If you have a flat on a highway or in heavy traffic, do not attempt to change the tire or drive on it. Turn on your hazard lights, slow down gradually, and move to the shoulder as far from traffic as possible. If you cannot reach the shoulder safely, stay in your vehicle with the seatbelt fastened and call 911 or a roadside information service. A tow truck will arrive faster than you can change a tire, and you will be safer inside the vehicle than standing on the roadside.
If you do have a spare and feel comfortable changing the tire on the shoulder, wait for a gap in traffic, set up warning triangles or flares behind your vehicle if you have them, and work as quickly as possible. Keep your hazard lights on and watch for approaching vehicles. Once the spare is installed, drive at reduced speed to the nearest exit and find a repair shop.
Roadside information memberships through AAA, your auto insurance company, or your vehicle manufacturer cover tows and tire changes. If you do not have a membership, a tow to the nearest repair shop typically costs $75 to $150 depending on distance. This is far cheaper than the damage caused by driving on a flat tire.
Frequently Asked Questions
Can I drive on a flat tire to get to a tire shop?
Not safely. A completely flat tire will destroy the sidewall and rim within a few hundred feet. If the tire is severely underinflated but not completely flat, you may limp to a nearby shop at very low speed, but the tire will likely be ruined. Your best option is to change to your spare or call for a tow.
How long does a spare tire last?
A full-size spare can be driven for up to 70 miles at highway speeds. A compact donut spare should be driven at no more than 50 mph and for no more than 70 miles. After that, have the flat tire repaired or replaced and return to using four matching tires. Driving on a mismatched spare for weeks damages your transmission and brakes.
Will a tire plug kit work on any puncture?
No. Plug kits work only on small punctures (smaller than a quarter-inch) in the tread area. They do not work on sidewall damage, large holes, or leaks around the valve stem. A professional tire repair is permanent; a plug kit is temporary and should be followed by a professional inspection within a few days.
What does the TPMS light mean?
The tire pressure monitoring system light indicates that one or more tires have dropped to about 25 percent below the recommended pressure. Check all four tires with a pressure gauge and inflate them to the pressure listed on the driver's door jamb sticker. If the light stays on after you inflate the tires, you may have a slow leak and should visit a tire shop.
Is it safe to drive on a flat tire in an emergency?
Driving on a flat tire is never safe. It increases the risk of losing control, especially in wet conditions or at higher speeds. It also causes expensive damage to the rim, suspension, and brakes. If you are in an emergency, call 911 or roadside information. A tow is faster and safer than attempting to drive on a flat.