A leftover burger is only a good idea until you reheat it badly. The patty dries out, the bun turns soggy or rock-hard, and the cheese either disappears or welds itself to the plate. The good news is that both the air fryer and the microwave can bring a burger back to life, as long as you know which one to pick and how to use it.
This guide compares the two methods side by side, with exact times, temperatures, and microwave wattage adjustments, so you can reheat a burger the right way whether you have two minutes or ten.
Quick Answer: Air Fryer or Microwave?
Use the air fryer when you want the best result. It reheats a ¼-lb patty in about 3 to 4 minutes at 350°F (175°C), re-crisps the outside, keeps the middle juicy, and toasts the bun.
Use the microwave when speed matters more than texture. It reheats the same patty in about 60 to 90 seconds at 50% power, but the patty ends up softer and the bun needs careful handling to avoid turning chewy.
Whichever you choose, take the burger apart first and make sure the patty reaches 165°F (74°C) in the center.
Related: Oven to Air Fryer Converter
Air Fryer vs Microwave: Side-by-Side Comparison
The difference comes down to how each appliance heats food. An air fryer circulates hot, dry air, which warms the patty from the outside in, re-crisps the surface, and lets excess moisture escape. A microwave agitates the water molecules inside the food, which is fast but steams the patty from within and leaves bread soft at first and tough once it cools. That is why the same burger can taste freshly cooked from the air fryer and tired from the microwave.
Burger Reheating Food Safety: What to Know First
Reheating only works if the burger was stored properly in the first place. These guidelines line up with the USDA’s advice on leftovers and food safety:
- Refrigerate within 2 hours of cooking or serving. On a hot day above 90°F (32°C), cut that window to 1 hour.
- Eat within 3 to 4 days if refrigerated, or freeze for up to 3 to 4 months for best quality.
- Reheat to 165°F (74°C), measured with a food thermometer in the thickest part of the patty. Ground beef is cooked to 160°F the first time (see the FoodSafety.gov safe minimum temperature chart), but leftovers should be brought to 165°F when you reheat them.
- Cover the patty in the microwave and flip or rotate it so it heats evenly.
- Frozen leftovers can be reheated without thawing, but plan on extra time.
- Reheat only what you will eat. A burger loses moisture every time it is heated.
- When in doubt, throw it out. Never taste-test a burger of unknown age. This Michigan State University Extension guide has more on storing leftovers safely.
How to Reheat a Burger in the Air Fryer
What you need: an air fryer, tongs or a spatula, and an instant-read thermometer. A little butter or oil spray is optional.
- Take the burger apart. Remove the lettuce, tomato, onion, pickles, and sauce, because they turn limp and unpleasantly warm. Set the bun halves aside.
- Preheat the air fryer to 350°F (175–180°C) for 2 to 3 minutes. A hot basket gives you crisp edges instead of a gray, steamed surface.
- Place the patty in a single layer with space around it. If it looks dry, brush it with a little butter or beef drippings, or give it a light spray of oil.
- Heat for 3 to 4 minutes, flipping halfway. A thick pub-style patty needs 5 to 7 minutes.
- Add cheese for the last 30 seconds if you want a fresh melt.
- Toast the bun cut-side up in the same basket for the final 1 to 2 minutes. Check at 60 seconds, because buns brown fast.
- Check the temperature. Insert a thermometer into the center of the patty. If it is below 165°F (74°C), heat for another 30 seconds and check again.
- Rest for a minute, then reassemble with fresh toppings and sauce.
Air Fryer Burger Reheating Tips
- Don’t crowd the basket. Hot air needs to circulate around each patty. Reheat in batches if you have several burgers.
- Start with the shorter time. Small basket-style air fryers heat faster than large oven-style models, so check early.
- Lower the temperature if the edges brown too fast. Drop to 325°F (160°C) and add a minute.
- In a hurry and can’t take it apart? Remove the wrapper and any cold toppings, set the air fryer to 300°F (150°C) for 4 to 5 minutes, and confirm 165°F in the patty. The lower heat keeps the bun from burning.
- Working from oven instructions? Our Oven to Air Fryer Converter turns oven temperatures and times into air fryer settings.
How to Reheat a Burger in the Microwave
What you need: a microwave-safe plate, paper towels, and an instant-read thermometer.
- Separate the bun and the patty, and remove cold toppings. Bread and meat respond very differently to microwaves, so they need different treatment.
- Put the patty on a microwave-safe plate. Add a teaspoon of water or broth, or a small pat of butter, on top for moisture.
- Cover it with a damp paper towel. The steam keeps the patty from drying out and helps it heat through.
- Set the power to 50%. Full power overheats the edges before the center warms up, which is how patties turn rubbery.
- Heat for 30 seconds, flip, then heat for 30 more. Continue in 15 to 20 second bursts until the center reaches 165°F (74°C).
- Warm the bun separately. Wrap it in a damp paper towel and microwave for 10 to 15 seconds at full power. Stop as soon as it feels warm, because over-heated bread turns hard as it cools.
- Melt the cheese last. Lay a slice on the hot patty for 5 to 10 seconds.
- Let it stand for 1 minute so the heat evens out, then reassemble.
Adjusting for Your Microwave’s Wattage
The times in Table 3 assume a 1000W microwave. You will find your wattage on a label inside the door or on the back of the unit. Multiply the times by the factor in the chart below. For example, a 60 to 90 second reheat at 1000W becomes roughly 85 to 125 seconds at 700W.
Microwave Burger Reheating Tips
- Never use foil or metal in the microwave, including twist ties and foil wrappers.
- Keep the patty in a single layer. Stacked patties heat unevenly.
- Flip the patty halfway, even if your microwave has a turntable.
- Stop the bun early. Ten seconds too long is the difference between soft and stale.
Hybrid Method: Microwave First, Air Fryer Second
If you want speed and texture, combine the two. Microwave the patty at 50% power for 30 to 45 seconds to take the chill off the center, then move it to a 350°F (175°C) air fryer for 1 to 2 minutes to restore the crisp edges. The whole process takes about 4 to 5 minutes including preheat.
This works especially well for thick patties and frozen patties, where the air fryer alone can brown the outside before the middle is hot.
How to Reheat a Frozen Burger
You can reheat a cooked burger straight from the freezer, and the USDA confirms that frozen leftovers can be reheated without thawing. It just takes longer.
- Best results: thaw the patty overnight in the refrigerator, then use the refrigerated times above.
- Air fryer from frozen: 350°F (175°C) for 8 to 10 minutes for a ¼-lb cooked patty, flipping halfway. Confirm 165°F in the center.
- Microwave from frozen: defrost at 30% power for 2 to 3 minutes, flip, then heat at 50% power for 60 to 90 seconds.
- Buns: let them thaw at room temperature for 10 to 15 minutes before toasting. Frozen bread goes tough in the microwave.
Which Method is Best for Your Burger?
The right choice depends on the type of burger and how much time you have. Use this chart to pick the best method for your situation.
Common Burger Reheating Problems and How to Fix Them
Most reheating disasters come down to too much heat, too much time, or reheating the bun and patty together. Here is how to fix the usual problems.
The Verdict: Air Fryer or Microwave?
The air fryer wins on quality. It gives you a patty with crisp edges and a juicy middle, plus a properly toasted bun, and it handles a batch of burgers at once. The cost is a few extra minutes for preheating and cooking.
The microwave wins on speed and convenience. It is the right tool for a quick lunch at the office or a dorm room with no air fryer, and it works well if you cover the patty, drop the power to 50%, and heat the bun separately.
If you have both, use the hybrid method for thick or frozen patties and the air fryer for everything else.
Frequently Asked Questions
Is it better to reheat a burger in an air fryer or a microwave? The air fryer gives better texture, with a crisp patty and toasted bun. The microwave is better when you only have a minute or two and are willing to trade some texture for speed.
How long does it take to reheat a burger in the air fryer? A refrigerated ¼-lb patty takes 3 to 4 minutes at 350°F (175°C) after a 2 to 3 minute preheat. Thick patties need 5 to 7 minutes. Toast the bun in the same basket for the last 1 to 2 minutes.
How long does it take to reheat a burger in the microwave? About 60 to 90 seconds at 50% power in a 1000W microwave for a ¼-lb patty, plus 10 to 15 seconds for the bun on its own. Lower-wattage microwaves need more time, so use the wattage chart above.
Should I reheat a burger with the bun on? You can, but the results are worse. The bun and patty need different amounts of heat, so separating them gives a hot patty and a warm, soft or toasted bun instead of a soggy or hard one.
Can you reheat a burger twice? It is possible to do safely if the burger is refrigerated within 2 hours and brought to 165°F (74°C) each time, but the quality drops quickly. Reheat only the amount you plan to eat.
Is it safe to eat a burger that was left out overnight? No. Food left out for more than 2 hours (1 hour above 90°F) should be thrown away. Some bacteria produce toxins that reheating does not destroy.
Can I reheat a burger from frozen? Yes. Use the air fryer for the best texture (8 to 10 minutes at 350°F), or defrost in the microwave at 30% power first. Thawing overnight in the fridge gives the most even results.
Do I need to add oil when reheating a burger in the air fryer? No. A cooked beef patty already contains plenty of fat. A light brush of butter or oil spray only helps lean patties such as turkey, chicken, or veggie burgers.
