The air fryer is the best tool for reheating fried fish because it re-crisps the breading without making it soggy. Set it to 350°F, give your pieces some space in the basket, and you’ll have crispy leftover fish in about 4 to 5 minutes. The process is simple, but a few details make the difference between fish that tastes freshly fried and fish that comes out dry or unevenly heated.
Why the Air Fryer Works Better Than a Microwave
Crispy fried fish needs dry heat to stay crispy. An air fryer works by blasting direct, hot air across the surface of the food, which re-crisps the breading without adding moisture. A microwave does the opposite: it heats food by exciting water molecules, which generates steam. That steam penetrates the breading, softens the crust, and leaves you with a rubbery texture and a stronger fishy taste. The oven also uses dry heat, but it takes 15 to 20 minutes compared to the air fryer’s 4 to 5.
Step-by-Step Reheating Instructions
Start by pulling your fish out of the refrigerator about 10 minutes before reheating. Letting it lose some of its chill helps it heat more evenly so the outside doesn’t overcook while the center is still cold.
Preheat your air fryer to 350°F for 2 to 3 minutes. This ensures the fish hits hot, circulating air the moment it goes in, which is what brings the crunch back. A light spritz of cooking oil on the breading before reheating can help it crisp up even more, but it’s optional.
Place the fish in the basket in a single layer with space between each piece. Don’t let them touch or overlap. Hot air needs to reach every surface of the breading. If you crowd the basket, the trapped moisture between pieces creates steam, which is exactly what you’re trying to avoid. If you have more fish than fits in one layer, reheat in batches.
Heat for 3 to 5 minutes, flipping the pieces halfway through. Thinner fillets like catfish or tilapia will be ready closer to 3 minutes. Thicker pieces like cod or haddock may need the full 5. You’re looking for the breading to turn golden and audibly crispy again.
Getting the Temperature Right
The USDA recommends reheating all leftovers to an internal temperature of 165°F. For previously cooked fish, many cooks pull it at around 145°F, which is enough to heat it through without drying it out. If you have an instant-read thermometer, check the thickest part of the fillet. If you don’t, the fish should be hot all the way through when you break it open, not just warm on the surface.
The biggest risk with reheating fish isn’t undercooking. It’s overcooking. Fish dries out fast, especially thinner fillets. Checking at the 3-minute mark prevents you from crossing the line between perfectly reheated and chalky.
Adjustments for Different Types of Fried Fish
Beer-battered fish (like fish and chips) tends to reheat well because the thick batter holds up to the hot air. Give these pieces the full 4 to 5 minutes and flip once. The batter should puff back up slightly and turn golden.
Lightly breaded fish, like pan-fried fillets with a thin flour or cornmeal coating, needs a gentler touch. Drop the temperature to 325°F and check at 3 minutes. The thinner coating burns more easily, and the fish beneath it dries out faster.
Fish sticks and frozen breaded fish portions work at the standard 350°F. Space them out so they aren’t touching. Three to four minutes with a flip is usually enough.
Common Mistakes That Ruin the Results
Overcrowding is the most common problem. When pieces are stacked or pressed together, the air fryer essentially steams them instead of crisping them. Even if it means running two batches, keeping a single layer with breathing room between pieces is worth the extra few minutes.
Skipping the preheat is another frequent mistake. Putting fish into a cold air fryer means it sits in slowly warming air, which draws out moisture from the breading before the temperature is high enough to crisp it. Always let the air fryer come to temperature first.
Reheating straight from the fridge without resting is less critical but still makes a difference. A cold center means the outside has to cook longer to heat the middle through, which dries out the edges. Even 10 minutes on the counter helps.
Storing Fried Fish for the Best Reheat
How you store the fish matters almost as much as how you reheat it. Wrapping fried fish tightly in foil or plastic traps moisture against the breading, which starts breaking it down before you even get to reheating. Instead, place cooled pieces in a single layer in an airtight container with a paper towel underneath to absorb excess moisture. This keeps the breading as dry as possible in the fridge.
Leftover fried fish keeps well for 3 to 4 days refrigerated. If you’re freezing it, spread the pieces on a baking sheet to freeze individually before transferring to a freezer bag. This prevents them from sticking together. Frozen fried fish can go directly into the air fryer at 350°F, but add 2 to 3 extra minutes to the reheating time and still flip halfway through.