How Long to Cook Flounder
Fresh or frozen flounder fillets, a mild, thin white fish.
The Short Answer
Fresh or frozen flounder fillets, a mild, thin white fish. Cook to an internal temperature of 145 degrees F.
Use an instant-read thermometer inserted into the thickest part.
Cooking Methods
🔥 Oven
Temperature: 400°F
Time: 10–14 minutes
Flounder is thin and cooks quickly. Brush with butter, season, and bake. Watch closely; it goes from done to overcooked in minutes.
Rest: 2 minutes
✈️ Air Fryer
Temperature: 400°F
Time: 7–10 minutes
Brush with oil or butter. Single layer. Very quick cooking due to thin fillets. Check at 7 minutes.
Rest: 2 minutes
🍳 Stovetop
Time: 3–4 minutes
Per side in a buttered skillet over medium-high heat. The thin fillets cook in minutes. Use a fish spatula to flip gently.
Rest: 2 minutes
Flounder is one of the thinnest fish fillets you can buy. It cooks in half the time of salmon or cod. Set a timer and stay nearby. Walking away for even 2-3 minutes can mean the difference between perfectly flaky and dried out.
Frequently Asked Questions
The flesh turns from translucent to opaque white and flakes easily with a fork. Due to its thinness, flounder cooks in 8-14 minutes depending on method. Check early.
Yes. It has a very mild, delicate flavor with no fishiness. However, it is thin and delicate, so handle it gently. A fish spatula is helpful for flipping without breaking.
Very mild, slightly sweet, and delicate. It is one of the mildest fish available, making it popular for people who are not typically fish fans. It takes on the flavor of whatever you season it with.
The Bottom Line
Flounder cooking times vary by method and thickness. Always verify doneness with a thermometer reading 145 degrees F. The times above are guidelines; your specific results depend on the size and starting temperature of your food.