Healthy Dinners

Salmon in the Air Fryer with Asparagus (25 Minutes)

Salmon fillets air fried at 400°F until they flake, with crisp-tender asparagus and a 2-minute lemon garlic butter. 37 g of protein per serving, on the table in 25 minutes.

By Ljube Saragjinov · November 10, 2026 · Total 25 mins

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Overhead plate of lightly golden peppered salmon fillets with bright green asparagus and cheesy potato stacks with parsley — Photo: Showmeyourflowers / Pixabay (Pixabay Content License)

Salmon that's lightly golden on the outside and still juicy in the middle, with a side of asparagus that cooks in the same basket. It takes 8 minutes of prep and about 17 minutes in the air fryer, and you only wash one basket and a small bowl.

This version works because of a few small things: fillets of even thickness, a hot preheated basket, and salt that goes on 10 minutes before cooking. You add the lemon garlic butter at the end, not before, so it doesn't burn or smoke in the drawer.

Why this recipe works

An air fryer is a small convection oven with a strong fan. At 400°F that moving air browns the top of the salmon in the time it takes the center to cook through, so you get color without the splatter you'd get from a skillet.

The most important detail is thickness. A 1-inch fillet takes 7 to 9 minutes. A thin tail piece is done in 5 and turns dry if it stays in for 9. If you buy fillets that are all about the same thickness (or fold the thin tail under itself), they all finish at the same time.

Salting 10 minutes ahead seasons the fish and firms up the surface. That cuts down on the white albumin that seeps out of salmon when it cooks fast. Cooking the asparagus first, then the salmon, gives each one the whole basket, so nothing steams.

Ingredient notes

Salmon: buy center-cut fillets, 5 to 6 oz each and about 1 inch thick. Farmed Atlantic salmon is fattier and stays moist even if you cook it a minute too long. Wild sockeye or coho is leaner and usually thinner, so start checking it 2 minutes earlier.

Skin-on or skinless: either works. Skin-on fillets go skin side down and hold together better when you lift them out. If you like crisp skin, pat it very dry and oil it, though it won't get as crisp as it does in a hot pan.

Salt: the amounts are for Diamond Crystal kosher salt. If you use Morton kosher or table salt, use about half as much.

Asparagus: medium spears, about the thickness of a pencil, cook in 5 to 6 minutes. Pencil-thin spears need 4. Thick ones need 7 to 8.

Lemon: use both the zest and the juice. The zest goes on the fish before cooking and gives you lemon flavor without the acid. The juice goes in the butter at the end.

How to make salmon in the air fryer

Take the salmon out of the fridge, pat it dry, and season it with salt, pepper, garlic powder and lemon zest. While it sits, preheat the air fryer to 400°F and toss the asparagus with oil and salt.

The asparagus goes in first, in a single layer. Shake the basket once. It's ready when the spears are bright green and the tips have just started to brown. Move them to a platter and cover loosely with foil.

Brush the salmon with oil and lay it in the hot basket with space between the fillets. Don't flip it. Start checking at 7 minutes: the top should be lightly golden, the sides opaque, and the thickest part should flake when you press it with a fork. An instant-read thermometer should read 145°F in the thickest part (the USDA safe temperature for fish).

While the salmon cooks, melt the butter with grated garlic and stir in lemon juice and parsley. Spoon it over the fish and asparagus as soon as they come out.

Common mistakes (and how to fix them)

Dry salmon: this nearly always means overcooking or a thin fillet. Check 2 minutes before you think it's done, and fold thin tail ends under so the fillet is an even thickness. If one fillet is thicker, put it in 1 to 2 minutes before the others.

Salmon stuck to the basket: oil the fish rather than the basket, and make sure the basket is fully preheated. A perforated parchment liner also works. Never put an empty liner in while preheating, because the fan can blow it into the heating element.

White stuff on top: that's albumin, a harmless protein. Salting ahead and avoiding overcooking keep it to a minimum.

Smoke from the air fryer: fat dripping onto a hot drawer causes it. Don't add butter before cooking, and wipe out any old grease. If it still smokes, pour 2 tablespoons of water into the drawer under the basket.

Limp or burnt asparagus: if the spears are piled up they steam and go limp. If the tips are dry or scorched, the spears were too thin for that time. Cook in one layer and match the time to their thickness.

What to serve with salmon in the air fryer

Crispy potatoes go well with the lemon butter. Try Parmesan potato stacks, or halved baby potatoes air fried at 400°F for 15 to 18 minutes before you start the asparagus.

For a lighter plate, serve it with lemon herb quinoa or a cucumber and dill salad with plain yogurt. Garlic rice or buttered orzo turns it into a heartier dinner and catches the extra butter.

Tips for success

If your air fryer only fits 2 fillets with space between them, cook in 2 batches. The second batch is often 1 minute faster because the basket is already hot.
Buy one 1 1/2 lb center-cut piece and cut it into 4 portions yourself. Every piece will be the same thickness.
Basket models run hotter than oven-style air fryers. If you're using an oven-style one, add 1 to 2 minutes.
Carryover heat adds a few degrees as the fish rests, so check early and take it out as soon as it flakes.

Substitutions

Dairy-free: use 2 tbsp olive oil instead of butter in the lemon garlic sauce. You lose some richness but none of the brightness.
Different fish: steelhead trout cooks the same way but is thinner, so give it 6 to 7 minutes. Cod or halibut works at 400°F for 8 to 10 minutes and needs the oil brushed on generously because it's leaner.
Fresh garlic for garlic powder: don't do it on the fish, because small pieces of fresh garlic burn at 400°F. Keep the fresh garlic in the butter.
Green beans for asparagus: trim them and air fry at 400°F for 7 to 8 minutes, shaking halfway.
Seasoning swap: replace the garlic powder and zest with 1 tsp smoked paprika and 1/2 tsp ground cumin, then finish with lime instead of lemon.

Storage and reheating

Refrigerate leftovers in an airtight container within 2 hours of cooking and eat them within 3 to 4 days. To freeze, wrap the cooked fillets tightly and freeze for up to 3 months (it's still safe after that, but the texture suffers). Thaw overnight in the fridge. Reheat in the air fryer at 325°F for 4 to 5 minutes, covered loosely with foil so it doesn't dry out, until it reaches 165°F. Cold leftover salmon is also good flaked into salads or grain bowls. Asparagus gets soft when reheated, so it's better eaten cold or chopped into eggs.

Make ahead

Mix the salt, pepper, garlic powder and lemon zest up to a week ahead and keep it in a jar. Trim the asparagus up to 2 days ahead and store it wrapped in a damp paper towel in the fridge. The lemon garlic butter keeps for 3 days in the fridge; just melt it before serving. Season the salmon no more than 30 minutes before cooking, because salt left on longer starts to cure the surface.

Salmon in the Air Fryer: Dinner in 25 Minutes — Save to Pinterest

Frequently asked questions

How long do you cook salmon in the air fryer at 400°F?

7 to 9 minutes for 1-inch-thick fillets, 5 to 6 minutes for 3/4-inch fillets. There's no need to flip it. It's done when the thickest part flakes easily and reads 145°F.

Can you cook frozen salmon in the air fryer?

Yes. Rinse off any ice glaze, pat it dry, and air fry at 400°F for 5 minutes. Then brush it with oil, season it, and cook another 6 to 9 minutes until it reaches 145°F in the center. The seasoning sticks better once the outside has thawed.

Do you need to flip salmon in the air fryer?

No. The hot air reaches the top, and the basket lets heat in underneath. Flipping is likely to break the fillet, especially with skinless salmon.

Should salmon go skin side up or down in the air fryer?

Skin side down. The skin protects the bottom from drying out and makes the fillet easier to lift out. If you don't want to eat the skin, slide a spatula between the skin and the flesh after cooking and it comes away cleanly.

Can I use parchment paper in the air fryer for salmon?

Yes, use a perforated liner so air can still move under the fish. Only put it in with the salmon on top, never empty during preheating.

Recipes on Dinner Ideas Weekly are for general information. Nutrition values are estimates; check labels for allergens and cook meat, poultry and eggs to safe internal temperatures.

Ljube Saragjinov

Ljube Saragjinov is a food enthusiast from Macedonia and the founder of Dinner Ideas Weekly and DietAI.mk, sharing simple, safe dinners made with everyday groceries.