How long to cook sweet potato in an air fryer

At-a-glance cooking parameters

Temperature

380 °F

193 °C

Total time

40 min

per single layer

Flip at

20 min

flip once

Internal temp

—

use visual cue

A pair of 8-oz sweet potatoes bake whole in 40 minutes at 380 °F (193 °C) with one flip at 20 — the convection air crisps the skin into a salt-crusted crackling shell while the flesh inside steams to a soft, sweet, caramelised mash that needs nothing more than butter and salt. The cook is the closest the home kitchen gets to a roadside-roasted sweet potato: bare skin, no foil, rubbed with oil and salt before loading, pierced for steam escape. Pull when a knife slides through with no resistance and syrup is caramelising at any cracks. Split open the moment they come out so the steam escapes — flesh left in a closed tuber goes gummy as the residual moisture condenses back in.

Per serving

Approximate values for a single portion of sweet potato (USDA baseline, cooked, includes light air-fryer oil spray).

Calories

180 kcal

Protein

4 g

Fat

1 g

Carbs

41 g

Sweet Potato in popular air fryer brands

Adjusted for how each brand actually heats. Tap a brand name to see every food we calibrate for it.

How to tell it’s done

A paring knife sinks through the centre with no resistance from any angle — top, side, ends — not just 'mostly through' but cleanly through with the same easy slide as cutting butter. The skin has shrunk and wrinkled into the shape of the tuber, sugars caramelising into amber syrup at any natural cracks or fork-pierce holes, and the whole potato gives easily when gently squeezed through an oven mitt. A tuber that still resists the knife at 40 minutes needs another 5; one that sags and weeps syrup all over the basket is ready and should be pulled before the skin starts to burn.

Step-by-step method

1. 1

   Prep

   Bring ingredients close to room temperature. Rub the whole skin with 1 teaspoon olive oil and a generous pinch of flaky salt per tuber — the oil-and-salt rub is the whole technique for the crisp skin. Skipping this leaves the skin leathery instead of crackling-crisp.

2. 2

   Season

   Season with flaky sea salt (in the oil rub, before cooking), black pepper after splitting, butter or olive oil after splitting, ground cinnamon (sweet finish), cumin + chili powder (savoury finish), tahini drizzle, maple syrup or brown sugar (sweet finish), fresh chopped chives or parsley.

3. 3

   Load

   Arrange 2 medium sweet potatoes (about 8 oz each, matched within an ounce so they finish together), scrubbed, in a single layer for best convection airflow.

4. 4

   Cook

   Set the air fryer to 380 °F (193 °C) and cook for 40 minutes total, flipping once at 20 minutes.

5. 5

   Check & rest

   Check the visual doneness cue and serve immediately for best texture.

6. 6

   Store

   Refrigerate whole or split up to 5 days in an airtight container. Reheat at 380 °F for 5–6 minutes in the air fryer to re-crisp the skin — microwaving makes the skin soggy. Mashed leftover flesh keeps an extra day; freeze the flesh (not the skin) up to 2 months for soups and pies.

Watch out for

• !Pierce each tuber 4–6 times with a fork before loading. A whole intact sweet potato traps steam under high heat and can rupture loudly — the fork holes give the steam an escape path while the skin still crisps.
• !Do NOT wrap in foil. Foil blocks the convection air that is the entire point of air-frying over oven-baking — the cook reverts to a slow steam-bake under foil and you've defeated the time saving. Bare-skin loading is non-negotiable.
• !Match tuber size within an ounce or two in a batch. A 12-oz tuber loaded alongside two 6-oz tubers will still be undercooked when the smaller ones have over-caramelised and started to scorch — sort by weight on the kitchen scale before loading, or cook large and small batches separately.
• !Don't skip the oil-and-salt rub on the skin. The skin is the best part once crisped (crackling-thin, salty, deeply flavoured) but bare unsalted skin steams to a leathery chew instead of crisping. One teaspoon of oil and a pinch of salt per tuber, rubbed all over before loading, is the difference between a sweet potato that gets eaten skin-and-all and one where the skin gets discarded.

FAQ about sweet potato in an air fryer

What temperature should I cook sweet potato at in an air fryer?

Cook sweet potato at 380 °F (193 °C). The convection air at this temperature cooks the centre evenly while still browning the surface.

How long does sweet potato take in an air fryer?

Sweet potato takes 40 minutes total at 380 °F (193 °C). Flip the food once at 20 minutes so both sides cook evenly.

Do you need to flip sweet potato in an air fryer?

Yes — flip sweet potato once at 20 minutes. The side touching the basket grate develops a darker, more crusted surface; flipping evens out the cook so both sides match.

Do you need to preheat the air fryer for sweet potato?

Preheating is optional for sweet potato — most modern air fryers reach temperature in under 2 minutes and the food's total cook time already accounts for the ramp-up. If you do preheat, reduce the total time by 1–2 minutes and check earlier than usual.