Air fryer cooking guide
Air Fryer Sweet Potato
How long to cook sweet potato in an air fryer — times for fries, cubes and whole baked sweet potatoes, plus the temperature for caramelised, fluffy results.
200°C / 392°F
15–45 min
How long to cook sweet potato in an air fryer?
Air fry sweet potato fries at 200°C (400°F) for 15–18 minutes, shaking halfway. Cubes take 12–15 minutes. A whole sweet potato bakes at 200°C for 35–45 minutes, until a knife slides in easily.
Sweet potato is made for the air fryer — the dry, circulating heat caramelises its natural sugars into crisp, sticky edges that the oven can't match. Fries, cubes or a fluffy whole baked potato, it's one of the most rewarding things you can cook.
Time & temperature chart
| Size / cut | Temp | Time | Tip |
|---|---|---|---|
| Fries (1 cm batons) | 200°C | 15–18 min | Shake twice |
| Cubes (2 cm) | 200°C | 12–15 min | Shake at 7 min |
| Whole, medium (250 g) | 200°C | 35–40 min | Pierce first |
| Whole, large (400 g) | 200°C | 40–45 min | Turn once |
Times are a guide — air fryers vary by 10–20%. Always cook to the safe internal temperature, not just the timer.
How to air fry sweet potato
- 1
For fries or cubes, peel (optional) and cut into even pieces so they cook at the same rate.
- 2
Toss with 1 tablespoon of oil, salt and a pinch of paprika or cinnamon.
- 3
For a whole sweet potato, prick all over with a fork and rub with a little oil.
- 4
Preheat the air fryer to 200°C (400°F) for 3 minutes.
- 5
Cook in a single layer, shaking fries and cubes halfway; turn whole potatoes once.
- 6
They're done when caramelised and tender — a whole potato should give easily when squeezed.
Pro tips
- Sweet potato has more sugar than regular spuds, so it browns faster — watch the last few minutes.
- A 20-minute cold-water soak makes the fries crisp up better; dry them well first.
- For extra-crispy fries, toss with a teaspoon of cornflour along with the oil.
Frequently asked questions
What temperature for sweet potato in an air fryer?
200°C (400°F) for fries, cubes and whole potatoes alike — hot enough to caramelise the natural sugars and crisp the surface.
How long do sweet potato fries take in an air fryer?
About 15–18 minutes at 200°C, shaking the basket a couple of times. Cut them evenly and don't overcrowd for the crispiest results.
How long does a whole sweet potato take in the air fryer?
A medium sweet potato takes 35–40 minutes at 200°C; a large one 40–45. Pierce it first and check it's soft all the way through before serving.
Do you need to soak sweet potato fries?
It's optional but helps. A short soak in cold water removes surface starch so the fries crisp up rather than steaming.
Sweet potato recipes to try
SnacksPerfect Air Fryer French Fries
Golden, fluffy-inside fries from scratch with a fraction of the oil. The cold-water soak makes them shatteringly crisp.
VegetablesGolden Halloumi & Courgette Air-Fryer Flatbread Pockets
Warm pita pockets filled with air-fried courgette and golden halloumi, finished with crunchy summer salad and a cool mint yogurt sauce.
VegetablesCrispy Balsamic Air Fryer Brussels Sprouts
Caramelised, lacy-edged Brussels sprouts with a sweet balsamic finish. The vegetable side that disappears first.