Self-drive and driver-included rentals each make sense on different Kerala roads, and the choice usually comes down to which stretch of coast or backwater you are covering.
Self-drive rentals are easy to arrange in Thiruvananthapuram and Kochi, less so in Kollam or Thrissur, where the agencies are thinner and the vehicles older. A compact hatchback suits the coastal NH 66 run between Kovalam, Varkala and Kollam; anything wider becomes a nuisance on the Varkala Cliff access lane and the back streets behind Thiruvananthapuram's Chalai market. Expect a refundable deposit and a fuel-in-full policy, and check whether the quoted rate includes the Kerala road tax sticker, because that is where the cheap online prices quietly stop being cheap.
An international driving permit plus your home licence is what the rental desks ask for, and most will not release a car without a photocopy of your passport. Traffic is slow rather than hostile: the worst you will meet is a lorry overtaking on a blind bend near Kayamkulam. If you are only in Kerala for four or five days and your itinerary is Thiruvananthapuram to Alleppey, self-drive works well. If you are doing the hill stations, skip it.
The Western Ghats change the calculation. The road up to Munnar from Muvattupuzha is a sequence of hairpins with buses coming the other way, and the same applies on the Thekkady side and the climb to Wayanad through Thamarassery Churam. A driver who does that route weekly is worth every rupee of the daily rate, which is typically quoted per 300 kilometres with a fuel and driver allowance on top. Ask whether the allowance covers the driver's own food and overnight stay, because on multi-day hill routes it usually does not unless you agree it upfront.
A driver also solves the parking problem in Kochi's Fort Kochi and Mattancherry, where the lanes are narrow and the car parks fill by mid-morning. The trade-off is flexibility: a driver-included car is yours for the day, not the hour, so a spontaneous stop at a roadside toddy shop or the Cherai beach turn-off needs a little negotiation. For a family of four with luggage doing Kochi, Munnar and Thekkady in a week, I would book the driver. It removes the single most stressful part of a Kerala road trip.
Both options swing with the season. December to February is peak, when rates rise and the good drivers are booked out weeks ahead; the monsoon months of June to August bring rates down but also bring standing water on the low-lying stretches of NH 66 near Alappuzha and the Kuttanad polders. Self-drive is cheaper on paper for short city-based stays in Thiruvananthapuram or Thrissur, where you are doing 40 to 60 kilometres a day. Once you pass roughly 200 kilometres a day across three or more days, the two converge and the driver's local knowledge starts winning.
One caution on self-drive: the big rental brands at Kochi and Trivandrum airports are reliable, but the small operators advertising on the roadside do not always carry proper insurance. Confirm the policy in writing and photograph the car before you leave the lot. In Thiruvananthapuram, a car is genuinely more trouble than it is worth inside the city; park at your hotel in Vazhuthacaud or near the museum and take autos. That is where I would spend the saved money: a better hotel room, not a bigger car.
Some stretches reward a self-drive car. The Varkala to Kollam coast road, the quiet back lanes around Munroe Island, and the Munnar to Kumily tea-country route on a clear morning are all pleasant at your own pace, and you will want to stop every ten minutes. The Bekal and Kasaragod stretch in the far north is the most under-driven part of the state and the roads are wide and light. If your trip is a slow coastal one, self-drive gives you the freedom that a fixed driver itinerary cannot match.
For anything combining coast and hills, or for anyone arriving jet-lagged into Thiruvananthapuram at 3am, hire the driver. Book your hotels before you book the car, because the vehicle type depends on your route, not the other way round. A week split between a Fort Kochi heritage stay, two nights in Munnar and a houseboat at Alleppey is the classic first trip, and that itinerary is far better with someone else at the wheel. Decide the hotels, then match the transport to them.
Do I need an international driving permit for a self-drive rental in Kerala?
Yes, rental agencies in Thiruvananthapuram and Kochi normally require an IDP alongside your home licence, plus your passport. Carry the originals, not photographs, and check the requirement with the agency before you book.
Is it safe to drive in Kerala at night?
Best avoided on unlit rural roads where cyclists and pedestrians share the lane. On NH 66 between major towns it is manageable but tiring. Most self-drive travellers plan to be at their hotel before dusk, and a hired driver removes the issue entirely.
Which is better for a Munnar and Thekkady trip?
Hiring a driver. The ghat roads are steep, narrow and busy, and local drivers know the passing places and the timing. Self-drive adds real stress on those climbs, especially in rain or after dark, for little saving once you factor in the daily rate.