SIXT UK Reviews 

We had to queue for 30 mins to return the vehicle at Lisbon Airport. This was not down to Sixt but all of the rental companies. All of the customers from each rental company were being told to leave the keys in the vehicles and staff were moving them as spaces became available. The whole process was chaotic.
I made sure that I had re fuelled the vehicle just prior to returning as my policy dictated.
On returning home, I am now being charged for only returning the vehicle with 3/8 of a tank of fuel and re fuelling costs.
This is totally unacceptable, I have told Sixt I have a receipt for the fuel but they do not seem to accept this. The receipt will show where I refuelled as well.
I would like to see proof, ie. a photograph of the fuel gauge and when it was taken from Sixt. This obviously won't be available as it was full on drop off.

Stay Away, I booked a category and was given a different category. Car was not clean.
Branch wouldn't reply, only when you fill a survey they would reply and nothing happens. Was promised a discount voucher that was never sent, even after the duration they claim. Again contacted customer service, who said they will let the branch know, and guess what? also the branch didn't respond.
Basically, once you have a problem with them, they will never try and bother to solve it.
Also, was funny when I asked Customer Service why it takes 20 working days to approve a voucher and they used the term "the higher ups need to approve it"! What a joke company!

Do not use, absolute scam. Returned car, documents signed to say no damage etc… it has been over 21 days and my deposit has not been returned. I have used many other car rental services in the past and never had a problem.

I recommend people use an alternative.

I use Sixt regularly globally, but mostly in the UK and I absolutely love the service, the staff, the ease of pickup, selection of cars available. I even cancelled my Enterprise Car membership (as they're so atrocious) and just use Sixt for both short and long term rentals now.

I didn't have to wait too long to pick the car up. I was pleased with the car I was given. It worked without any trouble and dropping it off was easy and quick.

Easy to book, car type identified, available on pick up, a friendly and helpful approach to the pick up process with helpful and practical guidance on sat nav etc.

I have been renting cars for years, but I think this may have been the first time with SIXT. The reason was that they were the only one offering a one off drive from Portugal to Germany. I only have good feedback for how my booking was handled by the Lisbon Airport Portuguese agent, Martin. Brand new car, an amazing VW Passat latest model, which saved my life 3 times during the 2500KM trip.
The only reason I am giving 4 stars (even though I can understand the reasons as they were explained) is the one off fee (quite high) as I dropped off the car in a different location (country).

I had a very disappointing experience with this car rental company. After returning the vehicle, they claimed there was trim damages on all four trims that we are confident did not occur during our rental. The process felt unfair and poorly handled, with little effort made to properly investigate our concerns.

Overall, we were not happy with their service and would not recommend this company based on our experience.

Great cars and always good customer service. Online check-in now provides a rapid key pick up service.

Booking made in Sydney Australia. Confirmed email stating pick up car at George Best City Airport. April 30. 2026.
Your representative called out to us as we approached the counter. I am not giving you the car as you are to old at 76.
He didn’t want to see my International Drivers document or my letter from my Dr.
He cancelled booking immediately. Sent us next door to Budget/Avis.
We got a car from them and they made my husband sign a waiver of damage form.
It was also £100 dearer.
We drove to our hotel and left the car parked for 3 nights in car park as we were too frightened to drive it.
This was a final homecoming for my husband as we had planned to visit memories and family.
This is Blatant discrimination.
Why was the booking taken in the first place.
My husband obtained his first driving licence February 1977 in Northern Ireland where he was born.

Ordered a Cupra Formentor “or similar” from Cologne Sixt. When I arrived, I was told all they had was a VW Taigo. Sixt tried to tell me this classed as “or similar”. This is of course a much smaller, compact SUV, as opposed to a premium intermediate SUV - and retails at about 60% of the price of the Cupra and has much less power. After some argument, Sixt agreed to “upgrade” me to a BMW 1 series - still a smaller and cheaper class of car - but I grudgingly accepted due to no alternative and needing to get going on my trip. Won’t be using Sixt again after this experience. Very disappointing and dishonest behaviour. Not recommended.

I have never made a formal complaint about any company in my life, which should demonstrate just how appalled I am by this experience.

The customer service I received was completely unacceptable from start to finish. I reserved a specific vehicle category, yet when I arrived there was no sign of the vehicle I had booked or any of a lower category than we received. Despite being told repeatedly that I was receiving a “free upgrade” because I had booked online, I was later charged €100 for that upgrade, despite the car we hired only being €73. 

The most frustrating aspect is that this was not mentioned once or twice—it was stated numerous times during the collection process. We were specifically told to ignore the charge displayed on the iPad and were reassured that the upgrade was free. Had we been told there would be a €100 charge, we would never have accepted it. In fact, we would have preferred the lower-category manual vehicle that we originally requested.

What makes this even more confusing is that we saw another customer before us receive an upgrade and be clearly informed of the additional cost. In contrast, we were repeatedly told our upgrade was free, with the only mention of a charge being on the contract, which we were specifically told to ignore as it was simply part of the process for recording which vehicle was leaving.

The company’s response has been to hide behind a signed contract while completely ignoring the circumstances under which that contract was presented. Customers are expected to trust the information being given to them by staff at the counter. If customers cannot rely on verbal explanations and assurances from employees, then the entire collection process becomes meaningless.

What makes this even worse is the complete refusal to acknowledge any possibility that misinformation was provided. Rather than conducting a meaningful investigation, the company has repeatedly responded with the same generic statements, effectively calling us liars while providing no evidence whatsoever to support their position.

I am genuinely shocked by the way this complaint has been handled. The lack of accountability, poor communication, and apparent willingness to charge customers for a supposedly “free” upgrade has completely destroyed my confidence in this company.

The experience felt less like customer service and more like being pressured into paying for something we neither requested nor wanted. The fact that I am still having to argue over a charge that was explicitly described as free is astonishing.

This has been, without question, the worst customer service experience I have ever encountered. I would strongly advise anyone renting from this company to scrutinise every charge, question every verbal assurance, and be extremely cautious before signing anything, regardless of what staff tell you at the counter.

Georgina at Sixt in Costs Adeje was very friendly, helpful and efficient. Everything was explained very clearly.

Do not use this company. It is a scam. Got charged an ‘out-of-hours’ fee. My receipt shows 6.02pm and the branch closes at 6pm. I waited for 10 mins for them to finish with the customer in front of me. This feels like a them problem and not one I should be charged for.

Had to be one star.
Can’t give zero.

I’ll do a review soon.

There seems to be no complaints procedure for SIXT UK.

How telling!
Peter Schofield

I originally wrote a glowing review on the SIXT website, however a week later I received an unexpected charge on my credit card. I have sent two emails asking what this charge is for and have had no reply.
We booked through SIXT so that we didn’t get unexpected charges, never again.

Second time renting from Sixt, price was good and they gave us a free upgrade which has actually gained our loyalty. Will be using Sixt for all future rentals. The app was super easy to use and no waiting in long ques like many competitors we seen. All verified via the app and the straight to the car where we were met by a lovely gentleman who gave us the keys and off we went. Return also super easy, scan the car through the machine , email within minutes confirming no change to vehicle condition and off we went. Honestly Sixt are way ahead of competitors with technology and service.

I booked a car with SIXT two months in advance and was informed only two hours before my flight that the vehicle was no longer available.
While I understand that unexpected issues can happen, what shocked me was the complete lack of customer support. During the phone call, I was told I could get a car from Avis under the same conditions, but no confirmation, voucher, email, or written instructions were provided. I specifically requested an email because I was travelling to Bristol, a city I had never visited before, and without a car I could not even reach my accommodation.
When I contacted customer support, they repeatedly replied about the refund process, explaining that the money would be returned in 15 days. This had nothing to do with my request. I pointed this out multiple times, but the only response I received was that they had nothing else to add.
Cancelling a reservation at the last minute is already a serious inconvenience. Failing to provide any meaningful assistance, alternative solution, or written confirmation is simply unacceptable.
Very disappointing experience.

If I could give zero i would. I still have had no resolution in regards to conflicting procedures. One procedure is. Not adhered to when they take the booking. So, then told by another person, another policy is they cant change driver. So. When booking, why wasn't it rejected when clearly the credit card was in my name, I can't change to my name. My spouse was going to be the main driver, but had a sudden, urgent operation on his wrist. So I started making enquiries to put me as driver. No one is getting back to me with same answer. The return to emails go to different people all the time, so no way of getting same response. One person says yes, our policy is driver has to be person who pays for car, can you send name and number, i do that, then reply is, sorry our policy is can't change driver. I hire cars for 1 week, 2 weeks, and sometimes even longer while overseas. This has made me realise, that Sixt UK definitely can't be relied upon or be trusted to even follow what they say is there procedures. They have procedures/policies that they twist so they get the benefit. If I cancel, I have a hugh fee taken and probably wait 3 months to get balance of what i already paid in full, months beforehand. However, they will never have my business again. Use someone else, absolutely frustrating and I am still waiting. They twist their conflicting policies to suit their own coffers.