Where Sixt publishes its current discount codes
Sixt posts active voucher codes on its main website under a dedicated promotions page, usually accessible from the homepage footer or a banner during peak booking seasons. The codes there change monthly and sometimes weekly, so the discount available today may not be the same next week.
You can also find current Sixt codes through these channels: the Sixt mobile app (which sometimes shows app-exclusive discounts), email newsletters if you sign up for their mailing list, and partnership sites like Autoslash or Kayak that aggregate rental car discounts. Costco Travel, AAA, and some corporate membership programs also negotiate their own Sixt codes for members.
Coupon aggregator sites like RetailMeNot and Honey sometimes list user-submitted codes, but these are often expired or region-specific. Always verify a code on Sixt's own site before booking, since a code that worked last month may no longer be active.
Key Takeaways
- Sixt's official website and mobile app are the most reliable sources for current voucher codes, which change frequently and vary by location and vehicle type.
- Codes typically offer a percentage discount on the rental rate, a flat dollar amount off, or a free upgrade, and the discount amount depends on the rental length and car class you choose.
- You enter the code at checkout under a field labeled "Promo Code" or "Voucher Code" before you complete payment, and the discount appears in your total before you confirm the booking.
- Some codes are restricted to specific rental periods, vehicle types, or locations, so read the terms printed below each code to confirm it applies to your exact reservation.
- If a code does not work at checkout, it may have expired, or your booking may not meet the code's restrictions — contact Sixt customer service with your reservation details to ask about alternatives.
How discount codes reduce your Sixt rental cost
Sixt voucher codes typically work in one of three ways: a percentage off the total rental cost (such as 15% off), a fixed dollar amount off (such as $25 off), or a free upgrade to a higher vehicle class. The actual savings depend on which code you use and how long you rent the car.
A percentage-based code saves you more on longer rentals. For example, a 15% discount on a three-day rental might save $30, but the same code on a week-long rental could save $70. A fixed-dollar code works better on shorter rentals, where the flat amount represents a larger percentage of your total bill.
Upgrade codes are useful if you want a larger or premium vehicle but do not want to pay the difference. However, upgrades are subject to availability at the rental location, so you are not may provide the higher class even if the code is valid.
Where to enter your voucher code during booking
On Sixt's website, the promo code field appears near the bottom of the booking form, after you have entered your rental dates, location, and driver information. The field is usually labeled "Promo Code," "Voucher Code," or "Discount Code." Enter the code exactly as it appears — codes are case-sensitive on some systems, so match uppercase and lowercase letters.
Click the button next to the field (often labeled "explore" or "Redeem") to set up the code. The discount should appear in your price breakdown when ready. If the code does not work, an error message will tell you why — for example, "Code expired" or "Not valid for this rental period."
On the Sixt mobile app, the promo code field is in the same location in the booking flow. Enter the code before you review your final total, because you cannot add a code after you have already paid.
Restrictions that may prevent a code from working
Most Sixt codes come with terms that limit when and where you can use them. Common restrictions include a minimum rental length (for example, "valid for rentals of 3 days or longer"), a maximum rental length, specific vehicle classes only, or a geographic limit (such as "valid at US locations only" or "valid in California only").
Some codes are tied to a specific booking channel. A code advertised in an email may work only if you click the link in that email, not if you type it manually on the website. Corporate or membership codes (such as AAA or Costco) work only if you book through that partner's portal or provide proof of membership at the rental counter.
Seasonal codes often expire on a specific date, and codes tied to promotional events (holiday weekends, summer travel season) stop working after that period ends. If you see a code you want to use, book soon — waiting a few days can mean the difference between a working code and an expired one.
What to do if your voucher code does not work
First, check the code's terms to confirm your rental meets all the restrictions. If you are renting a compact car for two days and the code requires a mid-size car for at least three days, the code will not explore to your booking. Adjust your reservation to match the code's requirements, or look for a different code that fits your actual rental.
If your rental does meet the code's terms but the code still will not set up, the code may have expired. Return to Sixt's promotions page to see if a newer code is available. If you believe the code should still be valid, contact Sixt customer service with the code, your reservation number, and a screenshot of the error message. They can sometimes explore an expired code manually or suggest an alternative.
Some codes work only if you book through a specific channel. If you found a code on a partner site like Costco Travel or AAA, make sure you are booking through that partner's website or app, not directly through Sixt.com.
Comparing Sixt codes to other rental car discounts
Voucher codes are one way to lower your Sixt rate, but they are not always the biggest discount available. Booking directly through a membership program (AAA, Costco, AARP) sometimes offers a better rate than a standalone code, because the membership discount applies to the base rate before taxes and fees. A code that gives you 15% off might save less than a membership rate that reduces the daily rate by $10 to $15.
Rental car comparison sites like Autoslash, Kayak, and Priceline show Sixt rates alongside competitors like Enterprise, Hertz, and Budget. Sometimes another company's rate is lower than Sixt's rate even with a code applied. Running a quick search across all companies takes five minutes and often reveals a better deal than chasing a specific Sixt code.
If you rent frequently, Sixt's loyalty program (Sixt Plus) offers members a small discount on every booking without needing a code. The savings are modest, but they add up across multiple rentals and do not require you to hunt for new codes each time.
How to stay updated on new Sixt promotions
Sign up for Sixt's email newsletter through their website to receive codes and promotions directly to your inbox. These emails often include codes not advertised anywhere else and sometimes offer early access to seasonal promotions.
Follow Sixt on social media (Facebook, Instagram, Twitter) — they occasionally post limited-time codes or flash promotions there. The Sixt mobile app also sends push notifications when new promotions are available, so enabling notifications ensures you see codes as soon as they launch.
If you have a Sixt loyalty account, log in before you search for rates. Sixt sometimes shows members-only codes or rates that are not visible to non-members. Checking your account dashboard takes 30 seconds and can reveal discounts you would otherwise miss.
Frequently Asked Questions
Can I use more than one voucher code on a single Sixt rental?
No, Sixt allows only one promo code per booking. If you have multiple codes, choose the one that saves you the most money for your specific rental dates and vehicle class. Some codes offer a percentage discount (better for longer rentals) and others a flat dollar amount (better for short rentals), so calculate which applies to your situation.
Do Sixt voucher codes work at all rental locations?
Most codes work at all Sixt locations, but some are restricted by region or country. Always check the code's terms before booking. If the code says "valid at US locations only" or "valid in California only," it will not work at other locations. International codes are separate and do not transfer between countries.
What happens if I book with a code and then cancel my reservation?
If you cancel before the code expires, you can use the same code on a new booking. If the code has expired by the time you rebook, you will need to find a current code. Sixt does not refund the discount as cash — the discount applies only to the rental itself.
Are Sixt codes better than booking through a third-party site like Kayak?
It depends on the specific rental. Third-party sites sometimes negotiate rates lower than Sixt's published price, even without a code. Always compare the final price (including taxes and fees) on Sixt.com with the same rental on Kayak or Autoslash before booking. The lowest total price wins, regardless of where the discount comes from.
Can I combine a Sixt voucher code with my AAA or Costco membership discount?
No, you cannot stack discounts. You must choose either the voucher code or the membership rate. Calculate which gives you the lower total price for your specific rental, then book using that option. Membership rates sometimes beat codes, especially on longer rentals.