The cost of a rental depends on a variety of factors, including the driver's age, country of residence, insurance, years of experience, length of rental, and more.
Some locations offer 24-hour car rental service in Copenhagen - airport, port. You can use the services of dozens of companies, finding which of them will offer you car rental in Copenhagen cheaply and on comfortable conditions.
The most popular companies are Sixt (it has seven pickup points, tel.+45 3248 1100) and Europcar (three pick-up points, including at airport, tel: +45 3355 9900). These companies don't offer the cheapest car rental in Copenhagen, but they always have new cars in good condition, 24-hour support and professional service.
Some hotels in Copenhagen offer no deposit car rental services, including Copenhagen Plaza (Bernstorffsgade, 4, 1577, tel: +45 33 14 92 62).
When it comes to finding the cheapest car rental options, it's best not to chase them, as most will have hidden fees and additional terms and conditions - a rule that applies not just to Copenhagen, but to any car rental shop in Europe.