Taxis in Łódź are generally trustworthy although you should guard against unscrupulous drivers by going for taxis which have clearly displayed prices (normally found in the rear passenger window). As a yardstick rates should be around 6zł the moment you get in and then around 2zł per kilometre. You should expect to pay approximately 50% more at night and on Sundays and public holidays. A standard day fair to/from the airport from the centre of Łódź will cost around 30-40zł.