Transportation

Public Transport

The Rhein-Main-Verkehrsverbund (RMV) is the public transport agency of the Rhine-Main area. In addition to Frankfurt, it also includes the neighboring cities of Offenbach, Darmstadt, Mainz and Wiesbaden. Tickets are available at the vending machines at the stations, in the buses from the driver or via the app as a mobile phone ticket. The tickets are valid from the moment of purchase, so they do not have to be stamped.
Site: www.rmv.de

Day tickets (Tageskarte)
in the price level 3 (Frankfurt) for 5,35 €; they are valid from purchase until 5 o'clock the next day
or as a group card (Gruppentageskarte) for up to 5 people for € 11.30

Mobile phone ticket
To do this, you'll have do download the RMV app from the App Store of your choice. It might only be available in the German store though.

Timetables
The easiest way is through the RMV app, downloaded from the App Store of your choice. If that isn't available, try to download the "DB Navigator" instead.
At the RMV-Homepage (www.rmv.de) look for "Fahrplanauskunft" (Routes - Enquiry) - you can change the language in the upper part of the site.

Night lines
Night buses go from about 0:50 to 4:00 o'clock from the station "Konstablerwache".

On Friday and Saturday nights most "S-Bahn" go every hour as well, but better inform yourself in advance!
More Information: https://www.rmv.de/c/en/fahrgastinfos/rmv-fuer-alle-lebenslagen/nachtschwaermer/

Bicycle

Deutsche Bahn makes bicycles available for hire through their Call a Bike service. The bicycles are stationed all over the city, including at selected railway stations. They can easily be spotted because of their eye-catching silver-red colour. To rent a specific bike, riders either call a service number to get an unlock code or reserve the bike via the smartphone application. To return the bike, the rider locks it within a designated return area (and calls the service number, if not booked via the app).
Call a Bike (DB): https://www.callabike-interaktiv.de/de/staedte/frankfurt

Nextbike also makes bicycles available for hire in Frankfurt. They are stationed all over the city. These can be spotted with their blue color scheme.
Nextbike: https://www.nextbike.de/de/frankfurt/

Cycle rickshaws (velotaxis), a type of tricycle designed to carry passengers in addition to the driver, are also available. These are allowed to operate in pedestrian-only areas and are therefore practical for sightseeing.

Frankfurt has a network of cycle routes. Many long-distance bike routes into the city have cycle tracks that are separate from motor vehicle traffic. A number of roads in the city centre are "bicycle streets" where the cyclist has the right of way and where motorised vehicles are only allowed access if they do not disrupt the cycle users. In addition, cyclists are allowed to ride many cramped one-way streets in both directions.

Local providers

Airport

The fastest way to get from the airport to Frankfurt city center (station "Hauptwache") is to take the S-Bahn lines S8 or S9 (direction "Hanau") from the airport regional train station, which takes about 15 minutes. Tickets are available at the ticket machine!