In most cases, the availability of seaports is declared through availability isochrones based on the distance determined by the beeline, what is a very simplifi ed manner of determining the availability of seaports and presenting their benefi ts to customers. Therefore, the paper aimed to determine the availability of selected seaports in Europe on the basis of the proposed methodology using a professional route planner for road freight and distance directory managed by UIC (International Union Railways) for rail freight. The intermodal transport terminal in Žilina, Slovakia and eight seaports from seven European countries were selected to verify the proposed methodology for the assessment of time availability. Time availability is one of the key factors in the choice of mode of transport by carriers and also for the use of seaports. The scientifi c benefi ts are in the design of the methodology and its application to real conditions with the evaluation of outputs for the individual transport route. The contribution also assessed the impact of other factors aff ecting the observance of planned transport times in rail and road freight transport. Sažetak U većini slučajeva raspoloživost morskih luka objavljuje se s pomoću izokrona raspoloživosti koji se temelje na udaljenosti prema najkraćoj putanji, a to je pojednostavljen način određivanja raspoloživosti morskih luka i prezentiranja njihovih prednosti klijentima. Stoga je cilj ovoga rada bio utvrditi raspoloživost odabranih morskih luka u Europi na osnovi predložene metodologije uporabom profesionalnog planera rute za cestovni prijevoz i priručnik s izračunatim udaljenostima koji vodi UIC (Međunarodna željeznička unija). Intermodalni prijevozni terminal u Žilini (Slovačka) i osam morskih luka u sedam europskih država odabran je kako bi se provjerila predložena metodologija za utvrđivanje vremenske raspoloživosti. Vremenska raspoloživost jedan je od ključnih čimbenika u odabiru načina prijevoza od strane prijevoznika te za odabir morske luke. Znanstveni doprinos rada očituje se u izradi metodologije i njezinoj primjeni u stvarnim uvjetima, uz procjenu učinaka za pojedinu transportnu rutu. Doprinos također predstavlja procjena utjecaja drugih čimbenika koji utječu na praćenje planiranog vremena za željeznički ili cestovni prijevoz.