We recommend you to travel by public transport means (using the combination: bus + metro + long-distance-bus). This is the cheapest way of travelling and it is also safe. Below you can read some instructions regarding the method of travelling to Dunaújváros from the airport:
FROM THE AIRPORT TO NÉPLIGET BUS STATION
The fastest and easiest way to get to Dunaújváros is by taking the bus. Buses run to Dunújváros from Budapest-NÉPLIGET BUS STATION in every hour. To get to NÉPLIGET BUS STATION from the Airport you can either take the local buses or you can take a taxi, but of course that is a much more expensive option. The bus stop is in front of the building of the arrival terminal at the airport. For taking the bus you have to buy a single ticket (its name is "BKK vonaljegy"). Please note, that this kind of ticket can be used as well for the metro and the local buses and trams within Budapest. You can purchase tickets at the airport: at the BKK Customer Service Points in the arrivals halls, at post offices and newsagents, at the ticket machine at the bus stop, or from the bus driver (surcharge). You will need two line tickets to get to bus station: one for the bus and one for the metro.
According to BKK the price of the ticket is going to be 450 HUF if you buy it in advance, while if you get it directly from the driver it is going to be 600 HUF from the 1st of September 2023.
You need one ticket for the bus „200E” - (from the airport to Népliget M station)
The bus line number „200E” will take you from the airport to KŐBÁNYA-KISPEST where metro line M3 starts. You have to use the underground until you get to NÉPLIGET BUS STATION where you can take the bus to Dunaújváros. When travelling on the “200E” bus you will see a digital display on the bus at the level of the eye, which always tells you which is the next bus stop, while on the Metro you will hear a voice doing the same.
You can check the timetable on the following website: https://bkk.hu/en/timetables/#200E
Subway trains run more frequently, usually in every five minutes.
FROM NÉPLIGET BUS STATION TO DUNAÚJVÁROS (Dózsa Mozi bus stop)
NÉPLIGET BUS STATION is one of the stations in Budapest, from where the long-distance buses start from.
Travelling by long-distance bus is the easiest; it is fast and not expensive. The bus ticket (from Budapest to Dunaújváros) costs around 1500,- HUF (approximately 4,- EUR). You can purchase a ticket from the bus driver, when you get on the bus. It takes between 70 and 100 minutes for the bus to get from Budapest to Dunaújváros. (It depends on which bus line you take, and at how many villages or towns it stops during the way). There is at least one express bus departs in every hour from NÉPLIGET to Dunaújváros. There is a bus stop in Dunaújváros, where most of the long-distance buses stop, called "DUNAÚJVÁROS DÓZSA MOZI", named after the movie theatre which is right behind the bus stop ("Mozi" = movie theater). From "DÓZSA MOZI" it takes approximately 12 minutes to walk to the campus (see it here: https://goo.gl/maps/8uJLpXsvGGZ16c1y8).
You can check the timetables of buses between Budapest and Dunaújváros on the following website: https://www.menetrendek.hu/mobile/?lng=en.
Another very helpful app is BudapestGO that is the official Trip Planner of Budapest Public Transport System. It helps you to find what means of transport do you have to use in Budapest to get from the departure place to the requested destination. The app is available for iPhones and Android devices as well.