By ship
It is possible to enter Hungary by international shipping lines on Danube Duna or Tisza rivers.There is a scheduled hydrofoil service on the Danube to and from Vienna and Bratislava between May and September operated by Mahart. (http://www.mahart.info/we...)
From Slovakia
You can use the bus no. 91 of the urban traffic company of Bratislava DPB going to Äunovo in order to cross between Rajka Hungary and Bratislava Slovakia. In Bratislava, the bus has Nový most as its terminus, and near the Hungarian border you get on/off at the stop Äunovské jazerá you need to signal to the driver if you plan to get off at this stop. From Äunovské jazerá it's a four-kilometer-long straight walk through a flat terrain to the town of Rajka, two kilometers on each side of the border. You may detour to visit a monument at the Austrian-Hungarian-Slovakian three country border.
By bus
Several international bus lines go in or through Hungary. You can find timetables and book tickets on the homepage of Volánbusz (http://www.volanbusz.hu/en/), which is the national bus company and also the local Eurolines representation.Alternatively, Orangeways bus company (http://www.orangeways.com/en) offer services on routes between Budapest and Austria, Croatia, Czech Republic, Germany, Poland, Romania and Slovakia. Timetables and online booking are available on their website. On the southern border with Serbia you shouldn't be surprised when there in the bus a collection is being held for a donation to the border-guards, to let the bus pass faster.
By plane
Hungary's main international airports are Budapest Ferihegy Airport (http://www.bud.hu/index.n...) in Budapest and Airport Debrecen (http://www.airportdebrecen.hu/) in Debrecen. In addition, there are less used international airports; these are FlyBalaton Airport (http://www.flybalaton.com...) in Sármellék non operating, GyÅr-Pér and Pécs-Pogány. The Hungarian national carrier is Malév Hungarian Airlines (http://www.malev.hu/) non operating. There are also several low cost carriers operating to Budapest: for example Ryanair (http://www.ryanair.com), Wizzair (http://www.wizzair.com), Easyjet (http://www.easyjet.com), Germanwings (http://www.germanwings.com) and Airberlin (http://www.airberlin.com).