Release Info
Release Dates
| Netherlands | 30 May 2009 | (premiere) (The Hague) |
| Lithuania | 2 June 2009 | |
| USA | 2 June 2009 | (premiere) (Hollywood, California) |
| Canada | 5 June 2009 | |
| USA | 5 June 2009 | |
| Iceland | 10 June 2009 | |
| Sweden | 10 June 2009 | |
| Australia | 11 June 2009 | |
| Croatia | 11 June 2009 | |
| Kazakhstan | 11 June 2009 | |
| Netherlands | 11 June 2009 | |
| New Zealand | 11 June 2009 | |
| Russia | 11 June 2009 | |
| Slovakia | 11 June 2009 | |
| Ukraine | 11 June 2009 | |
| Ireland | 12 June 2009 | |
| Latvia | 12 June 2009 | |
| Lithuania | 12 June 2009 | |
| Romania | 12 June 2009 | |
| Taiwan | 12 June 2009 | |
| UK | 12 June 2009 | |
| Belgium | 17 June 2009 | |
| Czech Republic | 18 June 2009 | |
| Hungary | 18 June 2009 | |
| Portugal | 18 June 2009 | |
| Bulgaria | 19 June 2009 | |
| Estonia | 19 June 2009 | |
| Italy | 19 June 2009 | |
| Norway | 19 June 2009 | |
| South Africa | 19 June 2009 | |
| Finland | 24 June 2009 | |
| France | 24 June 2009 | |
| Switzerland | 24 June 2009 | (French speaking region) |
| India | 26 June 2009 | |
| Turkey | 10 July 2009 | |
| Greece | 16 July 2009 | |
| Germany | 23 July 2009 | |
| Switzerland | 23 July 2009 | (German speaking region) |
| Austria | 24 July 2009 | |
| Denmark | 24 July 2009 | |
| Egypt | 29 July 2009 | |
| Hong Kong | 30 July 2009 | |
| Israel | 30 July 2009 | |
| Singapore | 30 July 2009 | |
| Thailand | 30 July 2009 | |
| Poland | 7 August 2009 | |
| Argentina | 10 August 2009 | (premiere) (Buenos Aires) |
| Philippines | 12 August 2009 | |
| Argentina | 13 August 2009 | |
| Colombia | 14 August 2009 | |
| Mexico | 14 August 2009 | |
| Panama | 14 August 2009 | |
| Spain | 14 August 2009 | |
| Uruguay | 14 August 2009 | |
| Peru | 20 August 2009 | |
| Brazil | 21 August 2009 | |
| Venezuela | 28 August 2009 | |
| Syria | 17 September 2009 | |
| Japan | 21 September 2009 | (Old Town Taito International Comedy Film Festival) |
| Japan | 27 March 2010 | (Okinawa International Movie Festival) |
| Japan | 3 July 2010 | |
| Japan | 20 October 2011 | (Tokyo Food Lovers Film Festival) |
Also Known As (AKA)
| ¿Qué pasó ayer? | Argentina, Mexico, Peru, Uruguay, Venezuela (imdb display title) |
| Hangover | Germany, Norway |
| Very Bad Trip | Belgium (French title), France |
| A Ressaca | Portugal |
| B'Derekh L'Khatunah Otzrim B'Vegas | Israel (Hebrew title) |
| Baksmällan | Sweden |
| Felekten bir gece | Turkey (Turkish title) |
| Kac Vegas | Poland |
| Kauhea kankkunen | Finland |
| Lendemain de veille | Canada (French title) |
| Mamurluk | Croatia |
| Mamurluk u Vegasu | Serbia |
| Marea mahmureala | Romania |
| Másnaposok | Hungary |
| Pagiras | Latvia |
| Pagirios Las Vegase | Lithuania |
| Parba ve Vegas | Czech Republic |
| Pohmakas | Estonia |
| Resacón en Las Vegas | Spain |
| Se Beber, Não Case! | Brazil (imdb display title) |
| Stopping in Vegas on the Way to a Wedding | Israel (English title) |
| The Hangover | Greece |
| Tømmermænd i Vegas | Denmark |
| Una notte da leoni | Italy |
| Vo stvorici po opici | Slovakia |
| Мальчишник в Вегасе | Russia |
| Последният ергенски запой | Bulgaria (Bulgarian title) |
