Arsenal have never won the champion league, the nearest they reached was the 2006 final, in which they lost to Barcelona, 2-1.
Once, in 1996. They've also lost in the Final three times (1997, 1998 and 2003).
In the Champions League era, Milan were runners-up in 1993, 1995 and 2005. Pre-CL they also lost the final in 1958.
Arsenal have reached the champion league for the 12 years in a row but they lost the final to Barcelona in the final 2-1 was the score.
Arsenal have not won the champion league as yet but they reach the teams for the cgampion league each year.They did reach one final and lost to Barcelona.
If you are asking of the champion league then they have not won it at all.But they did reach the final once in 2006, where they lost to Barcelona.
Manchester United have only ever lost one Champions League final, against Barcelona in 2009.
Three times in the Champions League era: 1993 (to Marseille), 1995 (to Ajax) and 2005 (to Liverpool). They also lost the 1958 European Cup final to Real Madrid.
2000 and 2001. lost both times
Manchester United have lost the UEFA Champions League final twice. They lost to FC Barcelona in 2009 and 2011.
Juventus lost to Real Madrid in the 1998 Champions League final.
Twice. They lost the first one to Manchester United in the 2007-2008 Champions League Final in Moscow.