After a season with Swedish second division club Jönköping in 1977, Teitur helped Öster to three league championships in Sweden's top-flight Allsvenskan between 1978 and 1981.

After a season with Norwegian Second Division club Grei, Teitur took charge of Lillestrøm and led them to second- and fourth-placed Tippeligaen finishes in 1994 and 1995 respectively.

[citation needed] Teitur helped the Baltic nation move up from 145th (January 1996) to 68th (November 1999) in the FIFA World Ranking.

With nearly four decades of experience in European football, Teitur became the sixth head coach in the history of the Vancouver Whitecaps after signing a two-year deal with the club on 11 December 2007.

He was at the helm when the Whitecaps claimed their second United Soccer League First Division championship in three seasons after a 2–1 victory over Puerto Rico Islanders on 12 October 2008.

[4] After producing only one win in three months of action, Teitur was released from his contract on 30 May 2011 with Whitecaps Director of Operations Tom Soehn stepping in to replace him in the interim.

[9] Íþróttabandalag Akraness Östers IF Flora Tallinn Vancouver Whitecaps FC Barasat Euro Musketeers Media related to Teitur Þórðarson at Wikimedia Commons