| Season | Team | Competition | MP | G | A | Rating | ||
|---|---|---|---|---|---|---|---|---|
| 2018 | Philadelphia Union | MLS | 0 | 0 | 0 | 0 | 0 | – |
| 2017 | Philadelphia Union | MLS | 22 | 1 | 0 | 6 | 0 | – |
| 2014/2015 | Charlton Athletic | Championship | 3 | 0 | 0 | 0 | 0 | – |
| 2013/2014 | Sheffield Wednesday | Championship | 18 | 0 | 0 | 2 | 0 | – |
| 2013/2014 | Queens Park Rangers | Championship | 0 | 0 | 0 | 0 | 0 | – |
| 2012/2013 | Málaga | La Liga | 2 | 0 | 0 | 0 | 0 | – |
| 2012/2013 | Sporting CP | Primeira Liga | 0 | 0 | 0 | 0 | 0 | – |
| 2011/2012 | Sporting CP | Primeira Liga | 17 | 4 | 0 | 5 | 0 | – |
| 2010/2011 | Twente | Eredivisie | 8 | 0 | 0 | 2 | 0 | – |
| 2010/2011 | Milan | Serie A | 0 | 0 | 0 | 0 | 0 | – |
| 2009/2010 | Milan | Serie A | 0 | 0 | 0 | 0 | 0 | – |
| 2008/2009 | Standard Liège | First Division A | 34 | 3 | 0 | 2 | 0 | – |
| 2007/2008 | Standard Liège | First Division A | 33 | 2 | 0 | 0 | 0 | – |
| 2006/2007 | Newcastle United | Premier League | 11 | 0 | 0 | 0 | 0 | – |
| 2006/2007 | Standard Liège | First Division A | 15 | 1 | 0 | 0 | 0 | – |
| 2005/2006 | Standard Liège | First Division A | 29 | 2 | 0 | 0 | 0 | – |
| Total | 192 | 13 | 0 | 17 | 0 | – | ||
| Date | From | To | Type | |
|---|---|---|---|---|
| - | Charlton | Philadelphia | N/A | |
| - | Sheff Wed | Charlton | Free | |
| 01 Nov 2014 | QPR | Sheff Wed | Free | |
| - | Sporting CP | Málaga | Loan | |
| 07 Jan 2011 | Milan | Sporting CP | Free | |
| 01 Nov 2011 | Milan | Twente | Loan | |
| 07 Jul 2009 | Standard | Milan | Free | |
| - | Standard | Newcastle | Loan |
O. Onyewu career history shows progression across clubs and competitions, including club timeline, national team appearances and overall career totals.