N'abalị iri na anọ n'ọnwa Jenụwarị, n'afọ 2012, Flanagan meriri n'ọsọ marathon e ji agba ọsọ n'egwuregwu Olimpik nke mba Amerịka, nke e mere na Hụstọn. Ọ gara n'ihu na-anọchite anya Team USA na marathon Olympic nke ụmụ nwanyị na London, na-agwụ 10th na oge nke 2: 25:51. O meriri ndị na-agba ọsọ n'ọkara marathon nke Lisbon na Machị, na-edekọ oge nke 1:08:52. Ọ bịara na 25th na 2012 IAAF World Half Marathon Championships
Ọ dị mma.