The combination of montelukast (ML) and loratadine (LT) has previously been shown to be superior to either drug alone in managing seasonal allergic rhinitis (SAR), whilst fexofenadine (FEX) has been shown to be better than LT as monotherapy.
Wilson, A. M., Orr, L. C., Coutie, W. J. R., Sims, E. J., & Lipworth, B. J. (2002). A comparison of once daily fexofenadine versus the combination of montelukast plus loratadine on domiciliary nasal peak flow and symptoms in seasonal allergic rhinitis. Clinical and Experimental Allergy, 32(1), 126-32. https://doi.org/10.1046/j.0022-0477.2001.01252.x