From Streatham train to London St. Pancras, train to Luton Airport Parkway Rail Station, then line 888 bus to Airport Bus Station. 1hrs 24min £23. From StreathamSt.Leonard's Church line 159 bus to Mayfair, Marble Arch (W1) then bus to Airport Bus Station. 2hrs 23min £10. From Streatham taxi to London Luton. 54min £136. From Streatham drive to London Luton. 54min £8. From Streatham Uber to London Luton. 54min £73.