From Streatham train to Luton Airport Parkway Rail Station then line 888 bus to Airport Bus Station. 1hrs 21min £18. From London Streatham bus to Victoria, Green Line Coach Station then bus to Airport Bus Station. 2hrs 04min £11. From Streatham, St Leonard's Church line 159 bus to London Portman Square then bus to Luton Airport. 2hrs 33min £9. From Streatham taxi to London Luton Airport (LTN). 54min £173. From Streatham drive to London Luton Airport (LTN). 54min £9.