From Oxford train to Baker Street Underground Station, Tube to King's Cross St. Pancras Underground Station, walk to London St Pancras International, then train to Luton Airport Parkway. 1 h 56 min £54. From Oxford bus to Luton Airport. 2 h 5 min £14. From Oxford drive to London Luton Airport (LTN). 1 h 9 min £12. From Oxford towncar to London Luton Airport. 1 h 9 min £161.