Edinburgh Airport Bus 100 runs from the airport to Waverley Bridge (one way/return £4.50/7.50, 30 minutes), outside the main train station, via Haymarket and the West End every 10 minutes from 4am to midnight and every 30 minutes through the night. Trams run from the airport to the city centre (one way/return £6/8.50, 33 minutes, every six to eight minutes from 6am to midnight). An airport taxi to the city centre costs around £20 and takes 20 to 30 minutes.
Glasgow Airport Bus 500 runs every 10 or 15 minutes (half-hourly or hourly late at night, 24 hours a day) from Glasgow Airport to Buchanan bus station via Central and Queen Street train stations (single/return £8/12, 25 minutes). A taxi costs around £25.