Showers at or near each airport: lounges with shower rooms, sleeping pods, and gym day passes with showers. Every airport below has at least one verified option. Lounge entry usually needs a same-day boarding pass, so check the access rules before you go.
Prices and hours change. Verify the price, hours and access rules with the venue before you go. London Heathrow prices are in GBP. Distances marked about are estimates.