The cheapest way to the airport. The Pre-booked private transfer is 2 minutes quicker for PLN 173.60 more, which is not worth it at this party size.
SKM or KM train
S2S3RL · Szybka Kolej Miejska and Koleje Mazowieckie, on the ZTM ticketPickup, hours & luggage
Boards at. Warszawa Śródmieście, on the S2, or Warszawa Centralna, on the S3 — both towards Lotnisko Chopina
The 75-minute ticket, PLN 4.40, works on SKM trains and the RL train to Warszawa Płudy. Children under seven ride free; ages 7 to 16 and students under 26 with an ISIC pay PLN 2.20. The cheaper 20-minute ticket (PLN 3.40) runs out before every central station except Zachodnia. Buy at the station entrance or on board — on-board machines take cards only and validate on purchase.
Luggage. Free, and unlimited by the tariff: "Przewóz zwierząt i bagażu jest bezpłatny." A commuter train, full at rush hour.
Hours. S2 from Śródmieście runs 04:10 to 23:10; S3 from Centralna 05:24 to 22:24, both roughly every 15 to 30 minutes. The RL's own hours towards the airport are not recorded here.