Line 22 serves the airport to Arrecife Monday to Friday only; at weekends and on public holidays it does not run at all and line 23 covers the route via Playa Honda. They are not two frequent parallel services — picking the wrong one means waiting for a bus that is not coming.
The airport's bus departures finish around 22:30 to 23:30 depending on the line, and outside line 162's 23:16 and 00:16 stops there is nothing after that. An arrival after about 23:00 has the taxi rank and nothing else.
Lanzarote has Terminal 1 and Terminal 2, and the buses stop on Floor 0 (Arrivals) outside each of them. Waiting at the wrong terminal's kerb means watching your bus leave from the other one, and the two are not a short walk apart with luggage.
Intercity Bus tickets are bought from the driver, and card acceptance on board is not reliable on this network. Drivers also prefer small notes and coins, and there is no machine at the airport stop to fall back on.
Lanzarote taxis run on a meter with a €3.85 minimum by day (€4.25 at night and on holidays), €1.35 or €1.55 a kilometre, a €2.10 airport supplement and a €0.60 radio-taxi charge. A driver who quotes one price for Playa Blanca before you get in is not using the tariff on the sticker.