The DART is not a free station shuttle. Rail tickets to or from 'Luton Airport' include it automatically; tickets to 'Luton Airport Parkway' or 'Luton' do not — and the separate DART single is £4.90 (half price for 5–15s) on top.
In March 2023 the DART replaced the old free shuttle bus between parkway and terminal — a paid, ticketed people-mover. Older guides still tell you to 'follow the shuttle bus'.
The airport's autumn 2026 promo with National Express sells up to 10,000 £2 one-way fares only from London TO the airport, booked 15 Sep–31 Oct with code LUTON2, at least 14 days ahead, for travel to 10 December. The outward trip out of Luton is normal demand pricing.
Anyone collecting you in the terminal Pick Up Zone pays £7 for 10 minutes plus £1 per extra minute; the airport itself says drivers are likely to add this to the overall fare. A 'cheap' quote can quietly hide it.
The people-mover shuts down 25–26 December because National Rail services do not operate — trains-to-London plans for those dates simply fail at the footbridge.