there are few options of getting from Stockholm Central station [ T-Centralen ] to the Arlanda airport:
- Flygbuss – from City Terminalen next to the train station – 105SEK one way
- SJ / regular train – there are few trains each day going from Stockholm to Uppsala – starting from 125SEK if booked in advance. the price includes extra fee for ‘exiting in arlanda’
- SL / pendeltåg – 125SEK
- Arlanda Express – ~268SEK, probably the fastest method
- and there’s the more time consuming i-refuse-to-pay-the-arlanda-charge-method: get a blue SL card [ 20SEK ], refill it, take 40min ride from T-Centralen to Märsta, then bus 583 to Arlanda. the whole journey will cost 50SEK and will take ~1h10min – check the exact departure dates on google public transport transit.