Southern operates a train from Brighton to Hastings hourly. Tickets cost $25 - $40 and the journey takes 1 h 3 min. Alternatively, you can take a bus from Brighton to Hastings via Eastbourne, Pier (Queens Gardens) in around 2 h 29 min.
From Brighton train to Hastings. 1 h 3 min £21. From Brighton, North Street (Lloyds TSB) bus to Eastbourne, Pier (Queens Gardens) then bus to Hastings, Pier (White Rock Theatre). 2 h 29 min £11. From Brighton taxi to Hastings. 52 min £92. From Brighton drive to Hastings. 52 min £7. From Brighton rideshare to Hastings. 1 h 12 min £4. From Brighton Uber to Hastings. 52 min £90.