Gatwick International Airport is 40 minutes by road and 20 to 30 minutes by rail from Brighton Railway Station (BTN). Trains depart regularly from Gatwick.
Heathrow International Airport is 1 hour 30 minutes by road and 2 hours and 45 minutes by rail (via Paddington and Circle line to London Victoria) from Brighton Railway Station (BTN). Trains depart regularly from Heathrow.