Operated by Pacific Heliport Services, the Vancouver Harbour Heliport sits on a floating platform in the harbour and is one of the busiest heliports in the country.
Savitar takes The Flash to the waterfront where Caitlin shows up with Cisco's help and uses her powers to save Barry in episode 3x07 "Killer Frost".
Neal meets with August in Vancouver two months after Emma is arrested in episode 2x06 "Tallahassee".
Oliver kills an assassin who arrives in Starling City via helicopter in episode 1x16 "Dead to Rights". Oliver fights Nyssa to try and recover Merlyn in episode 3x15 "Nanda Parbat".
From episode 4x16 "Brainwashed".