Hawaii's Kilauea volcano has continued to erupt two weeks after the initial explosion, prompting fears from pilots it could become impossible to fly in the area.

Video filmed on May 15 on the Big Island of Hawaii shows the volcano spewing ash hundreds of metres into the air.

Authorities have warned pilots not to fly in the airspace of the island and issued a red alert over the toxic cloud.

The volcano has been erupting since May 3, when seismic activity caused lava to flow throughout the Island.

The area around Leilani estates was worst hit, with dramatic footage showing lava devouring homes and roads.