I Injured My Ankle Three Days Ago With My Foot

I injured my ankle three days ago with my foot slipping from a quad bike, bruises started forming last night. Today the bruises are dark red and purple and growing. The swelling is quite big around the inner ankle bone area, but there is no pain. I am due to fly in a few hours for a short 2 hour flight, will the bruises cause anything to worry about? If I press on the swollen area it leaves a depression that takes about a minute or more to go back to its swollen state.