The busiest times at Vancouver International Airport for check-in and security screening during Easter long weekend. For domestic flights, the busiest times are 6 a.m. to 8 a.m. and 10 a.m. to 12 p.m. For international flights, the busiest times are 6 a.m. to 8 a.m., 10 a.m. to 12 p.m. and 9 p.m. to 10 p.m. For U.S. flights, the busiest times are 5 a.m. to 8 a.m. and 11 a.m. to 12 p.m.