Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Surabaya to Laos as you normally would.
If you book a flight to Laos from Surabaya, you will be flying from Juanda, which is the city’s only airport. Surabaya Juanda (SUB) is located 15.0 km from the centre of Surabaya.
Great question - SUB to VTE just means Surabaya Juanda Airport to Vientiane Wattay Airport. Now you’ll know what these unique codes when you look for flights! Luang Prabang Airport (LPQ), Pakse Airport (PKZ), Savannakhet Airport (ZVK), Phonsavan Xieng Khouang Airport (XKH), Huay Xai Houeisay Airport (HOE) are other airports near this flight route and their unique identifiers/IATA codes.