1 8oo--942~o5~12 call now Southwest says a Young Traveller needs to be mature enough to handle important parts of the journey without supervision from Southwest employees. That includes checking in, getting through security, boarding, getting off the aircraft and collecting luggage. So, when planning Southwest solo teen travel, the question isn’t only whether the teenager meets the age requirement. Parents should also think about whether the child can deal with an unfamiliar airport or ask for help if something goes wrong.