how far in advance can you check in with thomson
If not, you can check-in online from 7 days before. Alternatively, pop in to one of our travel shops. If you've booked though our website but you ask one of our travel shops to enter your API information for you, you'll need to pay a Â£5.00 admin fee.hen you need to provide API. If youâre travelling with Thomson Airways, you need to give us your API information any time from when you book, up until 6 hours before you're due to go. Visit our Flight Extras website to supply your API information.