As of 2026, Glasgow Airport (GLA) recommends arriving at least 2 hours before a domestic flight (within the UK or Ireland) and 3 hours before international or long-haul flights. If you are flying to a high-security destination like the United States or the Middle East (e.g., with Emirates), arriving 3.5 to 4 hours early is often advised to account for additional document checks at the gate. These times are especially important during peak holiday periods or early morning "rushes" when security queues can back up. If you have already checked in online and only have carry-on luggage, you might be tempted to cut it closer, but Glasgow's security area can be unpredictable, and the walk to the farthest gates in the international pier can take 10-15 minutes. Additionally, if you are driving, you should factor in extra time for the "Drop-Off" zone or the shuttle bus from the Long Stay car park. For those using the First 500 Glasgow Airport Express bus from the city center, the journey usually takes 15-20 minutes, but morning traffic on the M8 motorway can easily double that time.