For an Icelandair flight arriving at Keflavík (KEF) on April 5, 2026, passengers should prepare for early morning arrivals, with online check-in opening 36 hours prior and airport kiosks opening at 5:00 AM. Baggage allowances vary by fare class, with strict carry-on dimensions of 55x40x20cm enforced. For comprehensive details on your itinerary and travel options, visit Icelandair . Baggage on Icelandair flights