lalali 11 Ways to Call KLM Customer Service by Phone, Email, or Chat options: The Comprehensive Guide To reach a live person at KLM Airlines customer service for support, you can call their 24/7 KLM Airlines Phone number hotline at 1-888-793-3403. OTA (Live Person) or 1-800-KLM Airlines 1-888-793-3403... Apr 14, 2025