How to Write a Formal Complaint to Airlines for Lost Bags in 2026

VeloxTravel Editorial · Updated 2026

Experiencing a lost bag during travel can be incredibly frustrating and inconvenient. Not only does it disrupt your plans, but it can also lead to unexpected expenses. This article will guide you on how to effectively write a formal complaint to an airline for a lost bag, ensuring you know your rights and what compensation you can demand.

What Are Your Rights When an Airline Loses Your Luggage?

Under the Montreal Convention, which governs international air travel, airlines are liable for lost luggage and must compensate passengers up to approximately €1,500 (about $1,700) for delayed or lost baggage. Airlines typically have 21 days to locate your bag before your claim can escalate. For domestic flights, the Department of Transportation (DOT) enforces similar regulations, often capping compensation around $3,500.

ScenarioTimeframe / AmountWhat You Can Claim
Delayed bag (24 hours)Up to $100Essential items (e.g., toiletries)
Lost bag (21 days)Up to $1,700Full bag compensation under Montreal Convention
Domestic lost bagUp to $3,500Value of lost items
Claim denialWithin 7 days of denialAppeal process
Delayed bag (5-14 days)Varies by airlineCompensation for inconvenience

How Do You Start Writing a Complaint Letter to an Airline?

Begin your complaint by clearly stating your flight details: flight number, date, and a description of the lost bag. Next, include your contact information and any reference numbers provided by the airline. Use a respectful tone and detail the impact of the lost bag on your travel experience. Finally, specify what compensation or resolution you are seeking, such as reimbursement for expenses incurred or a full replacement of the bag.

What Specific Information Should You Include in Your Complaint?

Your complaint should include the following vital information: your name, address, and phone number; flight details (flight number, date, and route); a description of the lost bag (color, brand, any distinguishing features); and any relevant receipts for purchases made due to the lost bag. Attach copies of any previous correspondence with the airline regarding your claim.

What Should You Do If Your Complaint Is Ignored or Denied?

If your complaint does not receive a timely response, or if the airline denies your claim, escalate the matter. Contact the airline’s customer service or use social media platforms to express your concerns publicly. If necessary, file a complaint with the DOT or seek legal advice to understand your rights under aviation regulations.

Insider Tip: Always keep receipts for any purchases made due to the luggage loss. Airlines may reimburse you for reasonable expenses like clothing or toiletries, but you’ll need proof of purchase to support your claim.

What is the typical response time from airlines for lost luggage claims?

Most airlines aim to respond to lost luggage claims within 30 days, but it can take longer depending on the complexity of the case.

Can you receive compensation for lost items inside your luggage?

Yes, you can claim compensation for lost items, but the reimbursement will be subject to the airline's policies and the value of the items must be proven.

What should you do if the airline denies your claim?

If denied, request a detailed explanation, and consider escalating to regulatory bodies or seeking legal advice, especially if you believe your rights were violated.

Useful resources: Escalate your case via AviationADR (UK) or CEDR.