The Warsaw Convention explained: when it applies and how it limits airline compensation
For most US travelers, the Warsaw Convention won’t apply to their flight, but this older, international treaty still plays a role in certain international travel scenarios. Depending on where you’re traveling, it can determine how much an airline is legally required to pay you when something goes wrong.
Knowing when it applies matters, because the difference between the Warsaw Convention and the newer Montreal Convention can mean hundreds or even thousands of dollars in compensation.
Key takeaways
- The Warsaw Convention is an older international aviation treaty that still applies in limited situations, even though it has largely been replaced by the Montreal Convention.
- For US travelers, the Warsaw Convention applies only when the Montreal Convention does not, usually because one country on the route has not adopted the newer treaty.
- Compensation under the Warsaw Convention is significantly more limited, often using rigid caps that may not reflect the actual value of a passenger’s losses.
- Most international flights from the United States, including routes to the UK, Europe, Canada, and much of Asia, are governed by the Montreal Convention rather than Warsaw.
- Knowing which convention applies can make a substantial difference in compensation, as airlines may default to Warsaw’s lower limits unless passengers challenge them.
What is the Warsaw Convention?
The Warsaw Convention, introduced in 1929, was one of the first international agreements to define airline responsibility for international flights. It set standard rules for how airlines could be held liable for:
- Passenger injury or death,
- Lost, delayed, or damaged baggage, and
- Mishandled cargo
It also introduced compensation limits and formal requirements, such as issuing passenger tickets, to bring consistency to international air travel.
Over the decades, it was updated before being fully modernized and replaced by the Montreal Convention of 1999 (MC99). The Montreal Convention brought stronger passenger protections, higher compensation limits, and a clearer, more unified legal framework that now applies to most international flights today.
The Warsaw Convention is no longer the dominant framework for international air travel, but it remains legally relevant because it still applies where the Montreal Convention does not. In those situations, it sets binding limits on airline liability, and passengers who are unaware of its continued existence risk having their claims assessed under far less generous rules. – Anton Radchenko, Esq., Aviation Attorney
When the Warsaw Convention applies to your flight
The Warsaw Convention applies only when the Montreal Convention does not. For US travelers, this usually happens in one of the following situations.
One country on your route is not a Montreal Convention signatory
For passengers in the United States, this typically involves:
- Flights to or from politically isolated countries
- Routes involving smaller states with older aviation treaties
- Certain destinations with limited international aviation agreements
The vast majority of international flights from the United States, including travel to the UK, Europe, Canada, Japan, and most of Asia and South America, are governed by the Montreal Convention, not the Warsaw Convention.
Your itinerary includes non-standard routing
Warsaw-based rules may also apply on some charter flights, complex interline flights, or on routes that involve multiple airlines where one segment falls outside Montreal Convention coverage
Which countries still operate under the Warsaw Convention?
A limited group of countries have not ratified the Montreal Convention, which means flights involving these destinations may still be governed by Warsaw-based liability rules. A few countries that are not signatories of the Montreal Convention and only follow Warsaw Convention rules include:
- Iran,
- North Korea,
- Syria,
- Eritrea, and
- Timor-Leste
On routes involving these countries, airlines may have lower compensation limits for lost, delayed, or damaged baggage, stricter caps on liability, and more limited recovery for delay-related losses.
Liability limits under the Warsaw Convention
Under the Warsaw Convention, airline liability for mishandled checked baggage is strictly capped using a weight-based formula, rather than the actual value of the items inside your bag.
Compensation is limited to 250 gold francs per kilogram, which in modern terms works out to around $9 per pound. This means a lightweight suitcase containing expensive clothing, electronics, or work equipment could result in a very low payout, even if the loss was significant.
The Warsaw Convention does not account for what your belongings are worth. Once the weight-based cap is reached, the airline has no further financial responsibility, regardless of the contents.
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How the Warsaw Convention compares to the Montreal Convention
Instead of linking compensation to baggage weight, the Montreal Convention sets a single per-passenger liability cap that reflects the actual loss.
Under the Montreal Convention, airlines are liable for lost, damaged, or delayed checked baggage up to 1,519 Special Drawing Rights (SDRs) per passenger, which typically equals around $2,000 to $2,200 USD, depending on exchange rates.
Baggage liability limits at a glance
Convention | How compensation is calculated | Maximum baggage liability |
Warsaw Convention (1929) | Weight-based | ~ $9 per pound (≈ $20/kg) |
Montreal Convention (1999) | Per passenger | 1,519 SDRs (≈ $2,000–$2,200) |
How to tell which convention applies to your flight
In most cases, it comes down to where your flight departs from and where it arrives. If both countries involved in your trip have adopted the Montreal Convention, then those rules apply. If one of the countries has not, the Warsaw Convention may still govern your flight.
If you’re unsure, it’s worth checking the airline’s ticket terms or asking the airline to confirm in writing which convention applies before accepting any compensation.
Time limits for making a claim under the Warsaw Convention
Both the Warsaw Convention has a strict two-year deadline for bringing a claim against an airline. This time limit usually starts on the date your flight arrived, or was scheduled to arrive, at its final destination. Once this period has passed, airlines are no longer legally obliged to pay you anything, even if the disruption itself would otherwise qualify.
Why airlines may rely on Warsaw limits unless questioned
When the Warsaw Convention applies, airlines may refer to its lower liability limits when handling claims. This does not always indicate bad faith, but it can result in much lower compensation than passengers expect.
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Final thoughts
For most US travelers, the Warsaw Convention will never come into play, but when it does, it can dramatically limit what an airline is required to pay you for baggage loss or damage.
Understanding whether your flight is governed by Warsaw or the Montreal Convention is about making sure you don’t accept a payout that’s much lower than the law actually allows. When international travel involves unusual destinations or complex routing, confirming which convention applies can make the difference between a minimal settlement and fair compensation.
FAQ
Does the Warsaw Convention still apply if one country on my route has adopted the Montreal Convention?
Yes, it can. The Montreal Convention only applies if both the departure and arrival countries are parties to it. If one of the countries has not adopted Montreal, the Warsaw Convention (or one of its protocols) may still govern the flight, even if the other country uses Montreal.
How can I tell which convention applies if my flight involves multiple airlines or a codeshare?
What matters most is the overall journey shown on your ticket, not which airline operates each segment. If the itinerary is a single contract of carriage, the applicable convention is determined by the countries involved in the journey, not by the marketing or operating carrier.
Does the Warsaw Convention cover baggage lost during transfers or connections?
Yes. If your journey is covered by the Warsaw Convention and your baggage is lost during a connection that is part of the same ticketed journey, the Convention can still apply. The airline responsible is usually the one operating the segment during which the loss occurred, though this can be disputed in practice.
What happens if the airline never weighed my bag?
If no official weight was recorded, airlines often rely on standard or average baggage weights set out in their internal procedures or accepted industry practice. This can lead to disputes, as the Warsaw Convention bases compensation on weight rather than actual value.
Can airlines further limit their liability through their own terms and conditions?
No. Airlines cannot reduce liability below the limits set by the Warsaw Convention through their terms and conditions. Any clause that attempts to do so would generally be unenforceable. However, airlines can rely on defences allowed under the Convention.
Does the Warsaw Convention apply to domestic flights?
No. The Warsaw Convention applies only to international carriage, where the place of departure and destination are in different countries (or involve an agreed stopping place in another country). Domestic flights are governed by national law instead.
Author:
Joanna Teljeur
Job/Position: Senior Editor & Content Lead
Joanna Teljeur is a senior editor and writer with 15+ years of experience in editorial leadership, journalism, and content development with a focus on consumer rights, aviation law, and public-interest reporting. Her work centers on transforming complex regulatory and legal topics into clear, accurate, and accessible content for international audiences.
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