If my non-stop flight is cancelled and I'm put on a slower indirect flight, am I entitled to compensation?

See https://europa.eu/youreurope/citizens/travel/passenger-rights/air/index_en.htm for an overview of the EU air passenger rights.

Layovers, by themselves, do not matter. But if the rerouting you're offered would have you arrive at your final destination later than the original flight, or need to depart from your origin earlier, then you could be entitled to compensation.

This depends on both the length of the delay, and how long in advance you were informed of the cancellation. Refer to the above link for details.

For a 900 km distance, the maximum compensation is 250 euro per passenger.

From the EU Air Passenger Rights, you have some protections. The rights apply only:

• If your flight is within the EU and is operated either by an EU or a non-EU airline
• If your flight arrives in the EU from outside the EU and is operated by an EU airline
• If your flight departs from the EU to a non-EU country operated by an EU or a non-EU airline
• If you have not already received benefits (compensation, re-routing, assistance from the airline) for flight related problems for this journey under the relevant law of a non-EU country.

So, from this document, you can check based on what went wrong. In your case, we're looking at a cancelled flight.

Cancellation occurs when:

• your original flight schedule is abandoned and you are transferred to another scheduled flight

[...]

If your flight is cancelled you have the right to reimbursement, re-routing or return, as well as the right to assistance and a right to compensation. Compensation is due if you were informed less than 14 days prior to the scheduled departure date. The airline has the obligation to prove if and when you were personally informed that the flight was cancelled. If this is not the case you can contact your national authority for further assistance.

However, compensation is not due if the carrier can prove that the cancellation is caused by extraordinary circumstances.

Based on your description, we can assume that the flight is cancelled, which gives you the right to reimbursement, re-routing, or return. Your description assumes that you accept Re-routing. Accepting any of the three options will revoke your rights to either of the other two options. That said, the airline may still have to provide compensation depending on the distance of your flight and length of delay past your original planned arrival time.

You're not entitled to compensation:

• if you are informed more than 14 days in advance
• if you are informed between 2 weeks and 7 days before the scheduled departure and you are offered re-routing which would allow you:
• • to depart no more than 2 hours before the original scheduled time of departure and
• • to reach your final destination less than 4 hours after the original scheduled time of arrival
• if you are informed less than 7 days before the scheduled departure and are offered re-routing which would allow you:
• • to depart no more than 1 hour before the original scheduled time of departure and
• • to reach your final destination less than 2 hours after the original scheduled time of arrival.

Assuming that you are entitled to compensation, and the airline offered you re-routing, and you reach your final destination with a delay of 2, 3, or 4 hours, the compensation may be reduced by 50%.

So. How much compensation might you get? It depends on the distance of your flight.

€250 if less than 1500 KM

€400 if more than 1500 KM within the EU and all other flights between 1500 KM and 3500 KM

€600 if more than 3500 KM

So in your case, you'd be entitled to a maximum of €250, and potentially as low as €125, assuming you're entitled to any at all.