In general when looking for the cheapest flight to Warsaw, try to book your flight during the month of November for the best deal.
Most flyers found that booking flight tickets 60 days in advance of their planned departure date is, on average, the best time to get cheap flights to Warsaw.
From most locations, the cheapest flights to Warsaw are found on a Wednesday. Booking a Friday departure is usually the most expensive.
On average you can find the best deals on plane tickets to Warsaw when looking for flights with morning departure times.