Go through your results for flights to Bydgoszcz in Poland with Netflights. Although LOT Polish Airlines usually has the best prices, it's best to double check what's available for your travel dates.
Flexible on dates? Conducting your search by month allows you to compare prices to Bydgoszcz throughout the year. Accommodation prices will also be higher at this time of year.
So, if the flights to Bydgoszcz don't work for you, you could always try searching for flights to other airports in Poland.
Looking at a few different departure airports will give you even more choice. See what you can find. And remember, it's best to book your flights in advance wherever possible.