Go through your results for flights to Bydgoszcz in Poland with Netflights. The most popular airlines for this route are Lufthansa, with Lufthansa claiming the top spot. Although Lufthansa 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.
Bydgoszcz receives five direct and indirect flights every week, but the cheapest airline is normally Lufthansa. 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.