Go through your results for flights to Rouen in France with Netflights.
Flexible on dates? Conducting your search by month allows you to compare prices to Rouen throughout the year. Accommodation prices will also be higher at this time of year.
Or broaden your search by looking at other airports in France.
For even more options, check what other airports you could fly to Rouen from. You might be able to make a saving by going from a different airport or city.