Go through your results for flights to Aberdeen USA in USA with Netflights. Although KLM 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 Aberdeen USA throughout the year. Accommodation prices will also be higher at this time of year.
So, if the flights to Aberdeen USA don't work for you, you could always try searching for flights to other airports in USA.
You can also broaden your search by looking at more than one departure airport. Have a look around – you might be able to save by flying from a different airport or city.