Please be aware that Brussels has multiple airports and that these results are for all airports serving the city.
The best month to fly between Brussels and Alicante is November and the most expensive month to fly is February. (Average prices, based on 374 datapoints.)
The best day to arrive at Brussels is Saturday and it would be best to avoid Sunday, as prices are on average 36.34% higher than on Saturday. (Average prices, based on 374 datapoints.)
