The best price found from United States to Belgium is on March 13th, 2017, travelling with Icelandair. See more options, compare prices and book: search flights.
Brussels is the major airport and is pretty well connected. Charleroi airport is a budget hub. Other airports like Liège are almost exclusively used by summer charter flights.
You may find it cheaper or more convenient to fly into one of the major airports in neighbouring countries – in Frankfurt, Amsterdam or Paris, for example – and continue into Belgium by train. Airport websites give up-to-date listings of the airlines that operate from them. The biggest Belgian carrier is Brussels Airlines (www.brusselsairlines.com).
Antwerp Airport (www.antwerpairport.be) Daily flights on CityJet to London, some seasonal Jetairfly services to Spanish and other European destinations. VLM serves Geneva, and Southampton in the UK.
Brussels Airport (www.brusselsairport.be) Belgium’s main international airport. Well connected to Europe and Africa, plus some direct flights to North America and Asia.
Charleroi ‘Brussels-South’ (www.charleroi-airport.com) Belgium’s main hub for low-cost airlines is 55km south of Brussels near Charleroi.