Around 5 daily flights are available daily. Fares tend to be expensive in 2010. 140 euro R/T is a bargain if you can find it.

Austrian airlines seems to have up to 5 daily flights from Vienna (VIE) to Brussels Airport (BRU) in 2010.

On Sundays it seems possible in 2010 to leave Vienna at 5:25 pm and arrive in Brussels at 7:10 pm.
Brussels airlines flies it's own metal between Brussels and Vienna. Sometimes their Boeing 737-400 or Airbus A319. Often their Avro RJ85 and Avro RJ100 in 2011.

There is often a codeshare with Austrian. Both airlines are owned by Lufthansa.

the return flight from Brussels to Vienna

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