Delta Airlines has roundtrip airfares from Denver (DEN) to Brussels Belgium (BRU) for $327 including taxes/fees. This makes 1 stop.
Travel Availability:
Departs DEN: Feb 8, 9, 16, 23, 28; Mar 6, 7, 8, 9, 14, 15, 21, 22, 23
Returns DEN: Feb 16, 19, 27, 28; Mar 1, 5-16, 21, 23, 26-28
Google flights is not showing this rate, you may have to play with dates because these prices fluctuate. Go on Priceline and click on "flexible dates".
My sample travel dates: March 8-16
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