AC/UA/LH: IAH-AMS r/t in J for ~$2,100
Here's a decent from Houston to AMS.
https://goo.gl/flights/zazk
Fare basis P2XNC79S
TRAVEL FROM LAST STOPOVER MUST COMMENCE NO EARLIER THAN
THE FIRST SUN AFTER ARRIVAL AT TURNAROUND.
TRAVEL FROM LAST STOPOVER MUST COMMENCE NO LATER THAN 3
MONTHS AFTER DEPARTURE FROM FARE ORIGIN.
ALL TRAVEL MUST BE COMPLETED BY MIDNIGHT ON 31DEC 18.