There are several airlines that operate frequent flights from Houston (IAH) to Barcelona (BCN) including

• United Airlines with 116 flights a week
• Lufthansa Cargo with 44 flights a week
• American Airlines with 42 flights a week
• Delta Air Lines with 27 flights a week
• British Airways with 24 flights a week

The earliest flight leaves George Bush Intercontinental Airport at 10:30 and arrives at Barcelona Intl. Airport at 07:45. The last flight of the day departs Houston at 23:05 and arrives at Barcelona at 20:30.

The flight distance from Houston to Barcelona is about 8887 km, the shortest flight is 11 hours 46 minutes with United Airlines."

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