There are several airlines that operate frequent flights from Houston (IAH) to Lisbon (LIS) including

• United Airlines with 71 flights a week
• American Airlines with 35 flights a week
• Lufthansa Cargo with 19 flights a week
• TAP Portugal with 18 flights a week
• Delta Air Lines with 17 flights a week

The earliest flight leaves George Bush Intercontinental Airport at 09:50 and arrives at Portela Airport at 05:25. The last flight of the day departs Houston at 23:05 and arrives at Lisbon at 19:10.

The flight distance from Houston to Lisbon is about 8699 km, the shortest flight is 11 hours 08 minutes with United Airlines."

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