Relax. You’re going to be in the air a while on these trips.

Technology and curiosity are sending fliers — and airlines — farther afield

United Airlines made news earlier this month when it announced a new flight between Los Angeles and Singapore.

The route will be the longest flown by any U. S. airline when it begins in October, with the leg to Singapore projected to take a whopping 17 hours, 55 minutes.

Until then, however, the current longest flight flown by a U. S. airline is another United route to Singapore. That service, from United’s San Francisco hub, comes in at 8,467 miles, according to the carrier. The flying time is a “mere” 16 hours, 25 minutes.

To get a better look at the longest routes offered by U. S. airlines, we asked airline data firm OAG to crunch its numbers for a list of the top 20 long- haul flights flown by carriers based in the United States.

United had the most, accounting for 12 of the 20 longest routes flown by U. S. airlines. American had six routes among the top 20 while Delta had four. ( Three airlines fly one of the top 20 routes.)

Just missing the cut were United’s non- stops between San Francisco and Chengdu, China, ( No. 21 at 6,879 miles); Delta’s Atlanta- Tokyo Narita route ( No. 22 at 6,860 miles) and American’s Dallas/ Fort Worth- Seoul flight ( No. 23, 6,850 miles).

The full list of flights can be seen at right.

GETTY IMAGES

TED S. WARREN, AP Keeping hydrated and getting up to move around a few times, especially during a long flight, are musts.

MYLOUPE, UIG VIA GETTY IMAGES And most airlines have outfitted planes with an array of entertainment options to make the time go more quickly.