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Start by identifying which routes feature lie-flat seating.


When searching, be sure to select “Business” or “First” under cabin class.


Booking early increases your chances of snagging a lie-flat seat at the best rate.


You can also use miles to book lie-flat seats through United’s MileagePlus program.


For even more availability, look into Star Alliance partners like Lufthansa or ANA, which can be booked using MileagePlus miles.


If you're paying cash, United sometimes offers upgrades to lie-flat seats at check-in or during booking.


Premier members of MileagePlus may receive complimentary upgrades on select premium transcontinental routes.


Another option is to call United customer service directly.


Traveling for work? Many corporate travel programs include business class or lie-flat options.


Be aware of aircraft types when booking.


If you're booking with a United credit card, you may receive added perks like priority boarding or bonus miles.


Looking for extra comfort? United Polaris also includes upgraded dining, amenity kits, Saks Fifth Avenue bedding, and exclusive lounges.


After booking, monitor your reservation for any aircraft changes.


In summary, booking a lie-flat seat on United Airlines involves strategic timing, route knowledge, and sometimes, help from customer support at

