Fly lie-flat, nonstop from Seattle to Istanbul in Turkish Airlines’ business class! Dates are available for month of February, March, April (most available), May, September and October.
You’ll fly the new 787 Dreamliner with Turkish’s best business class seats in 1-2-1 configuration.
You can either book with Turkish 45k Miles&Smiles miles, or with United 77k MileagePlus miles. However, if you book with Turkish Airlines, note that their web site only allows booking one ticket for the first time, and then add more later. You should download and use their APP, which allows booking for multiple passengers at once. This way you can ensure they have available seats for all passengers.