How to Buy WiFi on United? To buy WiFi on United Airlines, visit its official website and sign in to your account. Then, click on the travel info option and select the buy now icon. Now, enter the confirmation number and finally make the payment with cash or miles. Moreover, the United Airlines WiFi is available on both domestic and international routes for some selected routes. The WiFi is free for passengers with a MileagePlus member card or upper-class flyers. Read more: https://tinyurl.com/united-airlines-wifi #unitedairlineswifi #unitedwifi