Originally Posted by
tejolote
...My total budget for flight is $1500......I've heard that an upgrade can sometimes be purchased at the gate. Is this even remotely possibly?...
Welcome to FlyerTalk,
tejolote
Please consider seriously the medical implications, as detailed by others on this thread, so soon after such surgery!
US has
GoUpgrades available for purchase at the gate (or 24 hours prior to first flight). Around the dates you mention, I'm seeing $677 all-in Economy roundtrip SEA-PHL-BRU. On the return, upgrades can be purchased if there's availability, the transAtlantic portion (GoEnvoy) for $500 (or Euro equivalent at BRU) and the domestic PHL-SEA for a maximum $250. Adding up $677 + $500 + $250 equals $1427, within your $1500 flight budget
While US business class ("Envoy") transAtlantic is mediocre compared to the competition, and US domestic First is nothing more than a larger seat with some amenities, it's comfortable and should be adequate for your post-surgery flights.