Originally Posted by
cerps343
I'm booking travel through my company's travel portal which requires me to book economy. However, I would prefer to fly F for this trip. Is it possible to book the flight and then once it's booked, pay the difference out of pocket for a seat in F? Or am I stuck with only being able to pay for an E+ seat out of pocket? Most of the articles I found on Google discussed upgrading with miles rather than cash.
It can be very difficult. Be aware that some corporate fares can be difficult to upgrade through UA ... I have failed on that before. If this is a non-discounted fare that you simply have to book through your travel portal you should be able to upfare w/o a change fee.