Originally Posted by SF1K

Using the KVS tool, it seems that UA does have a published PHL-NRT fare of $970, is fare VLXJP2M.

Here are the day/time/season restrictions:


DAY/TIME: APPLIES AT ANY TIME MON-THU ON INTL SECTOR.
DAY/TIME IS BASED ON TRIP DATE OF INTL SECTOR.
SEASONS: 9JAN-27APR, 24OCT-8DEC OR 25DEC-1JAN THE FOLLOWING YEAR.

If you like let me know the dates and where in Japan if not NRT and I'll look again. Be happy to help you find a fare upgradeable with SWUs.

Edited to add: From BWI it is 890, with same day/time/season restrictions, from the other airport you mentioned it is the same as from PHL.