UA/NH: WAS/EWR/CLT/ORF/RIC/RDU/PHL/CHO/BOS and many other cities to SGN for $642-$659
If you happen to visit Saigon, this is a great deal. There is a minimum of 4 nights, departing on Wednesday or Thursday. The fare is good for September to early December. This fare should be available from other cities. As far as MRs are concerned, this deal will give you a lot of PQMs and fewer UA BIS miles (SGN-NRT on NH). Other airlines also offer similar fares. Good travels.