Thank you to everyone that has responded. Very appreciated.

Travel would be OW SGN/HAN on 11/28, we'll be taking a 3 day cruise of Bai Tu Long Bay, then OW HAN/REP on 12/2. The $240 pricing is directly from VN's site, not a 3rd party. I've found that if I price these as individual flights, the cost skyrockets. This is the most decent fare I've discovered so far for both legs.

VJ does seems to have better deals, but considering we have somewhat of a tight schedule, I'd like to stick with an airline that is less likely to cancel flights. VN also includes baggage in their cost, which is ideal. The less loose ends we have to deal with, the better, imo.