Originally Posted by
jsloan
I would not count on this as a strategy, as there's no guarantee that you can add segments in this manner. UA has cut down quite a bit on their flexibility. Also, OP doesn't yet have Gold, so there would likely be a $75 charge per SDC.
Best just to book BUF-IAD-EWR-IAD-BUF for $274 if the one-way is $137.
Good point -- I forgot that SDC incurs a fee below Gold. If you plan for 4 and aren't able to add legs you'll still be happy with the results.