Save at least $9 on over 100 winter and spring routes. Buy Now at DealBase Tips On the DealBase landing page, click "United Airlines" in the top line to see this sale. We found this price on flights departing on January 22 from Washington, D.C. (IAD) to Providence, RI (PVD). All prices, dates, and booking details were valid at the time of publication. Book this travel deal by January 2 for flights from December 24 through May 20.