United Airlines via DealBase offers United Airlines Roundtrip Fares Nationwide with prices starting at $128.40. (On the DealBase landing page, click on "United Airlines" in the top line to see this sale.) That's the lowest price we could find for select routes by at least $11, although we saw such fares for $12 less two weeks ago. This price is valid on flights departing from San Francisco, CA, (SFO) with arrival in San Diego, CA, (SAN) on April 26 with return on May 2. This sale includes 75 routes, including Pittsburgh, PA, (PIT); New Orleans, LA, (MSY); Washington, D.C., (IAD); and more. Book this travel deal by April 6 for travel from April 11 through June 14.

Prices, dates, and booking details were valid at the time of publication.