Southwest Airlines offers 1-way fares with prices starting at $56.50. (Click on "Southwest Airlines" in the headline to see this sale.) That's tied with our mention from three weeks ago and the lowest rate we could find for select routes by $119. This price is valid on flights departing from Ontario, CA, (ONT) with arrival in Oakland, CA (OAK) on August 25. Book this travel deal by July 17 for travel August 25 through December 17. Other notable fares:

Los Angeles (LAX) to San Francisco (SFO) from $59

Houston (HOU) to Kansas City (MCI) from $63

New York (LGA) to Nashville (BNA) from $89

see all available Southwest Airlines fares