Ending today, Southwest Airlines offers 1-way fares nationwide with prices starting at $43.10. (Click on "Southwest Airlines" in the top line to see this sale.) That's $3 under our mention from last week and the best price we've seen for flights from Southwest. It's also a current low by $62. This price is valid on flights departing from Ontario, CA, (ONT) with arrival in Sacramento, CA, (SMF) on March 30. Book this travel deal today for travel from March 17 through June 3. Click here to see more routes.