Southwest Airlines will increase its service out of Baltimore and to Hawaii as part of its latest flight schedule announcement. From Baltimore/Washington, Southwest is adding 17 departures "on established and popular routes" for a total of 240 daily departures from the airport in spring 2020. Also in April, Southwest will add daily service between San Diego and both Honolulu and Kahului, boosting its total number of daily flights between California and Hawaii to 28. In addition, Southwest will increase on April 14 interisland service between Honolulu and Kahului from four daily flights in each direction to six daily flights in each direction.