Southwest Airlines has announced major network plans for next summer, adding more than a dozen red-eye flights to its schedule and expanding popular domestic routes. 

The airline has extended its booking schedule through next August, Southwest announced on Wednesday. Starting June 5, 2025, the airline will fly daily between these domestic cities, with a key expansion out of Seattle:

• Austin (AUS) to/from Boston (BOS)
• Baltimore (BWI) to/from Portland, Ore. (PDX) and Seattle (SEA)
• Dallas (DAL) to/from Seattle (SEA)
• Denver to/from Myrtle Beach (MYR) and Savannah (SAV)
• Nashville to/from Seattle (SEA)

In addition, Southwest will introduce seasonal service to Cancun (CUN) from Colorado Springs (COS) next summer, marking the airport’s first-ever international service. This new route will begin on June 7, 2025, operating on a once-weekly basis on Saturdays.  

2025 is shaping up to be a big year for Southwest, as the popular domestic airline introduces brand-new seating on its incoming Boeing 737-800 and 737 MAX-8 aircraft. 

Additionally, following its announcement earlier this year of a “multi-year transformation to a 24-hour operation,” the airline remains on track to launch its first-ever red-eye flights in February 2025. Southwest has unveiled over a dozen new overnight services set to begin in early June: 

• Honolulu (HNL) to Los Angeles (LAX)
• Lihue (LIH) to Las Vegas (LAS)
• Long Beach (LGB) to Baltimore (BWI)
• Ontario (ONT) to Baltimore (BWI)
• Portland, Ore. (PDX) to Baltimore (BWI)
• Sacramento (SMF) to Orlando (MCO)
• San Francisco (SFO) to Baltimore (BWI) and Nashville (BNA)
• San Jose (SJC) to Baltimore (BWI)
• Seattle (SEA) to Baltimore (BWI), Chicago (MDW), Houston (HOU), and Nashville (BNA) 

Alongside the previously announced flights departing from Hawaii to the mainland U.S., Southwest suggests that more red-eye services will be gradually added. While the decision to add red-eyes has been controversial among loyal Southwest fliers, the new flight times can be time-savers for those flying from western to eastern time zones.