Between Wednesday and Monday, the Dallas-based carrier canceled 8,305 flights, amounting to 36% of its operation, according to FlightAware data.
On Monday alone, Southwest canceled 74% of its operation and it is struggling to get back on track with 63% of flights already canceled as of 11:00 a.m on Tuesday.
For comparison, the US' second-worst offender between Wednesday and Monday was Delta Air Lines with 1,865 flights canceled, which was 12% of its operation, according to FlightAware.
Email Southwest for reimbursementJonathan Weiss/ShutterstockIn some cases, travelers will decide to receive a refund for a canceled flight and rebook their own transportation, like a flight on a different carrier, a rental car, or a train.
Contact your credit card issuerDavid Slotnick/Business InsiderTravelers should also check if their credit card comes with trip insurance.