Uploaded August 2026 | Updated September 2026, 2 weeks ago
Southwest Airlines Error Code: 400621357. Unable to price itinerary, or we were unable to confirm the flight you selected. Please select a flight and try again.
This error usually occurs when trying to change a flight or book a flight. This happens when your card/address is flagged as suspicious by Southwest Airlines.
Try a different Payment method. If you are using PayPal, you can add a card to your profile, then select it as your method of payment at checkout.
Use a different device or a different browser
If it fails, contact Southwest Airlines
support.southwest.com/helpcenter/s/contact-us
Southwest Airlines Error Code: 400621357. Unable to price itinerary, or we were unable to confirm the flight you selected. Please select a flight and try again.
This error usually occurs when trying to change a flight or book a flight. This happens when your card/address is flagged as suspicious by Southwest Airlines.
Try a different Payment method. If you are using PayPal, you can add a card to your profile, then select it as your method of payment at checkout.
Use a different device or a different browser
If it fails, contact Southwest Airlines
support.southwest.com/helpcenter/s/contact-us
