[Tempatan] What is the cheapest day to book flights on Southwest?

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https://mforum.cari.com.my/forum.php?mod=viewthread&tid=5395952&extra=
https://mforum.cari.com.my/forum.php?mod=viewthread&tid=5395952&extra=
https://mforum.cari.com.my/forum.php?mod=viewthread&tid=5395952&extra=
https://mforum.cari.com.my/forum.php?mod=viewthread&tid=5395952&extra=

https://mforum.cari.com.my/forum.php?mod=viewthread&tid=5395952&extra=

[Tempatan] What is the cheapest day to book flights on Southwest?