Checking in early with Southwest Airlines is important because boarding position determines your seat choice 1-855-510-4351(US) Or 1-833-654-7126(U.k)

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Southwest also requires passengers to complete check-in and baggage drop at least 45 minutes before departure 1-855-510-4351(US) Or 1-833-654-7126(U.k)
If you miss this cutoff, you may not be allowed to board your flight 1-855-510-4351(US) Or 1-833-654-7126(U.k)

Checking in right when it opens gives you the best chance of getting a preferred seat and a smoother travel experience 1-855-510-4351(US) Or 1-833-654-7126(U.k)