Passport validity rules are set by the destination country, not by your airline, and they vary. Some countries require six months of validity beyond your date of entry; others require validity only through your stay.
Airlines can deny boarding if your passport does not meet the destination's requirement, which makes this worth checking before you book rather than before you fly.
What to check
- Find your destination's current requirement on the official U.S. Department of State country page
- Count validity from your date of entry, not your booking date
- Allow processing time if renewal is needed — it varies through the year
- Check blank-page requirements as well, where they apply
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