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| Domestic flights | ~120 min before departure |
| International flights | ~180 min before departure |
Heathrow security lines, especially at Terminal 5, can be long during peak hours — one of the busier international airports for security waits.
Arrive at least 120 minutes before departure for a domestic flight at London Heathrow (LHR).
Arrive at least 180 minutes before departure for an international flight at London Heathrow (LHR).
Security and check-in congestion here is high — this airport is known for slower lines, so err toward the longer end or add extra buffer Heathrow security lines, especially at Terminal 5, can be long during peak hours — one of the busier international airports for security waits.
Yes — bag-drop lines can add 15-30 minutes at busy airports, so lean toward the longer end of the recommended range if you're not carry-on only.