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Two flights that appear to connect neatly on a search screen can require an arrival, a baggage collection and a completely new departure process. Before buying separate tickets, establish where your checked bag will be delivered and what you must do to reach the next bag-drop desk.
Ask about the bag, not just the boarding pass
Online check-in for your second flight does not prove your suitcase will transfer. Ask the operating airlines whether they will through-check your baggage on those exact bookings, then inspect the destination printed on the bag tag when you check in. If the answer is unclear, plan on reclaiming and rechecking it. A shared airline alliance alone is not a promise.
Rebuild the journey as a sequence
For example, Heathrow describes self-connections as passing immigration, collecting bags, leaving arrivals, changing terminal when necessary, and completing check-in and security again. This is an airport-specific example, not a universal sequence for every country. Consult your airport and airlines for the actual process.
- Find the arrival terminal and baggage-reclaim location.
- Check whether entering the country is necessary and whether your documents permit it.
- Find the onward terminal and its public transfer route.
- Record the onward airline's bag-drop and boarding deadlines.
- Allow time for queues and delays between those steps.
The useful deadline is earlier than departure
A flight departing at 16:00 does not mean a suitcase can be checked at 15:59. Work backwards from the airline's bag-drop deadline, then allow for the trip from arrivals. Use a written timeline instead of subtracting one scheduled flight time from another. The first flight's landing time also is not the time you will be standing at the terminal exit.
A minimum connection time is not your personal guarantee
A connection advertised on a protected through-ticket may use a different baggage and passenger transfer process. Do not copy that interval into a separate-ticket itinerary. British Airways' Heathrow guidance explicitly treats separate bookings differently and warns that missing the next flight may create additional costs.
Compare the whole price
Add checked baggage fees, terminal transport, food during the buffer and any hotel you need. Consider what you would do if the first flight were cancelled: whom you would contact, whether the second booking can change, and what an overnight stay would mean for your plans. A cheaper fare can still be a reasonable choice when you understand and can absorb those consequences.
Before paying, save the relevant airline instructions and booking conditions. If any essential step depends on an unconfirmed assumption, resolve that assumption first or choose an itinerary with more room.
Sources: Heathrow self-connection process; British Airways connections and separate tickets.
