Whether you repeat security depends on the airport, routing, terminal layout, countries involved and whether you remain in a protected transfer path. The safe starting point is to follow the airport and airline connection instructions for your exact itinerary.
Terminal changes can change the answer
Some airport terminal changes stay airside while others force a landside transfer and another security screening. Never infer the process only from terminal numbers.
International borders add another layer
A connection can involve passport control or immigration even when baggage is checked through. Entry and transit rules depend on nationality, routing and destination.
Separate tickets are different
Self-transfer itineraries are more likely to require landside steps such as baggage collection, new check-in or security. Build extra time rather than using a protected-connection assumption.
Use the Connection Time Checker
Model security, passport control, bags and terminal movement explicitly instead of treating the scheduled layover as free time.
Use the airport transfer path, not a generic rule
Heathrow requires connecting passengers to pass security again, while Changi places security screening near the onward-gate process. Other hubs use different layouts. This variation is exactly why AirportBoard links airport-specific connection guidance: the correct answer comes from the routing and airport process, not from whether both flights happen to appear on one screen.
Frequently asked questions
Does a connecting boarding pass mean I skip security?
Not necessarily. Airport layout and routing determine the transfer process.
What if I change terminals?
Check the airport transfer instructions; a terminal change can be airside or landside.
Sources and verification
Time-sensitive airport, airline, visa, security and transport details should always be confirmed with the relevant official source before travel.