A self-transfer is not a normal connection. You have bought independent journeys, and the second airline generally treats a late arrival from the first flight the same as any other reason for missing check-in.
Separate tickets can still be useful, but the saving should be assessed against the additional connection risk.
Start with the replacement cost
The most useful question is not “How likely is a delay?” It is:
If the first flight is late, what does fixing this cost?
Check the price of a same-day replacement flight, the next realistic departure, a hotel, airport transfers and any lost booking at the destination. A €90 saving may not compensate for exposure to a €500 replacement flight. The same saving may be reasonable when another airline flies the route six times a day for €60.
Separate booking means separate protection
On a single booking, the operating airlines normally have obligations when a delayed first leg causes a missed onward flight. With independently booked flights, the second carrier normally sees a no-show.
An EU competition decision describing self-connections makes the distinction plainly: separate bookings are independent services, so a passenger who misses the second flight because the first arrived late cannot normally claim assistance from the second provider.
Some booking sites sell a private “connection guarantee.” Read what it actually covers. It may require immediate contact, proof of delay, use of the platform’s chosen replacement, and compliance with a minimum connection time. It is not the same as an airline through-ticket.
Add every transfer step
The advertised connection time is not your usable buffer. Subtract:
- taxiing and the walk from the arrival gate;
- immigration;
- baggage reclaim;
- customs;
- terminal or airport transfer;
- bag drop and its earlier deadline;
- security;
- exit controls where applicable;
- the walk to the new gate.
If the first boarding pass cannot be issued online, add time for the check-in desk. If the airports are different, price the transfer at the actual time of day. The last train is not useful when the incoming flight lands ten minutes before it.
Build the connection backwards from gate closure
Use the second airline’s published deadlines and the airport’s actual route. Do not treat scheduled departure as the moment you need to reach the gate.
| Step | Planned clock time | Allowance or deadline | Source checked |
|---|---|---|---|
| First flight scheduled arrival | ___ | — | Airline booking |
| Taxi, disembark and walk | ___ | ___ min | Airport map / recent guidance |
| Immigration, bags and customs | ___ | ___ min | Airport and border guidance |
| Terminal or airport transfer | ___ | ___ min | Operator timetable |
| Second-flight bag-drop deadline | ___ | Fixed deadline | Airline |
| Security and exit controls | ___ | ___ min | Airport |
| Second-flight gate closes | ___ | Fixed deadline | Airline |
| Unallocated delay buffer | — | ___ min | Your risk decision |
If any fixed deadline occurs before the preceding steps are complete, the itinerary does not work on its published schedule. The remaining delay buffer—not the headline connection duration—is the number to assess.
Carry-on helps, but does not solve the connection
Travelling without checked luggage removes baggage reclaim and bag-drop deadlines. You may still have to pass immigration or security, and some airports do not allow airside movement between the relevant terminals or airlines.
Visa and transit rules can also change when the passenger must enter the country to collect baggage or move airports. Check the government or embassy source for the passport being used. A booking platform’s generic transit notice is not enough.
Reasonable self-transfer cases
Separate tickets can make sense when most of these are true:
- the saving remains large after bags and transfers;
- there are several affordable replacement flights;
- the buffer includes an overnight stay;
- the first flight is early in the day;
- no cruise, tour, visa appointment or long-haul departure depends on the second leg;
- the destination can absorb a late arrival;
- entry and transit rules are simple;
- each ticket remains useful on its own.
An overnight connection is not wasted if it turns a fragile itinerary into a cheap, manageable one. It can still be a poor deal once the hotel and two airport transfers are added.
Situations where a self-transfer carries higher risk
Avoid it when:
- both flights are on the same afternoon with checked luggage;
- the transfer crosses a large city between airports;
- the second flight is the last one that day;
- a missed leg cancels an expensive onward booking;
- replacement flights are rare or extremely expensive;
- the route depends on a tight visa-free transit exception;
- severe weather or strikes are already plausible;
- the saving is small.
Travel insurance does not make a short or complex connection reliable. Policies differ, exclusions matter and reimbursement after a claim does not restore the trip on the day of disruption.
Build a buffer from consequences
There is no universal safe number of hours. The buffer should grow with the cost of failure.
| Consequence of missing flight | Sensible approach |
|---|---|
| Cheap route with frequent alternatives | Same-day buffer may be acceptable |
| Expensive route with limited service | Overnight before the second flight |
| Long-haul, cruise or fixed tour | Prefer one protected booking |
| Airport change or immigration uncertainty | Large buffer or overnight |
A useful final test is whether the traveller could cover the replacement cost if the connection fails. If not, a protected through-ticket is generally the safer structure.
