What "proof of onward travel" means
Some countries expect visitors to show they plan to leave — a return flight home, or an onward flight to another country. Airlines check entry rules at check-in, so you can be asked at the departure airport, not just on arrival.
Examples from official travel advice
The UK government's travel advice (checked 6 October 2026) includes:
- Thailand: GOV.UK lists "evidence of onward or return travel" among what UK visitors need, and notes that "British nationals have been refused entry for failing to provide this evidence."
- Philippines: "Most UK visitors are also expected to have proof of return or onward travel. Immigration officials and airlines may ask for this."
These pages are written for UK nationals. Rules depend on your nationality and change over time, so check your own government's travel advice and the destination's official immigration site before you fly.
When a reservation is not enough
Some countries or airlines may require a paid, ticketed onward flight rather than a reservation. If the official rule for your trip says the ticket must be paid or issued, buy a real ticket — ideally a refundable or flexible fare — instead of a reservation. We'd rather you check than get turned away at the gate.
What you get
- A one-way reservation leaving your destination on the date you choose
- Your name exactly as on your passport, and a booking reference (PNR)
- A PDF by email, kept in your dashboard
Unpaid reservations are held for a limited time set by the airline, so order close to your travel date. See how to check a reservation with its PNR.
Applying for a visa instead?
If you need documents for a visa application rather than a border check, see our flight reservation page and visa guides.