A round-trip flight itinerary is a travel document that shows a journey starting and ending at the same location. A standard format in 2026 usually looks like this: [Outbound] March 15, 2026: Flight AA123 departs New York (JFK) at 8:00 AM, arriving in London (LHR) at 8:15 PM. [Return] March 22, 2026: Flight AA124 departs London (LHR) at 10:30 AM, arriving back in New York (JFK) at 2:45 PM. The itinerary will typically include your Confirmation Number (PNR), flight numbers, seat assignments, and terminal information. For international trips, it also lists "layover" details if you aren't flying direct. For example, a round-trip to Paris might show a 2-hour stop in Reykjavik. Having a copy of this is essential not just for your own organization, but often for "proof of onward travel" required by immigration officers when entering a foreign country. In 2026, most travelers keep this as a digital "live" itinerary in their airline app or Apple/Google Wallet, which updates automatically if the gate or departure time changes.