Flights are automatically merged into trips if the arrival airport is the same as the departure airport, and the layover time is less than 12 hours. If the layover is more than 12 hours, you can merge them manually.
You may want to merge two flights that are parts of the same trip (e.g. Singapore>Hong-Kong>Tokyo).
Tap “Edit” at the top left-hand corner on the main screen.
Then select the flights and tap the Merge icon arrows on the bottom bar.
Tap and hold on the flight you want to merge, then select the other one. Tap on a "Merge" button at the top.
You can easily split flights.
Swipe left, the flight you want to split.
Then tap on the green button to split.
Tap and hold the flight you want to split, and then select "Split" button at the top.
P.S. It will soon be possible to merge flights when the arrival airport on the 1st trip leg differs from the departure airport of the 2nd leg (e.g. Oslo Airport in Oslo — Heathrow Airport in London; Gatwick Airport in London — Portela Airport in Lisbon). If you want to be notified when we release this feature, fill this form, please.