Booking.com

Alongside its accommodation listings, Booking.com sells flights in many markets, letting travellers search one-way, return and multi-city routes and keep air and hotel bookings in the same account. Results can be filtered by stops, airline, departure time and fare type, and some fares offer add-ons such as flexible tickets or extra baggage at an added cost. Flight bookings are generally handled with a partner travel provider rather than issued through the airline's own website, which matters if plans change: changes, refunds and schedule disruptions are usually processed through Booking.com's support rather than directly with the carrier. That setup suits travellers who value having flights, stays, car hire and airport taxis in one place. Before booking, compare the total fare, including bags and seat selection, against the airline's own site and check which fare rules apply.