Choose flight times by total journey cost, not airfare alone

Build a door-to-door timeline

Record when you must leave home, arrive at the airport, land and reach your accommodation. Include the airline’s recommended airport arrival time and realistic ground transport. A very early departure can shift costs to the previous evening if public transport is unavailable or an overnight stay becomes preferable. A late arrival can have the same effect at the destination.

Write each stage using local times: home departure, airport arrival, flight, border formalities, baggage and hotel arrival. On routes crossing time zones, calculate elapsed time separately. A shorter flight can still create a longer day if it uses a distant airport or an inconvenient connection.

Price the journey around the flight

Add transport to the airport, parking or drop-off costs, and onward travel from the destination airport. Use current operator information for your date and location; fares and timetables change. If travelling with others, compare the group total rather than a single passenger fare. Include necessary baggage and seat options so the flight comparison uses equivalent products.

Check transport at the required hour rather than relying on daytime fares. An early departure may need a taxi or airport hotel, while a late arrival may miss the final train. Include parking duration, tolls and any extra breakfast or dinner created by the schedule.

Value time without pretending it is cash

A direct convenient departure may save a long wait or an extra night, but that does not mean every traveller should pay more for it. Note the time difference and what it changes: a full day at the destination, a missed connection to a train or an awkward sleep schedule. Choose based on priorities, not an unsupported monetary value for an hour.

Keep two columns: money spent and usable time gained. A later flight might preserve a working day but cost another night’s accommodation. Avoid assigning an hourly wage to leisure unless that reflects a real cost, such as unpaid leave or additional childcare.

Check the arrival against accommodation rules

Confirm the hotel’s check-in window, late-arrival process and whether the room is held if you arrive after reception hours. For a morning arrival, ask about luggage storage rather than assume early room access. If the flight arrives after the final local bus, include the alternative transport in your comparison. The airline timetable does not guarantee an easy onward journey.

Ask how late check-in works and whether reception closes. For an early arrival, establish luggage-storage options and whether guaranteed room access requires booking the previous night. Do not assume a request for early check-in provides somewhere to sleep immediately after an overnight flight.

Compare realistic alternatives

Create two itineraries with the same dates and baggage: early flight plus any extra access cost, and later flight plus its ground-transport implications. A hypothetical example might find that a midday fare is higher but avoids an overnight stay; another traveller may have a lift and prefer dawn. Use your own receipts, published fares and constraints, not a generic rule.

An apparently cheaper flight can require a taxi rather than a train and an extra hotel night. Add those supporting costs before comparing with a more convenient departure. Apply the comparison per party consistently: a taxi fare shared by several people is not a per-passenger charge.

Keep the return in view

A cheap outbound departure can be offset by an expensive or inconvenient return time. Compare both ends together, especially airport parking, public transport service hours and accommodation nights. Check the current timetable close to booking and again before travel. If time is critical, allow a sensible buffer rather than treating the shortest theoretical route as guaranteed.

National Rail’s planner allows date, time, passenger and route choices and flags elements such as rail replacement services. Use the intended travel date and inspect the last practical connection. Recheck nearer departure, particularly when a missed train would require an expensive overnight alternative.

Choose the timetable you can actually use

Before paying, test the weakest link: the first train of the morning, the last shuttle at night or a hotel reception deadline. Obtain a realistic backup price for that stage. If the itinerary works only when every arrival is punctual and baggage appears immediately, the apparent saving rests on fragile assumptions. Once you choose, keep the ground-transport plan with the flight booking and set a reminder to check schedules. A slightly dearer departure can be worthwhile without pretending that comfort itself is a cash saving.