Cheap Flights from London: Compare Heathrow, Gatwick, Stansted, Luton, and City
The cheapest fare from London is not always the cheapest trip. This guide shows how to compare Heathrow, Gatwick, Stansted, Luton, and London City by route coverage, likely airline mix, transfer effort, baggage, and total journey cost so you can choose the best departure airport for each search.
Overview
London is served by several airports, and flight searches can produce very different results depending on which ones you include. Heathrow and Gatwick generally offer broad destination coverage, while Stansted and Luton are important airports for comparing low-cost and short-haul options. London City can be useful for selected city-centre and business routes, although its route choice is more limited.
There is no permanent answer to the question, “Which London airport has the cheapest flights?” The result depends on your destination, dates, airline, cabin bag, checked luggage, airport transfer, and tolerance for an early departure or longer journey across the capital. A lower advertised fare can disappear once you add transport to the airport, seat selection, baggage, meals, or an inconvenient overnight stay.
| Airport | Useful comparison point | What to check before booking |
|---|---|---|
| Heathrow (LHR) | Strong option for comparing long-haul, connecting, and established full-service routes | Terminal, connection arrangements, baggage rules, and the cost of reaching the airport |
| Gatwick (LGW) | Broad mix of short-haul and international services, including leisure-focused routes | Which terminal is used, rail or coach options, and whether the fare is nonstop |
| Stansted (STN) | Important airport to include when searching short-haul and budget-airline fares | Early-morning transport, hand-luggage dimensions, and optional airline fees |
| Luton (LTN) | Another key comparison point for budget and European routes | Transfer time after arriving at the station, airport access cost, and baggage terms |
| London City (LCY) | Convenient for some central and business-oriented journeys | Limited route availability, flight times, fare flexibility, and cabin baggage rules |
These descriptions are starting points, not rankings. Airlines, schedules, terminals, and airport access arrangements change. Search all practical airports for your route, then compare the complete itinerary rather than the headline fare.
How to estimate the real cost
Use a simple total-cost calculation for every serious option:
Total trip cost = airfare + required baggage and booking fees + airport transport + overnight or meal costs caused by the schedule.
For a round trip, calculate the outbound and return airport costs separately. You might fly out of one London airport and return to another if the fare difference is meaningful, but include the extra planning and transfer cost. For a one-way journey, do not assume that a round-trip search is automatically cheaper; compare both formats using the same baggage and seat requirements. Our guide to one-way versus round-trip flights can help structure that comparison.
Search the destination across Heathrow, Gatwick, Stansted, Luton, and London City where the route makes sense. Then repeat the search with flexible dates if your plans allow it. A date change can affect the result more than changing airports, particularly around weekends, school holidays, major events, or peak business periods. See the flexible-date flight search guide for a practical way to test nearby departures.
- Record the fare and whether it is one way or round trip.
- Confirm whether the flight is nonstop or includes a connection.
- Add the baggage, seat, payment, and other charges you actually need.
- Estimate transport from your starting point to the airport and back home after arrival.
- Assign a value to difficult departure times, extra transfer risk, or a required overnight stay.
- Compare the final totals and choose the option that fits your priorities.
Inputs and assumptions
A useful comparison is only as accurate as its inputs. Before searching, write down:
- Route: destination airport or acceptable destination airports, not only the city name.
- Dates: fixed dates, a flexible window, or acceptable departure days.
- Passengers: include adults, children, and any passenger needing special assistance.
- Luggage: personal item, cabin bag, checked bag, sports equipment, or other extras.
- Flight type: nonstop only, or connections allowed with a minimum acceptable layover.
- Airport access: starting location, likely departure time, and available rail, Underground, coach, taxi, or car options.
- Flexibility: whether separate tickets, different airports, or an overnight stay are acceptable.
Use the airline’s current fare conditions for baggage and changes. A budget fare may be suitable if you travel light, but a more flexible fare can be better value when plans are uncertain. Check the total-cost flight comparison checklist before treating a search result as a deal.
Also separate airport convenience from airfare value. Heathrow may be preferable for a long-haul itinerary with a protected connection; Stansted or Luton may deserve attention for a short-haul search; Gatwick may be the practical choice when its schedule avoids a very early start; and London City may save time for travellers who can find a suitable route. These are decision rules, not guarantees of cheaper fares.
Worked examples
The following examples use illustrative figures only. Replace them with current search results and your own transport costs.
Example 1: A short-haul weekend
Suppose a traveller finds a £70 fare from Stansted and a £92 fare from Heathrow. The Stansted option requires £28 of airport transport, while Heathrow requires £12. If both fares include the same luggage, the estimated totals are £98 and £104. The cheaper advertised fare is still the lower-cost choice, but only by £6. A later departure from Heathrow might be worth that difference if it avoids an expensive taxi or lost time.
Example 2: A lower fare with extra baggage
Suppose a Luton fare is £55 and a Gatwick fare is £82. The Luton itinerary needs a checked bag and a seat selection, adding £48, plus £20 in airport transport. The Gatwick fare includes the traveller’s required bag and needs £16 of transport. The estimated totals become £123 for Luton and £98 for Gatwick. In this case, the apparently cheaper airline ticket is not the cheaper flight booking.
Reusable worksheet
Copy this structure into a note or spreadsheet for each route:
- Airport and airline:
- Flight dates and times:
- Fare type and ticket conditions:
- Base airfare:
- Baggage and seat costs:
- Transport to departure airport:
- Transport after returning to London:
- Connection, overnight, or meal costs:
- Estimated total:
- Main trade-off:
For multi-stop journeys, also compare connection length and airport changes. The flight layover guide explains how to assess convenience and connection risk alongside price.
When to recalculate
Recheck the comparison whenever the fare, schedule, baggage requirement, or airport access changes. Recalculate after changing travel dates, adding luggage, switching from nonstop to connecting flights, or choosing a different London airport. A price alert can help you monitor a route, but an alert is only useful when the tracked itinerary matches your acceptable airports and baggage needs.
Review this airport comparison before each new destination search and whenever airlines revise routes, terminals, airport charges, or public-transport arrangements. For a repeatable routine, search all five airports, fill in the worksheet, verify the airline’s current conditions, and compare total costs before booking online. If the route is to Europe, you can also use the cheap flights to Europe route-planning guide to test nearby airports and flexible dates.
The best airport is the one that gives you an acceptable combination of fare, schedule, access, baggage, and reliability. Treat the ticket price as the first input—not the final answer.
