How to Find Cheap Flights to London: A Practical Guide
Cheap flights to London come from flexible airports, flexible dates and a watched price. Here is how to compare Heathrow, Gatwick and Stansted and spot a fare that is really low.
To find cheap flights to London, compare all of the city's airports at once, stay flexible by a few days, and watch the price from your own airport until it drops below its usual level. Most people who overpay do it by searching one airport on one date and booking the first result.
This guide walks through the method in order, from picking the right airport to checking what the final price really includes.
Search "London (all airports)", not just Heathrow
London is served by several airports, including Heathrow (LHR), Gatwick (LGW), Stansted (STN), Luton (LTN) and London City (LCY). Heathrow gets most of the long-haul traffic, but it is often not the cheapest option, and the other airports can be much cheaper on certain routes or days.
Most search engines have an "all London airports" option. Use it first, then look at which airport the cheapest fare lands at. Then check the real cost of getting from that airport into the city, because a fare that saves you a little can be cancelled out by a long, expensive transfer.
Step by step
- Pick a window, not a date. Search a span of a few days either side of your ideal departure. Moving a flight by a day or two is often the single biggest saver, and a commenter in r/Shoestring said the same about "chasing the deal, not the destination" when talking about flexible flight searches.
- Use a calendar or price graph view. Google Flights shows a date grid so you can see which days are cheaper before you commit to one.
- Check nearby departure airports. If you live between two hubs, search both. A short drive or train ride can change the fare a lot.
- Compare nonstop and one-stop fares. Nonstop is faster, but a one-stop itinerary can cost noticeably less. Decide how much time the saving is worth to you.
- Look at the total price. Add bags, seat selection and any fees on the booking page. The headline fare is only the start, and one commenter in r/Shoestring pointed out that an advertised fare rose sharply after seats were chosen.
- Set up a price watch before you buy. If your dates are not urgent, let the price come to you instead of checking every day. See the next section.
- Book with the airline or a booking site you trust, and keep the confirmation email.
Which London airport is usually the best choice?
There is no single answer, but this table shows how to think about it.
| Airport | Good for | Watch out for |
|---|---|---|
| Heathrow (LHR) | Most long-haul routes, fastest rail links into the centre | Fares and fees are often higher |
| Gatwick (LGW) | A mix of long-haul and low-cost flights | Train into central London takes longer than from Heathrow |
| Stansted (STN) | Low-cost carriers from across Europe | Longer transfer, and a bus or train fare to budget for |
| Luton (LTN) | Low-cost flights | Transfer cost and time |
| London City (LCY) | Short transfers to the business district | Few routes, often pricey |
If you fly in from Europe, the low-cost airports are worth a close look. If you cross the Atlantic, expect Heathrow and Gatwick to offer the most options, and compare them against each other.
When to book
Do not rely on a magic booking day. Fares move with demand, school holidays and events, and the cheapest day to fly is different for every route. What does work is knowing your normal price. If you have watched a route for a few weeks, you will recognise a fare that is clearly lower than usual when it appears. For longer trips from the US, our guide to finding cheap flights to Europe covers the timing question in more depth.
Watch the price from your own airport
This is where an alert helps. Cheap Flights Alert is a free service that watches fares from the departure airport you choose and messages you on WhatsApp, Telegram or email when a fare is clearly cheaper than usual. You can sign up for free alerts and pick your home airport.
A few honest limits: it does not book flights or sell tickets, it does not predict prices, and it watches fares from your airport rather than a single route you type in. If you already know your exact route and dates, a search tool such as Google Flights is the better fit, and it also lets you track prices for a route and get email updates when they change significantly. The two work well together.
You can look at live examples on the airport pages, for instance New York JFK, Boston or Chicago O'Hare. Each page shows the lowest fare found today, the 30-day low and when the data was last updated. Prices can change or sell out at any time, so the final price is always the one on the booking site.
Before you book: check entry rules
Entry rules change, and they depend on your passport. UK government guidance says many visitors need an Electronic Travel Authorisation (ETA) before travelling, which costs £20 and lasts two years or until your passport expires, whichever comes first, according to the official UK government page. Check there whether it applies to you before you pay for a ticket, because applying late could put your trip at risk.
Common mistakes to avoid
- Booking a cheap airport without checking the transfer. A cheap fare into a faraway airport can cost more once you add the train or bus.
- Ignoring baggage. Low-cost carriers often charge for anything beyond a small bag.
- Tight connections on separate tickets. If the first flight is late, the second airline does not have to wait.
- Waiting for a deal that never shows. If your trip has a fixed date, set a limit for the price you will accept and book when it is reached.
- Booking in a hurry. A commenter in r/Shoestring summed it up by saying flexibility in dates matters more than any single sale day.
Quick checklist
- Searched all London airports and compared the results.
- Tried at least three different departure dates.
- Counted bags and transfer cost in the total.
- Checked entry requirements for your passport.
- Set up an alert so you hear about a fare that is clearly lower than usual.
Sources
Frequently asked questions
- Which London airport is cheapest to fly into?
- It depends on the route and the date. Heathrow has the most long-haul options, while Gatwick, Stansted and Luton often have lower fares from Europe. Search "London (all airports)" and add the transfer cost to the fare before you decide.
- How far ahead should I book a flight to London?
- There is no universal best day. Watch the price for a few weeks so you know what is normal for your route, then book when a fare is clearly below that level, especially if your dates are fixed.
- Do I need a visa or ETA to visit London?
- It depends on your passport. Many visitors need an Electronic Travel Authorisation, which costs £20 on the UK government site. Check the official page before you buy a ticket.
- Can Cheap Flights Alert book my flight to London?
- No. It does not sell tickets or book flights. It watches fares from your chosen airport, messages you when one is clearly cheaper than usual, and sends a link so you can book with the airline or booking site.
- Is a nonstop flight to London always more expensive?
- Not always, but a one-stop itinerary is often cheaper. Compare both and decide how much extra travel time the saving is worth to you.
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