Flights to London in 2027: When to Go, Where to Land, and What to Pay

London's one overnight flight away for a lot of us. The hard part is getting there without blowing half your trip budget on the ticket.

Here's the thing. Your fare mostly comes down to three choices: when you go, how early you book, and which airports you fly between. Get those right and you keep hundreds in your pocket.

So we dug through RatePunk's fare data and sorted out all three for you. Think of this as the cheat sheet a well-traveled friend would hand you before you book.

In this guide:

• What a Good Fare Looks Like
• The Cheapest Months to Fly
• What Holidays Do to Fares
• Flying in Summer
• When to Book
• Choosing a London Airport
• One-Way Tickets vs Round Trip
• Choosing a Departure Airport
• Nonstop or Connecting Flights
• Frequently Asked Questions

What a Good Fare Looks Like

A good round trip to London runs $506 or less. Keep that number in your back pocket, and you'll know a deal the second it pops up.

A fare at that price is cheaper than nine in ten of the round trips to London we tracked. The usual round trip, for comparison, was $714.

Your home airport moves that line a lot. Here's roughly what a good round trip to London looked like from some of the biggest U.S. cities:

• Orlando: $370
• New York: $380
• Boston: $405
• Miami: $515
• Washington, D.C.: $520
• Atlanta: $535
• Chicago: $540
• Denver: $545
• Houston: $555
• Los Angeles: $570
• San Francisco: $590
• Dallas: $615

Don't see your city? Use the price for the big airport closest to you.

The month matters just as much. A good fare in January and a good fare in July are two very different animals, so find the best prices by month in the table below.

The Cheapest Months to Fly

February and January are the cheapest months to fly to London from the U.S. Both came in nearly 10% under the average price of all London fares we tracked.

• February: 9.8% below the usual fare
• January: 9.7% below the usual fare
• March: 6% below the usual fare

Can't swing winter? Fall is your second shot at a bargain. September, October, and November all landed a little under the usual fare. And a crisp October week in London is a pretty great consolation prize.

From April on, fares start climbing. December runs 18% above the usual fare, and summer is the priciest stretch of all.

Bottom line: Pick your month first. Nothing else you choose moves the price as much.

Round-trip fares from the U.S. to London by departure month, compared with the usual fare for the year. February was 9.8% below usual and January 9.7% below, followed by March at 6% below, September at 4.3% below, October at 2.7% below, and November at 0.1% below. April was 4.8% above usual, December 18%, May 26%, and August 29%. June was 68% above, and July was highest at 73% above.

What Holidays Do to Fares

Christmas and New Year see the biggest holiday jump in fares to London. Holiday departures ran 81% above other December and January dates. That's about $535 more for a round trip.

Easter fares are a pleasant surprise. Flights over Easter week came in 4.6% below other dates in March and April, so a spring trip over the holiday didn't cost any extra.

U.S. long weekends are more of a mixed bag. Here's how each one stacked up against the week before it:

• Thanksgiving: 6.7% more, and 11% more than the week after
• Presidents' Day: 1.7% more, and the same as the week after
• Memorial Day: 26% more, but only 4.8% more than the week after

Memorial Day is when summer prices kick in, so waiting a week won't save you much. Over Thanksgiving, though, shifting your trip by a week is the easy win.

Flying in Summer

Summer is the priciest time to fly to London, no way around it. If summer's your only window, go in August and skip June and July, if you can.

Here's how each summer month stacked up against the usual fare for the year:

• June: 68% more
• July: 73% more
• August: 29% more

Got a little wiggle room? May came in only 26% above the usual fare, and September landed 4.3% below it.

When to Book

The best time to book flights to London is one to four months before you fly. In that window, fares to the UK sat at or just under the usual fare for the same route and month.

Here's how fares at each booking distance compared with the usual fare for the same route and month:

• Last 3 days: 15% more
• 4 to 7 days out: 8.5% more
• 1 to 2 weeks out: 5.2% more
• 3 weeks to 2 months out: about the usual fare
• 2 to 3 months out: 1.5% less
• 3 to 4 months out: about the usual fare
• 4 to 6 months out: 4.8% more
• 6 to 10 months out: 36% more, on fewer routes

Two to three months out came in a little cheaper still, but anywhere in that window is fine. Leave it to the last week and you'll pay for it. Book super early and, funnily enough, you'll pay for that, too.

Booking at least a week ahead also gets you a nice safety net. The U.S. Department of Transportation says airlines must let you cancel within 24 hours for a full refund, or hold the fare for 24 hours. That's as long as you book seven or more days before you fly.

So if a cheaper fare pops up the next morning, you're not stuck.

Round-trip fares from the U.S. to the UK by how far ahead they were seen, compared with the usual fare for the same route and month. Two to three months out was lowest at 1.5% below usual, one to one and a half months 0.4% below, one and a half to two months 0.3% below, and three to four months 0.1% below. Three to four weeks out was 0.2% above usual, two to three weeks 3.2%, four to six months 4.8%, one to two weeks 5.2%, four to seven days 8.5%, and zero to three days 15%. Fares seen six to ten months out were highest at 36% above usual.

Choosing a London Airport

Gatwick is usually the cheaper airport into London. From the same U.S. airport, Gatwick fares ran 27% below Heathrow, or about $200 less for a round trip.

Gatwick came out cheaper than Heathrow from 72% of the U.S. airports we compared, so be sure to check it.

Don't expect the same savings at London's smaller airports. Luton, Stansted, Southend, and London City usually cost more than Heathrow from the same U.S. airports.

London also beats the rest of the UK. Next to a round trip to London, other big cities cost more:

• Edinburgh: 14% more
• Glasgow: 14% more
• Manchester: 22% more

Dreaming of Scotland? Look into flying into London first. That could keep the transatlantic fare lower, and let you sort out the rest once you're on the ground.

One-Way Tickets vs Round Trip

Two one-way tickets cost a lot more than a round trip to London. If you're crossing the Atlantic, separate one-ways are the pricey way to do it.

Flying into London and home from Edinburgh on two one-way tickets cost about $410 more than a round trip into London. Ouch. That's 57% more, and it never came out cheaper from any of the 22 U.S. airports we compared.

Here's how the other combos stacked up against a round trip into the first city:

• London both ways on two one-ways: 53% more
• Into London, home from Manchester: 59% more
• Into Edinburgh, home from London: 41% more
• Into Manchester, home from London: 23% more

Doing London and Scotland in one trip? Stick with a round trip, or look at a multi-city ticket, where the airline sells the whole route as one booking.

Choosing a Departure Airport

Orlando is the cheapest big U.S. city to fly to London. Fares there ran 40% below the usual London fare, so if you live nearby, lucky you.

New York and Boston come next, at 25% and 19% below the usual London fare. Miami, Houston, San Francisco, Washington, Los Angeles, Chicago, and Atlanta all sat a little under the usual London fare. Dallas was the most expensive of the big cities we looked at, at 23% above the usual London fare.

The airport inside the city also makes a difference:

• New York: JFK ($512) beat Newark ($569)
• Washington: Dulles ($676) beat Baltimore ($759) and Reagan National ($786)

Live within driving distance of two airports? Always price both. The chart below shows the ten cheapest big cities.

Usual round-trip fares to London from the 10 cheapest big U.S. cities. Orlando was $431, New York $535, Boston $579, Miami $648, Houston $676, San Francisco $679, Washington, D.C., $688, Los Angeles $696, Chicago $699, and Atlanta $712.

Nonstop or Connecting Flights

Nonstop flights to London cost a little more than connecting ones. On the same route and dates, the cheapest nonstop usually ran about $60 more, and nonstop flights were actually the cheaper pick 21% of the time.

Flying into Heathrow, nonstop flights usually cost about $65 more than connecting ones on the same route and dates.

On an overnight flight across the Atlantic, that small amount of extra money buys you more sleep and fewer hours wandering a layover airport.

Frequently Asked Questions

How much does a flight to London cost?

A round trip from the U.S. to London usually runs about $714, and anything around $506 or less is a good fare.

Where you leave from makes a big difference, though. The usual round trip was $431 from Orlando but $878 from Dallas.

What is the cheapest month to fly to London?

February is the cheapest month to fly to London from the U.S., at 9.8% below the year's usual fare. January is right behind it at 9.7% below.

July's the one to dodge, at 73% above the usual fare.

What day of the week is cheapest to fly to London?

Tuesday and Wednesday are the cheapest days to fly to London, at 1.6% and 1.5% below the usual fare on the same route.

Saturday (5.3% above) and Friday (3.2% above) cost the most. Honestly, those gaps are tiny next to the swing between months, so pick your month first and then the day.

Which airlines have the cheapest flights to London?

Icelandair and Norse Atlantic are worth a look. Both showed up more often among the cheapest fares on each route than among fares overall.

JetBlue and British Airways turned up among the cheapest fares about as often as they did overall. Prices shift by route, so compare a few airlines.

Does the length of your trip change the price of a flight to London?

Trip length barely changes the price of a flight to London. On the same route and month, stays from five nights up to a month or more all landed at the usual fare.

Very short trips of one to four nights cost about $7 more than the usual fare. So book the trip you actually want, whether that's a long weekend or a whole month.

Do U.S. citizens need an ETA to fly to the UK?

Yes, U.S. citizens need an electronic travel authorisation (ETA) before flying to the UK, unless they also hold a British or Irish passport. The ETA costs £20, and you apply online at gov.uk or in the UK ETA app.

You'll usually hear back within a day, but it can take up to 3 working days, so don't leave it to the night before your flight. An ETA lasts 2 years or until your passport expires, for visits of up to 6 months. Everyone traveling needs one, babies and kids included.

The UK also charges Air Passenger Duty on flights leaving the country. For the U.S., the economy rate is £102, rising to £105.33 in April 2027. You don't pay it separately, because it's already included in the price of your flight home.

How We Got These Numbers

We used round-trip economy fares between U.S. airports and London that RatePunk saw in flight searches, mostly three weeks to four months before departure. The city, booking-distance, and one-way comparisons also include other UK airports. The usual fare is the median, so half the fares were cheaper and half cost more. August had fewer fares than other months, so treat its numbers as a rough guide. The ETA and Air Passenger Duty come from the UK government, and the 24-hour rule from the U.S. Department of Transportation. These are prices shown in searches, not prices anyone paid.

About RatePunk

Reading fares and understanding what makes them move is our area of expertise, and the prices in this article come from our own flight data. We run RatePunk Flights, a paid membership that watches prices out of the airport you fly from. When a route drops well below what it normally costs, the deal shows up in your app and on your dashboard, so you can book it wherever you like, with the airline itself or a travel site you already use.

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