How Do I Find Cheap Flights to London From the US in 2026?

Both cities have nonstop service from the US every day on several airlines, and their fares swing a lot by season, which makes timing your best tool. KAYAK puts the average US round trip at about $901 to London and about $903 to Paris over the past 12 months, so a fare well under that is a real saving.

ShopBack US is a free app and website for shopping and booking online. You start your booking from the store's page on ShopBack, book on the store's own site as usual, and part of what you paid comes back as cash. Sign up for ShopBack US before you book your next flight to Europe.

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How do I find cheap flights to London from the US?

Cheap flights to London come from four choices: when you fly, when you book, which airport you leave from, and where you book.

Work through the booking like this:

1. Pick a low-season month if you can. On KAYAK's data for the past 12 months, at the time of writing, February was the cheapest month to fly from the US to London at about $666 round trip on average. June and July were the most expensive.
2. Book about 5 weeks ahead. KAYAK says booking around 5 weeks before departure has typically cost about 7% less than booking within 2 weeks of the flight.
3. Check more than one departure airport. Round trips from Houston Hobby averaged about $629 and from New York about $683, well below the national average of about $901.
4. Be flexible on day and time. Wednesday departures averaged the least and Saturday the most, and morning flights were cheaper on average than afternoon flights.
5. Track the route. Google Flights, for example, emails you when a tracked route's price changes significantly.
6. Compare the same itinerary on Trip.com, Expedia and Priceline, then book through ShopBack. Open the store on ShopBack US first, tap through, and book.

KAYAK treats a London round trip under about $690 as a good deal, since a quarter of its users found fares at or below that level.

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How do I find cheap flights to Paris from the US?

Cheap flights to Paris come from the same playbook as London, with one difference: January, not February, has been the cheapest month. On KAYAK's 12-month data at the time of writing, January round trips from the US to Paris averaged about $629, while June (about $1,161) and July (about $1,080) were the priciest.

A few Paris-specific points:

• Booking about 5 weeks ahead has typically run about 9% cheaper than booking last minute, according to KAYAK.
• Monday departures averaged the least on KAYAK and Saturday the most, and night flights were the cheapest time of day on average.
• New York is the cheapest major gateway on KAYAK's averages, at about $706 round trip, with Boston at about $821.
• Know the airports. KAYAK describes Paris Charles de Gaulle (CDG) as the largest international hub for Paris and France. Paris Orly (ORY) also has some flights from the US, including some of the lower fares KAYAK lists from Newark, so search all Paris airports.
• A good Paris fare is under about $680 round trip on KAYAK's measure.

Air France runs the most flights between the US and Paris on KAYAK's recent data, and Delta and other airlines also fly nonstop.

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Flights to London in 2026: the numbers that matter

For 2026 planning, the London numbers worth knowing are the average fare, the cheapest and dearest months, and the nonstop options. According to KAYAK's data for the past 12 months, at the time of writing:

Flights from the US to London	KAYAK figure
Average round trip	About $901
Cheapest month	February, about $666
Most expensive months	June (about $1,236) and July (about $1,085)
Cheapest day to fly	Wednesday
Most expensive day to fly	Saturday
Best booking window	About 5 weeks ahead, about 7% below last minute
Good-deal threshold	Under about $690 round trip
Average nonstop flight time	About 8 hours 18 minutes

British Airways runs the most flights on the route on KAYAK's recent data, at about 300 a week, and American Airlines and others also fly nonstop. London has several airports, so search "London (all airports)" rather than one airport. Heathrow and Gatwick both have flights from the US, and some of the low fares KAYAK lists land at Gatwick.

Flights to Paris in 2026: the numbers that matter

Paris fares in 2026 have tracked London closely, just with a slightly earlier cheap season. According to KAYAK's 12-month data at the time of writing:

Flights from the US to Paris	KAYAK figure
Average round trip	About $903
Cheapest month	January, about $629
Most expensive months	June (about $1,161) and July (about $1,080)
Cheapest day to fly	Monday
Most expensive day to fly	Saturday
Best booking window	About 5 weeks ahead, about 9% below last minute
Good-deal threshold	Under about $680 round trip
Average nonstop flight time	About 8 hours 25 minutes

These are averages, so treat them as a yardstick for your own dates.

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Cheapest month for flights to London and Paris: the price data

The cheapest month to fly from the US to London has been February, and to Paris January, on KAYAK's 12-month price data at the time of writing. Both cities are also quietest in winter. KAYAK marks February as low season for both, with an average 47% drop in travelers to London and 44% to Paris, while the busiest months are June for London and May for Paris.

If your dates are flexible, moving a trip from June to late winter is usually the biggest single saving; if they are fixed, the savings come from the booking window, the airport and the booking site. For more on seasonal timing across routes, see the cheapest month to buy plane tickets.

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Best deals on flights to London and Paris from the US

The best flight deals to London and Paris usually show up as low base fares on specific dates, not as public promo codes.

• Look at the whole cost. Some low fares leave out checked bags, seat choice or meals.
• Price a package if you need a hotel. Priceline says its package savings compare a flight and hotel booked together with the same flight and hotel booked separately on priceline.com, and that savings vary.
• Know your cancellation rights. Under US Department of Transportation rules (14 CFR 259.5), airlines covered by the rule must let you hold a reservation at the quoted fare without paying, or cancel it without penalty, for at least 24 hours after booking, if you book a week or more before departure. If you book through a booking site, check that site's own cancellation terms.
• Plan the trip, then book through ShopBack. Once you have the fare you want, open the store on ShopBack US and book from there.

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Expedia vs Priceline for flights to London and Paris

Expedia and Priceline often show similar fares for the same flight, so the real comparison is the total trip cost and the booking terms. Both sell flights on their own or bundled with a hotel, and both are on ShopBack US, along with Trip.com.

What to compare	Why it matters
Same flight numbers and times	Makes sure you compare like with like
Bags and seat fees	Can change the cheapest option on a transatlantic trip
Change and cancellation rules	Set by the fare and the booking site
Flight plus hotel price	Packages can price differently from separate bookings
What ShopBack returns on the booking	Lowers the effective price; check each store's ShopBack page

A simple routine: search the identical itinerary on Expedia, Priceline and Trip.com, note the total for the fare you actually want, then book the winner through ShopBack US. Flights, hotels and packages can be treated differently.

Expedia, Priceline and Turkish Airlines: other ways to London and Paris

Turkish Airlines is the main one-stop alternative to a nonstop flight, routing US travelers through its hub at Istanbul Airport. According to Turkish Airlines' investor relations site, the airline ranks first in the world by number of countries flown to. A trip via Istanbul takes longer than a nonstop to London or Paris, so it usually only makes sense when the fare gap is big or you want a stop in Istanbul.

Booking sites such as Trip.com, Expedia and Priceline sell many airlines in one search, while airlines such as British Airways, Air France, Delta and Turkish Airlines sell their own fares. Check both for the same flight. Turkish Airlines also has a store page on ShopBack US.

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What US travelers need before flying to London or Paris

Most US visitors to the UK now need an electronic travel authorisation (ETA) before they fly, and France uses the EU's new biometric border checks.

• UK ETA: according to GOV.UK at the time of writing, an ETA costs £20, lets you visit the UK for up to 6 months, and is needed by each traveler, including babies and children. Apply on GOV.UK itself; GOV.UK warns that other websites may charge more.
• France (Schengen area): the European Commission says the Entry/Exit System became fully operational on 10 April 2026. It registers non-EU visitors' fingerprints and facial image at the border and replaces passport stamping, so allow time at passport control on your first entry.

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How ShopBack lowers what you pay for flights

ShopBack is a post-purchase discount: go through it before you pay and the effective price drops. You book on Trip.com, Expedia or Priceline exactly as you normally would. The only change is where you start.

Cashback lowers what you actually pay for an order. It comes back as cash, so it works like a discount on the price, not like points or miles.

Check the live rate on the store's ShopBack page before you book, since it changes by store and campaign.

How to do it:

1. Find your fare and dates using the steps above.
2. Sign in to ShopBack US on the web or in the app.
3. Open the Trip.com, Expedia or Priceline page on ShopBack.
4. Tap through and book, without detouring to coupon sites or other browser extensions.

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Frequently asked questions

How do I find cheap flights to London from the US?

Fly in the low season, book about 5 weeks ahead, and compare the same itinerary across several booking sites before you pay. According to KAYAK's data for the past 12 months, at the time of writing, February is the cheapest month to fly from the US to London (about $666 round trip on average), and booking about 5 weeks out has run around 7% cheaper than booking within 2 weeks of the flight. Then go through ShopBack US before you pay so the effective fare drops.

How do I find cheap flights to Paris from the US?

Use the same method as London, with different months. According to KAYAK's data for the past 12 months, at the time of writing, January is the cheapest month to fly from the US to Paris (about $629 round trip on average), June and July are the priciest, and booking about 5 weeks ahead has run around 9% cheaper than booking last minute. Compare Trip.com, Expedia and Priceline on the same flights, then book through ShopBack US.

What is the cheapest month to fly to London from the US?

February, on KAYAK's 12-month data at the time of writing, with an average round trip of about $666. June (about $1,236) and July (about $1,085) were the most expensive months. February is also London's low season on KAYAK, with an average 47% drop in travelers.

What is the cheapest month to fly to Paris from the US?

January, on KAYAK's 12-month data at the time of writing, with an average round trip of about $629. June (about $1,161) and July (about $1,080) were the most expensive months, and May is Paris's busiest month for travelers on KAYAK.

How far ahead should I book flights to London or Paris?

About 5 weeks before departure is the sweet spot on KAYAK's data for both cities. Booking in that window has typically cost about 7% less for London and about 9% less for Paris than booking within 2 weeks of the flight. For peak summer or holiday dates, start watching fares earlier so you can act when a good fare shows up.

Which US airports have the cheapest flights to London and Paris?

East Coast and Texas gateways usually run cheapest. On KAYAK's 12-month data at the time of writing, round trips to London averaged about $629 from Houston Hobby and $683 from New York, and round trips to Paris averaged about $706 from New York and $821 from Boston. If you live far from these airports, price a cheap domestic hop to one of them against a connecting fare from home.

Is Expedia or Priceline cheaper for flights to London and Paris?

Neither is cheapest every time. Fares for the same flight often land close together, and the difference usually comes from bags, seats, change rules and whether you add a hotel. Priceline says its package savings compare a flight and hotel booked together with the same flight and hotel booked separately on priceline.com. Price the identical itinerary on Expedia, Priceline and Trip.com, then book the winner through ShopBack US.

Can I fly Turkish Airlines from the US to London or Paris?

Turkish Airlines sells one-stop trips from the US through its hub at Istanbul Airport, and the airline says it flies to more countries than any other airline. A routing through Istanbul is longer than a nonstop, so it tends to make sense only when the fare gap is large or you want a stop in Istanbul. Compare it against nonstop options on the same dates.

What do US travelers need to enter the UK or France in 2026?

For the UK, US visitors usually need an electronic travel authorisation (ETA), which costs £20 per person on GOV.UK at the time of writing and covers visits of up to 6 months; babies and children need their own. For France and the rest of the Schengen area, the EU's Entry/Exit System has been fully operational since 10 April 2026 and records fingerprints and a facial image at the border instead of a passport stamp.

How does ShopBack lower what I pay for flights to London or Paris?

ShopBack is a post-purchase discount: go through it before you pay and the effective price drops. Cashback lowers what you actually pay for an order. It comes back as cash, so it works like a discount on the price, not like points or miles. Plan the trip, then book through ShopBack: open the Trip.com, Expedia or Priceline page on ShopBack US, tap through and book. The live rate is on each store's ShopBack page.

Can I use a promo code on Trip.com and still get Cashback through ShopBack?

No. If a Trip.com code is worth more to you than what comes back through ShopBack, use the code; otherwise book through ShopBack without one.

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Key takeaways

• On KAYAK's 12-month data, February is the cheapest month for London and January for Paris; June and July are the priciest for both.
• Book about 5 weeks ahead: that window has run about 7% (London) and 9% (Paris) below last-minute fares.
• Compare the identical itinerary on Trip.com, Expedia and Priceline, including bags and change rules.
• Budget £20 per person for a UK ETA, and expect biometric checks under the EU's Entry/Exit System in France.
• Plan the trip, then book through ShopBack: open Trip.com, Expedia or Priceline on ShopBack US, tap through, then pay.

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Related reads

• How Do I Find Cheap Flights in 2026?
• What's the Cheapest Month to Buy Plane Tickets in the US?
• What's the Cheapest Day to Buy Flights in the US?
• Trip.com Discounts and Deals

Book through ShopBack US: Trip.com · Expedia · Priceline

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Disclaimer

The views in this article are those of the author and are for general information only. This article is not affiliated with or endorsed by KAYAK, Trip.com, Expedia, Priceline, Turkish Airlines or any airline named. Fare averages are KAYAK's published figures for the past 12 months at the time of writing, and entry rules are as published by GOV.UK and the European Commission at the time of writing; fares, fees and rules change, so check each source before you book. Rates on ShopBack vary by store and campaign; check the current rate on each store's ShopBack page before you pay.