United Flights from Boston (BOS) to London (LHR)

Your boarding pass usually tells you exactly which terminal your United Airlines flight will be taking off from at Boston, MA (BOS-Logan Intl.). It might also be able to give you the arrival details for London (LHR-Heathrow). If not, you could always consult your airline before you fly.

If you're traveling with United Airlines from Boston, MA (BOS-Logan Intl.) to London (LHR-Heathrow), you'll have to make at least one stop. While waiting for your next flight, take the chance to enjoy a bite to eat or go for a walk.

Bring that novel on board you've been desperate to read. A flight from Boston, MA (BOS-Logan Intl.) to London (LHR-Heathrow) with United Airlines takes roughly 9 hours and 7 minutes. You'll have more than enough time to immerse yourself in the riveting plot.

If you'd like to book a jaunt from BOS to LHR, you can choose from at least 2 United Airlines flights daily.

For more info about changing your flight to London (LHR-Heathrow), please visit our Customer Service Portal.

This just in! Airfares offered on Tuesdays tend to be the cheapest, according to flight demand on Travelocity in 2019. Wednesday and Friday prices are also good, but you may want to prepare your budget if booking on a Monday, as data shows the start of the week is when prices are generally at their highest.

Frequent travelers may already know this, but earlier in the week can be the cheapest time to fly. In 2019, flights departing on a Tuesday were generally the cheapest of the week, whereas you may pay a premium for weekend flights when demand is usually high. On average, tickets were most expensive for Saturday departures, so if you need to fly out on a weekend, you might look for deals ahead of time.

Trying to figure out how early you should book your flight? It's possible to start comparing international airfares on Travelocity up to 12 months in advance. However, it does depend on the carrier as not all airlines release their prices that far out. According to our 2019 flight demand trends, last minute planners can still bag a bargain with some of the cheapest fares appearing 1-2 weeks prior to their travel dates.

We'll let you in on a secret...You can save big on flights if you mix and match your airlines and fare types. In fact, travelers who booked flights on Travelocity in 2019 saved nearly 50% when their return flights consisted of two different airlines or fare types.

*According to flight demand on Travelocity.com from January to December 2019. Savings are subject to change based on departure location, date and destination.