Cheap flights from New Hampshire to London from £168

The cheapest month to fly to London from New Hampshire is in October. Flight prices, which tend to average around £387, are often lower during this time because this is during the off-season. The month of January is another great option to travel to London, with average flight prices from New Hampshire averaging around £390.

Our data shows that Monday is the least expensive day to fly to London. Tickets to fly out on this day can be as low as £439. When flying out on a Saturday, the most expensive travel day of the week, you can expect to see flight prices from New Hampshire to London for around £532.

The cheapest time of day to fly to London is in the afternoon when flights can be purchased for as low as £439. Flights in the morning are often more expensive, with an average ticket price of £532.

You are more likely to see cheaper flights to London from New Hampshire when booking weeks ahead of your departure date. In general, you can expect to find flights to London for around £464 when searching weeks before you fly. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to London from New Hampshire for as low as £443 on momondo.

As of March 2026, 143 flights take off from New Hampshire and land in London each week. The most common flight departure day for this route is Mon, with 22% of weekly flights taking off on this day.

Flight times from New Hampshire to London vary, but if you’re flying out of Manchester and flying into London Heathrow Airport (one of the most popular routes), then the duration is 10h 09m on average. Another popular route from New Hampshire to London is flying from Lebanon to London Heathrow Airport, which will take roughly 14h 57m. Keep in mind that layovers or delays could extend your travel time.