Portland to London Heathrow Flights (PDX to LHR): Nonstop, Flight Time and Arrival Tips

British Airways flies it nonstop; everyone else connects

As of recent schedules, British Airways operates the only regular nonstop between Portland and London Heathrow, an overnight flight that leaves in the afternoon or evening and lands in London the next morning or around midday. The frequency has varied by season, so if your dates fall in winter check whether it is daily. American sells the same flight under its partnership with British Airways, and Alaska members can earn and redeem on it through the oneworld alliance.

If the nonstop is full or expensive, a one-stop itinerary is easy to build. Delta connects through Seattle, Minneapolis, Detroit, Atlanta or New York JFK, and its partner Virgin Atlantic flies the Atlantic leg from several of those; KLM connects through Amsterdam using Delta's Portland to Amsterdam flight. United routes through San Francisco, Denver, Chicago, Washington Dulles or Newark. Icelandair's seasonal Portland to Reykjavik flight connects to London with a short stop. Air Canada through Vancouver or Toronto is a further choice, with the convenience of clearing US customs in Canada on the way home.

Flight time and distance

Portland to London is roughly 4,900 miles (about 7,900 km). The nonstop takes about 9.5 to 10.5 hours eastbound, helped by the jet stream. The return is slower, typically 10.5 to 11.5 hours, leaving London around midday and landing in Portland in the early afternoon of the same day.

With one connection, plan on 12 to 15 hours eastbound and 14 to 17 hours coming home. The Icelandair routing tends to be at the shorter end of that because Reykjavik sits almost on the direct path.

Leaving from Portland International

PDX has a single terminal with concourses B to E, and its rebuilt main terminal hall opened in 2024 with the wooden roof that has become the airport's signature. British Airways departs from the international gates on the D or E side; Delta, Alaska and United use the main concourses for their domestic first legs. Security is divided into two checkpoints, and the TSA lines are shortest in the middle of the day.

MAX Red Line light rail runs from downtown Portland to a station a few steps from the terminal in about 40 minutes, and is cheaper and often faster than a car at rush hour. For the British Airways flight, three hours ahead is comfortable if you are checking bags; two hours is enough for a domestic first leg.

Arriving at Heathrow and getting into London

Heathrow has four terminals in use. British Airways arrivals from Portland normally use Terminal 5, the airline's home terminal, though some BA long-haul flights use Terminal 3. Virgin Atlantic and Delta use Terminal 3, United uses Terminal 2 and American uses Terminal 3. Confirm your terminal the day before, because it determines which station you walk to.

Immigration at Heathrow uses e-gates for US passports, which keeps arrival fast outside the early-morning bank of flights. Into central London:

• Elizabeth line: from all terminals to Paddington in about 30 minutes and on through the West End, the City and Canary Wharf, with no change. Good value and plenty of luggage space.
• Heathrow Express: nonstop to Paddington in about 15 minutes, the fastest but most expensive option. Advance tickets bought weeks ahead are much cheaper.
• Piccadilly line (Underground): about 50 to 60 minutes to the centre, cheapest, but crowded and awkward with bags.
• Taxi or ride-share: 45 to 90 minutes depending on traffic, worth it mainly for groups or late arrivals.

Tap in and out with a contactless card or phone on the Elizabeth line and Underground; daily fare caps apply automatically.

When to fly and when to book

London is busiest from June to August and in the weeks around Christmas. Summer brings Wimbledon in late June and early July, school holidays and the highest fares from Portland. Late April and May, and September and October, offer mild weather, long days in spring and quieter streets, with fares that are usually noticeably lower. November, January and February are cold and dark but cheap, and the theatres, museums and restaurants do not care about the weather.

Because the nonstop is the only direct option, its seats are the first to go for summer and Christmas. Book three to five months ahead for those periods and six to ten weeks ahead otherwise. If the nonstop is pricey, the one-stop routings through Seattle, Amsterdam or Reykjavik are often the best value.

Entry requirements and documents

The United Kingdom now requires US passport holders to hold an Electronic Travel Authorisation (ETA) before travelling, applied for through the official UK ETA app or GOV.UK. Approval usually comes quickly but can take a few days, and the airline checks it before you board in Portland. Your passport should be valid for the whole stay. Rules change, so confirm the current requirement on GOV.UK rather than on third-party sites before you book.

Time zones and jet lag

London is eight hours ahead of Portland for most of the year. Both places observe daylight saving, but the UK and the US switch on different dates, so the gap is briefly seven or nine hours in March, late October and early November. Eastbound you lose most of a night of sleep and arrive in the morning; staying outdoors in daylight and holding out until a local bedtime resets most people in two days. Westbound you land in the early afternoon after a long day and will wake early for a few mornings back home.

What travellers on this route get wrong

The most common mistake is not knowing which Heathrow terminal they land at and booking a hotel transfer or onward train from the wrong station. The second is paying full price for the Heathrow Express at the gate when the Elizabeth line is a few minutes slower and a fraction of the price, or when an advance Express ticket would have cost far less. The third is forgetting the ETA until the airline asks for it at check-in.