Cheap flights from Portugal to London from £49

In general, December is the cheapest month to fly from Portugal to London Heathrow Airport. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around £26. The month of February is another great option to travel to London Heathrow Airport, with average flight prices from Portugal averaging around £45.

On average, the least expensive day to fly to London Heathrow Airport from Portugal is on a Saturday. momondo users have found tickets for Saturday departures for as low as £216. However, this price may fluctuate depending on the airline, the season, and holidays. Be sure to avoid booking your departure on a Sunday as prices are generally higher than usual. According to our data, the average ticket price to London Heathrow Airport on Sunday is £321.

According to our data, the cheapest time of day to fly to London Heathrow Airport is in the evening. momondo users have found flights departing from Portugal to London Heathrow Airport in the evening for as low as £189. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. If you have a flexible travel schedule, then try to avoid flying in the morning when prices are £281 on average. Flights to London Heathrow Airport from Portugal in the morning are generally more expensive because this time of day is more convenient for travellers’ schedules.

Fly from Lisbon Humberto Delgado to London Heathrow for the best Portugal - London Heathrow flight prices

You are more likely to see cheaper flights to London Heathrow Airport from Portugal when booking weeks ahead of your departure date. In general, you can expect to find flights to London Heathrow Airport for around £184 when searching weeks before you fly. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to London Heathrow Airport from Portugal for as low as £137 on momondo.

Historically, on average around 24% of flights between Portugal and London have experienced a delay on any given week. The average delay length over the past 12 months has been 107 minutes.

Generally, flights departing in the morning tend to experience fewer delays. Flights departing in the early afternoon have, in the past, seen delays more frequently in comparison.

Saturday is statistically the day of the week that experiences the fewest delays on this flight route. Sunday has historically seen more delays on average compared to the rest of the week.

According to our data, British Airways have had the fewest delays on this route over the last 12 months, with about 20% of their flights experiencing any sort of delay.

The number of flights available between Portugal and London Heathrow Airport is 47 per day as of May 2026. The most frequent departure time is 16:00, with 39% of daily flights leaving at midday.

329 flights are operational weekly from Portugal to London Heathrow Airport as of May 2026. The most popular departure day for this route is Mon, with 24% of flights per week taking off on this day.