Cheap flights from London Heathrow Airport to Portugal from $144

In general, February is the cheapest month to fly from London Heathrow Airport to Portugal. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $281. If you’re not able to fly to Portugal in February, then January is your next best option. Flight prices from London Heathrow Airport to Portugal during January average around $285.

The cheapest day to depart from London Heathrow Airport to Portugal is on a Thursday. Travellers who choose to depart for Portugal on a Thursday will often find tickets for as low as $417. When flying out on a Tuesday, the most expensive travel day of the week, you can expect to see flight prices from London Heathrow Airport to Portugal for around $538.

At midday is the cheapest time of day to fly from London Heathrow Airport to Portugal when you can find flight prices for as low as $394. Flying to Portugal at midday is an ideal time because this is during off-peak travel hours. Flights in the morning are often more expensive, with an average ticket price of $565.

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

You are more likely to see cheaper flights to Portugal from London Heathrow Airport when booking weeks ahead of your departure date. In general, you can expect to find flights to Portugal for around $399 when searching weeks before you fly. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Portugal from London Heathrow Airport for as low as $348 on momondo.

There are 2 cabin classes available to choose from on London Heathrow to Portugal flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Historically, on average around 27% of flights between London and Portugal have experienced a delay on any given week. The average delay length over the past 12 months has been 106 minutes.

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

Tuesday 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.

29 flights are operational daily from London Heathrow Airport to Portugal as of March 2026. The most popular departure time for this route is 18:00, with 38% of flights per day taking off at midday.

The number of flights available between London Heathrow Airport and Portugal is 204 per week as of March 2026. The most frequent departure day is Sun, with 39% of weekly flights leaving on this day.