Cheap flights from Portugal to London from £34

In general, January 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 £141. The month of February is another great option to travel to London Heathrow Airport, with average flight prices from Portugal averaging around £146.

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 £214. However, this price may fluctuate depending on the airline, the season, and holidays. Be sure to avoid booking your departure on a Monday as prices are generally higher than usual. According to our data, the average ticket price to London Heathrow Airport on Monday is £326.

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 £181. 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 £278 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 Faro 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 £185 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 £139 on momondo.

There are 3 cabin classes available to choose from on Portugal to London Heathrow 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 26% 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 110 minutes.

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

Wednesday is statistically the day of the week that experiences the fewest delays on this flight route. Thursday 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 22% of their flights experiencing any sort of delay.

The number of flights available between Portugal and London Heathrow Airport is 51 per day as of March 2026. The most frequent departure time is 18:00, with 36% of daily flights leaving in the afternoon.

357 flights are operational weekly from Portugal to London Heathrow Airport as of March 2026. The most popular departure day for this route is Fri, with 20% of flights per week taking off on this day.