Cheap flights from the United States to Portugal from $297

The cheapest month to fly to Portugal from United States is in January. Flight prices, which tend to average around $594, are often lower during this time because this is during the off-season. If you aren’t able to travel during the month of January, then book flights to Portugal from United States during February instead. Flights to Portugal in February, while not as cheap as those in January, still average around $618.

According to our data, Thursday is the cheapest day to fly to Portugal from United States. The lowest ticket price found for a Thursday departure recently was $554. Keep in mind that prices can always vary depending on your route and whether or not you are flying domestic or international. The most expensive day to fly to Portugal is Sunday, with ticket prices averaging around $783.

Our most recent data shows that the best time of day to fly to Portugal is in the afternoon. Flights from United States to Portugal during this time can be as low as $675. In the evening is when there is more demand to fly to Portugal, so prices are often more expensive at around $933 per ticket.

Fly from Los Angeles to Lisbon Humberto Delgado for the best United States - Portugal flight prices

You are more likely to see cheaper flights to Portugal from United States when booking weeks ahead of your departure date. In general, you can expect to find flights to Portugal for around $737 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Portugal from United States for as low as $736 on momondo.

United Airlines, KLM, and Royal Air Maroc are the most popular carriers operating from United States to Portugal

TAP AIR PORTUGAL, United Airlines and Delta are the top three most popular airlines that fly to Portugal from United States according to our data. TAP AIR PORTUGAL is the first choice among our users, with 57% of people opting to fly with this airline when traveling to Portugal. Keep in mind that there are 26 different airlines that fly to Portugal on a routine basis, so you have a few additional options to choose from.

Historically, on average around 26% of flights between United States and Portugal have experienced a delay on any given week. The average delay length over the past 12 months has been 148 minutes.

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

Monday is statistically the day of the week which experiences the fewest number of delays on this flight route. Thursday has historically seen more delays on average compared to the rest of the week.

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

As of May 2026, there are 40 flights per day flying from United States to Portugal. The most common time of day flights depart is 4:00PM, with 64% of flights taking off in the afternoon.

As of May 2026, 280 flights take off from United States and land in Portugal each week. The most common flight departure day for this route is Fri, with 19% of weekly flights taking off on this day.