Flights from Seattle to Lisbon
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Cheap Flights from Seattle to Lisbon

Track economy fares on the SEALIS route and get alerts when prices drop.

From
Seattle
SEA
To
Lisbon
LIS

Route Intelligence: SeattleLisbon

Flight Duration

17 hr 30 min (1 Stop)

Price Guidance

A good deal is under $650 roundtrip. Standard fare is $900-$1,200+.

Peak Season

June to August

Top Airlines

TAP Air Portugal, Iberia, United Airlines

Booking Tip

Book 3-5 months in advance for best fares, as most routings connect through Lisbon or Madrid. Traveling in shoulder season (April-May or September-October) can save $200-$400 compared to peak summer prices.

Track SeattleLisbon Fares

Set your target price and FlightKitten will scan this route twice daily. The instant economy fares drop below your budget, you'll get an email with the price, airline, and a direct booking link.

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Flying Business Class?

If you're considering business class on this route, BusinessClassSignal.com is a dedicated tool that tracks premium cabin fares. They alert you when business & first class prices drop — worth checking out if you fly up front.

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Other Routes to Lisbon

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Route Briefing: Seattle to Lisbon

Seattle and Lisbon share more than you might expect — both cities are draped over hills, shaped by the sea, and home to people who take their coffee seriously. That transatlantic kinship makes this route feel less like a culture shock and more like a warm handshake with a city that somehow feels both ancient and effortlessly cool.

Getting there takes around 17 and a half hours with one stop, with TAP Air Portugal, Iberia, and United among the carriers serving this route. TAP is worth considering since Lisbon is their home hub — service tends to be attentive and connections smooth. A roundtrip under $650 is genuinely a good deal here; standard fares climb to $900 and well beyond, so when you spot something in that lower range, move quickly. Booking three to five months ahead gives you the best shot at those prices, and if your schedule has any flexibility, shoulder season travel in April, May, September, or October can shave $200 to $400 off your ticket compared to the summer rush.

And about that summer rush — Lisbon earns its reputation as Europe's sunniest capital honestly, which means June through August brings crowds to match the sunshine. Shoulder season is genuinely the insider move here. The light in October is still golden and warm, the famous yellow tram 28 has shorter queues, and the city breathes a little easier.

Once you land at Humberto Delgado Airport, the Metro is your friend — it connects directly into the city center quickly and cheaply, which is a relief after a long transatlantic journey. Lisbon's neighborhoods reward slow exploration on foot, though the hills will remind your legs that this isn't Amsterdam. The historic Alfama district tumbles down toward the Tagus River in a maze of cobblestones and fado music drifting from open doorways. The viewpoints — miradouros — scattered across the city offer some of the most satisfying urban panoramas in all of Europe.

Eat the pastéis de nata warm from the oven, ideally dusted with cinnamon. Drink the local wines, particularly from the Alentejo and Douro regions. Wander the azulejo-tiled facades of Belém, where the Tower of Belém and the Jerónimos Monastery anchor centuries of maritime history in one extraordinary neighborhood.

The single best tip for this route: treat Lisbon as a base, not just a destination. Day trips to Sintra's fairy-tale palaces and Cascais along the Atlantic coast are easy by train and add enormous depth to the trip without adding flight costs. Seattle travelers making this journey are flying far — make every hour count.

How much are flights from Seattle to Lisbon in 2026?

Flight prices from Seattle (SEA) to Lisbon (LIS) vary significantly depending on the season, day of the week, and how far in advance you book. A good deal is under $650 roundtrip. Standard fare is $900-$1,200+. Popular carriers on this route include TAP Air Portugal, Iberia, United Airlines. FlightKitten eliminates the guesswork by monitoring 220+ airlines twice daily and alerting you the moment economy fares hit your target price.

How does FlightKitten track Seattle to Lisbon fares?

FlightKitten scans over 220 airlines twice every day for economy fares on the SEA to LIS route. When you set a target price, FlightKitten continuously monitors this route and sends an email alert the moment fares drop below your budget. Each alert includes the exact fare, airline, dates, and an AI-powered briefing that explains whether the deal is genuinely good compared to historical pricing on this route. No more obsessive price checking — set your budget and let FlightKitten do the watching.

Pro tip: Book 3-5 months in advance for best fares, as most routings connect through Lisbon or Madrid. Traveling in shoulder season (April-May or September-October) can save $200-$400 compared to peak summer prices.

Looking for business class deals on this route? We recommend checking out BusinessClassSignal.com — a dedicated premium cabin fare tracker that's worth a look if you fly up front.