Seattle and Warsaw sit roughly 4,700 miles (about 7,600 km) apart on a great-circle path that arcs up over Canada, Greenland, and Scandinavia before descending into Central Europe. That routing matters more than it sounds — it's why LOT Polish Airlines can operate this sector nonstop on a Boeing 787-8 Dreamliner, a route it launched as one of its flagship long-haul US expansions and has kept running (with some seasonal frequency changes) ever since. If a nonstop is showing on your search, it's almost certainly LOT; no US carrier currently flies this pair directly.
Eastbound from Seattle to Warsaw, the jet stream works in your favor and the flight typically runs shorter — often in the 9-and-a-half-hour range. Coming back westbound, you're fighting that same tailwind, so Warsaw to Seattle regularly stretches past 11 hours, one of the longer westbound legs LOT operates anywhere in its network. If you're booking a round trip and comparing itineraries, don't assume the return leg mirrors the outbound duration — it won't.
LOT's nonstop is the only same-plane option, but it isn't always the most frequent, especially outside peak summer months when the airline sometimes trims to a handful of weekly departures. When the nonstop isn't convenient or isn't scheduled on your dates, one-stop itineraries via Star Alliance partners are the natural fallback: United through Chicago O'Hare or Newark, Lufthansa through Frankfurt or Munich, SAS through Copenhagen, or Air France-KLM through Paris or Amsterdam. Frankfurt and Munich connections tend to be the most schedule-friendly for onward flights into Warsaw because Lufthansa runs multiple daily WAW rotations from both hubs. British Airways via London Heathrow is another option worth comparing, particularly for travelers who want to break up the westbound overnight with a daylight connection.
Sea-Tac consolidated its international departures years ago, and LOT's Warsaw flight operates out of the South Satellite/International Arrivals Facility area, reached via the airport's underground train from the main terminal. Budget extra time here — the walk-and-train combination from security to gate can take 15-20 minutes on a busy day. On arrival back into Seattle from Warsaw, international travelers clear immigration and customs in the IAF before recollecting bags, a process that's generally efficient outside of peak holiday arrival banks. Sea-Tac's Link light rail connects the airport directly to downtown Seattle in under 40 minutes, which is the simplest way to reach the city without a rental car.
Warsaw Chopin (not to be confused with the secondary Modlin airport used by budget carriers) sits about 10 km south of the city center and operates from a single main terminal complex. After immigration — a standard Schengen passport check for non-EU arrivals — the fastest way into the city is the SKM/KM suburban rail line from the airport's own station, reaching central Warsaw stops like Śródmieście in around 20 minutes. Bus 175 is a reliable, cheaper alternative if you're staying somewhere the rail doesn't directly serve. Taxis and ride-hailing apps are readily available outside arrivals, though official airport taxi ranks are the safer bet over unmarked cars soliciting fares inside the terminal.
| Month | Seattle Avg High/Low | Warsaw Avg High/Low | Notes |
|---|---|---|---|
| Jan | 47°F / 37°F | 34°F / 26°F | Warsaw can see snow; Seattle is wet, not cold |
| Apr | 60°F / 44°F | 57°F / 39°F | Shoulder season, good flight availability |
| Jul | 76°F / 57°F | 77°F / 58°F | Peak season both ends; book early |
| Oct | 60°F / 46°F | 56°F / 42°F | Fall colors in Warsaw, rain returns to Seattle |
| Dec | 47°F / 37°F | 36°F / 28°F | Christmas markets in Warsaw, festive but cold |
Summer (June through early September) is the easiest time to fly this route — LOT typically runs its fullest nonstop schedule, daylight hours are long at both ends, and Warsaw's Old Town markets and outdoor cafés are in full swing. Late spring and early autumn offer a good compromise: fewer crowds, milder temperatures, and generally more stable fare availability than the July-August peak.
Warsaw's Christmas markets (late November through December) draw travelers willing to brave the cold, and the city's classical music scene peaks every five years with the International Chopin Piano Competition, a major draw for music travelers when it's on. On the Seattle side, late-summer events like Bumbershoot and Seafair coincide with the airline's highest-frequency nonstop schedule, making it a natural window for a Poland-bound trip that starts or ends with a few days in the Pacific Northwest.
Because LOT is the sole nonstop operator, its own fare calendar effectively sets the rhythm for this route — frequency (and competitive pricing pressure) rises in summer and dips in the depths of winter. If your travel dates are flexible, shifting by even a few days around major US or Polish holidays (Thanksgiving, Christmas, Easter) tends to open up meaningfully better availability, since both leisure and diaspora travel volumes spike hard around those windows. Travelers connecting through European hubs should also build in a reasonable buffer — Frankfurt and Amsterdam can have tight but workable minimum connection times, while Heathrow's terminal transfers sometimes require more of a cushion.
Warsaw is a Schengen entry point, meaning US and Canadian passport holders clear passport control on arrival in Poland and then move freely through other Schengen countries without further checks. If you're connecting through a hub like Frankfurt or Amsterdam on the way to Warsaw, you'll typically clear Schengen immigration at that first EU airport, not in Warsaw itself — worth knowing so you don't budget extra time for a check that's already happened upstream.
No live fares are cached for this route right now — run a live search for real-time prices.
Search SEA → WAW| Airline / fare | Cabin bag | Checked bag | Extra bag |
|---|---|---|---|
| LOT Polish Airlines | 1 cabin bag up to 8kg plus a small personal item | 1-2 checked bags depending on fare class, typically up to 23kg each | Charged per additional bag or excess kilogram, varies by route and fare type |
| Lufthansa (connecting via FRA/MUC) | 1 cabin bag plus personal item, standard size limits apply | Included allowance varies by fare class, generally 1 bag up to 23kg on standard fares | Assessed per bag at check-in, higher for oversized or overweight items |
| United Airlines (connecting via ORD/EWR) | 1 carry-on plus personal item | Checked bag inclusion depends on fare class; basic economy often excludes it | Charged per bag, with higher fees for international long-haul segments |
Because most itineraries on this route involve LOT nonstop or a Star Alliance connection, checked baggage allowances usually carry through to your final destination — but always verify through-checking rules if your connection involves a separate ticket or different alliance.
The Warsaw-to-Seattle return is one of the longer westbound hauls LOT operates, often over 11 hours against the jet stream — an aisle seat near the galley makes it easier to move around and adjust before landing in a similar time zone to when you left.
LOT sometimes trims this route to fewer weekly nonstop departures in deep winter, so if you're booking November through February, check connecting options early rather than assuming a nonstop will be available on your exact date.
The internal train to the South Satellite/International Arrivals Facility adds real walking and waiting time beyond what a typical domestic gate transfer requires, so arrive earlier than you would for a US-only flight.
Stay in Śródmieście or near the SKM rail line if you want fast, stress-free airport access on both ends of the trip; choose Old Town or Praga only if you're comfortable adding a short transfer before your flight home.
Yes. LOT Polish Airlines operates the only nonstop service on this route, flying a Boeing 787-8 Dreamliner between Sea-Tac and Warsaw Chopin, though frequency can drop outside peak summer months.
The eastbound nonstop typically takes around 9.5 hours thanks to tailwinds, while the westbound return from Warsaw to Seattle usually runs longer, often exceeding 11 hours.
One-stop options via Star Alliance partners are the most practical fallback, particularly Lufthansa through Frankfurt or Munich, which offer multiple daily onward connections to Warsaw.
Flights land at Warsaw Chopin Airport (WAW), the main international gateway south of the city center — not Modlin (WMI), which serves budget carriers on separate routes.
If your itinerary connects through another Schengen airport like Frankfurt or Amsterdam before Warsaw, you'll clear passport control there rather than in Poland, so plan your connection time accordingly.
The airport's own SKM/KM suburban rail line reaches central Warsaw in about 20 minutes and is generally faster and cheaper than a taxi during peak traffic hours.
Late spring and early autumn tend to balance mild weather with better flight availability, while summer offers the fullest nonstop schedule but also the highest demand from both leisure and diaspora travelers.
Yes — LOT's flight departs from the South Satellite/International Arrivals Facility, which requires an internal train transfer from the main terminal, so allow extra time beyond a typical domestic connection.
Speak with a Way4Fly travel specialist for live availability and deals not shown online — day, night, weekends and holidays.
