Shannon to Seattle (SNN–SEA) — Airlines, Schedules & Connections
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No nonstop flights on this route. connecting options below.
SNN–SEA is served by 1 airline with nonstop service. CMB leads the route. The flight covers 4,488 miles in approximately 8h 29m. Beyond nonstop, 20 hubs offer 1-stop connections.
Airline Landscape
| Airline | Freq/wk | Aircraft | Duration | Dep OTP | Alliance | Codeshares |
|---|---|---|---|---|---|---|
| CMB CMB | 0 | – | – | – | – | – |
Connection Landscape
Other ways to reach Seattle from Shannon
| Metric | SNN→SEA | DUB→SEA |
|---|---|---|
| Distance from SNN | – | 121 mi |
| Nonstop airlines | 1 | 1 |
| Weekly flights | 0 | 7 |
| Flight time | 8h 29m | 9h 45m |
Travel Essentials
SNN: IST · SEA: PDT
When it's 6:00 PM in Shannon, it's 10:00 AM in Seattle.
Irish passport holders enter the United States visa-free under the Visa Waiver Program (VWP) for stays up to 90 days. An approved ESTA (Electronic System for Travel Authorization) is required before boarding. The ESTA costs $21, is valid for 2 years or until the passport expires (whichever comes first), and covers multiple entries. Apply at esta.cbp.dhs.gov at least 72 hours before departure, though most approvals come within minutes.
Passport must be an ePassport (biometric chip, all current Irish passports qualify). No supporting documents are formally required for ESTA approval, but CBP officers at the port of entry may ask for proof of onward travel, accommodation details, and sufficient funds. The 90-day VWP stay cannot be extended and does not allow a change of immigration status. If you need more than 90 days, apply for a B-1/B-2 visa at the US Embassy in Dublin (MRV fee $185, interview wait times vary from 1 to 6 weeks).
Direct flights from Dublin to the US serve New York (JFK/EWR), Boston, Chicago, Washington Dulles, Los Angeles, San Francisco, and several others, running 7 to 10 hours. Shannon also has direct US routes. US Customs and Border Protection preclearance operates at Dublin and Shannon, meaning you clear US immigration before boarding and arrive as a domestic passenger. The US dollar is the only currency. No vaccination requirements for Irish arrivals.
Link Light Rail from the airport station (inside the terminal) to downtown Seattle takes 38 minutes ($3.50). No transfers needed; trains run 5am to 1am daily.Taxis and ride-shares to downtown cost $35–55. For Bellevue and Eastside destinations (across Lake Washington), ride-share is faster than Link. Car rentals are in the consolidated rental facility; take the free shuttle from baggage claim. Sound Transit buses serve Tacoma, Renton, and Federal Way.
Marine west coast climate. Winters are mild but persistently grey and rainy (3–9°C). Snow is rare at sea level but can occur December through February, causing significant disruptions when it does. The airport sits between Seattle and Tacoma in an area that receives more fog and low cloud than downtown Seattle.
Summers are famously pleasant (18–25°C) with low humidity and mostly clear skies, one of the best flying climates in the US from June through September. The wettest months are November through January.
SNN–SEA Quick Facts
Frequently Asked Questions
Flights from SNN to SEA
Shannon Airport (SNN) and Seattle–Tacoma International Airport (SEA) are connected by nonstop service from CMB.
SNN to SEA Flight Duration and Schedule
Nonstop flight time from SNN to SEA ranges from 8 hours 29 minutes. The route covers a distance of 4,488 miles (7,222 km).
Connecting Options and Alternatives
20 one-stop connections are available, with the fastest taking approximately 8 hours via YYT. Two-stop connections are also available via intermediate hubs. Nearby alternative airports include Dublin (DUB).