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CAT to SEA: distance & flight time
Cascais (Cascais Airport) → Seattle (Seattle Tacoma International Airport)
5,197 mi
8,364 km · 4,516 nm
10h 39m
estimated nonstop flight time
-8h
time difference · heading northwest
See live CAT→SEA fares Phone-only fares on this route — call free
Flight time details
5,197 miles nonstop takes roughly 10h 39m gate to gate, flying northwest. Add 45–90 minutes per connection if there's no nonstop service. Remember to factor the 8-hour time set-back when reading arrival times on your ticket.
The two airports
- CAT — Cascais Airport · Cascais, Portugal
- SEA — Seattle Tacoma International Airport · Seattle, United States
Distances are great-circle ("as the crow flies") — the same basis airlines use for frequent-flyer miles.
Alternate airports can cut this fare
Flying from or into a nearby airport is the #1 trick our agents use to beat online prices. Call and we'll compare every combination on one call.
Near CAT
- LIS · Humberto Delgado Airport (Lisbon Portela Airport)12 mi away
- AVR · Alverca Air Base21 mi away
- QLR · Monte Real Air Base80 mi away
- BYJ · Beja Airport / Airbase89 mi away
Near SEA
- RNT · Renton Municipal Airport5 mi away
- BFI · Boeing Field King County International Airport6 mi away
- TIW · Tacoma Narrows Airport18 mi away
- PWT · Bremerton National Airport21 mi away
Frequently asked questions
How far is CAT from SEA?
The flight distance from Cascais (CAT) to Seattle (SEA) is 5,197 miles (8,364 km, 4,516 nautical miles), measured along the great-circle route airlines actually fly.
How long is the flight from CAT to SEA?
A nonstop flight takes about 10h 39m gate to gate. Actual time varies with winds, routing and season — eastbound transatlantic flights, for example, are usually faster than the return.
What is the time difference between Cascais and Seattle?
Seattle is 8 hours behind Cascais.
What is the cheapest way to fly from CAT to SEA?
Compare live fares online, then call CheapoTrav — our agents have unpublished consolidator fares on CAT–SEA that never appear on search engines, with no booking fees.