Need help booking?
Unpublished phone-only deals available
SEA to RML: distance & flight time
Seattle (Seattle Tacoma International Airport) → Colombo (Colombo Ratmalana Airport)
8,449 mi
13,598 km · 7,342 nm
17h 2m
estimated nonstop flight time
+12.5h
time difference · heading northwest
See live SEA→RML fares Phone-only fares on this route — call free
Flight time details
8,449 miles nonstop takes roughly 17h 2m gate to gate, flying northwest. Add 45–90 minutes per connection if there's no nonstop service. Remember to factor the 12.5-hour time gain when reading arrival times on your ticket.
The two airports
- SEA — Seattle Tacoma International Airport · Seattle, United States
- RML — Colombo Ratmalana Airport · Colombo, Sri Lanka
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 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
Near RML
- CMB · Bandaranaike International Colombo Airport25 mi away
- KCT · Koggala Airport65 mi away
- HRI · Mattala Rajapaksa International Airport93 mi away
- GIU · Sigiriya Air Force Base97 mi away
Frequently asked questions
How far is SEA from RML?
The flight distance from Seattle (SEA) to Colombo (RML) is 8,449 miles (13,598 km, 7,342 nautical miles), measured along the great-circle route airlines actually fly.
How long is the flight from SEA to RML?
A nonstop flight takes about 17h 2m 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 Seattle and Colombo?
Colombo is 12.5 hours ahead of Seattle.
What is the cheapest way to fly from SEA to RML?
Compare live fares online, then call CheapoTrav — our agents have unpublished consolidator fares on SEA–RML that never appear on search engines, with no booking fees.