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SEA to SDY: distance & flight time
Seattle (Seattle Tacoma International Airport) → Sidney (Sidney - Richland Regional Airport)
843 mi
1,356 km · 732 nm
2h 18m
estimated nonstop flight time
+1h
time difference · heading east
See live SEA→SDY fares Phone-only fares on this route — call free
Flight time details
843 miles nonstop takes roughly 2h 18m gate to gate, flying east. Add 45–90 minutes per connection if there's no nonstop service. Remember to factor the 1-hour time gain when reading arrival times on your ticket.
The two airports
- SEA — Seattle Tacoma International Airport · Seattle, United States
- SDY — Sidney - Richland Regional Airport · Sidney, 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 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 SDY
- ISN · Sloulin Field International Airport41 mi away
- GDV · Dawson Community Airport49 mi away
- OLF · L M Clayton Airport69 mi away
- DIK · Dickinson Theodore Roosevelt Regional Airport91 mi away
Frequently asked questions
How far is SEA from SDY?
The flight distance from Seattle (SEA) to Sidney (SDY) is 843 miles (1,356 km, 732 nautical miles), measured along the great-circle route airlines actually fly.
How long is the flight from SEA to SDY?
A nonstop flight takes about 2h 18m gate to gate. Actual time varies with winds, routing and season — eastbound transatlantic flights, for example, are usually faster than the return.
Are there nonstop flights from SEA to SDY?
Nonstop service on SEA–SDY depends on the season and the day of week. Run the fare search on this page with the nonstop filter applied to see current direct options; when there is no nonstop, a single connection through a carrier hub adds roughly 2–4 hours to the 2h 18m nonstop estimate.
What is the time difference between Seattle and Sidney?
Sidney is 1 hour ahead of Seattle.
What is the cheapest way to fly from SEA to SDY?
Compare live fares online, then call CheapoTrav — our agents have unpublished consolidator fares on SEA–SDY that never appear on search engines, with no booking fees.
Why are some SEA to SDY fares phone-only?
Consolidator contracts let us sell certain SEA–SDY tickets below the price airlines permit us to publish online, so those fares can only be quoted over the phone. Call the travel desk and an agent will check phone-only inventory for your dates.