Flight Routes from Ontario to Seattle Tacoma

Compare cheap outbound and return flights from Ontario (ONT) to Seattle-Tacoma (SEA) and find the best offer from numerous airlines and travel agencies.

Trip type
Cheapest roundtrip flight
from€318
Fastest flight
non-stop flights
46x / week
Flight distance
1,542 km
Time difference
none

Flight schedule from Ontario (ONT) to Seattle-Tacoma (SEA)

Select a travel date in the flight schedule for the route from Ontario (ONT) to Seattle-Tacoma (SEA) and compare affordable flight deals.

offers
Active filtersnone
Matching outbound flightsONT–SEA · 19 of 19
fromto
dep.arr.
durationstopovers
  1. September 20 – 26, 2026
  2. Sep 27 – Oct 3, 2026
  3. October 4 – 10, 2026
    1. ONTSEA
      nonstop
      1. Alaska Airlines
    2. ONTSEA
      nonstop
      1. Alaska Airlines
    3. ONTSEA
      nonstop
      1. Alaska Airlines
    4. ONTSEA
      nonstop
      1. Delta Air Lines
    5. ONTSEA
      nonstop
      1. Alaska Airlines
    6. ONTSEA
      nonstop
      1. Delta Air Lines
    7. ONTSEA
      nonstop
      1. Alaska Airlines
    8. ONTSEA
      nonstop
      1. Alaska Airlines
    9. ONTSEA
      nonstop
      1. Alaska Airlines
    10. ONTSEA
      nonstop
      1. Delta Air Lines
    11. ONTSEA
      nonstop
      1. Alaska Airlines
    12. ONTSEA
      nonstop
      1. Alaska Airlines
    13. ONTSEA
      nonstop
      1. Alaska Airlines
    14. ONTSEA
      nonstop
      1. Frontier Airlines
    15. ONTSEA
      nonstop
      1. Delta Air Lines

      Important flight information

      Frequently Asked Questions (FAQ)

      Which airports near Ontario are frequently used for flights to Seattle-Tacoma?
      In addition to Ontario airport, users also frequently search for flights from Santa Barbara and Los Angeles to Seattle-Tacoma. Alternative departure airports can offer more choice of flight times, airlines or prices. Also check how accessible each airport is for you.

      Discover more flights around Ontario and Seattle-Tacoma

      Departure airport Airport Ontario-CA (ONT)
      Arrival airport Airport Seattle-Tacoma International Airport, WA (SEA)
      Destination country Flights to United States
      Departure airport - Destination country Ontario-CA - United States
      Alternative routes to United States
      Alternative flights to Seattle-Tacoma
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