⚡ Fare recorded April 25, 2026 · Prices change daily

Seattle to Ontario, California flights

Seattle (SEA) to Ontario, California (ONT): 957 miles (1,540 km) great-circle, about 2h 25m nonstop by our estimate. Cheapest fare observed: $86 round-trip on Frontier, nonstop, departing June 5, 2026.

F9FrontierF92276
Depart
SEA
Seattle, USA
11:51
2026-06-05
✈
Arrive
ONT
Ontario, California, United States
Returns 16:04
2026-06-06
Stops
non-stop
Distance
957 mi
Est. nonstop time
2h 25m
Trip type
Round-trip
$86
Round-trip · per person
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About this flight

When did the cheapest Seattle to Ontario, California fare fly?

$86 round-trip, Frontier F92276, departing 2026-06-05 at 11:51, returning 2026-06-06. The recorded itinerary left on a Friday, returning on a Saturday 1 night later; the fare was observed 41 days before departure. "Book this flight" opens Kiwi.com with the same airline and dates.

Route facts

How far is Seattle from Ontario, California?

  • Distance: 957 miles (1,540 km) great-circle, heading south.
  • Estimated nonstop flight time: about 2h 25m.
  • Departure airport: Seattle-Tacoma International Airport (SEA), Seattle, United States, UTC-7 on June 5, 2026.
  • Arrival: Ontario International Airport (ONT), United States, UTC-7 on June 5, 2026.
  • Time difference: none on the recorded date.
  • Route type: domestic, within United States.
  • Arrival airport elevation: 944 ft.
  • Recorded itinerary: Frontier F92276, non-stop, round-trip, 1 days between departure and return.
Fare comparison

How does the Seattle to Ontario, California fare compare with other routes from SEA?

At $86, it ranked 2nd of the 30 round-trip fares we recorded from SEA (median $591). That is 9.0 cents per great-circle mile (round-trip price over one-way distance), below the SEA median of 19.2 cents across 30 round-trip routes.

Routes from SEA of similar length: Los Angeles (955 mi) at $77 and Denver (1,022 mi) at $242.

Frontier had the cheapest fare on 10 of 30 SEA routes. It is the 27th longest of the 30 routes we track from SEA.

Other ways in

What did other cities pay to fly to Ontario, California?

Of 4 departure airports with a fare to Ontario, California, Seattle (SEA) ranked 2nd at $86. Lowest: $59 from Las Vegas (LAS); highest: $1594 from Sapporo (CTS); 3 nonstop. Cheapest-fare airlines (routes): Frontier (2), EVA Air (1) and Volaris (1).

Sources

Where do these numbers come from?

Travelpayouts fares (cheapest per route, observed April 25, 2026); OurAirports coordinates and elevations; IANA zones America/Los_Angeles, America/Los_Angeles; flight time is our estimate.

FAQ

Seattle to Ontario, California flight questions

How far is Seattle from Ontario, California by plane?

+
Seattle is about 957 miles (1,540 km) from Ontario, California on a great-circle line from Seattle-Tacoma International Airport (SEA) to Ontario International Airport (ONT), heading south. It is the 27th longest of the 30 routes we track from SEA. The recorded itinerary was nonstop.

How long is the flight from Seattle to Ontario, California?

+
About 2h 25m nonstop by our estimate for 957 miles (500 mph cruise plus 30 minutes, not a timetable). The recorded Frontier fare was nonstop. 4 airports in our feed had a fare to Ontario, California; this one ranked 2nd, and 3 of the 4 were nonstop.

What is the time difference between Seattle and Ontario, California?

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On June 5, 2026, Seattle was on UTC-7 (America/Los_Angeles) and Ontario, California on UTC-7 (America/Los_Angeles), so the two cities shared the same clock time: noon in Seattle was 12:00 in Ontario, California. Both zones shift for daylight saving together, so the gap stays the same in January and July.

How much is a flight from Seattle to Ontario, California?

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As observed on April 25, 2026: $86 per person round-trip on Frontier flight F92276, departing June 5, 2026, returning June 6, 2026, nonstop. At $86, it ranked 2nd of the 30 round-trip fares we recorded from SEA (median $591). That is 9.0 cents per great-circle mile (round-trip price over one-way distance), below the SEA median of 19.2 cents across 30 round-trip routes. Prices change daily, so check the live fare.

Is there a nonstop flight from Seattle to Ontario, California?

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Yes, the cheapest recorded fare was a nonstop Frontier flight, F92276, on June 5, 2026. Into Ontario, California, 3 of the 4 recorded fares were nonstop. From SEA, 9 of 30 were. Routes from SEA of similar length: Los Angeles (955 mi) at $77 and Denver (1,022 mi) at $242.

Which airports serve flights from Seattle to Ontario, California?

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It departs Seattle-Tacoma International Airport (SEA) in Seattle, United States, and arrives at Ontario International Airport (ONT) in Ontario, California, United States. A domestic United States flight. Frontier had the cheapest fare on 10 of 30 SEA routes. Ontario International Airport (ONT) sits at 944 ft above sea level.

Where else near Ontario, California can you fly from Seattle?

Los Angeles (LAX) $77San Diego (SAN) $355Las Vegas (LAS) $126Phoenix (PHX) $279San Francisco (SFO) $162El Paso (ELP) $467All flights from Seattle →

Other cities with flights to Ontario, California

From Las Vegas (LAS) $59From Guadalajara (GDL) $338From Sapporo (CTS) $1594

Ready to fly?

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