● Deals from
● Sweeping every destination…
$51usually $77−34%6 Sept 2026 · direct · score 69/100 · Solid
Why so cheap?
Researching this route’s pricing right now — checking season, sales, capacity and route news…
Fares by departure date
Today’s fare is cheaper than 67% of the 12 fares tracked for this route.
Questions people ask about this route
- What is the lowest price for a flight from Seattle to Ontario right now?
- The lowest price our scan found today (2026-08-30) is $51 one-way fare, departing 6 Sept 2026, direct. Fares move constantly — the link below re-checks live availability on Aviasales.
- Is $51 a good price for a Seattle to Ontario flight (SEA→ONT)?
- Yes by the data: this route usually costs about $77 (midpoint of Google Flights' typical price range), so $51 is 34% below usual and cheaper than 67% of the 12 fares tracked for this route. FareFloor's deal score for it is 69/100 as of 2026-08-30.
- When is the cheapest time to fly from Seattle to Ontario in the coming months?
- Across the departure windows our 2026-08-30 scan compared, the lowest-priced departure found is 6 Sept 2026 at $51 one-way fare. Method: we sweep this origin's destinations several times a day via Google Flights data and keep the cheapest round-trip window per route — a cheaper window can appear any day, so treat this as today's answer, not a permanent one.
- Why is it so cheap to fly from Seattle to Ontario right now?
- Flights from Seattle to Ontario departing 6 September 2026 are currently about 34% cheaper than usual — $51 against a usual level of roughly $77 — because the aggressive Frontier ultra‑low‑cost carrier price sale on early‑September dates, combined with September’s historically low demand on the Seattle‑Ontario route. (Researched 30 August 2026 from current web sources.)
- Is there a direct flight from Seattle to Ontario at this price?
- Yes — the $51 fare found today is a direct flight.