Seattle to Ontario: buy now or wait?
Typical one-way fare Seattle→Ontario: €72 (median of 38 daily lowest fares we tracked); under €61 is a good price; cheapest month: November; book 56–83 days ahead.
Cheaper than 37% of what we have seen
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Fare Desk notes
Frontier Airlines offers the cheapest one-way seat today on the route from Seattle to Ontario at €74 for departure on 19 November 2026. This non-stop fare is cheaper than 23% of the fares we logged across 130 observations. Our verdict today is Wait, as this price sits above the typical fare of €65.
Looking at our historical data, better prices regularly appear. The lowest fare we logged on this route is €28. Travelers booking 56 to 83 days before departure find a typical fare of €54, saving €53 versus booking last minute based on a sample of 24 observations.
Cheaper months are also available. December is the cheapest month with a typical fare of €31 across 25 observations, followed by November at €70 across 49 observations, and October at €98 across 32 observations.
Piratefly Fare Desk · prices checked on
All fares Seattle → Ontario
Cheapest first. Every price is live and goes straight to booking.
What the history says
Based on 191 prices we recorded on this exact route, compared against the same departure month.
Best booking window
56–83 days — is when this route has been cheapest to book: €72 typical, on 28 observations. That is about €39 less than booking in the last two weeks.
Cheapest months to fly to Ontario
Booking tips from our fare data
- How far in advance should you book a flight?
- Book 1–1.5 months before departure. Tracking the same flights at every lead time (97,668 flights on 19,841 routes, 2026-06-14 to 2026-11-05), that window had the smallest average premium over each flight's lowest fare: +16.7%, against +49.3% in the last 3 days.
- What is the cheapest day of the week to fly?
- Wednesday. Comparing each fare with the median of its own route, Wednesday departures were +3.5% and Tuesday +4.3%, while Friday was the dearest at +10.5%. Weekend departures cost more than midweek ones.
- What is the cheapest month to fly?
- November 2026. Comparing each route's fares month by month (booked 8–60 days ahead), November 2026 departures were -1.1% against the route's own median, while January 2027 was the dearest at +22.7%. Covers September 2026, October 2026, November 2026, December 2026, January 2027; fares observed 2026-06-14 to 2026-11-05.
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