Best Time to Book

Seattle → Toronto flights

Seattle–Toronto fares run a median of $153 over 30 days; most fall $132–$195, so shop broadly rather than timing one date.

Median fare $153 — but watch for rare spikes near $900

Key takeaways

Median fare is $153, with the bottom quartile (p25) sitting at just $132.
Three-quarters of observed fares stayed at or below $195, a tight, predictable band.
The $908 high is a clear outlier — the 588% spread reflects one extreme fare, not typical pricing.
With 30 daily snapshots, this is a solid sample, though carrier identity wasn't distinguishable in the data.
Booking anywhere near the $132–$195 range puts you in line with normal market pricing.

30-day price trend

SEA → YYZ · cheapest cached fare per day · last 30 days · ↓ 9%

$132 low$908 high

See full numbers and stats on the SEA → YYZ price history page.

The full picture

Over the 30-day window we tracked, Seattle to Toronto fares typically landed in a narrow, affordable band: the median was $153, and the middle 50% of fares (p25–p75) stayed between $132 and $195. That consistency suggests this route doesn't require obsessive timing to catch a good deal — most days already offer a reasonable price.

The headline number to watch is the $908 high, which pushed the spread to 588%. That's not representative of day-to-day pricing; it almost certainly reflects a single anomalous snapshot — perhaps a sold-out low-fare class or a data-capture quirk — rather than a genuine market shift. Excluding that outlier, the route's pricing looks stable and low-variance, which is a good sign for travelers who want predictability over gamesmanship. We don't have enough resolution in this data to say whether booking further out or closer to departure meaningfully changes the price, since we're looking at a rolling snapshot of cached fares rather than a booking-horizon curve.

We also can't confidently identify a dominant carrier or day-of-week pattern from what's available — the data shows fare levels, not airline or weekday breakdowns. Given that, our practical guidance is simple: treat anything at or below $153 as a solid fare, and don't wait for a specific weekday or a marketing myth about optimal booking windows. The one honest caveat: a single extreme data point (the $908 fare) inflates the apparent volatility of this route, so don't let that number scare you into overpaying or panic-booking. Focus on the $132–$195 range as your realistic target.

Ready to look at fares?

Search SEA → YYZ on Aviasales →See the price history →

Related travel pages

Why we regenerated this article: Median fare ↓ 9% ($169 → $153). We only rewrite when the underlying price index actually moves — stable weeks keep the previous take.

AI-authored from this route's 30-day price index. Article last regenerated Sep 19, 2026. Fares shift continuously — confirm at booking.