Best Time to Book

Seattle → San Francisco flights

Median Seattle to San Francisco fare is $53 over a 12-day sample; most fares sit at or near the low end, so there's little need to time bookings precisely.

Seattle–SF fares cluster near $53, with only occasional spikes to $75

Key takeaways

Median fare of $53 matches the observed low, meaning most sampled days priced at the floor
Bottom quartile (p25) is also $53, confirming cheap fares are the norm, not the exception, in this sample
Top quartile reaches $62, with a single high outlier at $75
42% spread looks wide on paper, but it's driven by a small number of pricier snapshots rather than a volatile market
Sample size is thin at 12 days, so treat these ranges as a directional signal, not a precise forecast

30-day price trend

SEA → SFO · cheapest cached fare per day · last 13 days · ↑ 3%

$53 low$75 high

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

The full picture

The data shows a route where cheap fares are the baseline rather than something you have to hunt for. With a median of $53 that matches the observed low, and a p25 that's identical at $53, more than a quarter of sampled days priced at the floor. The $75 high appears to be an outlier rather than a common occurrence, since the p75 sits much closer to the median at $62 — most fares cluster tightly in the low-to-mid $50s.

Because this is a short, high-frequency route between two major West Coast hubs, the 42% spread is better read as 'occasional premium fares' than genuine volatility. We don't have enough resolution in this dataset to say when in a booking horizon prices typically soften — that would require tracking the same itinerary over time as the travel date approaches, which isn't what these 12 snapshots capture. What we can say is that if you see something near $53–$56, you're at or near the bottom of the observed range; paying $70+ puts you in outlier territory based on this sample.

No dominant carrier or day-of-week pattern is visible in the data provided, so we won't speculate on airline-specific behavior or claim certain departure days are cheaper — those patterns aren't supported here. The honest caveat: with only 12 days sampled, this is a thin window. It's enough to establish that fares are generally low and stable on this route, but not enough to guarantee the $75 ceiling won't be exceeded on a day we didn't capture, or to pinpoint a specific booking-window sweet spot with confidence.

Ready to look at fares?

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

Related travel pages

Why we regenerated this article: Median fare ↓ 15% ($62 → $53). 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 Oct 10, 2026. Fares shift continuously — confirm at booking.