Best Time to Book

San Francisco → Madrid flights

Across 25 daily snapshots, San Francisco to Madrid fares median at $359 — book when prices sit near the $355–$368 band to avoid the high-end outliers.

SFO→MAD: Median $359, but outliers can spike to $516

Key takeaways

Median fare is $359, with the middle 50% of observations clustered tightly between $355 (p25) and $368 (p75).
The low end is $348 — just $11 below median — suggesting rock-bottom deals are rare and fleeting on this route.
The high end reaches $516, a 48% spread above the low, meaning mistimed searches can cost you significantly more.
The interquartile range is only $13 wide, so for most shopping sessions you'll land near $359 — this is a route with a stable floor, not a lottery.
25 daily snapshots underpin this analysis — a reasonable but not exhaustive sample; treat outliers at either extreme with some caution.

30-day price trend

SFO → MAD · cheapest cached fare per day · last 30 days · ↓ 8%

$326 low$516 high

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

The full picture

The SFO–MAD fare landscape is defined by a remarkably compressed core: the middle half of all observed fares spans just $13, from $355 to $368. That's an unusually tight interquartile range for a transatlantic route, and it carries a practical implication — bargain-hunting below $350 is likely to be frustrating. The floor across 25 snapshots was $348, only $11 under median. If you see anything in the $348–$360 range, that's genuinely competitive and worth locking in.

The spread statistic (48%) is driven almost entirely by the upper tail: fares reached $516 in at least one snapshot, which is 44% above the low. This kind of spike is typical when award inventory drains or when a sale window closes and published fares reset to standard levels. The practical takeaway is directional rather than calendar-specific: monitor fares regularly once you're inside a 60–90 day booking window, where transatlantic routes historically see the most volatility as inventory compresses. If you're watching and prices climb past $400, that's a meaningful deviation from the cluster and a signal the window may be closing.

No dominant carrier pattern is visible in this dataset, so we can't responsibly point you toward a specific airline as the reliable low-fare option. Similarly, the data doesn't segment by departure day-of-week, so claims about "cheapest days to fly" would be speculation rather than evidence. What the data does support is a straightforward target: aim for fares at or below $368 (the 75th percentile), treat anything near $355 as a strong buy, and treat anything above $400 as a sign to pause and reassess timing. One honest caveat: 25 snapshots capture a narrow slice of time and may not reflect seasonal shifts — fares to Madrid from San Francisco can move materially around peak summer and holiday periods not represented here.

Ready to look at fares?

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

Related travel pages

Why we regenerated this article: Snapshot depth changed (18 → 25 samples). 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 12, 2026. Fares shift continuously — confirm at booking.