Best Time to Book

Boston → Washington flights

Boston to Washington fares run a median of $56, with a bottom quartile at $55 — book when you see that price, don't wait for lower.

BOS–DCA fares hover near $56 — the floor, not a fluke

Key takeaways

Median fare is $56, just a dollar above the observed low of $55
Bottom quartile ($55) is nearly identical to the median — meaning cheap fares aren't rare, they're the norm
High end spikes to $83, a 51% spread from low to high across the window
With only 12 snapshots, this read is directional, not a statistically deep sample
No dominant carrier was visible in the data, so this reflects the overall market, not one airline's pricing

30-day price trend

BOS → DCA · cheapest cached fare per day · last 13 days · ↑ 48%

$55 low$83 high

See full numbers and stats on the BOS → DCA price history page.

The full picture

The data shows a tight cluster at the low end: a $56 median sitting barely above the $55 floor, with the 25th percentile matching that floor almost exactly. That tells us most days in this 12-day window priced close to the cheapest fare seen — the $83 high looks like an outlier rather than a typical price point. A 51% spread sounds dramatic, but it's being driven by a handful of higher fares against an otherwise flat, cheap baseline.

Because the bulk of observations sit near $55–56, there isn't strong evidence of a booking window where prices 'soften' — this route already looks inexpensive most of the time. The more useful takeaway is to treat anything above $65–70 as paying a premium over what's normally available, and to book promptly when you see a fare in the mid-$50s rather than waiting for a deeper discount that the data doesn't show happening.

We can't speak to day-of-week or carrier-specific patterns here since the dataset doesn't surface a dominant airline or enough granularity to isolate weekday effects. The honest caveat: with only 12 daily snapshots, this is a thin sample for a route that may have more volatility than it reveals over a longer window. Treat the $55–56 range as a reliable target based on current evidence, but don't assume the $83 high is rare just because it only showed up once or twice — a larger sample could tell a different story.

Ready to look at fares?

Search BOS → DCA on Aviasales →See the price history →

Related travel pages

Why we regenerated this article: Top quartile ↑ 44% ($57 → $82). 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.