San Francisco International Airport is one of the busiest airports on the West Coast, handling over 55 million passengers annually. Its runways are oriented northwest to southeast, which means a significant portion of San Mateo County falls under departure and arrival flight paths. For homebuyers, this creates an interesting dynamic: properties under heavier flight paths often sell at a discount compared to similar homes just a mile or two away. The question is whether that discount represents genuine value or a compromise you will regret.
Which Cities Are Most Affected?
The noise impact varies significantly by neighborhood and even by street. Here is a general overview of the most affected areas.
- South San Francisco and San Bruno. These cities sit closest to SFO and experience the most frequent and lowest-altitude overflights. Homes directly under the approach paths can experience noise levels above 65 decibels, the threshold at which the FAA considers aircraft noise significant.
- Millbrae. Parts of Millbrae, particularly the flatlands east of El Camino Real, fall under departure paths. The hillside neighborhoods above Millbrae Avenue are less affected due to elevation and distance.
- Burlingame. The Burlingame Hills and Broadway area experience moderate aircraft noise, particularly during southeast arrivals. The impact is less severe than in South San Francisco but still noticeable during peak hours.
- San Mateo. Eastern neighborhoods near the Bay, including portions of the Fiesta Gardens and Bay Meadows areas, experience some flight noise, though generally at lower levels than cities closer to the airport.
- Foster City and Redwood Shores. These waterfront communities are farther from the primary flight paths and experience minimal direct noise impact.
The Price Discount
Homes in the most noise-affected areas of San Mateo County typically sell at a 5 to 15 percent discount compared to equivalent properties in quieter neighborhoods. On a $1.5 million home, that translates to $75,000 to $225,000 in savings. The discount is most pronounced in South San Francisco and San Bruno, where proximity to the airport is a daily reality.
In cities like Millbrae and Burlingame, the discount is more subtle, typically 3 to 7 percent, and depends heavily on the specific micro-location within the city.
What You Can Do About Noise
Modern noise mitigation has improved dramatically. Dual-pane windows, which are standard in most Bay Area homes built after 1990, reduce interior noise levels by 25 to 30 decibels. For older homes, upgrading to double- or triple-pane windows with sound-dampening ratings can reduce aircraft noise to barely noticeable levels when inside the home.
The SFO Airport Noise Insulation Program has historically offered free soundproofing upgrades to qualifying homes in the highest-impact zones. Check with the SFO Noise Abatement Office to see if a property you are considering is eligible.
The Lifestyle Factor
Noise tolerance is personal. Some buyers genuinely do not notice aircraft noise after a few weeks of acclimation. Others find it a persistent irritant, particularly during outdoor entertaining or early morning departures. I always recommend that my clients visit a flight-path property at different times of day, including early morning and evening peak hours, before making a decision.
The Investment Perspective
Flight-path homes have historically appreciated at roughly the same rate as non-flight-path homes in the same city, meaning the percentage discount tends to persist over time. You buy at a discount and sell at a discount. The value play is in the initial savings and lower carrying costs, not in closing the noise gap over time.
The Bottom Line
For buyers who are noise-tolerant and budget-conscious, homes under SFO flight paths offer genuine savings in San Mateo County without sacrificing access to excellent schools, Peninsula convenience, or long-term appreciation. If you are considering a flight-path property, I can help you evaluate the specific noise exposure and determine whether the discount justifies the trade-off for your situation.