Cheap flights from San Francisco to Dulles
Cheapest current fares: $141 in September 2026, 3,885 km direct flight in ~4h 34m.
Cheapest month-by-month fares
Lowest available fare per calendar month from San Francisco (SFO) to Dulles (IAD). Refreshed daily.
San Francisco (SFO) → Dulles (IAD)
- September 2026 $141
- July 2026 $171
- August 2026 $171
- June 2026 $189
- May 2026 $195
Frequently asked questions
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What is the cheapest month to fly from San Francisco to Dulles?
Based on current 6-month forward fare data, September 2026 is the cheapest month to fly from San Francisco (SFO) to Dulles (IAD), with fares starting from $141.
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What is the lowest current fare from SFO to IAD?
The lowest currently-listed fare from San Francisco (SFO) to Dulles (IAD) is $141 on 2026-09-11.
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How long is the flight from San Francisco to Dulles?
Direct flights from SFO to IAD cover approximately 3,885 km (2,414 miles), with an estimated flight time of 4h 34m. Operating airlines: UA.
Related guides for this route
Sibling pages — full route detail, airport overviews, visa context, per-airline routes.