San Francisco (SFO) to Ulaanbaatar (UBN): 5,812 miles (9,354 km) great-circle, about 12h 05m nonstop by our estimate. Cheapest fare observed: $1531 round-trip on MIAT Mongolian Airlines, with 1 stop, departing July 17, 2026.
$1531 round-trip, MIAT Mongolian Airlines OM873, departing 2026-07-17 at 01:20, returning 2026-08-01. The recorded itinerary left on a Friday, returning on a Saturday 15 nights later; the fare was observed 83 days before departure. "Book this flight" opens Kiwi.com with the same airline and dates.
At $1531, it ranked 28th of the 30 round-trip fares we recorded from SFO (median $646). That is 26.3 cents per great-circle mile (round-trip price over one-way distance), above the SFO median of 16.9 cents across 30 round-trip routes.
Routes from SFO of similar length: Moscow (5,861 mi) at $1795 and Beijing (5,899 mi) at $1182.
SFO to UBN is the only one of 30 SFO routes where MIAT Mongolian Airlines priced cheapest. It is the 13th longest of the 30 routes we track from SFO.
Of 6 departure airports with a fare to Ulaanbaatar, San Francisco (SFO) ranked 6th at $1531. Lowest: $359 from Seoul (ICN); highest: $1531 from San Francisco (SFO); 2 nonstop. Cheapest-fare airlines (routes): Jeju Air (2), MIAT Mongolian Airlines (2), Air China (1) and Asiana (1).
Travelpayouts fares (cheapest per route, observed April 25, 2026); OurAirports coordinates and elevations; IANA zones America/Los_Angeles, Asia/Ulaanbaatar; flight time is our estimate.