United Airlines· Callsign UAL1641

UA1641 from Washington to San Francisco, tracked live

United Airlines's domestic Washington-San Francisco service, 3,883 km west - tracked live here.

Save
Send this flight to someone

They get a page with the live position and no sign-up. The link stops working when it expires.

Not currently flying

Status on this page means observed ADS-B activity inside available receiver coverage. Confirm official delay, cancellation, gate and booking status with United Airlines.

IAD
Washington
Washington Dulles International Airport
3,883 km · 2,413 mi
Non-stop
SFO
San Francisco
San Francisco International Airport
Aircraft
Boeing 737-900ER
typical equipment
Distance
3,883 km
2,097 nautical miles
Heading
282°
tracks west
Clock change
-3 h
on arrival
Range used
71%
of the type's book range
Length rank
#259
of 439 tracked routes

Follow UA1641 in real time

The aircraft appears below whenever it is airborne and inside receiver coverage. Its planned route is drawn between the two airports.

UA1641 is not transmitting right now. It may be between rotations, on the ground, or out of receiver range - Check back near departure time. The full map has the rest of the sky, and what is flying over me will name whatever is above you instead.

UA1641 at a glance

  • The trip: 3,883 km (2,413 miles) from Washington to San Francisco, flying west.
  • How long: no published block time for this service yet.
  • Your watch: set it 3 hours back on arrival.
  • Window seat tip: the left (south-facing) side gets the sun on a daytime flight.
  • The plane: usually a Boeing 737-900ER. This route uses about 71% of how far it can fly.

UA1641 route overview: IAD to SFO

UA1641 distance and great-circle path

UA1641 covers 3,883 km, or 2,413 miles. That makes it a medium-haul flight, long enough for a full meal service, short enough for narrowbodies. Of the 439 routes we track, it ranks 259 by distance.

Both ends of this route are in United States. It is 3,883 km of domestic flying west, from Washington to San Francisco. Watches move 3 hours back between the two gates.

Our guide explains how the IAD-SFO route appears on a tracker map.

Can the Boeing 737-900ER comfortably fly UA1641?

Not really. It uses about 71% of the Boeing 737-900ER's range. That leaves room for a full load of passengers and bags. The full numbers are on our aircraft page for the Boeing 737-900ER.

What to know about UA1641

  • Time change: you land 3 hours behind the time you left.

What we know about UA1641

What flying IAD to SFO takes

It is a medium-haul sector, long enough for a full meal service, short enough for narrowbodies. United Airlines needs a narrowbody on the longer variants, or a widebody where demand justifies it: at this distance the choice is usually about seat count rather than range. Westbound, this route pushes into the prevailing winds aloft, which is why the eastbound leg is normally the quicker one. In daylight the sun sits on the left (south-facing) side of the cabin for most of the crossing.

How we verified this

The origin and destination on this page are the ones we verified for callsign UAL1641 through adsbdb, not a schedule copied from elsewhere. We have logged it airborne on 4 days between 2026-09-20 and 2026-09-23. Timings are observations, not an official operational status: always confirm with the airline before travelling.

This page was published from our own tracking record rather than a third-party schedule feed, so it grows as we see the flight again. The seven-day log below is the raw version of the same evidence.

UA1641 activity in the past 7 days

No stored observation has been recorded in this seven-day window. The published schedule and route above remain reference data, not evidence that the flight operated.

Date (UTC)RouteFirst trackedLast trackedTracked for
No tracked activity recorded yet for the past 7 days. Activity is logged every time this flight appears on the live map.

“First/last tracked” are when UA1641 entered and left receiver coverage, in UTC.

Airports and aircraft on UA1641

Every scheduled service we follow is listed in the tracker directory, including United Airlines and other tracked flights grouped by airline.

IAD Washington Dulles International Airport Washington, United States · live radar →
SFO San Francisco International Airport San Francisco, United States · live radar →
B739 Boeing 737-900ER Typical equipment · specs →

How much CO2 does UA1641 emit?

Worked from the great-circle distance and the fuel burn measured for Boeing 737-900ER, the aircraft normally flying this route. Carbon dioxide only - see the method below.

Distance flown3,883 km
AircraftBoeing 737-900ER
Fuel burn rate3.83 kg per km
Fuel burned14,868 kg
CO2, whole flight47.0 tonnes
Seats, typical layout178
Passengers carried148 at an 83% load factor
CO2 per passenger317 kg

Where that lands by cabin

The aircraft burns the same fuel whoever is aboard, so the cabins divide one total rather than each carrying their own. A seat's share is the floor it takes up, which is why an economy seat comes out below the 317 kg cabin average and a flat bed well above it.

Economy157 seats, 130 flown
262 kg CO2 per seat
Business21 seats, 17 flown
760 kg CO2 per seat

Taken whole, UA1641 emits what 783 trees take back out of the air in a year. One economy seat on it accounts for about the same carbon dioxide as driving a petrol car 1,867 km, or 9,070 km of the same journey by train.

How this is worked out. Fuel burn is read from published measurements of this type, taken at a 926 km sector, the only published sector for this type, applied to this route's 3,883 km unadjusted. It counts carbon dioxide only, and the cabin split assumes the layout typical of this size of aircraft. Read the full method, sources and caveats, or put UA1641 against another flight.

Other tracked flights from Washington

FlightRouteTypical aircraft
AS348Seattle (SEA) → Washington (IAD) Boeing 737-900ERAS348 flight tracker →
UA2804Washington (IAD) → Newark (EWR) Boeing 737 MAX 8UA2804 flight tracker →
B6338Orlando (MCO) → Washington (IAD) Airbus A320B6338 flight tracker →
ET338Addis Ababa (ADD) → Washington (IAD) Boeing 777-300ERET338 flight tracker →

Guides relevant to UA1641

Chosen from this route's distance, timing, aircraft, airline and airports.

How airlines plan routes This medium-haul sector shows how aircraft size and local demand shape a network.
Boeing versus Airbus The typical aircraft is built by Boeing; these visual clues help identify it.
Airline alliances explained United Airlines belongs to Star Alliance, which affects connections and codeshares.

Data sources and review

Reviewed 2026-07-29 by Flight-Tracker.net Editorial Team

The route and typical schedule are maintained reference data. Live ADS-B observations are evidence of receiver coverage, not proof of on-time performance. Always confirm the operating date and times with the airline.

Read our schedule and observation review process, or inspect the machine-readable reference dataset.

Put UA1641 on your own site

One script tag renders a live status card wherever you paste it. No iframe, no account, and it keeps working on its own.

UA1641 frequently asked questions

How long is the UA1641 flight?

Washington to San Francisco is 3,883 km (2,413 miles) in a straight line. Actual airborne time varies with winds, routing and holding.

What aircraft operates UA1641?

Typically a Boeing 737-900ER (full specifications), using roughly 71% of that type's published range.

Does UA1641 fly every day?

Frequency varies by season. Always confirm with the airline before travelling.

Can I track UA1641 live?

Yes. Whenever UA1641 is airborne and in receiver coverage the map above follows it live, with altitude, ground speed and heading. Between rotations, the seven-day log above shows where it has been.

More United Airlines flights to watch

FlightRouteTypical aircraft
UA51 Newark (EWR) → Madrid (MAD) 767 424ER UA51 flight tracker →
UA1230 Vancouver (YVR) → San Francisco (SFO) Airbus A321 UA1230 flight tracker →
UA33 Tokyo (NRT) → Los Angeles (LAX) Boeing 787-9 Dreamliner UA33 flight tracker →
UA1752 Newark (EWR) → Orlando (MCO) Airbus A321 UA1752 flight tracker →
UA2497 Chicago (ORD) → Boston (BOS) Airbus A321 UA2497 flight tracker →
UA2840 Hagåtña (GUM) → San Francisco (SFO) Boeing 737-800 UA2840 flight tracker →
UA534 Honolulu (HNL) → Los Angeles (LAX) Boeing 737-900ER UA534 flight tracker →
UA64 Newark (EWR) → Lisbon (LIS) Boeing 787-10 Dreamliner UA64 flight tracker →
UA3 Los Angeles (LAX) → Honolulu (HNL) Boeing 767-300ER UA3 flight tracker →
UA249 Charlotte (CLT) → Newark (EWR) Boeing 737 MAX 8 UA249 flight tracker →
UA2804 Washington (IAD) → Newark (EWR) Boeing 737 MAX 8 UA2804 flight tracker →
UA2012 Panama City (PTY) → Newark (EWR) Boeing 737-800 UA2012 flight tracker →
UA2437 New York (LGA) → Denver (DEN) Boeing 737-700 UA2437 flight tracker →
UA2249 Phoenix (PHX) → San Francisco (SFO) Boeing 737-700 UA2249 flight tracker →
UA194 San Francisco (SFO) → Munich (MUC) Boeing 777-200ER UA194 flight tracker →
UA2127 New York (LGA) → Chicago (ORD) Boeing 757-200 UA2127 flight tracker →
UA1265 Denver (DEN) → San Francisco (SFO) Boeing 737-800 UA1265 flight tracker →
UA1216 Newark (EWR) → Atlanta (ATL) 737-9 UA1216 flight tracker →
UA1034 Houston (IAH) → Panama City (PTY) 737MAX 9 UA1034 flight tracker →
UA1 San Francisco (SFO) → Singapore (SIN) Boeing 787-9 UA1 flight tracker →
UA857 San Francisco (SFO) → Shanghai (PVG) Boeing 777-300ER UA857 flight tracker →
UA863 San Francisco (SFO) → Sydney (SYD) Boeing 787-9 UA863 flight tracker →
UA232 Denver (DEN) → Chicago (ORD) McDonnell Douglas DC-10 UA232 flight tracker →
UA328 Denver (DEN) → Honolulu (HNL) Boeing 777-200 UA328 flight tracker →