How are the cabins arranged by row and seat pattern on United Airlines UA939?

United Polaris® is in rows 1-17 with a 1-2-1 layout, and United Premium Plus is in rows 20-24 with a 2-3-2 layout. Economy is in rows 30-44 with a 3-3-3 layout, except rows 30-31, which are 3-0-3, and row 44, which is 0-3-0.

What is the average seat rating on UA939?

The 222 seats on the United Airlines Boeing 787-9 flying UA939 average 5.8 out of 10 for comfort. By cabin: United Polaris® 6.0, United Premium Plus 5.5 and Economy 5.7. 4 seats rate Good or better, and 23 rate below average.

What are the legroom and seat width measurements in United Premium Plus on UA939?

United Premium Plus has 38" of legroom and a seat width of 19".

What route does UA939 fly?

UA939 is the United Airlines flight from London (LHR, London Heathrow) to San Francisco (SFO, San Francisco International), flown on the Boeing 787-9. It takes about 11h 25m for 8,616 km (5,354 miles), estimated from the great-circle distance. The return flight, UA930, flies San Francisco to London.

Which United Premium Plus seats on UA939 are marked as having extra legroom?

The extra-legroom seats are 20A, 20C, 20D, 20E, 20F, 20J, and 20L.

Can I check real-time seat availability on UA939?

Yes. Open UA939 in the live seat map and choose your travel date to see which seats are still open on that day, each coloured by its comfort score.

What Wi-Fi, power, and entertainment are listed for Economy on United Airlines UA939?

Economy is Wi-Fi enabled, has AC/USB power available, and offers free on-demand entertainment.

UA939 seat map

United Airlines Boeing 787-9, 3 classes, from London (LHR) to San Francisco (SFO)

Departs: London (LHR); London Heathrow, United Kingdom
Arrives: San Francisco (SFO); San Francisco International, United States
Flight time: About 11h 25m; Estimated from 8,616 km (5,354 miles)
Aircraft: Boeing 787-9; 3 classes, 1 deck

Your flight date

Check live availability

UA939 is the United Airlines flight from London (LHR) to San Francisco (SFO), scheduled on a Boeing 787-9 with 222 seats in 3 classes: 64 in United Polaris®, 35 in United Premium Plus and 123 in Economy. The best seats are 1A in United Polaris®, 21A in United Premium Plus and 30C in Economy. Avoid row 44 at the back of Economy: limited recline, near the lavatories and the galley.

UA939 interactive seat map

Select a seat for its comfort score and what to watch out for. Colours show comfort, not availability.

Seat scores on UA939

Covers all 222 seats on the aircraft.

Excellent9.0+0 seats
Good7.0 to 8.94 seats
Fair5.0 to 6.9195 seats
Below average3.0 to 4.912 seats
Poorunder 3.011 seats

Scores weigh legroom, recline, window position and distance from galleys, lavatories and exits. Seat-map glossary

Best in United Polaris®
Fair6.8 / 10
Window seat
Best in United Premium Plus
Fair6.5 / 10
Window seat, wing in window
Best in Economy
Good8.8 / 10
Aisle seat, extra legroom, exit row, near lavatory, near galley

Seat data verified September 20, 2026. How we verify seat data

Which plane is UA939 on?

The aircraft and layout our seat map for UA939 comes from.

Date	Mon, Sep 21
Aircraft	Boeing 787-9
Layout	64J, 35W, 123Y (222 seats)

Airlines can swap planes close to departure, so confirm the aircraft at check-in.

UA939 airports

Where the flight leaves from and lands.

Departure: London Heathrow LHR; London, United Kingdom
Arrival: San Francisco International SFO; San Francisco, United States

Seats by cabin on UA939

How the 222 seats on this aircraft split by cabin.

United Polaris®64 seats
United Premium Plus35 seats
Economy123 seats

Open seats change daily. Check live availability for your date

Best seats on UA939

The top seats in every cabin, the ones to skip, and the pick for what matters to you.

Best seats on every aircraft

Comfort score out of 10Excellent9.0+Good7.0 to 8.9Fair5.0 to 6.9Below average3.0 to 4.9Poorunder 3.0

United Polaris®

Rows 1 to 17, 64 seats

Top picks

Window seatFair6.8 / 10
Window seatFair6.8 / 10
Aisle seatFair6.8 / 10

Seats to avoid

Window seat, misaligned windowBelow average4.2 / 10
Window seat, misaligned windowBelow average4.2 / 10

Best for

Window
Aisle
Sleep
Couples

United Premium Plus

Rows 20 to 24, 35 seats

Top picks

Window seat, wing in windowFair6.5 / 10
Window seat, wing in windowFair6.5 / 10
Window seat, wing in windowFair6.5 / 10

Seats to avoid

Window seat, near lavatory, near galleyPoor2.5 / 10
Window seat, near lavatory, near galleyPoor2.5 / 10
Aisle seat, near lavatory, near galleyBelow average3.4 / 10

Best for

Window
Aisle
Extra legroom
Sleep
Couples

Economy

Rows 30 to 44, 123 seats

Top picks

Aisle seat, extra legroom, exit row, near lavatory, near galleyGood8.8 / 10
Aisle seat, extra legroom, exit row, near lavatory, near galleyGood8.8 / 10
Middle seat, extra legroom, exit row, near lavatory, near galleyGood8.8 / 10

Seats to avoid

Aisle seat, limited recline, near lavatoryPoor2.5 / 10
Middle seat, limited recline, near lavatoryPoor2.5 / 10
Aisle seat, limited recline, near lavatoryPoor2.5 / 10

Best for

Window
Aisle
Extra legroom
Sleep
Couples

Row-by-row notes for UA939

The rows worth knowing about before you choose, from the Boeing 787-9 cabin layout. New to terms like bulkhead or pitch? See the seat-map glossary.

Row 1United Polaris®. First row of the cabin.
Row 9United Polaris®. Near the lavatories and the galley.
Row 17United Polaris®. Last row of the cabin.
Row 20United Premium Plus. First row of the cabin: extra legroom; no floor storage.
Row 24United Premium Plus. Last row of the cabin: near the lavatories and the galley.
Row 30Economy. First row of the cabin and an exit row: extra legroom; near the lavatories and the galley, no floor storage and tray table in the armrest.
Row 43Economy. Limited recline, near the lavatories.
Row 44Economy. Last row of the cabin: limited recline, near the lavatories and the galley.

Cabins on UA939

Layout, legroom and amenities in each class on the United Airlines Boeing 787-9.

Compare Wi-Fi and entertainment across airlines

United Polaris®

Rows 1 to 17, 64 seats

Layout: 1-2-1
Pitch: 42"
Width: 21"
Recline: 180°

Lie-flat seat. Sold as United Polaris Studio® and United Polaris®.

Wi-Fi enabled
AC/USB power
Free on demand entertainment

United Premium Plus

Rows 20 to 24, 35 seats

Layout: 2-3-2
Pitch: 38"
Width: 19"
Recline: 6"

Standard seat with 6" of recline.

Wi-Fi enabled
AC/USB power
Free on demand entertainment

Economy

Rows 30 to 44, 123 seats

Layout: 3-3-3
Pitch: 31"
Width: 16.55-17.6"
Recline: 3"

Standard seat with 3" of recline. Sold as United Economy Plus® and Economy.

Wi-Fi enabled
AC/USB power
Free on demand entertainment

UA939 questions

Flying UA939? Answered.

The aircraft, the cabins and the seats on this flight, answered from its seat map data.

The highest-rated seat on UA939 is 30C in Economy, with a comfort score of 8.8 out of 10: aisle seat, extra legroom, exit row, near lavatory, near galley. In the other cabins, the best seats are 1A in United Polaris® (6.8) and 21A in United Premium Plus (6.5).

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