What aircraft does DL20 use?

Delta Air Lines flight DL20 operates on a Airbus A330-900 from SEA to LHR.

How long is the DL20 flight?

The estimated flight time for DL20 from SEA to LHR is approximately 10h 8m covering 7,702 km (4,786 miles).

How many seats does this Airbus A330-900 have?

This Delta Air Lines Airbus A330-900 has 281 total seats across 4 cabin classes: Business, First, Premium Economy, Economy.

What cabin classes are available on this aircraft?

This Airbus A330-900 offers 4 cabin classes: Business, First, Premium Economy, Economy. Seat distribution: 29 Business seats, 28 First seats, 56 Premium Economy seats, 168 Economy seats.

What route does DL20 fly?

Delta Air Lines flight DL20 operates from SEA (Seattle–Tacoma International Airport) to LHR (London Heathrow Airport), connecting Seattle and London.

How do I choose the best seat?

The best seat depends on your priorities. For extra legroom, choose seats near emergency exits or bulkhead rows. For quick boarding/deplaning, select seats near the front. Avoid seats near lavatories or galleys if you prefer a quieter flight. Window seats offer views and a wall to lean against, while aisle seats provide easier access to move around.

What do the different seat colors mean?

Green seats are typically available for selection, red seats are occupied or blocked, yellow/orange seats may have restrictions or extra fees, and blue seats often indicate premium or preferred seating with additional charges. Hover over any seat to see specific details and pricing.

Can I change my seat after booking?

Yes, most airlines allow seat changes after booking, though fees may apply depending on your fare type and desired seat. You can typically change seats through the airline's website, mobile app, or by calling customer service. Some seats become available closer to departure as the airline releases blocked inventory.

When is the best time to select seats?

The best time varies by strategy. Book immediately after purchasing your ticket for the widest selection, or wait until 24 hours before departure when airlines often release blocked premium seats. For popular routes, early selection is recommended. Our seat alerts can notify you when preferred seats become available.

Are the seat maps updated in real-time?

Our flight seat maps are updated regularly throughout the day to reflect current availability. However, seat availability can change rapidly, especially close to departure. We recommend checking the airline's official website for the most up-to-date information when making your final selection.

What if my preferred seat isn't available?

You can also check back periodically as seats often open up closer to departure when other passengers make changes or when the airline releases additional inventory.

DL20 Seat Map

● On time

Delta Air Lines · Airbus A330-900 · Thu, 23 Oct 2025

Depart

SEA · Seattle

10h 8m

4,786 mi

Arrive

LHR · London

+ Seat alert

F · First

6/28

J · Business

12/29

W · Premium Economy

34/56

Y · Economy

91/168

Filter:

First Business Premium Economy Economy Extra legroom / exit Occupied Blocked

View:

First · Business · Premium · Economy · Rows 1–58

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Get seat alerts

Top picks · Business

Highest-scoring available seats on this aircraft

Score 71 #1

Window view · Easy aisle access

Aisle Business

32C

Score 68 #2

Easy aisle access · Near wings (smoother ride)

Aisle Premium Economy

31G

Score 68 #3

Easy aisle access · Near wings (smoother ride)

Aisle Premium Economy

35J

Score 68 #4

Window view · Near wings (smoother ride)

Window Premium Economy

Get Seat Alerts

DL20 Flight Details

Flight Number: DL20

Origin:

(Seattle–Tacoma International Airport, Seattle)

Destination:

(London Heathrow Airport, London)

Distance: 7,702 km (4,786 mi)

Est. Duration: 10h 8m

Flight Date: October 23, 2025

Aircraft: Airbus A330-900

Airline Routes: View Delta Air Lines route map

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View Plans

Flight Route Map

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View flights from SEA View flights to LHR View Delta Air Lines route map

Aircraft Configuration

Aircraft Details

Seating info & configuration

Airline: Delta Air Lines (DL)
Aircraft: Airbus A330-900
Seating: Main Deck: 281 seats

Economy: 168

91 27 50

54% Available

Premium Economy: 56

34 22 0

61% Available

Business: 29

12 17 0

41% Available

First: 28

6 22 0

21% Available
Legend: Seat Status

Blocked

Occupied

Standard

Cabin Classes

First

Business

Premium Economy

Economy

Extra legroom / exit

Features

Exit door

WC Lavatory

GALLEY Galley

CREW Crew area

Delta Air Lines Airbus A330-900 seat map layout for flight DL20 from SEA to LHR — Reference layout

This Airbus A330-900 operates Delta Air Lines flight DL20 from Seattle (SEA) to London (LHR). Browse the interactive seat map above to find the best seats for your journey, view real passenger reviews, and explore detailed cabin configurations to make an informed decision for your flight.

Best Seats on DL20

Based on legroom, location, and passenger preferences

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Best Window Seats

Seat 7J Business
Seat 35J Premium Economy
Seat 56J Economy

Best Aisle Seats

Seat 7J Business
Seat 32C Premium Economy
Seat 31G Premium Economy

Quietest Seats

Seat 7J Business
Seat 30C Premium Economy
Seat 31C Premium Economy

Recommendations based on seat characteristics, cabin position, and proximity to facilities. Availability may vary by date.

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Seat Selection Assistance

Seat Alerts Require Payment

Seat alerts are available to users with a paid plan or credits. This feature monitors seat availability and notifies you when your preferred seats become available.

Reviews

Passenger Reviews for DL20

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Airbus A330-900 Seat Map

Full Delta Air Lines Airbus A330-900 seating chart, cabin layout, and seat reviews.

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