What aircraft does DL20 use?

Delta Air Lines flight DL20 operates on an 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 252 total seats across 4 cabin classes: First, Business, Premium Economy, Economy.

What cabin classes are available on this aircraft?

This Airbus A330-900 offers 4 cabin classes: First, Business, Premium Economy, Economy. Seat distribution: 34 First seats, 29 Business seats, 21 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.

What is the seat map for DL20?

The seat map for DL20, Delta Air Lines from Seattle (SEA) to London (LHR), is an Airbus A330-900 in a 4-class configuration with 252 seats. This is the typical configuration for the route, not a verified departure.

What aircraft is DL20?

DL20 is scheduled as an Airbus A330-900 (4-class, 252 seats).

Flight: DL20
Airline: Delta Air Lines
Route: Seattle (SEA) to London (LHR)
Aircraft: Airbus A330-900
Configuration: 4-class, 252 seats

DL20 Seat Map

● On time

Delta Air Lines · Airbus A330-900 · Sat, 31 Oct 2026

Depart

SEA · Seattle

10h 8m

4,786 mi

Arrive

LHR · London

+ Seat alert

252 seats across 4 cabins

F · First

0/34

J · Business

0/29

W · Premium Economy

0/21

Y · Economy

0/168

Filter:

First Business Premium Economy Economy Extra legroom / exit Occupied Blocked

View:

Some cabin classes show aircraft layout only — live seat availability could not be retrieved from the airline for this date.

First · Business · Premium · Economy · Rows 1–51

100%

Pinch to zoom • Double-tap to zoom in

First

Business

Premium Economy

Economy

First

Business

Premium Economy

Economy

C

G

A

C

G

J

A

C

G

J

A

C

G

J

A

C

G

J

A

C

G

J

A

C

G

J

A

C

G

J

A

C

G

J

A

C

G

J

A

C

G

J

A

C

G

J

A

C

G

J

A

C

G

J

A

C

G

J

A

C

G

J

A

A

B

C

D

G

H

J

A

B

C

D

G

H

J

A

B

C

D

G

H

J

A

B

C

D

F

G

H

J

A

B

C

D

F

G

H

J

A

B

C

D

F

G

H

J

A

B

C

D

F

G

H

J

A

B

C

D

F

G

H

J

A

B

C

D

F

G

H

J

A

B

C

D

F

G

H

J

A

B

C

D

F

G

H

J

A

B

C

D

F

G

H

J

A

B

C

D

F

G

H

J

A

B

C

D

F

G

H

J

A

B

C

D

F

G

H

J

A

B

C

D

F

G

H

J

A

B

C

D

F

G

H

J

A

B

C

D

F

G

H

J

A

B

C

D

F

G

H

J

A

B

C

D

F

G

H

J

A

B

C

D

F

H

J

A

B

C

D

F

H

J

A

B

C

D

F

H

J

A

B

C

D

F

H

J

A

B

H

J

Get seat alerts

Get Seat Alerts

Ask your AI assistant next time

Connect FlightSeatmap to Claude, ChatGPT, Cursor or VS Code and get seat maps without leaving the conversation.

Add to Cursor Add to VS Code Claude & ChatGPT setup

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 31, 2026

Aircraft: Airbus A330-900

Airline Routes: View Delta Air Lines route map

Change Flight Date

Sign Up Free to Unlock

Best seat recommendations
Cached seatmaps are always free
Full seat details and legroom info

Already have an account? Sign in

Want Live Seat Availability?

Subscribe for real-time seat availability and pricing.

View Plans

Flight Route Map

Explore More Routes:

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: 252 seats

Economy: 168

Premium Economy: 21

Business: 29

First: 34
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.

Compare

Long-press seats to add them for comparison

Compare seats

Click and hold on seats to add them for comparison

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

Share Your Experience

Earn 1-3 Credits

Help fellow travelers by sharing your experience!

Credit Rewards:

• Basic review: 1 credit
• Detailed review (100+ words): +1 credit
• Add photos: +1 credit

No reviews yet. Be the first to share your experience.

Airbus A330-900 Seat Map

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

View seat map

Other Flights from SEA to LHR

BA48

British Airways

DL20

Delta Air Lines

VS106

Virgin Atlantic Airways

More Delta Air Lines Flights

AKL → LAX

AMS → ATL

AMS → ATL

AMS → DEL

AMS → DTW

DL49-2025-08-12-2025-08-04

AMS → JFK

View all Delta Air Lines flights →

Questions

Frequently Asked Questions

Live seats

Flying this route? See which seats are open on your flight

Search your flight number free. Live seats and a seat alert for that flight cost $4.99 once with a Trip Pass, or $8.99/mo for every trip.

Find my flight Start free trial →

7-day money-back guarantee · Cancel anytime