transpacific · 11h 00m · 8,305 km
Seattle to Seoul
2 airlines · 2 aircraft ranked
In business class, Delta's Delta One Suite (A350-900) leads the field with a 8.3/10.Delta is the only carrier offering premium economy on this route, scoring 5.5/10.
Quick pick
Fly Delta. It has a wider seat (22" vs 21") and free Wi-Fi (paid on Korean Air).
If fares are comparable, this is the better cabin.
Fly Delta. It has free Wi-Fi (paid on Korean Air).
If prices are similar, go with this one.
Select two airlines to compare head-to-head
Data verified June 2026
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Airlines on this route
Route insights
- In business class, Delta's Delta One Suite (A350-900) leads the field with a 8.3/10.
- Delta is the only carrier offering premium economy on this route, scoring 5.5/10.
- In economy, Delta's Main Cabin (A350-900) leads the field with a 5.1/10.
Frequently asked
Which is better in business: Delta or Korean Air on SEA-ICN?
Delta One Suite (Delta Air Lines, A350-900) edges out Prestige Suite 2.0 (Korean Air, 787-10) in business, scoring 8.3/10 vs 7.6. The deciding factor: Free Wi-Fi vs Paid Wi-Fi.
Which is better in economy: Delta or Korean Air on SEA-ICN?
Main Cabin (Delta Air Lines, A350-900) edges out Economy (Korean Air, 787-10) in economy, scoring 5.1/10 vs 4.5. The deciding factor: Free Wi-Fi vs Paid Wi-Fi. Korean Air fights back on legroom.
What are the best seats in Delta Delta One Suite on SEA-ICN?
Best: Odd-numbered window seats (1A, 3A, 5A, 7A, 9A and right-side equivalents) are closer to the window and farther from the aisle for maximum privacy. Center pairs with the privacy divider lowered are excellent for couples. Row 1 has the most open space. Avoid: Even-numbered window seats are closer to the aisle with less separation from foot traffic. Rows 8-9 are nearest to the galley between business and premium select. 32 suites with sliding doors and do-not-disturb indicators. 18-inch seatback screens. 4 lavatories for business class, significantly better than the A330-900neo's 2 lavatories. The A350 is considered Delta's flagship long-haul aircraft. Dine-on-demand service on ultra-long-haul routes.
What are the best seats in Delta Delta Premium Select on SEA-ICN?
Best: Row 20 has the most legroom as the bulkhead row with extra separation from the galley. Window doublets (A-B and H-J) are ideal for couples. Row 20 is the clear top pick unless noise sensitivity is a concern. Avoid: Center seats in the 4-abreast middle section (D-E-F-G), especially E and F which have no aisle access. Row 25 may have limited recline near the economy partition. 48 seats across 6 rows in a 2-4-2 layout. Premium amenity kit, adjustable headrest with privacy wings, dedicated flight attendant, and enhanced meal service. The outside doublets avoid the middle-seat problem entirely.
What are the best seats in Delta Main Cabin on SEA-ICN?
Best: Delta Comfort+ rows (approximately 30-35, 36 seats) offer 34 inches of pitch with priority boarding and dedicated bins. Row 30 bulkhead has the most legroom. Avoid: Middle seats in any 3-abreast section on long-haul flights. Last 3 rows near rear galley and lavatories. Seat 55E is consistently rated poorly. 3-3-3 economy layout at 17.4-inch width is the A350's weakest point relative to competitors. 36 seats are Delta Comfort+ with 34-inch pitch. Remaining 190 Main Cabin seats have 31-32 inches of pitch. Complimentary meal service on all international flights. Seatback IFE and USB/AC power throughout. Delta Sync free Wi-Fi.
What are the best seats in Korean Air Prestige Suite 2.0 on SEA-ICN?
Best: Window suites for maximum privacy with the sliding doors. Avoid: Center pairs share a divider that can be lowered. Korean Air's newest business product. 1-2-1 all-aisle-access with sliding doors. 24-inch IFE. Bluetooth audio. Viasat wifi (paid, slow on Pacific routes). USB-C + AC + wireless charging.