3 airlines go head-to-head on the SEA–LIS route. Compare seats, lounges, and fares from $2,400.
3 airlines fly business class from Seattle (SEA) to Lisbon (LIS), with round-trip fares ranging from $2,400 to $6,700. The average flight time is 10 hours. Delta Air Lines and TAP Air Portugal are the primary competitors on this route. The most affordable fares typically appear in January, February, March.
Seattle's transatlantic business travelers have three genuinely distinct experiences to weigh when booking business class from Seattle to Lisbon, and the differences go well beyond seat pitch. Delta One Suite, TAP Air Portugal Business Class, and United Polaris each represent a fundamentally different philosophy about what a ten-hour overnight flight should feel like — and choosing the wrong one for your priorities is an expensive mistake.
Delta's A350-operated Seattle departure is the product to beat on pure hardware. The Delta One Suite's closing privacy door is a meaningful differentiator on a red-eye, and the 1-2-1 configuration means every seat is a solo experience without negotiating window access with a travel companion. The Westin Heavenly bedding and Alessi-designed amenity kits hold up well against European carriers, and Delta's Seattle hub means smooth same-day connections from the Pacific Northwest. TAP, by contrast, offers something Delta cannot: a one-stop gateway into Lisbon's position as a springboard for southern Europe and the Azores, operated on the fuel-efficient A330neo with a staggered lie-flat that is genuinely comfortable but lacks the suite-style enclosure. TAP's dining leans authentically Portuguese — the Vinho Verde pours and bacalhau-influenced menus are a legitimate differentiator for travelers who consider the meal part of the destination. United Polaris on this routing is the pragmatist's choice: direct aisle access for every seat, a consistently executed soft product, and United's broad North American network making it the natural pick for anyone connecting through a hub like Chicago or Houston before positioning to Seattle.
On pricing, TAP historically surfaces the most competitive business class fares on this route, particularly in the January-through-March window when transatlantic demand softens and the airline aggressively fills premium cabins. Delta One tends to command a premium but occasionally releases strong saver awards for SkyMiles members, making it the insider play for points-savvy travelers willing to monitor availability. United Polaris sits reliably in the middle, with October and November yielding some of the best revenue fare reductions as summer crowds thin. One actionable tip: TAP's Lisboa Lounge at Humberto Delgado Airport on the return leg is a genuinely underrated experience — factor the full journey, not just the outbound, into your airline decision.
Suite seekers and light-sensitive sleepers should reach for Delta One without hesitation. Travelers who want the meal to tell a story should book TAP. Those prioritizing network flexibility and consistent reliability will find Polaris earns its reputation. Given how unpredictably fares shift on this routing across all three carriers, setting automated price alerts the moment your travel dates crystallize is the single highest-return action you can take.
| Airline | Product | Seat Type | Lounge | Alliance | Typical Fare |
|---|---|---|---|---|---|
Delta Air Lines DL | Delta One Suite | 1-2-1 suite with door | Delta One Lounge / Sky Club | SkyTeam | From $2,400 |
TAP Air Portugal TP | Business Class | Lie-flat seat | TAP Air Portugal Business Lounge | Star Alliance | From $2,400 |
United Airlines UA | Polaris Business | 1-2-1 direct aisle access | United Polaris Lounge | Star Alliance | From $2,400 |
Delta One Suite
1-2-1 suite with privacy door on A350 and 767-400
Business Class
Staggered lie-flat on A330neo and A321LR
Polaris Business
1-2-1 direct aisle access lie-flat seat
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Start Tracking — It's Free →3 airlines operate Business Class on this route: Delta Air Lines, TAP Air Portugal, United Airlines. The "best" depends on your priorities — some offer enclosed suites, others prioritize food and lounge access. Our comparison table above breaks down each airline's seat type, lounge, and typical fare so you can decide what matters most.
Business Class fares on this route typically range from $2,400 to $6,700 round-trip. Pricing varies significantly by airline, season, and advance purchase. The best months to find competitive fares are January, February, March.
Set up a free fare watchlist on BusinessClassSignal. We monitor Business Class fares across all 3 airlines on this route 24/7 and alert you the moment prices drop to your target budget. Most travelers save $1,500–$3,000+ per ticket by catching short-lived price drops.
The average flight time is approximately 10 hours. Business Class makes long-haul flights significantly more comfortable with lie-flat seats, premium dining, and priority services. The experience varies considerably between airlines — see our comparison above.