Business class flights from Seattle (SEA) to Siem Reap (REP) start from $2,650 round-trip — up to 40% below published airline prices. The ~17 hours journey covers 7,363 miles, with 3 airlines offering lie-flat seats on this route. Best time to book: 3–6 months in advance for best fares.
SEA → REP
Seattle to Siem Reap Business Class
From$2,650
Route Overview
Starting From
$2,650 round-trip
Flight Duration
~17 hours
Distance
7,363 miles
Airlines
3 carriers
Best Value
Jan, Feb, Mar
Savings
Up to 60% off retail
Route Intelligence
Business Class from Seattle to Siem Reap
Siem Reap is the gateway to Angkor Wat and the wider Angkor Archaeological Park, one of the most extraordinary temple complexes anywhere, and it's the reason most Seattle travelers make this trip. Beyond Angkor, the town itself has grown into a genuinely pleasant base with a walkable old quarter, strong restaurant scene, and enough boutique hotels and spas to make a multi-day stay comfortable rather than just a temple-run pit stop. Given that Seattle to Siem Reap business class involves roughly 17 hours of flying plus a connection, the destination needs to earn that effort — and Angkor does.
Airlines & Cabin Experience
There's no nonstop from SEA, so every itinerary routes through a major Asian hub, and which hub you choose really shapes the experience. Singapore Airlines is our most-booked option on this route: their Business Class cabin runs a 1-2-1 lie-flat layout, the seats are wide and well-cushioned, and the Book the Cook program lets you pre-order specific dishes before departure, which matters a lot on a journey this long. Thai Airways' Royal Silk Class uses a staggered lie-flat 1-2-1 configuration through Bangkok, and the onboard service has a warmth to it that regular flyers on this route tend to mention — some Thai flights even offer inflight spa-style amenities. Cathay Pacific routes through Hong Kong with a reverse herringbone 1-2-1 cabin, which gives every passenger direct aisle access and a genuine sense of privacy; their Pier lounge in Hong Kong is also one of the better business lounges in Asia if you have a longer layover.
Pricing & Best Time to Fly
Pricing on Seattle to Siem Reap business class swings widely — our fares run $2,650 to $7,500 round-trip depending on airline, season, and how far out you book. That's a meaningful discount off retail, since we're working from consolidator inventory that doesn't show up on the usual booking sites. The lower end of that range typically comes from booking 3-4 months ahead during shoulder periods, while last-minute bookings or peak-season travel push toward the top. January through March and November-December are the strongest months to fly: this is Cambodia's dry season, temperatures at Angkor are far more tolerable for temple-walking, and airline award and consolidator space tends to open up more generously outside of the July-August rush.
Why Book Through BestBusinessClass.com
Practically speaking, this is a real ultra-long-haul with a connection, so seat selection matters as much as cabin choice. On Singapore Airlines, request seats toward the front of the business cabin for quieter rest; on Cathay's reverse herringbone, window seats give you the most privacy while aisle seats near the front board and deplane faster in Hong Kong. Build in at least 90 minutes for your connection regardless of carrier — Bangkok, Singapore, and Hong Kong airports are efficient, but immigration and gate distances can eat time. If Angkor Wat sunrise is on your list, plan your final arrival day with a buffer, since jet lag recovery after this many time zones is real and you don't want your first Angkor morning to be your groggiest.
Travel Tips
Whichever hub you choose, book early if you're targeting January-March travel, since that's when both leisure travelers and Cambodia's tourism season overlap most. Our Personal Travel Managers track fare drops across all three carriers and can tell you, route by route, which connection is running the best current wholesale pricing.
Airline Comparison
Singapore Airlines
Singapore Business
Lie-flat, 1-2-1
Award-winning cabin, Book the Cook dining
Read Full Review →
Thai Airways
Royal Silk Class
Lie-flat staggered, 1-2-1
Thai hospitality, spa treatments
Read Full Review →
Cathay Pacific
Cathay Business
Lie-flat reverse herringbone, 1-2-1
Hong Kong hub, Pier lounge
Read Full Review →Top Rated
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The Business Class Standard
Lie-Flat Guarantee
We only sell true Business Class. 180° fully flat beds on all long-haul routes, ensuring you arrive rested.
Premium Lounges
Access the world's finest lounges. Enjoy pre-flight dining, showers, and quiet workspaces before you board.
Priority Service
Skip the queues. Your ticket includes fast-track security, priority boarding, and premium baggage handling.
The Business Class Standard
Lie-Flat Guarantee
We only sell true Business Class. 180° fully flat beds on all long-haul routes, ensuring you arrive rested.
Premium Lounges
Access the world's finest lounges. Enjoy pre-flight dining, showers, and quiet workspaces before you board.
Priority Service
Skip the queues. Your ticket includes fast-track security, priority boarding, and premium baggage handling.
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