Business class flights from Detroit (DTW) to Siem Reap (REP) start from $2,650 round-trip — up to 40% below published airline prices. The ~17 hours journey covers 8,567 miles, with 3 airlines offering lie-flat seats on this route. Best time to book: 3–6 months in advance for best fares.
DTW → REP
Detroit to Siem Reap Business Class
From$2,650
Route Overview
Starting From
$2,650 round-trip
Flight Duration
~17 hours
Distance
8,567 miles
Airlines
3 carriers
Best Value
Jan, Feb, Mar
Savings
Up to 60% off retail
Route Intelligence
Business Class from Detroit to Siem Reap
Siem Reap draws travelers for one reason above all: Angkor Wat and the surrounding temple complexes, which reward the effort of getting there with some of the most extraordinary archaeological sites in Asia. Beyond the temples, the town itself has grown into a genuinely pleasant base, with a walkable old quarter, a strong food scene built around Khmer cuisine, and enough boutique hotels and spas to make a multi-day stay comfortable rather than just a temple-running mission. It's a destination that rewards arriving rested, which matters a great deal given how far Detroit to Siem Reap business class travelers have to fly to get there.
Airlines & Cabin Experience
There's no nonstop option on this route, so the real decision is which connecting hub and cabin you want to spend your layover in. Singapore Airlines routes through Singapore and is the standout choice for most travelers — their business class is a proper 1-2-1 lie-flat product, and Book the Cook lets you pre-order your main meal, which is a small thing that makes a 17-hour-plus journey feel less grim. Thai Airways connects through Bangkok in Royal Silk Class, a staggered lie-flat seat with a warmer, more personal service style and the option of a pre-flight spa treatment in Bangkok — a nice way to reset before the final hop to Siem Reap. Cathay Pacific routes through Hong Kong with a reverse herringbone seat, direct aisle access from every seat, and access to the Pier lounge, one of the better business lounges in Asia if you have a longer connection. All three are strong; the choice often comes down to which layover city you'd rather explore or which lounge experience matters more to you.
Pricing & Best Time to Fly
Because this is an ultra-long-haul itinerary with at least one connection, pricing swings more than on simpler routes, and that's exactly where consolidator fares earn their keep. Retail business class fares on Detroit to Siem Reap business class itineraries routinely price above $8,000-9,000 round-trip, while our wholesale fares run $2,650 to $7,500 depending on airline, season, and how far ahead you book. The lower end of that range typically means Thai Airways or Cathay Pacific in shoulder season with some date flexibility; the higher end reflects Singapore Airlines during peak months or last-minute bookings. Because these are consolidator fares not listed on Expedia or Google Flights, availability moves quickly, so booking 2-3 months out gives our Travel Managers the best shot at premium seat selection.
Why Book Through BestBusinessClass.com
January through March and November through December are the best months to fly, both for weather in Cambodia — cooler, drier conditions versus the brutal heat and monsoon rains of April through October — and for fare availability, since airlines release more premium inventory outside peak Southeast Asia holiday travel. Practically speaking, plan for a total journey of 20-24 hours gate to gate once you factor in a connection, and build in at least a 2-hour buffer at your hub airport since misconnections on this routing mean a full extra day lost. Whichever carrier you choose, request an aisle seat if you plan to move around, and consider breaking the journey with a one-night stopover in Singapore, Bangkok, or Hong Kong — all three cities are worth a look, and it makes the whole trip far more tolerable than pushing straight through.
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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