Business class flights from San Francisco (SFO) to Siem Reap (REP) start from $2,650 round-trip — up to 40% below published airline prices. The ~17 hours journey covers 7,813 miles, with 3 airlines offering lie-flat seats on this route. Best time to book: 3–6 months in advance for best fares.
SFO → REP
San Francisco to Siem Reap Business Class
From$2,650
Route Overview
Starting From
$2,650 round-trip
Flight Duration
~17 hours
Distance
7,813 miles
Airlines
3 carriers
Best Value
Jan, Feb, Mar
Savings
Up to 60% off retail
Route Intelligence
Business Class from San Francisco to Siem Reap
Siem Reap draws travelers for one overwhelming reason: Angkor. The temple complex here, anchored by Angkor Wat but spreading across dozens of sites including Ta Prohm's jungle-strangled ruins and the stone faces of Bayon, is one of the great archaeological landscapes anywhere, and most visitors give it three to five days minimum. Beyond the temples, Siem Reap itself has grown into a genuinely enjoyable base — a walkable old quarter, a strong boutique hotel scene, sunset boat trips on Tonle Sap over the floating villages, and Khmer cooking that's distinct from its Thai and Vietnamese neighbors. It's a serious, rewarding trip, which is exactly why the flight matters.
Airlines & Cabin Experience
There's no nonstop from San Francisco, so San Francisco to Siem Reap business class routes all run through a major Asian hub, and which hub you pick shapes the whole trip. Singapore Airlines flies SFO to Singapore nonstop, then a short hop up to Siem Reap — their Singapore Business product is lie-flat in a 1-2-1 layout, and the Book the Cook program lets you pre-order dishes like Hainanese chicken rice before you even board. Thai Airways routes through Bangkok, with Royal Silk Class offering a staggered lie-flat seat and the kind of unfussy, attentive service Thai is known for, plus on some aircraft an onboard spa-style refresh. Cathay Pacific connects via Hong Kong, and its reverse herringbone seat is one of the better business products flying to Asia, paired with access to the Pier lounge in Hong Kong if your layover allows.
Pricing & Best Time to Fly
On a route this long, the connection city becomes part of the trip, not just a technicality. Singapore's Changi and Hong Kong's HKIA are both excellent for a stretch-your-legs layover with real lounges and shopping, while Bangkok gives you the option of breaking the journey with an overnight if your schedule allows — worth considering given the total door-to-door time on this itinerary often runs past 24 hours once you factor in connection time.
Why Book Through BestBusinessClass.com
On pricing, our consolidator fares for San Francisco to Siem Reap business class run $2,650 to $7,500 round trip depending on airline, season, and how far ahead you book, and that's typically 30 to 60% below what you'd see booking directly with the airline for the same seat. The wide range reflects real seasonal swings — January through March and November through December are peak demand months because that's dry season in Cambodia, with comfortable daytime temperatures for temple-hopping and none of the monsoon humidity that hits mid-year. Fares in that window sit toward the higher end of our range, so booking 3 to 4 months out gives our Travel Managers the most inventory to work with across all three carriers. If your dates are flexible, shoulder weeks just before or after peak season often unlock meaningfully lower fares on the same cabins.
Travel Tips
Practically speaking, pack for a long day: bring noise-cancelling headphones, request an aisle seat if you plan to move around during the 15+ hour transpacific segment, and use the layover to shower and eat something substantial rather than just sitting in a lounge. Cambodia requires a visa, but the e-visa process is quick and can be done online before you fly, or on arrival at Siem Reap–Angkor International Airport, which is small and efficient by international standards. Given the length of this itinerary, business class isn't a luxury here so much as a way to actually arrive functional for the temples the next morning.
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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