The cheapest times to fly from SEA to REP are

  • January 8th to March 25th (except the week of January 22nd)
  • August 20th to December 9th

based on data collected exclusively by Champion Traveler across tens of millions of flights. Among all the dates above, the very cheapest time to fly from SEA to REP is early November. Prices can be as high as $1796 for Friday flights during mid December, or as low as $780 for Tuesday flights around early November.


When to Fly to Krong Siem Reap

Flying from Seattle, WA (SEA) to Siem Reap (REP) will usually cost between $838 to $1629 per person if booking more than four weeks in advance. On average the very cheapest time to fly is early November with an average ticket price of $855. Due to high demand the most expensive time to fly is mid December, with an average price of $1711. Planning your trip to low-cost times can easily save you $856 on economy flights and even more on first-class flights. Generally, any price below $1105 can be considered a good price for a round-trip SEA to REP flight.

See below for a graph of average weekly prices for the SEA to REP route. All prices are for round-trip tickets in USD.

SEA to REP Flight Prices

Compared to other flights, the SEA to REP flight is slightly more expensive than the average and costs about as much as the average flight leaving from Seattle. The average price per mile (for a direct flight) is $0.09, which is far below average.


Flight Prices by Day of the Week

Tuesday is usually the cheapest day to fly to REP, and Saturday the cheapest day to fly back into SEA. Fridays are the most expensive days to fly to Krong Siem Reap, and Mondays are the most expensive days to return to Seattle. Selecting flights on the least expensive days could save you up to $238 (15%) on this flight.

Departing prices are for round-trip flights returning on the day of departure. For example, a flight departing on Tuesday and returning a week later will cost an average of $1104. Return trip prices are from the REP to SEA flight, and often highlight the quality of our data in showing the same trend.

Departing Prices by Day

Departure Day Prices

Return Trip Prices by Day

Return Day Prices


Nonstop Flights and Layovers

Travelers looking to fly from SEA to REP can generally find a 1-layover flight. Because there is not usually a direct flight option the real-world direct flight time of 14 hour 14 minutes may not be realistic.


Alternative Nearby Airports

Champion Traveler tells you which airports are nearby and whether tickets might be cheaper alternative airports nearby. Sometimes it’s worth it to fly into a closer airport and then commute to your destination. Remember that there is not usually a nonstop flight from SEA to REP while comparing.

Destination alternative #1: Phnom Penh International Airport (PNH) in Phnom Penh

  • 146 miles (235 km) away from REP
  • Usually 23.21% less expensive than REP
  • 1-layover flights available

See SEA to PNH flights


Flight Hacking SEA to REP

Flight hacking is when you book two tickets instead of a layover, sometimes with different airlines. You will need to either bring only a carry-on bag (highly recommended) or leave yourself plenty of time to go through security again. Flight hacking is completely allowed, but airlines don’t always tell you the cheapest way to get from SEA to REP — but Champion Traveler does!

Hack #1: Kuala Lumpur (SEA > KUL > REP)

  • Price for both tickets: $885
  • Average savings: $220 (19.91%)

See SEA to KUL flights

Hack #2: Hong Kong (SEA > HKG > REP)

  • Price for both tickets: $900
  • Average savings: $206 (18.6%)

See SEA to HKG flights

Hack #3: Hanoi (SEA > HAN > REP)

  • Price for both tickets: $914
  • Average savings: $192 (17.33%)

See SEA to HAN flights


Flight Questions Answered

Still have questions about flying from SEA to REP? We’ve got answers.

Which airlines fly this route?

You can find 25 major airlines flying this route most often: Air Canada, Alaska, American, ANA, Asiana, Bangkok Airways, Cathay Dragon, Cathay Pacific, China Airlines, China Eastern, China Southern, Delta, Emirates, EVA Air, Hainan, JAL, Kenya Airways, KLM, Qantas, Shanghai Airlines, Singapore Airlines, THAI, United, Vietnam Airlines, Xiamen, and potentially more during busy seasons.

How far away is it from Siem Reap International Airport to Seattle/Tacoma International Airport?

The distance between the two airports is roughly 7361 miles or 11846 kilometers.

How long does it take to fly from SEA to REP?

The real-world flight time for a nonstop SEA to REP flight is about 14 hour 14 minutes.

How many flights go between Seattle, WA and Siem Reap?

It depends on the day of the week and the date, but a typical day might have around 82 available flights from SEA to REP.


Airport Location Info


Departing Airport

Origination code SEA
Origination airport name Seattle/Tacoma International Airport
City Seattle, WA
Country the United States
Latitude 47.5
Longitude -122.3

Return Airport

Destination code REP
Destination airport name Siem Reap International Airport
City Siem Reap
Country Cambodia
Latitude 13.4
Longitude 103.8


Other Resources

Please note that while we’ve worked hard to analyzed tens of millions of flights to get you this data, we do not calculate current live prices or guarantee pricing. Please see our partners using the links above for current offers.