$354 Cheap flight deals from Seattle (SEA) to Siem Reap (SAI)

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Airfares from $354 One Way, $648 Round Trip from Seattle to Siem Reap

Prices starting at $648 for return flights and $354 for one-way flights to Siem Reap were the cheapest prices found within the past 7 days, for the period specified. Prices and availability are subject to change. Additional terms apply.

Sat, Jan 16 - Sat, Jan 23
SEA
Seattle
SAI
Siem Reap
$648 Roundtrip, found 23 hours ago
$648
Roundtrip
found 23 hours ago
Select Singapore Airlines flight, departing Sat, Jan 16 from Seattle to Siem Reap, returning Sat, Jan 23, priced at $648 found 23 hours ago
Sat, Jan 16 - Tue, Jan 26
SEA
Seattle
SAI
Siem Reap
$679 Roundtrip, found 23 hours ago
$679
Roundtrip
found 23 hours ago
Select Singapore Airlines flight, departing Sat, Jan 16 from Seattle to Siem Reap, returning Tue, Jan 26, priced at $679 found 23 hours ago
Sat, Jan 16 - Tue, Jan 26
SEA
Seattle
SAI
Siem Reap
$710 Roundtrip, found 23 hours ago
$710
Roundtrip
found 23 hours ago
Select Singapore Airlines flight, departing Sat, Jan 16 from Seattle to Siem Reap, returning Tue, Jan 26, priced at $710 found 23 hours ago
Thu, Apr 1 - Wed, May 5
SEA
Seattle
SAI
Siem Reap
$874 Roundtrip, found 1 day ago
$874
Roundtrip
found 1 day ago
Select Singapore Airlines flight, departing Thu, Apr 1 from Seattle to Siem Reap, returning Wed, May 5, priced at $874 found 1 day ago
Thu, Apr 1 - Wed, May 5
SEA
Seattle
SAI
Siem Reap
$915 Roundtrip, found 1 day ago
$915
Roundtrip
found 1 day ago
Select Singapore Airlines flight, departing Thu, Apr 1 from Seattle to Siem Reap, returning Wed, May 5, priced at $915 found 1 day ago

Siem Reap economy flight packages

Price found within the past 48 hours. Click for updated prices.
Royal Crown Hotel & Spa
4.5-star property

Royal Crown Hotel & Spa

9/10 Wonderful! (1,000 reviews)

Nov 12 - Nov 16

4 night stay

Seattle (SEA) to Siem Reap Angkor Intl. Airport (SAI)

United • Coach

Siem Reap Angkor Intl. Airport (SAI) to Seattle (SEA)

Bangkok Airways • Coach
Price was $1,618, price is now $1,177 per person
$1,177
per person
found 8 hours ago

Mane Hariharalaya
5.0-star property

Mane Hariharalaya

9.4/10 Exceptional! (50 reviews)

Nov 12 - Nov 16

4 night stay

Seattle (SEA) to Siem Reap Angkor Intl. Airport (SAI)

United • Coach

Siem Reap Angkor Intl. Airport (SAI) to Seattle (SEA)

Bangkok Airways • Coach
Save 100% on your flight
Price was $3,243, price is now $1,669 per person
$1,669
per person
found 8 hours ago

Raffles Grand Hotel d'Angkor
5.0-star property

Raffles Grand Hotel d'Angkor

9.6/10 Exceptional! (334 reviews)

Nov 12 - Nov 16

4 night stay

Seattle (SEA) to Siem Reap Angkor Intl. Airport (SAI)

United • Coach

Siem Reap Angkor Intl. Airport (SAI) to Seattle (SEA)

Bangkok Airways • Coach
Save 100% on your flight
Price was $14,185, price is now $8,453 per person
$8,453
per person
found 8 hours ago
Beautiful hotel. Not very new but well kept

Reviewed on Jul 19, 2026

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See all available trips from Seattle to Siem Reap
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Siem Reap packages with premium economy flights

Price found within the past 48 hours. Click for updated prices.
Mane Hariharalaya
5.0-star property

Mane Hariharalaya

9.4/10 Exceptional! (50 reviews)

Oct 31 - Nov 4

4 night stay

Seattle (SEA) to Siem Reap Angkor Intl. Airport (SAI)

United • PremiumEconomy

Siem Reap Angkor Intl. Airport (SAI) to Seattle (SEA)

Singapore Airlines • PremiumEconomy
Price was $4,247, price is now $2,673 per person
$2,673
per person
found 1 day ago

Mane Family Vacation
5.0-star property

Mane Family Vacation

9.6/10 Exceptional! (28 reviews)

Oct 31 - Nov 4

4 night stay

Seattle (SEA) to Siem Reap Angkor Intl. Airport (SAI)

United • PremiumEconomy

Siem Reap Angkor Intl. Airport (SAI) to Seattle (SEA)

Singapore Airlines • PremiumEconomy
Save 100% on your flight
Price was $6,259, price is now $3,244 per person
$3,244
per person
found 1 day ago

Raffles Grand Hotel d'Angkor
5.0-star property

Raffles Grand Hotel d'Angkor

9.6/10 Exceptional! (334 reviews)

Oct 31 - Nov 4

4 night stay

Seattle (SEA) to Siem Reap Angkor Intl. Airport (SAI)

United • PremiumEconomy

Siem Reap Angkor Intl. Airport (SAI) to Seattle (SEA)

Singapore Airlines • PremiumEconomy
Price was $3,287, price is now $2,765 per person
$2,765
per person
found 1 day ago
Beautiful hotel. Not very new but well kept

Reviewed on Jul 19, 2026

Don't see what you're looking for?
See all available trips from Seattle to Siem Reap
View all trips

More About Flying To Siem Reap from Seattle

Frequently asked questions

What is the cheapest day of the week to fly?
Consider flying out early in the week to save on your airfare. Orbitz data from 2021 shows that Monday is the cheapest day to depart, followed by Tuesday. Saturday showed the highest average ticket prices likely because many travelers prefer to start their vacation on a weekend.
What is the cheapest month to fly?
We won't keep you guessing, according to Orbitz data from 2021, the cheapest month to fly is February. Perfect for those who need a weekend getaway, or just a break from it all in the shortest month of the year. Be aware that the most expensive time to fly is during the height of summer in July, and in the holiday month of December.*According to flight demand on Orbitz.com from January to December 2021. Savings are subject to change based on departure location, date and destination.