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Phnom Penh

$2,334+ Cheap flights from Seattle (SEA) to Phnom Penh (PNH)

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 9/1. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — PNH
Jun 7 — Jun 141
Sun 6/7
Sun 6/14
1 adult, Economy
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Cheap flight deals from Seattle to Phnom Penh

Cheapest flights from Seattle to Phnom Penh
Explore the most affordable flight options available from Seattle to Phnom Penh. Find the lowest fares from popular airlines and budget airlines, with prices last updated on May 8, 2026.

This British Airways deal was found by Cheapflights users on 5/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/11:30 pm
SEA
-
PNH
2 stops54h 30m
British Airways
Thu 10/16:20 pm
PNH
-
SEA
2 stops38h 05m
British Airways
Deal found 5/6$2,334
This CheapOair deal was found by Cheapflights users on 5/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/18:20 pm
SEA
-
PNH
3 stops47h 40m
British Airways
Tue 9/16:20 pm
PNH
-
SEA
3 stops43h 30m
British Airways
Deal found 5/6$2,723

Find flight deals from Seattle to Phnom Penh

Discover tips and strategies to find the most affordable flight options for your journey from Seattle (SEA) to Phnom Penh (PNH). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated May 8, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$2,334
(British Airways)

Popular in

June

Cheapest in

September

Average price

$1,399
Provider with most accurate pricing for Seattle/Tacoma Intl-Phnom Penh Pochentong flight deals.
Search Deals
Provider most trusted by Cheapflights users for Seattle/Tacoma Intl-Phnom Penh Pochentong flights.
Search Deals
From Seattle/Tacoma Intl to Phnom Penh Pochentong
Search Deals
Highest demand for flights based on searches. 24% potential increase in price ($339 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($40 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in May 2026
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Seattle to Phnom Penh that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated May 8, 2026.
Use the filters below to find and compare flights from Seattle to Phnom Penh that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

SeattlePhnom Penh

SEA - PNH

SEAPNH

Seattle/Tacoma Intl

Tue 9/1

1:30 pm-10:00 am

2 stops54h 30m

Phnom Penh Pochentong

Thu 10/1

6:20 pm-6:25 pm

2 stops38h 05m

$2,334
Quickest round-trip

SeattlePhnom Penh

SEA - PNH

SEAPNH

Seattle/Tacoma Intl

Sat 8/1

8:20 pm-10:00 am

3 stops47h 40m

Phnom Penh Pochentong

Tue 9/1

6:20 pm-11:50 pm

3 stops43h 30m

$2,723
Cheapest one-way

SeattlePhnom Penh

SEA - PNH

SEAPNH

Seattle/Tacoma Intl

Tue 9/15

8:20 pm-10:00 am

2 stops47h 40m

$6,737
Quickest one-way

SeattlePhnom Penh

SEA - PNH

SEAPNH

Seattle/Tacoma Intl

Fri 7/24

9:45 pm-10:00 am

2 stops46h 15m

$6,737

SeattlePhnom Penh

SEA - PNH

SEAPNH

Seattle/Tacoma Intl

Fri 8/7

1:30 pm-10:00 am

2 stops54h 30m

$6,977

Flights are sorted by cheapest round-trip flights first.

Deals found on 5/5

Sorted by cheapest first

Compare providers for flights from Seattle to Phnom Penh

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Seattle to Phnom Penh in May.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
AranGrantPrice Accuracy3 starsTrust Score*3 stars
OvagoPrice Accuracy3 starsTrust Score*3 stars
oojoPrice Accuracy3 starsTrust Score*2 stars
Justfly.comPrice Accuracy3 starsTrust Score*3 stars
CheapfaremartPrice Accuracy-Trust Score*1 star

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Seattle-Phnom Penh flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Seattle-Phnom Penh flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Seattle-Phnom Penh flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Seattle-Phnom Penh flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Seattle-Phnom Penh flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from Seattle to Phnom Penh

Have a flexible travel schedule? Discover the best time to fly to Phnom Penh from Seattle with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Seattle to Phnom Penh

How far ahead should I book a flight from Seattle to Phnom Penh?

The best time to book flights from Seattle to Phnom Penh is 89 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.

What is the cheapest month to book a flight from Seattle to Phnom Penh?

Currently, September is the cheapest month in which you can book a flight from Seattle to Phnom Penh (average of $813). Flying from Seattle to Phnom Penh in June is currently the most expensive (average of $1,498). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

How much does it cost to fly round-trip from Seattle to Phnom Penh?

Reviews of airlines servicing Phnom Penh

Get insights into the airlines that provide service to Phnom Penh. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Phnom Penh. Reviews last updated May 8, 2026.
Read reviews from past customers who have flown EVA Air,Korean Air, andChina Airlines from Seattle to Phnom Penh. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
EVA Air
8.5
Very good
1,445 reviews

Food

8.1

Entertainment

8.0

Crew

8.6

Overall

8.5

Boarding

8.4

Comfort

8.3

Reviews

1 / 20
8.0
Excellent

Jolene,Jan 2026

SGN - TPE

Everything was good. I asked for aisle seating as I must stretch my leg out because of back and pelvis issues. Sometimes I don't always get it. But I did for all 3 of my flights for my destination. It was very nice.
EVA Air
8.5
Very good
1,445 reviews
EVA Air
8.5
Very good
1,445 reviews

Food

8.1

Entertainment

8.0

Crew

8.6

Overall

8.5

Boarding

8.4

Comfort

8.3

Reviews

1 / 20
8.0
Excellent

Jolene,Jan 2026

SGN - TPE

Everything was good. I asked for aisle seating as I must stretch my leg out because of back and pelvis issues. Sometimes I don't always get it. But I did for all 3 of my flights for my destination. It was very nice.
Korean Air
8.4
Very good
1,217 reviews
EVA Air
8.5
Very good
1,445 reviews

Food

8.1

Entertainment

8.0

Crew

8.6

Overall

8.5

Boarding

8.4

Comfort

8.3

Reviews

1 / 20
8.0
Excellent

Jolene,Jan 2026

SGN - TPE

Everything was good. I asked for aisle seating as I must stretch my leg out because of back and pelvis issues. Sometimes I don't always get it. But I did for all 3 of my flights for my destination. It was very nice.
China Airlines
8.3
Very good
822 reviews
EVA Air
8.5
Very good
1,445 reviews

Food

8.1

Entertainment

8.0

Crew

8.6

Overall

8.5

Boarding

8.4

Comfort

8.3

Reviews

1 / 20
8.0
Excellent

Jolene,Jan 2026

SGN - TPE

Everything was good. I asked for aisle seating as I must stretch my leg out because of back and pelvis issues. Sometimes I don't always get it. But I did for all 3 of my flights for my destination. It was very nice.
Singapore Airlines
8.2
Very good
1,511 reviews
EVA Air
8.5
Very good
1,445 reviews

Food

8.1

Entertainment

8.0

Crew

8.6

Overall

8.5

Boarding

8.4

Comfort

8.3

Reviews

1 / 20
8.0
Excellent

Jolene,Jan 2026

SGN - TPE

Everything was good. I asked for aisle seating as I must stretch my leg out because of back and pelvis issues. Sometimes I don't always get it. But I did for all 3 of my flights for my destination. It was very nice.
Asiana Airlines
8.1
Very good
530 reviews
EVA Air
8.5
Very good
1,445 reviews

Food

8.1

Entertainment

8.0

Crew

8.6

Overall

8.5

Boarding

8.4

Comfort

8.3

Reviews

1 / 20
8.0
Excellent

Jolene,Jan 2026

SGN - TPE

Everything was good. I asked for aisle seating as I must stretch my leg out because of back and pelvis issues. Sometimes I don't always get it. But I did for all 3 of my flights for my destination. It was very nice.

Related info for your journey

Find useful and relevant information for your journey from Seattle to Phnom Penh. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • How long is the flight from Seattle to Phnom Penh?

    Airlines like British Airways fly from Seattle to Phnom Penh in about 54h 30m. The time it takes to get you to your destination can typically vary by up to . The distance from Seattle to Phnom Penh is about 7432 mi.

  • What are the cheapest airlines flying from Seattle to Phnom Penh round-trip?

    Our cheapest airline available from Seattle to Phnom Penh is Singapore Airlines. Our recent data shows that you can find tickets from as low as $702 on this airline. Additional options worth looking into are Asiana Airlines and Korean Air, starting at $773 and $787 round-trip. Singapore Airlines is 34% cheaper than the average price of flights available within the next 90 days to this destination.

  • What are the cheapest airlines to fly from Seattle to Phnom Penh one-way?

    For one-way options, check prices for Korean Air. According to our data, you can fly for as low as $397. Users have also found prices from $413 and $500 on Asiana Airlines and China Airlines, respectively.

  • Where are the most common layover locations when flying from Seattle to Phnom Penh?

    Seattle to Phnom Penh flights have a layover in Taipei City most of the time.

  • What are some popular things to do or see while on a layover in Taipei City?

    The majority of Taipei City visitors spend their time at Taipei 101, Raohe Street Night Market, and Shilin Night Market. Taipei 101, Raohe Street Night Market, and Shilin Night Market can be accessed by traveling approximately 21.0 mi, 21.6 mi, and 18.3 mi, respectively from Taipei City Taiwan Taoyuan Intl. Travelers in need of a car in Taipei City can rent one for about $78 per day.

  • Where are the least popular layover locations for Seattle to Phnom Penh flights?

    Flights departing from Seattle and landing in Phnom Penh layover in Seoul least frequently.

  • Can I find deals for flights from Seattle to Phnom Penh that include hotel bookings?

    Yes. In addition to deals on Seattle to Phnom Penh flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Seattle to Phnom Penh?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Seattle to Phnom Penh.

  • Can I find deals for business class flights from Seattle to Phnom Penh?

    Yes. Cheapflights offers flight deals from Seattle to Phnom Penh by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Seattle to Phnom Penh?

    Currently, September is the cheapest month in which you can book a flight from Seattle to Phnom Penh (average of $813). Flying from Seattle to Phnom Penh in June is currently the most expensive (average of $1,498). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

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Complete your trip

Complete your trip to Phnom Penh by adding a car rental and/or hotel reservation to your travel itinerary.
Phnom Penh car rentals
Phnom Penh Pochentong Airport car rentals

Top 5 airlines flying from Seattle to Phnom Penh

Discover the top 5 airlines that operate flights from Seattle to Phnom Penh. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated May 8, 2026.
AirlineCheapestAverageFlexibilityOn-time
Singapore AirlinesCheapest$702Average$814FlexibilityNo cancel feeOn-time81%
Asiana AirlinesCheapest$773Average$1,062FlexibilityNo cancel feeOn-time76%
Korean AirCheapest$787Average$1,029FlexibilityNo cancel feeOn-time81%
EVA AirCheapest$1,094Average$1,426FlexibilityNo cancel feeOn-time74%
China AirlinesCheapest$1,162Average$1,393FlexibilityNo cancel feeOn-time70%

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