$417 Cheap Flights from Seattle (SEA) to Phnom Penh (PNH)

View $417 flight on Thu, Sep 11, 2025Opens in a new window

Popular airlines from Seattle-Tacoma International Airport (SEA) to Phnom Penh Intl. Airport (PNH)

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Cheap Flights from Seattle to Phnom Penh (SEA-PNH)

Prices were available within the past 7 days and start at $417 for one-way flights and $681 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Singapore Airlines
Fri, Feb 6 - Wed, Feb 18
SEA
Seattle
PNH
Phnom Penh
$681 Roundtrip, found 2 days ago
$681
Roundtrip
found 2 days ago
Select Singapore Airlines flight, departing Fri, Feb 6 from Seattle to Phnom Penh, returning Wed, Feb 18, priced at $681 found 2 days ago
Philippine Airlines
Wed, Sep 3 - Sun, Nov 2
SEA
Seattle
PNH
Phnom Penh
$703 Roundtrip, found 5 days ago
$703
Roundtrip
found 5 days ago
Select Philippine Airlines flight, departing Wed, Sep 3 from Seattle to Phnom Penh, returning Sun, Nov 2, priced at $703 found 5 days ago
Delta
Tue, Aug 19 - Tue, Sep 9
SEA
Seattle
PNH
Phnom Penh
$811 Roundtrip, found 10 hours ago
$811
Roundtrip
found 10 hours ago
Select Delta flight, departing Tue, Aug 19 from Seattle to Phnom Penh, returning Tue, Sep 9, priced at $811 found 10 hours ago
Korean Air
Wed, Oct 29 - Wed, Dec 3
SEA
Seattle
PNH
Phnom Penh
$815 Roundtrip, found 9 hours ago
$815
Roundtrip
found 9 hours ago
Select Korean Air flight, departing Wed, Oct 29 from Seattle to Phnom Penh, returning Wed, Dec 3, priced at $815 found 9 hours ago
Asiana Airlines
Sun, Oct 5 - Fri, Oct 31
SEA
Seattle
PNH
Phnom Penh
$845 Roundtrip, found 1 hour ago
$845
Roundtrip
found 1 hour ago
Select Asiana Airlines flight, departing Sun, Oct 5 from Seattle to Phnom Penh, returning Fri, Oct 31, priced at $845 found 1 hour ago
Cathay Pacific
Sun, Sep 28 - Sun, Oct 12
SEA
Seattle
PNH
Phnom Penh
$960 Roundtrip, found 1 day ago
$960
Roundtrip
found 1 day ago
Select Cathay Pacific flight, departing Sun, Sep 28 from Seattle to Phnom Penh, returning Sun, Oct 12, priced at $960 found 1 day ago
China Airlines
Tue, Sep 2 - Thu, Oct 2
SEA
Seattle
PNH
Phnom Penh
$971 Roundtrip, found 13 hours ago
$971
Roundtrip
found 13 hours ago
Select China Airlines flight, departing Tue, Sep 2 from Seattle to Phnom Penh, returning Thu, Oct 2, priced at $971 found 13 hours ago
China Eastern Airlines
Tue, Jul 29 - Sat, Aug 30
SEA
Seattle
PNH
Phnom Penh
$1,013 Roundtrip, found 3 hours ago
$1,013
Roundtrip
found 3 hours ago
Select China Eastern Airlines flight, departing Tue, Jul 29 from Seattle to Phnom Penh, returning Sat, Aug 30, priced at $1,013 found 3 hours ago
Alaska Airlines
Wed, Oct 15 - Wed, Nov 12
PAE
Seattle
PNH
Phnom Penh
$1,031 Roundtrip, found 2 days ago
$1,031
Roundtrip
found 2 days ago
Select Alaska Airlines flight, departing Wed, Oct 15 from Seattle to Phnom Penh, returning Wed, Nov 12, priced at $1,031 found 2 days ago
EVA Airways
Mon, Aug 18 - Tue, Sep 16
SEA
Seattle
PNH
Phnom Penh
$1,115 Roundtrip, found 2 days ago
$1,115
Roundtrip
found 2 days ago
Select EVA Airways flight, departing Mon, Aug 18 from Seattle to Phnom Penh, returning Tue, Sep 16, priced at $1,115 found 2 days ago

Find the cheapest month to fly from Seattle (SEA) to Phnom Penh (PNH)

October is typically the cheapest month to fly

From $749 - $1,199 per traveler.

Graph displaying average flight prices per month

Flights from Seattle (SEA) to Phnom Penh (PNH)
Origin airport
Seattle - Tacoma Intl.
Destination airport
Phnom Penh Intl.
Airlines serving
Air Canada, Asiana Airlines, British Airways, Cathay Pacific, China Airlines, China Eastern Airlines, Delta, EVA Airways, Emirates, Etihad Airways, Finnair, KLM, Korean Air, Lufthansa, Malaysia Airlines, Philippine Airlines, Singapore Airlines, Turkish Airlines, United
Roundtrip price
$681
Distance
7437 mi

Seattle to Phnom Penh Flights

The cheapest times to fly from Seattle to Phnom Penh

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from Seattle to Phnom Penh are during the month of February. You can find some of the cheapest flights from Seattle to Phnom Penh with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Seattle to Phnom Penh

Sunday is one of the best days to book for cheap flights from Seattle to Phnom Penh: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

 

How to find cheap round-trip tickets from Seattle to Phnom Penh

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from Seattle to Phnom Penh in 2025. You can also book with separate airlines for your outbound and return journeys, from $417 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

 

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap Seattle to Phnom Penh flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

 

You could also save big by booking one of Expedia's vacation packages. Bundling together your Seattle to Phnom Penh airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

 

*Terms apply.

 

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

 

Frequently asked questions

How much does a flight from Seattle - Tacoma Intl. Airport (SEA) to Phnom Penh Intl. Airport (PNH) cost?
Discover the latest flight deals from SEA to PNH by entering your preferred travel dates and searching on Expedia. Easily compare prices by departure date if you have flexibility with your schedule and use handy filters to explore prices for your preferred journey. As a member of One Key™, our free loyalty program, you can use Price Tracking to watch fares and receive notifications if prices go up or down.
What is the cheapest month to fly from SEA to PNH?
The cheapest flights from SEA to PNH are usually during off-peak season, when demand is lower. To save money, avoid flying during public holidays, school breaks and major local events.
What is the cheapest airline that flies from SEA to PNH?
Use the filter tool on Expedia to compare airlines and find the cheapest carrier that'll take you from SEA to PNH. Sort your results by "Price (lowest to highest)" to snap up a great deal.
How many flights per day from Seattle - Tacoma Intl. Airport (SEA) to Phnom Penh Intl. Airport (PNH)?
You'll need to book a flight with a layover when traveling from Seattle - Tacoma Intl. Airport (SEA) to Phnom Penh Intl. Airport (PNH). There are no daily direct flights on this route. However, simply filter your search to include one or more stops to discover the best option for your trip.
What day of the week has the most flights from SEA to PNH?
Typically you'll find the widest variety of flight choices on a Friday. Tuesdays are often the quietest.* But this can change based on the airline, time of year and other factors.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Seattle - Tacoma Intl. Airport (SEA) to Phnom Penh Intl. Airport (PNH)?
Book a flight from Seattle - Tacoma Intl. Airport (SEA) to Phnom Penh Intl. Airport (PNH) that takes off before 3 PM to reduce the risk of delays and cancellations. Departures after this time are on average 22% more likely to be canceled.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
Is it cheaper to buy a plane ticket from Seattle - Tacoma Intl. Airport (SEA) to Phnom Penh Intl. Airport (PNH) last-minute?
Booking your ticket from SEA to PNH right before your trip is usually more expensive. However, if there's some wiggle room with your departure dates and times, you could grab a cheap last-minute fare.
Is it cheaper to book a SEA to PNH flight and hotel package?
You can save money by securing a SEA to PNH flight and hotel package compared to booking separately. In fact, you could save hundreds of dollars by bundling with Expedia. And it's simple to manage everything in one convenient place. Once you've chosen your ideal accommodations and flights, consider other add-ons like car rentals, activities and tours.
Can I cancel or change the date of my flight from Seattle - Tacoma Intl. Airport (SEA) to Phnom Penh Intl. Airport (PNH)?
Typically, you can modify or cancel your SEA to PNH flight. However, additional charges may apply, especially if your booking was made more than 24 hours ago. Double-check your itinerary for the airline's guidelines and fees on flight changes, or if you'd like further details, head to our Customer Service portal.

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*Available to One Key members.