$345 Cheap Flights from Portland (PDX) to Shannon (SNN)

View $345 flight on Tue, Oct 14, 2025Opens in a new window

Popular airlines from Portland International Airport (PDX) to Shannon Airport (SNN)

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Cheap Flights from Portland to Shannon (PDX-SNN)

Prices were available within the past 7 days and start at $345 for one-way flights and $487 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

United
Tue, Apr 28 - Tue, May 5
PDX
Portland
SNN
Shannon
$487 Roundtrip, found 2 days ago
$487
Roundtrip
found 2 days ago
Select United flight, departing Tue, Apr 28 from Portland to Shannon, returning Tue, May 5, priced at $487 found 2 days ago
United
Tue, Apr 28 - Tue, May 5
PDX
Portland
SNN
Shannon
$492 Roundtrip, found 2 days ago
$492
Roundtrip
found 2 days ago
Select United flight, departing Tue, Apr 28 from Portland to Shannon, returning Tue, May 5, priced at $492 found 2 days ago
Delta
Wed, Sep 3 - Thu, Sep 11
PDX
Portland
SNN
Shannon
$517 Roundtrip, found 19 hours ago
$517
Roundtrip
found 19 hours ago
Select Delta flight, departing Wed, Sep 3 from Portland to Shannon, returning Thu, Sep 11, priced at $517 found 19 hours ago
Delta
Fri, Sep 12 - Tue, Sep 16
PDX
Portland
SNN
Shannon
$517 Roundtrip, found 3 days ago
$517
Roundtrip
found 3 days ago
Select Delta flight, departing Fri, Sep 12 from Portland to Shannon, returning Tue, Sep 16, priced at $517 found 3 days ago
Delta
Mon, Sep 8 - Tue, Sep 16
PDX
Portland
SNN
Shannon
$521 Roundtrip, found 19 hours ago
$521
Roundtrip
found 19 hours ago
Select Delta flight, departing Mon, Sep 8 from Portland to Shannon, returning Tue, Sep 16, priced at $521 found 19 hours ago
United
Thu, Sep 11 - Thu, Sep 25
PDX
Portland
SNN
Shannon
$522 Roundtrip, found 14 hours ago
$522
Roundtrip
found 14 hours ago
Select United flight, departing Thu, Sep 11 from Portland to Shannon, returning Thu, Sep 25, priced at $522 found 14 hours ago
United
Thu, Sep 11 - Thu, Sep 25
PDX
Portland
SNN
Shannon
$523 Roundtrip, found 14 hours ago
$523
Roundtrip
found 14 hours ago
Select United flight, departing Thu, Sep 11 from Portland to Shannon, returning Thu, Sep 25, priced at $523 found 14 hours ago
Air Canada
Wed, Nov 19 - Wed, Dec 3
PDX
Portland
SNN
Shannon
$684 Roundtrip, found 11 hours ago
$684
Roundtrip
found 11 hours ago
Select Air Canada flight, departing Wed, Nov 19 from Portland to Shannon, returning Wed, Dec 3, priced at $684 found 11 hours ago
American Airlines
Wed, Dec 3 - Wed, Dec 10
PDX
Portland
SNN
Shannon
$685 Roundtrip, found 4 days ago
$685
Roundtrip
found 4 days ago
Select American Airlines flight, departing Wed, Dec 3 from Portland to Shannon, returning Wed, Dec 10, priced at $685 found 4 days ago
British Airways
Sun, Apr 5 - Sat, Apr 11
PDX
Portland
SNN
Shannon
$686 Roundtrip, found 13 hours ago
$686
Roundtrip
found 13 hours ago
Select British Airways flight, departing Sun, Apr 5 from Portland to Shannon, returning Sat, Apr 11, priced at $686 found 13 hours ago

Alternative airports near Shannon

Prices were available within the past 7 days. Prices and availability are subject to change.

Select flight to Shannon Airport SNN. Cheapest and Closest option available. Average driving time to city center is 7 minutes. Flights from $521
SNN
Shannon Airport
CheapestClosest
Average driving time to city center7 min
Flights from $521
Flights from Portland (PDX) to Shannon (SNN)
Origin airport
Portland Intl.
Destination airport
Shannon
Airlines serving
Aer Lingus, Air Canada, American Airlines, British Airways, Delta, JetBlue Airways, Lufthansa, United
Roundtrip price
$486
Distance
4598 mi

Portland to Shannon Flights

The cheapest times to fly from Portland to Shannon

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 Portland to Shannon are during the month of April. You can find some of the cheapest flights from Portland to Shannon with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Portland to Shannon

Sunday is one of the best days to book for cheap flights from Portland to Shannon: 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 Portland to Shannon

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 Portland to Shannon in 2025. You can also book with separate airlines for your outbound and return journeys, from $345 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 Portland to Shannon 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 Portland to Shannon 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 Portland Intl. Airport (PDX) to Shannon Airport (SNN) cost?
Snag a cheap one-way flight from $345 or cheap return flight from $487 from Portland Intl. Airport (PDX) to Shannon Airport (SNN) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to see our cheapest flight offers on this route.
What is the cheapest month to fly from Portland Intl. Airport (PDX) to Shannon Airport (SNN)?
April is the cheapest month to fly from PDX to SNN. Timing your trip outside of the busy season is often the key to better flight prices.
What is the cheapest airline that flies from Portland Intl. Airport (PDX) to Shannon Airport (SNN)?
Expedia's filter tool lets you easily compare travel time, airlines and fares all in one place. Customize the search to your preferences, then sort by "Price (lowest to highest)" to find the carrier with the cheapest PDX to SNN flight.
How many flights per day from Portland Intl. Airport (PDX) to Shannon Airport (SNN)?
There are no daily nonstop flights departing from Portland Intl. Airport (PDX) to Shannon Airport (SNN). But you can book flights with layovers. Filter your search results on Expedia to include one or more stops, and you'll be soaring above the clouds in no time.
What day of the week has the most flights from PDX to SNN?
You'll usually find Tuesday the quietest day for flights, while Fridays tend to be the busiest.* However this can vary from season to season and during public holidays or peak travel times.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Portland Intl. Airport (PDX) to Shannon Airport (SNN)?
To touch down at Shannon Airport (SNN) on schedule, opt for a flight that takes off from Portland Intl. Airport (PDX) before 3 PM. The chance of cancellations is 22% higher, on average, for departures after this hour.**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 Portland Intl. Airport (PDX) to Shannon Airport (SNN) last-minute?
Booking your ticket from PDX to SNN right before your trip is generally more expensive. But if there's some wiggle room with your travel dates and times, you could snag a cheap last-minute fare.
Is it cheaper to book a PDX to SNN flight and hotel package?
Booking a PDX to SNN flight and hotel package is typically cheaper than booking separately. With Expedia, you can enjoy the convenience of organizing your trip all in one place. Select from our wide range of hotels and then add activities, flights and car rentals to your booking. Bundle it all together, and you could save hundreds of dollars.
Can I cancel or change the date of my flight from Portland Intl. Airport (PDX) to Shannon Airport (SNN)?
In most instances, you can cancel or modify your PDX to SNN flight. However, additional fees may apply, especially if you booked more than 24 hours ago. Check your itinerary for the airline's fees and rules on flight changes, or if you need further information, go to our Customer Service portal.

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*Available to One Key members.