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Shannon

$596+ Cheap flights from Portland, ME (PWM) to Shannon (SNN)

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 4/4. Fares are subject to change and may not be available on all flights or dates of travel.
PWM — SNN
Apr 15 — Apr 221
Wed 4/15
Wed 4/22
1 adult, Economy
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Cheap flight deals from Portland to Shannon

Cheapest flights from Portland to Shannon
Explore the most affordable flight options available from Portland to Shannon. Find the lowest fares from popular airlines and budget airlines, with prices last updated on March 16, 2026.

This United Airlines deal was found by Cheapflights users on 3/13. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/47:36 pm
PWM
-
SNN
2 stops33h 39m
United Airlines
Wed 4/812:30 pm
SNN
-
PWM
1 stop15h 58m
United Airlines
Deal found 3/13$596
This United Airlines deal was found by Cheapflights users on 3/14. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/287:12 pm
PWM
-
SNN
1 stop10h 03m
United Airlines
Tue 5/512:30 pm
SNN
-
PWM
1 stop10h 53m
United Airlines
Deal found 3/14$608
This United Airlines deal was found by Cheapflights users on 3/12. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/259:15 am
PWM
-
SNN
1 stop17h 15m
United Airlines
Wed 8/269:30 am
SNN
-
PWM
1 stop17h 31m
United Airlines
Deal found 3/12$631
This United Airlines deal was found by Cheapflights users on 3/16. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/166:00 am
PWM
-
SNN
1 stop20h 30m
United Airlines
Tue 7/289:30 am
SNN
-
PWM
1 stop13h 14m
United Airlines
Deal found 3/16$669
This United Airlines deal was found by Cheapflights users on 3/12. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 7/198:15 pm
PWM
-
SNN
1 stop9h 00m
United Airlines
Wed 7/229:30 am
SNN
-
PWM
2 stops19h 21m
United Airlines
Deal found 3/12$674
This United Airlines deal was found by Cheapflights users on 3/15. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/292:12 pm
PWM
-
SNN
2 stops15h 03m
United Airlines
Wed 5/612:30 pm
SNN
-
PWM
1 stop10h 53m
United Airlines
Deal found 3/15$729

Find flight deals from Portland to Shannon

Discover tips and strategies to find the most affordable flight options for your journey from Portland (PWM) to Shannon (SNN). 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 March 16, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$596
(United Airlines)
Provider with most accurate pricing for Portland-Shannon flight deals.
Search Deals
Provider most trusted by Cheapflights users for Portland-Shannon flights.
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From Portland to Shannon
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Portland to Shannon 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 March 16, 2026.
Use the filters below to find and compare flights from Portland to Shannon that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

PortlandShannon

PWM - SNN

PWMSNN

Portland

Sat 4/4

6:00 am-10:15 am

2 stops23h 15m

Shannon

Wed 4/8

12:30 pm-10:22 am

2 stops26h 52m

$596

PortlandShannon

PWM - SNN

PWMSNN

Portland

Tue 4/28

7:12 pm-10:15 am

1 stop10h 03m

Shannon

Tue 5/5

12:30 pm-10:23 am

2 stops26h 53m

$612

PortlandShannon

PWM - SNN

PWMSNN

Portland

Tue 8/25

9:15 am-7:30 am

1 stop17h 15m

Shannon

Wed 8/26

9:30 am-10:01 pm

1 stop17h 31m

$631
Quickest round-trip

PortlandShannon

PWM - SNN

PWMSNN

Portland

Thu 7/16

6:00 am-7:30 am

1 stop20h 30m

Shannon

Tue 7/28

9:30 am-5:44 pm

1 stop13h 14m

$669

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/13

Sorted by cheapest first

Compare providers for flights from Portland to Shannon

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 Portland to Shannon in March.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars

*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 Portland, Maine-Shannon, Clare flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Portland, Maine-Shannon, Clare flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Portland, Maine-Shannon, Clare flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Portland, Maine-Shannon, Clare 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 Portland, Maine-Shannon, Clare 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 Portland to Shannon

Have a flexible travel schedule? Discover the best time to fly to Shannon from Portland 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 Portland to Shannon

What is the cheapest month to book a flight from Portland, Maine to Shannon, Clare?

Currently, November is the cheapest month in which you can book a flight from Portland, Maine to Shannon, Clare (average of $338). Flying from Portland, Maine to Shannon, Clare in June is currently the most expensive (average of $452). 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.

Related info for your journey

Find useful and relevant information for your journey from Portland to Shannon. 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 Portland, Maine to Shannon, Clare?

    United Airlines can get you from Portland, Maine to Shannon, Clare in just under 33h 39m. Your travel time can differ by up to . Airlines will cover a distance of 2805 mi.

  • Can I find deals for flights from Portland to Shannon that include hotel bookings?

    Yes. In addition to deals on Portland to Shannon flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Portland to Shannon?

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

  • Can I find deals for business class flights from Portland to Shannon?

    Yes. Cheapflights offers flight deals from Portland to Shannon 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 Portland, Maine to Shannon, Clare?

    Currently, November is the cheapest month in which you can book a flight from Portland, Maine to Shannon, Clare (average of $338). Flying from Portland, Maine to Shannon, Clare in June is currently the most expensive (average of $452). 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

Traveling to a place near Shannon?

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Ennis

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