$738+ 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 10/13. Fares are subject to change and may not be available on all flights or dates of travel.
PWM — SNN
Oct 17 — Oct 241
Round-trip
1 adult, Economy
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Find cheap flights from Portland to Shannon with Cheapflights
1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”2. Select your favorite providers
We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.3. Compare prices and book
Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.Cheap flight deals from Portland to Shannon
Cheapest
Best
Last-minute
Cheapest flights from Portland to ShannonExplore 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 September 17, 2026.
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 September 17, 2026.
This United Airlines deal was found by Cheapflights users on 9/16. 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.
Tue 10/136:00 am -
1 stop23h 15m
Tue 10/2012:30 pm -
1 stop10h 42m
Deal found 9/16![United Airlines logo]()
$738
This United Airlines deal was found by Cheapflights users on 9/13. 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.
Thu 10/86:00 am -
1 stop23h 15m
Wed 10/1412:30 pm -
1 stop15h 58m
Deal found 9/13![United Airlines logo]()
$829
This United Airlines deal was found by Cheapflights users on 9/17. 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 10/16:00 am -
1 stop23h 15m
Sun 10/412:30 pm -
1 stop12h 52m
Deal found 9/17![United Airlines logo]()
$831
This United Airlines deal was found by Cheapflights users on 9/16. 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.
Fri 10/96:00 am -
1 stop23h 15m
Mon 10/1212:30 pm -
2 stops26h 32m
Deal found 9/16![United Airlines logo]()
$868
Best flights from Portland to ShannonDiscover carefully curated flight deals from Portland to Shannon that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 17, 2026.
Discover carefully curated flight deals from Portland to Shannon that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 17, 2026.
This United Airlines deal was found by Cheapflights users on 9/12. 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.
Thu 10/86:00 am -
1 stop23h 15m
Wed 10/1412:30 pm -
1 stop15h 58m
Deal found 9/12![United Airlines logo]()
$738
This United Airlines deal was found by Cheapflights users on 9/13. 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.
Tue 10/1310:43 am -
1 stop18h 32m
Tue 10/2012:30 pm -
1 stop25h 38m
Deal found 9/13![United Airlines logo]()
$738
This United Airlines deal was found by Cheapflights users on 9/17. 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 10/16:00 am -
1 stop23h 15m
Sun 10/412:30 pm -
1 stop12h 52m
Deal found 9/17![United Airlines logo]()
$831
Last-minute flights from Portland to ShannonDiscover last-minute flight deals from Portland to Shannon. Data last updated September 17, 2026 and is based on user searches.
Discover last-minute flight deals from Portland to Shannon. Data last updated September 17, 2026 and is based on user searches.
This United Airlines deal was found by Cheapflights users on 9/17. 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 10/16:00 am -
1 stop23h 15m
Sun 10/412:30 pm -
1 stop12h 52m
Deal found 9/17![United Airlines logo]()
$831
This United Airlines deal was found by Cheapflights users on 9/13. 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.
Thu 10/86:00 am -
1 stop23h 15m
Wed 10/1412:30 pm -
1 stop15h 58m
Deal found 9/13![United Airlines logo]()
$829
This United Airlines deal was found by Cheapflights users on 9/16. 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.
Fri 10/96:00 am -
1 stop23h 15m
Mon 10/1212:30 pm -
2 stops26h 32m
Deal found 9/16![United Airlines logo]()
$868
This United Airlines deal was found by Cheapflights users on 9/16. 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.
Tue 10/136:00 am -
1 stop23h 15m
Tue 10/2012:30 pm -
1 stop10h 42m
Deal found 9/16![United Airlines logo]()
$738
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 September 17, 2026.
Most accurate provider | Expedia 1 star |
|---|---|
Most trusted provider | Expedia 3 stars |
Round-trip from | $738 (United Airlines) |
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 7,457,451 searches. Data last updated September 17, 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
Cheapest round-trip
PortlandShannon
PWM Portland - SNN Shannon
PWMSNN
Portland
Thu 10/8
6:00 am-10:15 am
1 stop23h 15m
Shannon
Wed 10/14
12:30 pm-11:28 pm
1 stop15h 58m
$738
PortlandShannon
PWM Portland - SNN Shannon
PWMSNN
Portland
Tue 10/13
10:43 am-10:15 am
1 stop18h 32m
Shannon
Tue 10/20
12:30 pm-9:08 am
1 stop25h 38m
$738
Quickest round-trip
PortlandShannon
PWM Portland - SNN Shannon
PWMSNN
Portland
Thu 10/1
6:00 am-10:15 am
1 stop23h 15m
Shannon
Sun 10/4
12:30 pm-8:22 pm
1 stop12h 52m
$831
Sorted by cheapest first
- Most accurate provider: When it comes to deals on Portland, Maine-Shannon, Clare flights, users find the pricing of Expedia to be most consistent on Cheapflights vs. Expedia Users can find the same prices on Portland, Maine-Shannon, Clare flight deals on Cheapflights vs. Expedia <90% 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 Expedia the most. Expedia 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.
PWM-SNN
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.
Reviews of airlines servicing Shannon
Get insights into the airlines that provide service to Shannon. 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 Shannon. Reviews last updated September 17, 2026.
Peruse reviews from past customers who have flown with United Airlines from Portland to Shannon to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Food
6.7
Overall
7.4
Boarding
7.7
Comfort
7.3
Crew
8.1
Entertainment
7.1
Reviews
1 / 20
8.0
ExcellentAsha,Sep 2026
LGA - IAH
Food
6.7
Overall
7.4
Boarding
7.7
Comfort
7.3
Crew
8.1
Entertainment
7.1
Reviews
1 / 20
8.0
ExcellentAsha,Sep 2026
LGA - IAH
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.
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Alternative routes for Portland to Shannon
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Complete your trip
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Portland and Shannon flights
Browse other Portland and Shannon flight options. Last updated on September 17, 2026.
Other flights from Portland
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Other flights to Shannon
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Top airline flying from Portland to Shannon
Discover the top airline that operate flights from Portland to Shannon. 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 7,457,451 searches. Data last updated September 17, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$606 | Average$883 | FlexibilityNo cancel fee | On-time69% |