$1,007+ 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 11/23. Fares are subject to change and may not be available on all flights or dates of travel.
PWM — SNN
Nov 29 — Dec 61
Round-trip
1 adult, Economy
We work with more than 300 partners to bring you better travel deals
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 October 30, 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 October 30, 2026.
This Ovago deal was found by Cheapflights users on 10/25. 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 Ovago is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/2311:07 am -
2 stops24h 38m
Mon 11/308:05 pm -
2 stops26h 55m
Deal found 10/25![Multiple Airlines logo]()
$1,007
This Gurufare deal was found by Cheapflights users on 10/27. 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 Gurufare is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/1110:55 am -
2 stops19h 35m
Fri 12/182:00 pm -
2 stops25h 23m
Deal found 10/27![Multiple Airlines logo]()
$1,017
This Air Canada deal was found by Cheapflights users on 10/27. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/113:20 pm -
3 stops19h 25m
Fri 12/187:50 am -
3 stops30h 17m
Deal found 10/27![Air Canada logo]()
$2,054
This Air Canada deal was found by Cheapflights users on 10/25. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/2310:50 am -
3 stops19h 40m
Mon 11/307:50 am -
3 stops30h 13m
Deal found 10/25![Air Canada logo]()
$2,086
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 October 30, 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 October 30, 2026.
This Ovago deal was found by Cheapflights users on 10/25. 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 Ovago is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/2311:07 am -
2 stops24h 38m
Mon 11/308:05 pm -
2 stops26h 55m
Deal found 10/25![Multiple Airlines logo]()
$1,007
This Gurufare deal was found by Cheapflights users on 10/27. 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 Gurufare is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/1110:55 am -
2 stops19h 35m
Fri 12/182:00 pm -
2 stops25h 23m
Deal found 10/27![Multiple Airlines logo]()
$1,017
This Air Canada deal was found by Cheapflights users on 10/27. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/113:20 pm -
3 stops19h 25m
Fri 12/187:50 am -
3 stops30h 17m
Deal found 10/27![Air Canada logo]()
$2,054
This Air Canada deal was found by Cheapflights users on 10/25. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/2310:50 am -
3 stops19h 40m
Mon 11/307:50 am -
3 stops30h 13m
Deal found 10/25![Air Canada logo]()
$2,086
Last-minute flights from Portland to ShannonDiscover last-minute flight deals from Portland to Shannon. Data last updated October 30, 2026 and is based on user searches.
Discover last-minute flight deals from Portland to Shannon. Data last updated October 30, 2026 and is based on user searches.
This Ovago deal was found by Cheapflights users on 10/25. 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 Ovago is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/2311:07 am -
2 stops24h 38m
Mon 11/308:05 pm -
2 stops26h 55m
Deal found 10/25![Multiple Airlines logo]()
$1,007
This Air Canada deal was found by Cheapflights users on 10/25. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/2310:50 am -
3 stops19h 40m
Mon 11/307:50 am -
3 stops30h 13m
Deal found 10/25![Air Canada logo]()
$2,086
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 October 30, 2026.
Most accurate provider | Expedia 1 star |
|---|---|
Most trusted provider | Expedia 3 stars |
Round-trip from | $1,007 (Ovago) |
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 October 30, 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
Mon 11/23
11:07 am-4:45 pm
2 stops24h 38m
Shannon
Mon 11/30
8:05 pm-6:00 pm
2 stops26h 55m
$1,007
Quickest round-trip
PortlandShannon
PWM Portland - SNN Shannon
PWMSNN
Portland
Fri 12/11
10:55 am-11:30 am
2 stops19h 35m
Shannon
Fri 12/18
2:00 pm-10:23 am
2 stops25h 23m
$1,017
PortlandShannon
PWM Portland - SNN Shannon
PWMSNN
Portland
Fri 12/11
3:20 pm-3:45 pm
3 stops19h 25m
Shannon
Fri 12/18
7:50 am-9:07 am
3 stops30h 17m
$2,054
PortlandShannon
PWM Portland - SNN Shannon
PWMSNN
Portland
Mon 11/23
10:50 am-11:30 am
3 stops19h 40m
Shannon
Mon 11/30
7:50 am-9:03 am
3 stops30h 13m
$2,086
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 October 30, 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.
Crew
8.1
Boarding
7.7
Comfort
7.3
Overall
7.3
Entertainment
7.1
Food
6.7
Reviews
1 / 20
8.0
ExcellentAsha,Sep 2026
LGA - IAH
Crew
8.1
Boarding
7.7
Comfort
7.3
Overall
7.3
Entertainment
7.1
Food
6.7
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.
Browse thousands of different options on Cheapflights for your next trip
Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.
Alternative routes
Complete your trip
Flights by cabin class
Other flight options
Other flights from Portland
Popular flights
Shannon flight routes
Alternative routes for Portland to Shannon
See prices for flight routes from nearby airports that may be better suited for you.
Complete your trip
Complete your trip to Shannon by adding a car rental and/or hotel reservation to your travel itinerary.
Search flights from Portland to Shannon by cabin class
Find flights from Portland to Shannon, based on your preferred cabin class, be it economy, premium economy, business, or first class.
Portland and Shannon flights
Browse other Portland and Shannon flight options. Last updated on October 30, 2026.
Other flights from Portland
Browse through other flights departing from Portland. Flights are based on user searches made on Cheapflights and were last updated on October 30, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Other flights to Shannon
Explore flights to Shannon departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on October 30, 2026.
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 October 30, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$606 | Average$1,007 | FlexibilityNo cancel fee | On-time69% |