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Cheap flights from Portland, Maine to Shannon from $554

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Portland, Maine to Shannon departing on 9/8. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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0 bags

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Find the cheapest flights from Portland, Maine to Shannon (PWM-SNN)

Cheap round-trip flights

American Airlines Logo
3:56 pm - 11:20 amPWM-SNN
14h 24m2 stops
American Airlines Logo
9:15 pm - 5:39 pmSNN-PWM
25h 24m2 stops
$708American Airlines
Find Deal
Mon, Sep 15 - Tue, Sep 23
United Airlines Logo
2:14 pm - 10:15 amPWM-SNN
15h 01m2 stops
United Airlines Logo
9:30 am - 9:59 pmSNN-PWM
17h 29m1 stop
$750United Airlines
Find Deal
Mon, Sep 15 - Tue, Sep 23
United Airlines Logo
6:14 am - 10:15 amPWM-SNN
23h 01m2 stops
United Airlines Logo
12:30 pm - 6:38 pmSNN-PWM
11h 08m1 stop
$756United Airlines
Find Deal
Sat, Oct 18 - Sat, Oct 25
American Airlines Logo
6:00 am - 4:45 pmPWM-SNN
29h 45m2 stops
American Airlines Logo
2:45 pm - 11:50 amSNN-PWM
26h 05m2 stops
$758American Airlines
Find Deal
Wed, Nov 12 - Sun, Nov 16
American Airlines Logo
12:33 pm - 4:45 pmPWM-SNN
23h 12m2 stops
American Airlines Logo
7:50 am - 10:54 pmSNN-PWM
20h 04m2 stops
$768American Airlines
Find Deal
Wed, Nov 12 - Sun, Nov 16
American Airlines Logo
3:52 pm - 11:30 amPWM-SNN
14h 38m2 stops
American Airlines Logo
2:00 pm - 11:59 pmSNN-PWM
14h 59m2 stops
$788American Airlines
Find Deal
Wed, Nov 12 - Sun, Nov 16
United Airlines Logo
6:14 am - 10:15 amPWM-SNN
23h 01m2 stops
United Airlines Logo
12:30 pm - 2:12 pmSNN-PWM
30h 42m2 stops
$822United Airlines
Find Deal
Sat, Oct 18 - Sat, Oct 25
Air Canada Logo
3:11 pm - 4:10 pmPWM-SNN
19h 59m3 stops
Air Canada Logo
7:40 am - 11:03 pmSNN-PWM
20h 23m3 stops
$1,115Air Canada
Find Deal
Mon, Sep 15 - Tue, Sep 23
American Airlines Logo
12:36 pm - 11:30 amPWM-SNN
17h 54m2 stops
American Airlines Logo
7:50 am - 10:48 pmSNN-PWM
19h 58m2 stops
$1,174American Airlines
Find Deal
Fri, Dec 26 - Fri, Jan 2
JetBlue Logo
7:09 am - 5:55 amPWM-SNN
17h 46m1 stop
JetBlue Logo
2:35 pm - 1:22 pmSNN-PWM
27h 47m1 stop
$1,451JetBlue
Find Deal
Mon, Sep 15 - Tue, Sep 23

American Airlines flights from Portland, Maine to Shannon, Clare

Our best American Airlines deals on Portland, Maine to Shannon, Clare flight tickets
American Airlines
Sep 15
PWM3:56 pmPortland
14h 24m
2 stops
SNN11:20 amShannon
Sep 23
SNN9:15 pmShannon
25h 24m
2 stops
PWM5:39 pmPortland
$708
Find similar
American Airlines
Nov 12
PWM6:00 amPortland
29h 45m
2 stops
SNN4:45 pmShannon
Nov 16
SNN2:45 pmShannon
26h 05m
2 stops
PWM11:50 amPortland
$758
Find similar
American Airlines
Nov 12
PWM12:33 pmPortland
23h 12m
2 stops
SNN4:45 pmShannon
Nov 16
SNN7:50 amShannon
20h 04m
2 stops
PWM10:54 pmPortland
$768
Find similar

United Airlines flights from Portland, Maine to Shannon, Clare

Our best United Airlines deals on Portland, Maine to Shannon, Clare flight tickets
United Airlines
Sep 15
PWM2:14 pmPortland
15h 01m
2 stops
SNN10:15 amShannon
Sep 23
SNN9:30 amShannon
17h 29m
1 stop
PWM9:59 pmPortland
$750
Find similar
United Airlines
Oct 18
PWM6:14 amPortland
23h 01m
2 stops
SNN10:15 amShannon
Oct 25
SNN12:30 pmShannon
11h 08m
1 stop
PWM6:38 pmPortland
$756
Find similar
United Airlines
Oct 18
PWM6:14 amPortland
23h 01m
2 stops
SNN10:15 amShannon
Oct 25
SNN12:30 pmShannon
30h 42m
2 stops
PWM2:12 pmPortland
$822
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from Portland, Maine to Shannon, Clare 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, momondo users made 832,500 searches. Data last updated September 3, 2025.
Use the filters below to find and compare flights from Portland, Maine to Shannon, Clare that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

PortlandShannon

PWM - SNN

PWMSNN

Portland

Mon 9/15

3:56 pm-11:20 am

2 stops14h 24m

Shannon

Tue 9/23

9:15 pm-5:39 pm

2 stops25h 24m

$708

PortlandShannon

PWM - SNN

PWMSNN

Portland

Mon 9/15

2:14 pm-10:15 am

2 stops15h 01m

Shannon

Tue 9/23

9:30 am-9:59 pm

1 stop17h 29m

$750

PortlandShannon

PWM - SNN

PWMSNN

Portland

Sat 10/18

6:14 am-10:15 am

2 stops23h 01m

Shannon

Sat 10/25

12:30 pm-6:38 pm

1 stop11h 08m

$756

PortlandShannon

PWM - SNN

PWMSNN

Portland

Wed 11/12

6:00 am-4:45 pm

2 stops29h 45m

Shannon

Sun 11/16

2:45 pm-11:50 am

2 stops26h 05m

$758

PortlandShannon

PWM - SNN

PWMSNN

Portland

Wed 11/12

12:33 pm-4:45 pm

2 stops23h 12m

Shannon

Sun 11/16

7:50 am-10:54 pm

2 stops20h 04m

$768

PortlandShannon

PWM - SNN

PWMSNN

Portland

Wed 11/12

3:52 pm-11:30 am

2 stops14h 38m

Shannon

Sun 11/16

2:00 pm-11:59 pm

2 stops14h 59m

$788

PortlandShannon

PWM - SNN

PWMSNN

Portland

Sat 10/18

6:14 am-10:15 am

2 stops23h 01m

Shannon

Sat 10/25

12:30 pm-2:12 pm

2 stops30h 42m

$822

PortlandShannon

PWM - SNN

PWMSNN

Portland

Mon 9/15

3:11 pm-4:10 pm

3 stops19h 59m

Shannon

Tue 9/23

7:40 am-11:03 pm

3 stops20h 23m

$1,115

PortlandShannon

PWM - SNN

PWMSNN

Portland

Fri 12/26

12:36 pm-11:30 am

2 stops17h 54m

Shannon

Fri 1/2

7:50 am-10:48 pm

2 stops19h 58m

$1,174

PortlandShannon

PWM - SNN

PWMSNN

Portland

Mon 9/15

7:09 am-5:55 am

1 stop17h 46m

Shannon

Tue 9/23

2:35 pm-1:22 pm

1 stop27h 47m

$1,451

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 15 resultsSorted by cheapest first
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See travel insights to Shannon from

How to get the cheapest flight ticket from Portland, Maine to Shannon, Clare

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest airline that flies from Portland to Shannon?

American Airlines, KLM, and JetBlue are the most popular carriers operating from Portland to Shannon

What airlines fly to Shannon, Clare?

Aer Lingus, American Airlines and JetBlue are the top three most popular airlines that fly to Shannon, Clare from Portland, Maine according to our data. Aer Lingus is the first choice among our users, with 80% of people opting to fly with this airline when traveling to Shannon, Clare. Keep in mind that there are 7 different airlines that fly to Shannon, Clare on a routine basis, so you have a few additional options to choose from.

When to book flights from Portland, Maine to Shannon, Clare

Are you open to changing your travel dates? Check out the ideal times to fly from Portland, Maine to Shannon, Clare according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap Portland, Maine to Shannon, Clare (PWM to SNN) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Portland, Maine to Shannon, Clare

Direct flights

None
There are no direct flights from Portland, Maine to Shannon, Clare. There are no popular flight routes from Portland, Maine to Shannon, Clare.
Search flight deals

  • How far is Portland to Shannon by plane?

    The straight-line distance from Portland to Shannon is 2804.2 mi. A reasonable flight in good conditions will take 12h 44m.

  • When did momondo last update prices for flights from Portland Airport to Shannon Airport?

    Prices for flights from Portland Airport to Shannon Airport refresh daily.

  • How old do you have to be to fly from Portland Airport to Shannon Airport?

    Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Portland Airport to Shannon Airport.

  • What documentation or ID do you need to fly to Shannon Airport?

    The travel and health documents you'll need for your trip to Shannon Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Shannon Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

Traveling to a place near Shannon?

Book flights to Shannon if you plan to visit one of these locations
Limerick
Ennis
Adare
Bunratty
Lahinch
Nenagh

Why use momondo?

Why should I use momondo to find a flight deal from Portland to Shannon?

We help find the flight that best suits your needs, momondo compares prices from hundreds of airlines and travel agents and helps you filter them to find the best flight from Portland to Shannon for you.

Can I find flights from Portland to Shannon with flexible booking policies on momondo?

Yes. momondo enables you to select and highlight flights to Shannon from Portland with this policy.

How can momondo help me find flights from Portland to Shannon?

momondo helps you find the best flight between Portland and Shannon by providing filters to narrow your choice of flights to those matching your criteria. You can select flights based on numerous factors such as price, departure and landing times, airport and airline.

I’m not ready to book a flight from Portland to Shannon right now. Can momondo alert me if prices change?

Price alerts on flights to Shannon from Portland are quick and easy to set up on momondo. Simply perform a search and select the price alert feature. It is as simple as that.

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