What is the cheapest airline that flies from Portland to Great Falls?

United Airlines is the most popular carrier operating from Portland to Great Falls

When did momondo last update prices for flights from Portland Airport to Great Falls Airport?

Prices for flights from Portland Airport to Great Falls Airport refresh daily.

How many operators does momondo search for flights from Portland Airport to Great Falls Airport?

As of September 2025, there are 2 operators available to choose from for flights from Portland Airport to Great Falls Airport.

How old do you have to be to fly from Portland Airport to Great Falls 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 Great Falls Airport.

What documentation or ID do you need to fly to Great Falls Airport?

The required travel and health documents for your Great Falls Airport trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Great Falls Airport. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

$379 Cheap Flights from Portland to Great Falls in 2025/26

1 adult

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Find the cheapest flights from Portland, Maine to Great Falls

Round-trip

One-way

Last minute

Cheap round-trip flights

6:00 am - 1:26 pmPWM-GTF

9h 26m2 stops

7:00 am - 9:44 pmGTF-PWM

12h 44m2 stops

$379United Airlines

Find Deal

sáb., oct. 4 - mar., oct. 7

6:14 am - 1:26 pmPWM-GTF

9h 12m2 stops

7:00 am - 9:44 pmGTF-PWM

12h 44m2 stops

$404United Airlines

Find Deal

sáb., oct. 4 - mar., oct. 7

3:39 pm - 9:11 pmPWM-GTF

7h 32m1 stop

7:00 am - 9:44 pmGTF-PWM

12h 44m2 stops

$483United Airlines

Find Deal

sáb., oct. 4 - mar., oct. 7

3:39 pm - 9:11 pmPWM-GTF

7h 32m1 stop

7:00 am - 9:44 pmGTF-PWM

12h 44m2 stops

$504United Airlines

Find Deal

sáb., oct. 4 - mar., oct. 7

3:39 pm - 9:11 pmPWM-GTF

7h 32m1 stop

7:00 am - 3:48 pmGTF-PWM

6h 48m1 stop

$667United Airlines

Find Deal

sáb., oct. 4 - mar., oct. 7

3:39 pm - 9:11 pmPWM-GTF

7h 32m1 stop

7:00 am - 3:48 pmGTF-PWM

6h 48m1 stop

$688United Airlines

Find Deal

sáb., oct. 4 - mar., oct. 7

3:39 pm - 9:11 pmPWM-GTF

7h 32m1 stop

7:00 am - 3:48 pmGTF-PWM

6h 48m1 stop

$717United Airlines

Find Deal

sáb., oct. 4 - mar., oct. 7

United Airlines flights from Portland, Maine to Great Falls

Our best United Airlines deals on Portland, Maine to Great Falls flight tickets

United Airlines

Oct 4

PWM6:00 amPortland

9h 26m

2 stops

GTF1:26 pmGreat Falls

Oct 7

GTF7:00 amGreat Falls

12h 44m

2 stops

PWM9:44 pmPortland

$379

Find similar

United Airlines

Oct 4

PWM6:14 amPortland

9h 12m

2 stops

GTF1:26 pmGreat Falls

Oct 7

GTF7:00 amGreat Falls

12h 44m

2 stops

PWM9:44 pmPortland

$404

Find similar

United Airlines

Oct 4

PWM3:39 pmPortland

7h 32m

1 stop

GTF9:11 pmGreat Falls

Oct 7

GTF7:00 amGreat Falls

12h 44m

2 stops

PWM9:44 pmPortland

$483

Find similar

momondo Fare Finder

Use the filters below to find and compare flights from Portland, Maine to Great Falls that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

PortlandGreat Falls

PWM - GTF

PWMGTF

Portland

sáb. 10/4

6:00 am-1:26 pm

2 stops9h 26m

Great Falls

mar. 10/7

7:00 am-9:44 pm

2 stops12h 44m

$379

PortlandGreat Falls

PWM - GTF

PWMGTF

Portland

sáb. 10/4

6:14 am-1:26 pm

2 stops9h 12m

Great Falls

mar. 10/7

7:00 am-9:44 pm

2 stops12h 44m

$404

PortlandGreat Falls

PWM - GTF

PWMGTF

Portland

sáb. 10/4

3:39 pm-9:11 pm

1 stop7h 32m

Great Falls

mar. 10/7

7:00 am-9:44 pm

2 stops12h 44m

$483

PortlandGreat Falls

PWM - GTF

PWMGTF

Portland

sáb. 10/4

3:39 pm-9:11 pm

1 stop7h 32m

Great Falls

mar. 10/7

7:00 am-9:44 pm

2 stops12h 44m

$504

PortlandGreat Falls

PWM - GTF

PWMGTF

Portland

sáb. 10/4

3:39 pm-9:11 pm

1 stop7h 32m

Great Falls

mar. 10/7

7:00 am-3:48 pm

1 stop6h 48m

$667

PortlandGreat Falls

PWM - GTF

PWMGTF

Portland

sáb. 10/4

3:39 pm-9:11 pm

1 stop7h 32m

Great Falls

mar. 10/7

7:00 am-3:48 pm

1 stop6h 48m

$688

PortlandGreat Falls

PWM - GTF

PWMGTF

Portland

sáb. 10/4

3:39 pm-9:11 pm

1 stop7h 32m

Great Falls

mar. 10/7

7:00 am-3:48 pm

1 stop6h 48m

$717

PortlandGreat Falls

PWM - GTF

PWMGTF

Portland

dom. 9/28

6:14 am-1:26 pm

2 stops33h 12m

$432

PortlandGreat Falls

PWM - GTF

PWMGTF

Portland

dom. 9/28

3:15 pm-4:05 pm

3 stops26h 50m

$504

PortlandGreat Falls

PWM - GTF

PWMGTF

Portland

dom. 9/28

3:39 pm-9:11 pm

1 stop7h 32m

$724

Flights are sorted by cheapest round-trip flights first.

Sorted by cheapest first

How to get the cheapest flight ticket from Portland, Maine to Great Falls

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

Prices

Airlines

What is the cheapest time of day to depart on your flight to Great Falls?

According to our data, the cheapest time of day to fly to Great Falls is in the morning. momondo users have found flights departing from Portland, Maine to Great Falls in the morning for as low as $563. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. If you have a flexible travel schedule, then try to avoid flying in the afternoon when prices are $802 on average. Flights to Great Falls from Portland, Maine in the afternoon are generally more expensive because this time of day is more convenient for travelers’ schedules.

When to book flights from Portland, Maine to Great Falls

Are you open to changing your travel dates? Check out the ideal times to fly from Portland, Maine to Great Falls according to our flight data. Find out which month and days have the cheapest flights.

Estimated round-trip price

Cheap Portland, Maine to Great Falls (PWM to GTF) flight deals and tips

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

Direct flights	None

There are no direct flights from Portland, Maine to Great Falls. There are no popular flight routes from Portland, Maine to Great Falls.

Search flight deals

How far is Portland to Great Falls by plane?
The straight-line distance from Portland to Great Falls is 1977.7 mi. In terms of flight time, this usually takes a little over 7h 32m.
When did momondo last update prices for flights from Portland Airport to Great Falls Airport?
Prices for flights from Portland Airport to Great Falls Airport refresh daily.
How many operators does momondo search for flights from Portland Airport to Great Falls Airport?
As of September 2025, there are 2 operators available to choose from for flights from Portland Airport to Great Falls Airport.
How old do you have to be to fly from Portland Airport to Great Falls 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 Great Falls Airport.
What documentation or ID do you need to fly to Great Falls Airport?
The required travel and health documents for your Great Falls Airport trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Great Falls Airport. We recommend that you seek guidance from your airline or a reliable third party such as IATA.
What is the most popular airline from Portland, Maine to Great Falls?
Based on momondo bookings for flights between Portland, Maine and Great Falls, the leading airline is United Airlines, making up 52% of the total bookings. Other popular airlines include Delta with 48%.

Best airlines flying from Portland, Maine to Great Falls

Compare and see reviews for airlines that fly from Portland, Maine to Great Falls with momondo

Airline	Rating	Free Cancellation	Price
United Airlines	PriceFrom $340	Free Cancellation	Rating 7.4 8,924 reviews		Search United Airlines flights
Delta	PriceFrom $347	Free Cancellation	Rating 7.9 7,957 reviews		Search Delta flights

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

momondo compares prices from hundreds of airlines and agents so you can find and book the best deal on flights from Portland to Great Falls. Millions of users trust and use momondo every year so you are in good hands.

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

All flight searches from Portland to Great Falls on momondo can be filtered to show those which offer flexible booking policies.

How can momondo help me find flights from Portland to Great Falls?

momondo offers useful filters to help you find the right flight. Choose specific flight times, airports or even what payment method you prefer. We have numerous options to help you book your ideal flight from Portland to Great Falls.

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

If you are not ready to book a flight from Portland to Great Falls now, use our insights above to find helpful tips or alternatively set up a price alert, where momondo will track prices on flights to Great Falls and let you know when they change.