What is the cheapest airline that flies from Portland to San Antonio?

United Airlines and Delta are the most popular carriers operating from Portland to San Antonio

What airlines fly to San Antonio?

Delta, JetBlue and Southwest are the top three most popular airlines that fly to San Antonio from Portland, Maine according to our data. Delta is the first choice among our users, with 55% of people opting to fly with this airline when traveling to San Antonio. Keep in mind that there are 7 different airlines that fly to San Antonio on a routine basis, so you have a few additional options to choose from.

When did momondo last update prices for flights from Portland Airport to San Antonio Airport?

Prices for flights from Portland Airport to San Antonio Airport refresh daily.

How many operators does momondo search for flights from Portland Airport to San Antonio Airport?

There are 4 operators available for flights from Portland Airport to San Antonio Airport as of October 2025.

How old do you have to be to fly from Portland Airport to San Antonio 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 San Antonio Airport.

What documentation or ID do you need to fly to San Antonio Airport?

The travel and health documents you'll need for your trip to San Antonio 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 San Antonio Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

$258 Cheap Flights from Portland to San Antonio in 2025/26

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Find the cheapest flights from Portland, Maine to San Antonio

Round-trip

One-way

Last minute

Cheap round-trip flights

Enter your travel dates to find the best prices.

9:46 am - 10:03 amPWM-SAT

25h 17m1 stop

10:58 am - 10:36 amSAT-PWM

22h 38m1 stop

$314Multiple Airlines

Find Deal

vie., nov. 14 - mar., nov. 18

6:00 am - 3:46 pmPWM-SAT

10h 46m2 stops

2:10 pm - 9:14 pmSAT-PWM

6h 04m1 stop

$321United Airlines

Find Deal

sáb., feb. 7 - sáb., feb. 14

6:00 am - 3:46 pmPWM-SAT

10h 46m2 stops

2:24 pm - 11:20 pmSAT-PWM

7h 56m2 stops

$326United Airlines

Find Deal

sáb., feb. 7 - sáb., feb. 14

3:15 pm - 5:27 pmPWM-SAT

27h 12m2 stops

7:11 pm - 10:36 amSAT-PWM

14h 25m1 stop

$327Multiple Airlines

Find Deal

dom., nov. 23 - mar., nov. 25

5:10 am - 5:50 pmPWM-SAT

13h 40m1 stop

5:30 am - 1:25 pmSAT-PWM

6h 55m1 stop

$353Southwest

Find Deal

sáb., feb. 7 - sáb., feb. 14

5:21 pm - 11:05 pmPWM-SAT

6h 44m1 stop

6:48 am - 4:28 pmSAT-PWM

8h 40m1 stop

$365American Airlines

Find Deal

mar., dic. 2 - jue., dic. 4

4:50 pm - 10:19 pmPWM-SAT

6h 29m1 stop

6:45 am - 3:56 pmSAT-PWM

8h 11m2 stops

$392Delta

Find Deal

mar., mar. 10 - mié., mar. 11

12:50 pm - 10:32 pmPWM-SAT

10h 42m2 stops

5:30 am - 3:56 pmSAT-PWM

9h 26m2 stops

$397Delta

Find Deal

mar., mar. 10 - mié., mar. 11

2:50 pm - 11:00 pmPWM-SAT

9h 10m1 stop

5:15 am - 4:45 pmSAT-PWM

10h 30m1 stop

$472Southwest

Find Deal

jue., mar. 19 - dom., mar. 22

5:43 am - 11:05 pmPWM-SAT

18h 22m1 stop

6:50 am - 9:47 pmSAT-PWM

13h 57m1 stop

$602American Airlines

Find Deal

mar., nov. 11 - sáb., nov. 15

United Airlines flights from Portland, Maine to San Antonio

Our best United Airlines deals on Portland, Maine to San Antonio flight tickets

United Airlines

Feb 7

PWM6:00 amPortland

10h 46m

2 stops

SAT3:46 pmSan Antonio

Feb 14

SAT2:10 pmSan Antonio

6h 04m

1 stop

PWM9:14 pmPortland

$321

Find similar

United Airlines

Feb 7

PWM6:00 amPortland

10h 46m

2 stops

SAT3:46 pmSan Antonio

Feb 14

SAT2:24 pmSan Antonio

7h 56m

2 stops

PWM11:20 pmPortland

$326

Find similar

United Airlines

Dec 2

PWM4:25 pmPortland

7h 35m

1 stop

SAT11:00 pmSan Antonio

Dec 4

SAT11:47 amSan Antonio

10h 22m

2 stops

PWM11:09 pmPortland

$371

Find similar

Southwest flights from Portland, Maine to San Antonio

Our best Southwest deals on Portland, Maine to San Antonio flight tickets

Southwest

Feb 7

PWM5:10 amPortland

13h 40m

1 stop

SAT5:50 pmSan Antonio

Feb 14

SAT5:30 amSan Antonio

6h 55m

1 stop

PWM1:25 pmPortland

$353

Find similar

Southwest

Mar 19

PWM2:50 pmPortland

9h 10m

1 stop

SAT11:00 pmSan Antonio

Mar 22

SAT5:15 amSan Antonio

10h 30m

1 stop

PWM4:45 pmPortland

$472

Find similar

Southwest

Dec 2

PWM12:45 pmPortland

8h 20m

2 stops

SAT8:05 pmSan Antonio

Dec 4

SAT11:55 amSan Antonio

9h 20m

2 stops

PWM10:15 pmPortland

$476

Find similar

momondo Fare Finder

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

Fly from

Fly to

Route

Depart

Return

Price

PortlandSan Antonio

PWM - SAT

PWMSAT

Portland

vie. 11/14

9:46 am-10:03 am

1 stop25h 17m

San Antonio

mar. 11/18

10:58 am-10:36 am

1 stop22h 38m

$314

PortlandSan Antonio

PWM - SAT

PWMSAT

Portland

sáb. 2/7

6:00 am-3:46 pm

2 stops10h 46m

San Antonio

sáb. 2/14

2:10 pm-9:14 pm

1 stop6h 04m

$321

PortlandSan Antonio

PWM - SAT

PWMSAT

Portland

sáb. 2/7

6:00 am-3:46 pm

2 stops10h 46m

San Antonio

sáb. 2/14

2:24 pm-11:20 pm

2 stops7h 56m

$326

PortlandSan Antonio

PWM - SAT

PWMSAT

Portland

dom. 11/23

3:15 pm-5:27 pm

2 stops27h 12m

San Antonio

mar. 11/25

7:11 pm-10:36 am

1 stop14h 25m

$327

PortlandSan Antonio

PWM - SAT

PWMSAT

Portland

sáb. 2/7

5:10 am-5:50 pm

1 stop13h 40m

San Antonio

sáb. 2/14

5:30 am-1:25 pm

1 stop6h 55m

$353

PortlandSan Antonio

PWM - SAT

PWMSAT

Portland

mar. 12/2

5:21 pm-11:05 pm

1 stop6h 44m

San Antonio

jue. 12/4

6:48 am-4:28 pm

1 stop8h 40m

$365

PortlandSan Antonio

PWM - SAT

PWMSAT

Portland

mar. 3/10

4:50 pm-10:19 pm

1 stop6h 29m

San Antonio

mié. 3/11

6:45 am-3:56 pm

2 stops8h 11m

$392

PortlandSan Antonio

PWM - SAT

PWMSAT

Portland

mar. 3/10

12:50 pm-10:32 pm

2 stops10h 42m

San Antonio

mié. 3/11

5:30 am-3:56 pm

2 stops9h 26m

$397

PortlandSan Antonio

PWM - SAT

PWMSAT

Portland

jue. 3/19

2:50 pm-11:00 pm

1 stop9h 10m

San Antonio

dom. 3/22

5:15 am-4:45 pm

1 stop10h 30m

$472

PortlandSan Antonio

PWM - SAT

PWMSAT

Portland

mar. 11/11

5:43 am-11:05 pm

1 stop18h 22m

San Antonio

sáb. 11/15

6:50 am-9:47 pm

1 stop13h 57m

$602

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 18 resultsSorted by cheapest first

How to get the cheapest flight ticket from Portland, Maine to San Antonio

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 month to fly to San Antonio?

If you aren’t able to travel during the month of July, then book flights to San Antonio from Portland, Maine during October instead. Flights to San Antonio in October, while not as cheap as those in July, still average around $411.

What is the cheapest day to depart on your flight to San Antonio?

The cheapest day to depart on your flight to San Antonio is on a Wednesday when prices can be found for as low as $426. This is often the case because there is less demand to fly during this day of the week. Be sure to avoid booking your departure on a Sunday as prices are generally higher than usual. According to our data, the average ticket price to San Antonio on Sunday is $666.

What is the cheapest time of day to depart on your flight to San Antonio?

According to our data, the cheapest time of day to fly to San Antonio is in the afternoon. momondo users have found flights departing from Portland, Maine to San Antonio in the afternoon for as low as $446. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. Flights to San Antonio are more costly at noon, with an average ticket price of $611. Departure times at noon fall within the peak daily travel times, which is why tickets can be more expensive.

How far in advance should I book a flight to San Antonio?

You are more likely to see cheaper flights to San Antonio from Portland, Maine when booking weeks ahead of your departure date. In general, you can expect to find flights to San Antonio for around $518 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to San Antonio from Portland, Maine for as low as $385 on momondo.

How have Portland, Maine to San Antonio flight prices changed over time?

When to book flights from Portland, Maine to San Antonio

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

Estimated round-trip price

Cheap Portland, Maine to San Antonio (PWM to SAT) flight deals and tips

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

Direct flights	None

There are no direct flights from Portland, Maine to San Antonio. There are no popular flight routes from Portland, Maine to San Antonio.

Search flight deals

How far is Portland to San Antonio by plane?
The distance between Portland and San Antonio is about 1835.4 mi. In terms of flight time, this usually takes a little over 6h 29m.
When did momondo last update prices for flights from Portland Airport to San Antonio Airport?
Prices for flights from Portland Airport to San Antonio Airport refresh daily.
How many operators does momondo search for flights from Portland Airport to San Antonio Airport?
There are 4 operators available for flights from Portland Airport to San Antonio Airport as of October 2025.
How old do you have to be to fly from Portland Airport to San Antonio 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 San Antonio Airport.
What documentation or ID do you need to fly to San Antonio Airport?
The travel and health documents you'll need for your trip to San Antonio 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 San Antonio Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.
What is the most popular airline from Portland, Maine to San Antonio?
momondo data reveals that the most frequently booked airline on the route from Portland, Maine to San Antonio is Southwest, representing 32% of all bookings. The subsequent popular airlines are American Airlines at 30%, Delta at 23%, and United Airlines at 15%.

Best airlines flying from Portland, Maine to San Antonio

Compare and see reviews for airlines that fly from Portland, Maine to San Antonio with momondo

Airline	Rating	Free Cancellation	Price
United Airlines	PriceFrom $223	Free Cancellation	Rating 7.4 8,998 reviews	Search United Airlines flights
American Airlines	PriceFrom $234	Free Cancellation	Rating 7.2 11,035 reviews	Search American Airlines flights
Delta	PriceFrom $238	Free Cancellation	Rating 7.9 7,998 reviews	Search Delta flights
Southwest	PriceFrom $392	Free Cancellation	Rating 8.0 4,243 reviews	Search Southwest flights

New Braunfels

Boerne

Kerrville

Schertz

Pleasanton

Why use momondo?

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

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

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

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

How can momondo help me find flights from Portland to San Antonio?

momondo provides multiple filters to help you find the best flight to San Antonio from Portland. Filter by price, airline, airports, cabin, aircraft, payment method, number of stops and more.

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

Yes momondo offers price alerts on flights to San Antonio from Portland. After performing a search on this page you should be able to see the price alert set up feature. Simply provide a valid email address and momondo will instantly alert you when prices change.