What is the cheapest airline that flies from Seattle/Tacoma Intl to Harlingen Valley Intl?

Southwest and United Airlines are the most popular carriers operating from Seattle/Tacoma Intl to Harlingen Valley Intl

What airlines fly to Harlingen?

American Airlines, United Airlines and Delta are the top three most popular airlines that fly to Harlingen from Seattle according to our data. American Airlines is the first choice among our users, with 71% of people opting to fly with this airline when traveling to Harlingen. Keep in mind that there are 3 different airlines that fly to Harlingen on a routine basis, so you have a few additional options to choose from.

When did momondo last update prices for flights from Seattle/Tacoma Intl Airport to Harlingen Valley Intl Airport?

Prices for flights from Seattle/Tacoma Intl Airport to Harlingen Valley Intl Airport are refreshed on a daily basis.

How many operators does momondo search for flights from Seattle/Tacoma Intl Airport to Harlingen Valley Intl Airport?

There is 1 operator available for flights from Seattle/Tacoma Intl Airport to Harlingen Valley Intl Airport as of September 2026.

How old do you have to be to fly from Seattle/Tacoma Intl Airport to Harlingen Valley Intl Airport?

The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Seattle/Tacoma Intl Airport to Harlingen Valley Intl Airport.

What documentation or ID do you need to fly to Harlingen Valley Intl Airport?

The travel and health documents required for your trip to Harlingen Valley Intl Airport can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Harlingen Valley Intl Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

$205 Cheap Flights from Seattle to Harlingen in 2026/27

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from Seattle to Harlingen

Round-trip

One-way

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Cheap round-trip flights

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7:05 am - 4:01 pmSEA Seattle/Tacoma Intl-HRL Harlingen Valley Intl

6h 56m1 stop Houston George Bush Intcntl

5:25 pm - 10:51 pmHRL Harlingen Valley Intl-SEA Seattle/Tacoma Intl

7h 26m1 stop Houston George Bush Intcntl

$437United Airlines

Tue, Nov 10 - Wed, Nov 11

2:00 pm - 10:48 pmSEA Seattle/Tacoma Intl-HRL Harlingen Valley Intl

6h 48m1 stop Houston George Bush Intcntl

5:25 pm - 10:51 pmHRL Harlingen Valley Intl-SEA Seattle/Tacoma Intl

7h 26m1 stop Houston George Bush Intcntl

$437United Airlines

Tue, Nov 10 - Wed, Nov 11

7:05 am - 4:01 pmSEA Seattle/Tacoma Intl-HRL Harlingen Valley Intl

6h 56m1 stop Houston George Bush Intcntl

5:05 am - 6:33 pmHRL Harlingen Valley Intl-SEA Seattle/Tacoma Intl

15h 28m2 stops Houston George Bush Intcntl San Francisco

$442United Airlines

Tue, Nov 10 - Wed, Nov 11

6:00 am - 7:47 pmSEA Seattle/Tacoma Intl-HRL Harlingen Valley Intl

11h 47m2 stops Los Angeles Houston George Bush Intcntl

5:25 pm - 10:51 pmHRL Harlingen Valley Intl-SEA Seattle/Tacoma Intl

7h 26m1 stop Houston George Bush Intcntl

$442United Airlines

Tue, Nov 10 - Wed, Nov 11

11:45 pm - 10:08 amSEA Seattle/Tacoma Intl-HRL Harlingen Valley Intl

8h 23m1 stop Dallas/Fort Worth

2:46 pm - 7:44 pmHRL Harlingen Valley Intl-SEA Seattle/Tacoma Intl

6h 58m1 stop Dallas/Fort Worth

$449American Airlines

Tue, Oct 6 - Sat, Oct 10

5:00 am - 2:16 pmSEA Seattle/Tacoma Intl-HRL Harlingen Valley Intl

7h 16m1 stop Dallas/Fort Worth

5:50 am - 11:14 amHRL Harlingen Valley Intl-SEA Seattle/Tacoma Intl

7h 24m1 stop Dallas/Fort Worth

$454American Airlines

Tue, Oct 13 - Tue, Oct 20

5:00 am - 2:16 pmSEA Seattle/Tacoma Intl-HRL Harlingen Valley Intl

7h 16m1 stop Dallas/Fort Worth

5:50 am - 11:14 amHRL Harlingen Valley Intl-SEA Seattle/Tacoma Intl

7h 24m1 stop Dallas/Fort Worth

$454American Airlines

Tue, Oct 13 - Tue, Oct 20

2:07 pm - 11:31 pmSEA Seattle/Tacoma Intl-HRL Harlingen Valley Intl

7h 24m1 stop Dallas/Fort Worth

5:44 am - 1:13 pmHRL Harlingen Valley Intl-SEA Seattle/Tacoma Intl

9h 29m1 stop Dallas/Fort Worth

$458American Airlines

Tue, Dec 15 - Thu, Dec 31

2:07 pm - 11:31 pmSEA Seattle/Tacoma Intl-HRL Harlingen Valley Intl

7h 24m1 stop Dallas/Fort Worth

5:44 am - 1:13 pmHRL Harlingen Valley Intl-SEA Seattle/Tacoma Intl

9h 29m1 stop Dallas/Fort Worth

$488American Airlines

Tue, Dec 15 - Fri, Jan 1

5:10 am - 1:56 pmSEA Seattle/Tacoma Intl-HRL Harlingen Valley Intl

6h 46m1 stop Dallas/Fort Worth

5:44 am - 11:00 amHRL Harlingen Valley Intl-SEA Seattle/Tacoma Intl

7h 16m1 stop Dallas/Fort Worth

$509American Airlines

Mon, Dec 14 - Thu, Dec 31

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American Airlines flights from Seattle to Harlingen

Our best American Airlines deals on Seattle to Harlingen flight tickets

American Airlines

Oct 6

SEA11:45 pmSeattle/Tacoma Intl

8h 23m

1 stop

HRL10:08 amHarlingen Valley Intl

Oct 10

HRL2:46 pmHarlingen Valley Intl

6h 58m

1 stop

SEA7:44 pmSeattle/Tacoma Intl

$449

American Airlines

Oct 13

SEA5:00 amSeattle/Tacoma Intl

7h 16m

1 stop

HRL2:16 pmHarlingen Valley Intl

Oct 20

HRL5:50 amHarlingen Valley Intl

7h 24m

1 stop

SEA11:14 amSeattle/Tacoma Intl

$454

American Airlines

Dec 15

SEA2:07 pmSeattle/Tacoma Intl

7h 24m

1 stop

HRL11:31 pmHarlingen Valley Intl

Dec 31

HRL5:44 amHarlingen Valley Intl

9h 29m

1 stop

SEA1:13 pmSeattle/Tacoma Intl

$458

Southwest flights from Seattle to Harlingen

Our best Southwest deals on Seattle to Harlingen flight tickets

Southwest

Oct 6

SEA9:00 amSeattle/Tacoma Intl

10h 00m

2 stops

HRL9:00 pmHarlingen Valley Intl

Oct 10

HRL12:40 pmHarlingen Valley Intl

11h 05m

2 stops

SEA9:45 pmSeattle/Tacoma Intl

$500

Southwest

Oct 6

SEA8:55 amSeattle/Tacoma Intl

10h 05m

1 stop

HRL9:00 pmHarlingen Valley Intl

Oct 10

HRL12:40 pmHarlingen Valley Intl

11h 05m

2 stops

SEA9:45 pmSeattle/Tacoma Intl

$501

Southwest

Oct 13

SEA9:00 amSeattle/Tacoma Intl

10h 00m

2 stops

HRL9:00 pmHarlingen Valley Intl

Oct 20

HRL4:35 pmHarlingen Valley Intl

9h 20m

2 stops

SEA11:55 pmSeattle/Tacoma Intl

$541

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

SeattleHarlingen

SEA Seattle/Tacoma Intl - HRL Harlingen Valley Intl

SEAHRL

Seattle/Tacoma Intl

Tue 11/10

7:05 am-4:01 pm

1 stop6h 56m

Harlingen Valley Intl

Wed 11/11

5:25 pm-10:51 pm

1 stop7h 26m

$437

SeattleHarlingen

SEA Seattle/Tacoma Intl - HRL Harlingen Valley Intl

SEAHRL

Seattle/Tacoma Intl

Tue 11/10

2:00 pm-10:48 pm

1 stop6h 48m

Harlingen Valley Intl

Wed 11/11

5:25 pm-10:51 pm

1 stop7h 26m

$437

SeattleHarlingen

SEA Seattle/Tacoma Intl - HRL Harlingen Valley Intl

SEAHRL

Seattle/Tacoma Intl

Tue 11/10

7:05 am-4:01 pm

1 stop6h 56m

Harlingen Valley Intl

Wed 11/11

5:05 am-6:33 pm

2 stops15h 28m

$442

SeattleHarlingen

SEA Seattle/Tacoma Intl - HRL Harlingen Valley Intl

SEAHRL

Seattle/Tacoma Intl

Tue 11/10

6:00 am-7:47 pm

2 stops11h 47m

Harlingen Valley Intl

Wed 11/11

5:25 pm-10:51 pm

1 stop7h 26m

$442

SeattleHarlingen

SEA Seattle/Tacoma Intl - HRL Harlingen Valley Intl

SEAHRL

Seattle/Tacoma Intl

Tue 10/6

11:45 pm-10:08 am

1 stop8h 23m

Harlingen Valley Intl

Sat 10/10

2:46 pm-7:44 pm

1 stop6h 58m

$449

SeattleHarlingen

SEA Seattle/Tacoma Intl - HRL Harlingen Valley Intl

SEAHRL

Seattle/Tacoma Intl

Tue 10/13

5:00 am-2:16 pm

1 stop7h 16m

Harlingen Valley Intl

Tue 10/20

5:50 am-11:14 am

1 stop7h 24m

$454

SeattleHarlingen

SEA Seattle/Tacoma Intl - HRL Harlingen Valley Intl

SEAHRL

Seattle/Tacoma Intl

Tue 10/13

5:00 am-2:16 pm

1 stop7h 16m

Harlingen Valley Intl

Tue 10/20

5:50 am-11:14 am

1 stop7h 24m

$454

SeattleHarlingen

SEA Seattle/Tacoma Intl - HRL Harlingen Valley Intl

SEAHRL

Seattle/Tacoma Intl

Tue 12/15

2:07 pm-11:31 pm

1 stop7h 24m

Harlingen Valley Intl

Thu 12/31

5:44 am-1:13 pm

1 stop9h 29m

$458

SeattleHarlingen

SEA Seattle/Tacoma Intl - HRL Harlingen Valley Intl

SEAHRL

Seattle/Tacoma Intl

Tue 12/15

2:07 pm-11:31 pm

1 stop7h 24m

Harlingen Valley Intl

Fri 1/1

5:44 am-1:13 pm

1 stop9h 29m

$488

Quickest round-trip

SeattleHarlingen

SEA Seattle/Tacoma Intl - HRL Harlingen Valley Intl

SEAHRL

Seattle/Tacoma Intl

Mon 12/14

5:10 am-1:56 pm

1 stop6h 46m

Harlingen Valley Intl

Thu 12/31

5:44 am-11:00 am

1 stop7h 16m

$509

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 16 resultsSorted by cheapest first

How to get the cheapest flight ticket from Seattle to Harlingen

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 Harlingen?

If you aren’t able to travel during the month of October, then book flights to Harlingen from Seattle during July instead. Flights to Harlingen in July, while not as cheap as those in October, still average around $0.

Can stopping save me money on Seattle to Harlingen flights?

You could potentially save up to 17% on your flight if you consider stops on a Seattle to Harlingen flight.

When to book flights from Seattle to Harlingen

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

Estimated round-trip price

Cheap Seattle to Harlingen (SEA to HRL) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Seattle to Harlingen

Best Price Found	$205
Fastest flight time	6h 00m
Direct flights	None

The best one-way flight to Harlingen from Seattle in the past 72 hours is $205. The best round-trip flight deal from Seattle to Harlingen found on momondo in the last 72 hours is $437.

The fastest flight from Seattle to Harlingen takes 6h 00m

There are no direct flights from Seattle to Harlingen. There are no popular flight routes from Seattle to Harlingen.

Search flight deals

Frequently asked questions about flying from Seattle to Harlingen

How far is Seattle/Tacoma Intl to Harlingen Valley Intl by plane?
Harlingen Valley Intl is 1992.5 mi away from Seattle/Tacoma Intl. By plane, this route typically takes 6h 00m.
When did momondo last update prices for flights from Seattle/Tacoma Intl Airport to Harlingen Valley Intl Airport?
Prices for flights from Seattle/Tacoma Intl Airport to Harlingen Valley Intl Airport are refreshed on a daily basis.
How many operators does momondo search for flights from Seattle/Tacoma Intl Airport to Harlingen Valley Intl Airport?
There is 1 operator available for flights from Seattle/Tacoma Intl Airport to Harlingen Valley Intl Airport as of September 2026.
How old do you have to be to fly from Seattle/Tacoma Intl Airport to Harlingen Valley Intl Airport?
The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Seattle/Tacoma Intl Airport to Harlingen Valley Intl Airport.
What documentation or ID do you need to fly to Harlingen Valley Intl Airport?
The travel and health documents required for your trip to Harlingen Valley Intl Airport can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Harlingen Valley Intl Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.
What is the most popular airline from Seattle to Harlingen?
momondo data reveals that the most frequently booked airline on the route from Seattle to Harlingen is American Airlines, representing 100% of all bookings.

Best airlines flying from Seattle to Harlingen

Compare and see reviews for airlines that fly from Seattle to Harlingen with momondo

Airline	Rating	Free Cancellation	Price
American Airlines	PriceFrom $237	Free Cancellation	Rating 7.0 12,073 reviews		Search American Airlines flights

Why use momondo?

Why should I use momondo to find a flight deal from Seattle to Harlingen?

momondo collates all your flight options in one place and lets you filter them to find the perfect flight from Seattle to Harlingen. momondo saves you time and could save you money on your trip.

Can I find flights from Seattle to Harlingen with flexible booking policies on momondo?

Yes. All flights to Harlingen from Seattle on momondo can be compared and filtered by various policies on offer, including flexible booking.

How can momondo help me find flights from Seattle to Harlingen?

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

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

Of course. momondo tracks the price of Seattle to Harlingen flights. All you need is a valid email address and we will do the rest; it is that quick and easy.

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Cheap flights from Seattle to Harlingen from $205

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Seattle to Harlingen departing on 10/14. 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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American Airlines flights from Seattle to Harlingen

Our best American Airlines deals on Seattle to Harlingen flight tickets

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How to get the cheapest flight ticket from Seattle to Harlingen

What is the cheapest month to fly to Harlingen?

Can stopping save me money on Seattle to Harlingen flights?

What is the cheapest airline that flies from Seattle/Tacoma Intl to Harlingen Valley Intl?

What airlines fly to Harlingen?

When to book flights from Seattle to Harlingen

Cheap Seattle to Harlingen (SEA to HRL) flight deals and tips

Best Price Found

Fastest flight time

Direct flights

Frequently asked questions about flying from Seattle to Harlingen

Best airlines flying from Seattle to Harlingen

Compare and see reviews for airlines that fly from Seattle to Harlingen with momondo

Why use momondo?

An easier way to manage your Harlingen trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.

Find better results for your trip to the United States

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List of cabin classes available on flights landing in Harlingen. Availability may vary depending on flight origin and airline.

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