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Cheap flights from Seattle to Harlingen from $159

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 10/13. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
1 adult, Economy, 0 bags

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from Seattle to Harlingen

Cheap round-trip flights

Enter your travel dates to find the best prices.
American Airlines Logo
5:30 am - 3:05 pm
SEA
-
HRL
7h 35m
1 stop
American Airlines Logo
10:45 am - 4:42 pm
HRL
-
SEA
7h 57m
1 stop
$307American Airlines
Tue, Sep 15 - Tue, Sep 22
Southwest Logo
7:10 am - 4:45 pm
SEA
-
HRL
7h 35m
2 stops
Southwest Logo
1:45 pm - 6:35 pm
HRL
-
SEA
6h 50m
1 stop
$312Southwest
Tue, Sep 15 - Tue, Sep 22
Southwest Logo
7:10 am - 4:45 pm
SEA
-
HRL
7h 35m
2 stops
Southwest Logo
1:45 pm - 11:05 pm
HRL
-
SEA
11h 20m
2 stops
$317Southwest
Tue, Sep 15 - Tue, Sep 22
Southwest Logo
11:25 am - 10:35 pm
SEA
-
HRL
9h 10m
1 stop
Southwest Logo
5:55 pm - 12:40 am
HRL
-
SEA
8h 45m
2 stops
$343Southwest
Thu, Aug 13 - Thu, Aug 20
Southwest Logo
6:15 am - 4:05 pm
SEA
-
HRL
7h 50m
2 stops
Southwest Logo
5:55 pm - 12:40 am
HRL
-
SEA
8h 45m
2 stops
$348Southwest
Thu, Aug 13 - Thu, Aug 20
Southwest Logo
9:00 am - 5:50 pm
SEA
-
HRL
6h 50m
1 stop
Southwest Logo
5:30 pm - 12:55 am
HRL
-
SEA
9h 25m
2 stops
$358Southwest
Thu, Oct 1 - Fri, Oct 9
Southwest Logo
9:00 am - 5:50 pm
SEA
-
HRL
6h 50m
1 stop
Southwest Logo
11:55 am - 6:10 pm
HRL
-
SEA
8h 15m
1 stop
$363Southwest
Thu, Oct 1 - Fri, Oct 9
Southwest Logo
6:40 am - 8:10 pm
SEA
-
HRL
11h 30m
2 stops
Southwest Logo
3:30 pm - 10:55 pm
HRL
-
SEA
9h 25m
2 stops
$388Southwest
Wed, Aug 5 - Sat, Aug 8
Southwest Logo
6:40 am - 8:10 pm
SEA
-
HRL
11h 30m
2 stops
Southwest Logo
1:45 pm - 6:35 pm
HRL
-
SEA
6h 50m
1 stop
$389Southwest
Wed, Aug 5 - Tue, Aug 11
Southwest Logo
6:40 am - 8:10 pm
SEA
-
HRL
11h 30m
2 stops
Southwest Logo
1:45 pm - 11:05 pm
HRL
-
SEA
11h 20m
2 stops
$400Southwest
Wed, Aug 5 - Tue, Aug 11

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American Airlines flights from Seattle to Harlingen

Our best American Airlines deals on Seattle to Harlingen flight tickets
American Airlines
Sep 15
SEA5:30 amSeattle/Tacoma Intl
7h 35m
1 stop
HRL3:05 pmHarlingen Valley Intl
Sep 22
HRL10:45 amHarlingen Valley Intl
7h 57m
1 stop
SEA4:42 pmSeattle/Tacoma Intl
$307
American Airlines
Sep 29
SEA5:30 amSeattle/Tacoma Intl
7h 35m
1 stop
HRL3:05 pmHarlingen Valley Intl
Oct 13
HRL6:42 pmHarlingen Valley Intl
7h 28m
1 stop
SEA12:10 amSeattle/Tacoma Intl
$1,222

Southwest flights from Seattle to Harlingen

Our best Southwest deals on Seattle to Harlingen flight tickets
Southwest
Sep 15
SEA7:10 amSeattle/Tacoma Intl
7h 35m
2 stops
HRL4:45 pmHarlingen Valley Intl
Sep 22
HRL1:45 pmHarlingen Valley Intl
6h 50m
1 stop
SEA6:35 pmSeattle/Tacoma Intl
$312
Southwest
Sep 15
SEA7:10 amSeattle/Tacoma Intl
7h 35m
2 stops
HRL4:45 pmHarlingen Valley Intl
Sep 22
HRL1:45 pmHarlingen Valley Intl
11h 20m
2 stops
SEA11:05 pmSeattle/Tacoma Intl
$317
Southwest
Aug 13
SEA11:25 amSeattle/Tacoma Intl
9h 10m
1 stop
HRL10:35 pmHarlingen Valley Intl
Aug 20
HRL5:55 pmHarlingen Valley Intl
8h 45m
2 stops
SEA12:40 amSeattle/Tacoma Intl
$343

momondo Fare Finder

 
Customize your flight search to find flights from Seattle to Harlingen 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 July 16, 2026.
Use the filters below to find and compare flights from Seattle to Harlingen that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

SeattleHarlingen

SEA - HRL

SEAHRL

Seattle/Tacoma Intl

Tue 9/15

5:30 am-3:05 pm

1 stop7h 35m

Harlingen Valley Intl

Tue 9/22

10:45 am-4:42 pm

1 stop7h 57m

$307
Quickest round-trip

SeattleHarlingen

SEA - HRL

SEAHRL

Seattle/Tacoma Intl

Tue 9/15

7:10 am-4:45 pm

2 stops7h 35m

Harlingen Valley Intl

Tue 9/22

1:45 pm-6:35 pm

1 stop6h 50m

$312

SeattleHarlingen

SEA - HRL

SEAHRL

Seattle/Tacoma Intl

Tue 9/15

7:10 am-4:45 pm

2 stops7h 35m

Harlingen Valley Intl

Tue 9/22

1:45 pm-11:05 pm

2 stops11h 20m

$317

SeattleHarlingen

SEA - HRL

SEAHRL

Seattle/Tacoma Intl

Thu 8/13

11:25 am-10:35 pm

1 stop9h 10m

Harlingen Valley Intl

Thu 8/20

5:55 pm-12:40 am

2 stops8h 45m

$343

SeattleHarlingen

SEA - HRL

SEAHRL

Seattle/Tacoma Intl

Thu 8/13

6:15 am-4:05 pm

2 stops7h 50m

Harlingen Valley Intl

Thu 8/20

5:55 pm-12:40 am

2 stops8h 45m

$348

SeattleHarlingen

SEA - HRL

SEAHRL

Seattle/Tacoma Intl

Thu 10/1

9:00 am-5:50 pm

1 stop6h 50m

Harlingen Valley Intl

Fri 10/9

5:30 pm-12:55 am

2 stops9h 25m

$358

SeattleHarlingen

SEA - HRL

SEAHRL

Seattle/Tacoma Intl

Thu 10/1

9:00 am-5:50 pm

1 stop6h 50m

Harlingen Valley Intl

Fri 10/9

11:55 am-6:10 pm

1 stop8h 15m

$363

SeattleHarlingen

SEA - HRL

SEAHRL

Seattle/Tacoma Intl

Wed 8/5

6:40 am-8:10 pm

2 stops11h 30m

Harlingen Valley Intl

Sat 8/8

3:30 pm-10:55 pm

2 stops9h 25m

$388

SeattleHarlingen

SEA - HRL

SEAHRL

Seattle/Tacoma Intl

Wed 8/5

6:40 am-8:10 pm

2 stops11h 30m

Harlingen Valley Intl

Tue 8/11

1:45 pm-6:35 pm

1 stop6h 50m

$389

SeattleHarlingen

SEA - HRL

SEAHRL

Seattle/Tacoma Intl

Wed 8/5

6:40 am-8:10 pm

2 stops11h 30m

Harlingen Valley Intl

Tue 8/11

1:45 pm-11:05 pm

2 stops11h 20m

$400

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 14 resultsSorted by cheapest first
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See travel insights to Harlingen from

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

What is the cheapest month to fly to Harlingen?

If you aren’t able to travel during the month of September, then book flights to Harlingen from Seattle during May instead. Flights to Harlingen in May, while not as cheap as those in September, still average around $310.

Can stopping save me money on Seattle to Harlingen flights?

You could potentially save up to 21% 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

Fastest flight time

6h 50m

Direct flights

None
The fastest flight from Seattle to Harlingen takes 6h 50m
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 50m.

  • 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?

  • 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?

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 AirlinesPriceFrom $237Free CancellationRating
7.1
11,816 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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