$159+ Cheap flights from Seattle to Harlingen (SEA - HRL)
This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 10/28. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — HRL
Oct 23 — Oct 301
Round-trip
1 adult, Economy
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Find cheap flights from Seattle to Harlingen with Cheapflights
1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”2. Select your favorite providers
We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.3. Compare prices and book
Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.Cheap flight deals from Seattle to Harlingen
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Best
Last-minute
One-way
Cheapest flights from Seattle to HarlingenExplore the most affordable flight options available from Seattle to Harlingen. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 23, 2026.
Explore the most affordable flight options available from Seattle to Harlingen. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 23, 2026.
This Southwest deal was found by Cheapflights users on 9/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/218:55 am -
1 stop10h 05m
Wed 11/47:25 am -
1 stop13h 10m
Deal found 9/17![Southwest logo]()
$312
This American Airlines deal was found by Cheapflights users on 9/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/285:00 am -
1 stop7h 16m
Tue 11/310:44 am -
1 stop8h 10m
Deal found 9/18![American Airlines logo]()
$317
This Southwest deal was found by Cheapflights users on 9/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/288:55 am -
1 stop10h 05m
Tue 11/37:25 am -
2 stops12h 25m
Deal found 9/18![Southwest logo]()
$333
This United Airlines deal was found by Cheapflights users on 9/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/102:00 pm -
1 stop6h 48m
Wed 11/115:25 pm -
1 stop7h 26m
Deal found 9/17![United Airlines logo]()
$411
This American Airlines deal was found by Cheapflights users on 9/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/611:45 pm -
1 stop8h 23m
Sat 10/102:46 pm -
1 stop6h 58m
Deal found 9/21![American Airlines logo]()
$449
Best flights from Seattle to HarlingenDiscover carefully curated flight deals from Seattle to Harlingen that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 23, 2026.
Discover carefully curated flight deals from Seattle to Harlingen that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 23, 2026.
This Southwest deal was found by Cheapflights users on 9/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/218:55 am -
1 stop10h 05m
Wed 11/412:50 pm -
2 stops11h 30m
Deal found 9/17![Southwest logo]()
$312
This United Airlines deal was found by Cheapflights users on 9/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/102:00 pm -
1 stop6h 48m
Wed 11/115:25 pm -
1 stop7h 26m
Deal found 9/19![United Airlines logo]()
$437
This Southwest deal was found by Cheapflights users on 9/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/69:00 am -
2 stops10h 00m
Sat 10/1012:40 pm -
2 stops11h 05m
Deal found 9/21![Southwest logo]()
$500
This United Airlines deal was found by Cheapflights users on 9/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/2111:58 pm -
1 stop20h 01m
Wed 1/65:05 am -
2 stops12h 43m
Deal found 9/19![United Airlines logo]()
$668
This United Airlines deal was found by Cheapflights users on 9/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/245:00 am -
2 stops14h 59m
Wed 1/65:05 am -
2 stops12h 43m
Deal found 9/19![United Airlines logo]()
$700
This United Airlines deal was found by Cheapflights users on 9/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/245:00 am -
2 stops14h 59m
Thu 1/75:05 am -
2 stops12h 43m
Deal found 9/21![United Airlines logo]()
$713
This United Airlines deal was found by Cheapflights users on 9/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/2111:58 pm -
1 stop20h 01m
Thu 1/75:05 am -
2 stops12h 43m
Deal found 9/21![United Airlines logo]()
$726
Last-minute flights from Seattle to HarlingenDiscover last-minute flight deals from Seattle to Harlingen. Data last updated September 23, 2026 and is based on user searches.
Discover last-minute flight deals from Seattle to Harlingen. Data last updated September 23, 2026 and is based on user searches.
This American Airlines deal was found by Cheapflights users on 9/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/611:45 pm -
1 stop8h 23m
Sat 10/102:46 pm -
1 stop6h 58m
Deal found 9/21![American Airlines logo]()
$449
This Southwest deal was found by Cheapflights users on 9/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/69:00 am -
2 stops10h 00m
Sat 10/1012:40 pm -
2 stops11h 05m
Deal found 9/21![Southwest logo]()
$500
This American Airlines deal was found by Cheapflights users on 9/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/135:00 am -
1 stop7h 16m
Tue 10/205:50 am -
1 stop7h 24m
Deal found 9/21![American Airlines logo]()
$454
This United Airlines deal was found by Cheapflights users on 9/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/137:17 am -
1 stop6h 42m
Tue 10/202:00 pm -
2 stops11h 26m
Deal found 9/21![United Airlines logo]()
$481
This Southwest deal was found by Cheapflights users on 9/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/139:00 am -
2 stops10h 00m
Tue 10/204:35 pm -
2 stops9h 20m
Deal found 9/21![Southwest logo]()
$541
This Southwest deal was found by Cheapflights users on 9/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/218:55 am -
1 stop10h 05m
Wed 11/47:25 am -
1 stop13h 10m
Deal found 9/17![Southwest logo]()
$312
This American Airlines deal was found by Cheapflights users on 9/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/285:00 am -
1 stop7h 16m
Tue 11/310:44 am -
1 stop8h 10m
Deal found 9/18![American Airlines logo]()
$317
This Southwest deal was found by Cheapflights users on 9/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/288:55 am -
1 stop10h 05m
Tue 11/37:25 am -
2 stops12h 25m
Deal found 9/18![Southwest logo]()
$333
One-way flights from Seattle to HarlingenSearch for one-way flight options from Seattle to Harlingen. Find affordable one-way fares based on user searches. Data last updated September 23, 2026.
Search for one-way flight options from Seattle to Harlingen. Find affordable one-way fares based on user searches. Data last updated September 23, 2026.
This American Airlines deal was found by Cheapflights users on 9/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/285:00 am -
1 stop7h 16m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/18![American Airlines logo]()
$159
This United Airlines deal was found by Cheapflights users on 9/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/2810:40 am -
2 stops10h 08m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/18![United Airlines logo]()
$174
This Southwest deal was found by Cheapflights users on 9/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/148:55 am -
1 stop10h 05m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/21![Southwest logo]()
$205
This Southwest deal was found by Cheapflights users on 9/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/2711:40 am -
1 stop9h 35m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/19![Southwest logo]()
$275
This United Airlines deal was found by Cheapflights users on 9/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/141:19 pm -
3 stops28h 25m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/21![United Airlines logo]()
$483
This United Airlines deal was found by Cheapflights users on 9/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/275:00 am -
3 stops30h 23m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/19![United Airlines logo]()
$662
Find flight deals from Seattle to Harlingen
Discover tips and strategies to find the most affordable flight options for your journey from Seattle (SEA) to Harlingen (HRL). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated September 23, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $312 (Southwest) |
One-way from | $159 (American Airlines) |
Popular in | December |
Cheapest in | May |
Average price | $685 |
Cheapflights 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, Cheapflights users made 7,457,451 searches. Data last updated September 23, 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
Cheapest round-trip
Quickest round-trip
SeattleHarlingen
SEA Seattle/Tacoma Intl - HRL Harlingen Valley Intl
SEAHRL
Seattle/Tacoma Intl
Wed 10/28
5:00 am-2:16 pm
1 stop7h 16m
Harlingen Valley Intl
Wed 12/31
12:00 am-10:00 pm
Nonstop0h 00m
$159
SeattleHarlingen
SEA Seattle/Tacoma Intl - HRL Harlingen Valley Intl
SEAHRL
Seattle/Tacoma Intl
Wed 10/14
8:55 am-9:00 pm
1 stop10h 05m
Harlingen Valley Intl
Wed 12/31
12:00 am-10:00 pm
Nonstop0h 00m
$205
SeattleHarlingen
SEA Seattle/Tacoma Intl - HRL Harlingen Valley Intl
SEAHRL
Seattle/Tacoma Intl
Sun 9/27
11:40 am-11:15 pm
1 stop9h 35m
Harlingen Valley Intl
Wed 12/31
12:00 am-10:00 pm
Nonstop0h 00m
$275
SeattleHarlingen
SEA Seattle/Tacoma Intl - HRL Harlingen Valley Intl
SEAHRL
Seattle/Tacoma Intl
Wed 10/21
8:55 am-9:00 pm
1 stop10h 05m
Harlingen Valley Intl
Wed 11/4
12:50 pm-10:20 pm
2 stops11h 30m
$312
SeattleHarlingen
SEA Seattle/Tacoma Intl - HRL Harlingen Valley Intl
SEAHRL
Seattle/Tacoma Intl
Wed 10/28
12:20 pm-1:21 pm
3 stops23h 01m
Harlingen Valley Intl
Wed 12/31
12:00 am-10:00 pm
Nonstop0h 00m
$373
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
Wed 10/14
1:19 pm-7:44 pm
3 stops28h 25m
Harlingen Valley Intl
Wed 12/31
12:00 am-10:00 pm
Nonstop0h 00m
$483
SeattleHarlingen
SEA Seattle/Tacoma Intl - HRL Harlingen Valley Intl
SEAHRL
Seattle/Tacoma Intl
Tue 10/6
9:00 am-9:00 pm
2 stops10h 00m
Harlingen Valley Intl
Sat 10/10
12:40 pm-9:45 pm
2 stops11h 05m
$500
SeattleHarlingen
SEA Seattle/Tacoma Intl - HRL Harlingen Valley Intl
SEAHRL
Seattle/Tacoma Intl
Sun 9/27
5:00 am-1:23 pm
3 stops30h 23m
Harlingen Valley Intl
Wed 12/31
12:00 am-10:00 pm
Nonstop0h 00m
$662
SeattleHarlingen
SEA Seattle/Tacoma Intl - HRL Harlingen Valley Intl
SEAHRL
Seattle/Tacoma Intl
Mon 12/21
11:58 pm-9:59 pm
1 stop20h 01m
Harlingen Valley Intl
Wed 1/6
5:05 am-3:48 pm
2 stops12h 43m
$668
Showing 1-10 of 13 resultsSorted by cheapest first
Compare providers for flights from Seattle to Harlingen
Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Seattle to Harlingen in September.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars |
- Most accurate provider: When it comes to deals on Seattle-Harlingen flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Seattle-Harlingen flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Seattle-Harlingen flight searches over the past month and is updated monthly.
- Most trusted provider: When it comes to deals on Seattle-Harlingen flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Seattle-Harlingen flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.
Best time to book a flight from Seattle to Harlingen
Have a flexible travel schedule? Discover the best time to fly to Harlingen from Seattle with our price prediction graph.
SEA-HRL
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.
Reviews of airlines servicing Harlingen
Get insights into the airlines that provide service to Harlingen. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Harlingen. Reviews last updated September 23, 2026.
Read reviews from past customers who have flown American Airlines from Seattle to Harlingen. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Boarding
7.4
Entertainment
6.8
Crew
7.9
Overall
7.0
Food
6.4
Comfort
7.2
Reviews
1 / 20
8.0
ExcellentMonica,Nov 2025
JAC - DFW
Boarding
7.4
Entertainment
6.8
Crew
7.9
Overall
7.0
Food
6.4
Comfort
7.2
Reviews
1 / 20
8.0
ExcellentMonica,Nov 2025
JAC - DFW
Related info for your journey
Find useful and relevant information for your journey from Seattle to Harlingen. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
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Complete your trip
Complete your trip to Harlingen by adding a car rental and/or hotel reservation to your travel itinerary.
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Other flights to Harlingen
Explore flights to Harlingen departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on September 23, 2026.
Seattle and Harlingen flights
Browse other Seattle and Harlingen flight options. Last updated on September 23, 2026.
Other flights from Seattle
Browse through other flights departing from Seattle. Flights are based on user searches made on Cheapflights and were last updated on September 23, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Top airline flying from Seattle to Harlingen
Discover the top airline that operate flights from Seattle to Harlingen. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 7,457,451 searches. Data last updated September 23, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$237 | Average$457 | FlexibilityNo cancel fee | On-time71% |