$159+ Cheap flights from Seattle to Harlingen (SEA - HRL)
This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 9/2. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — HRL
Sep 4 — Sep 111
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
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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
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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 August 5, 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 August 5, 2026.
This United Airlines deal was found by Cheapflights users on 7/31. 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 9/17:00 am -
1 stop6h 59m
Thu 9/101:59 pm -
2 stops9h 52m
Deal found 7/31![United Airlines logo]()
$332
This Southwest deal was found by Cheapflights users on 7/31. 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 9/17:10 am -
2 stops11h 00m
Thu 9/105:55 pm -
2 stops8h 50m
Deal found 7/31![Southwest logo]()
$348
This American Airlines deal was found by Cheapflights users on 8/1. 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.
Fri 10/235:00 am -
1 stop7h 17m
Tue 10/2710:40 am -
1 stop8h 08m
Deal found 8/1![American Airlines logo]()
$358
This United Airlines deal was found by Cheapflights users on 8/4. 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 11/117:05 am -
1 stop6h 56m
Sun 11/155:05 am -
2 stops13h 22m
Deal found 8/4![United Airlines logo]()
$368
This Southwest deal was found by Cheapflights users on 8/1. 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.
Fri 10/99:00 am -
1 stop6h 50m
Mon 10/125:30 pm -
2 stops9h 25m
Deal found 8/1![Southwest logo]()
$374
This Southwest deal was found by Cheapflights users on 8/1. 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.
Fri 10/239:00 am -
1 stop6h 50m
Tue 10/276:15 am -
2 stops10h 05m
Deal found 8/1![Southwest logo]()
$378
This Southwest deal was found by Cheapflights users on 8/4. 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 11/119:15 am -
1 stop9h 25m
Sun 11/1510:45 am -
1 stop10h 30m
Deal found 8/4![Southwest logo]()
$384
This Southwest deal was found by Cheapflights users on 8/3. 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 9/18:55 am -
1 stop10h 50m
Mon 9/75:30 am -
1 stop8h 45m
Deal found 8/3![Southwest logo]()
$399
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 August 5, 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 August 5, 2026.
This United Airlines deal was found by Cheapflights users on 7/31. 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 9/17:00 am -
1 stop6h 59m
Thu 9/101:59 pm -
2 stops9h 52m
Deal found 7/31![United Airlines logo]()
$332
This Southwest deal was found by Cheapflights users on 7/31. 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 9/17:10 am -
2 stops11h 00m
Thu 9/105:55 pm -
2 stops8h 50m
Deal found 7/31![Southwest logo]()
$348
This United Airlines deal was found by Cheapflights users on 8/4. 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 11/117:05 am -
1 stop6h 56m
Sun 11/155:05 am -
2 stops13h 22m
Deal found 8/4![United Airlines logo]()
$368
This Southwest deal was found by Cheapflights users on 8/4. 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.
Fri 10/239:00 am -
1 stop6h 50m
Tue 10/276:15 am -
2 stops10h 05m
Deal found 8/4![Southwest logo]()
$378
This Southwest deal was found by Cheapflights users on 8/4. 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 11/119:30 am -
2 stops9h 10m
Sun 11/154:45 pm -
2 stops10h 10m
Deal found 8/4![Southwest logo]()
$383
This Southwest deal was found by Cheapflights users on 8/3. 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 9/18:55 am -
1 stop10h 50m
Mon 9/75:30 am -
1 stop8h 45m
Deal found 8/3![Southwest logo]()
$399
This United Airlines deal was found by Cheapflights users on 8/4. 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.
Sat 9/51:16 pm -
2 stops24h 43m
Wed 9/91:59 pm -
1 stop9h 37m
Deal found 8/4![United Airlines logo]()
$490
Last-minute flights from Seattle to HarlingenDiscover last-minute flight deals from Seattle to Harlingen. Data last updated August 5, 2026 and is based on user searches.
Discover last-minute flight deals from Seattle to Harlingen. Data last updated August 5, 2026 and is based on user searches.
This Southwest deal was found by Cheapflights users on 8/1. 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.
Sat 8/155:00 am -
2 stops8h 50m
Tue 8/187:25 am -
1 stop6h 50m
Deal found 8/1![Southwest logo]()
$506
This Southwest deal was found by Cheapflights users on 8/2. 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.
Sat 8/155:30 am -
2 stops11h 20m
Thu 8/205:30 am -
1 stop8h 45m
Deal found 8/2![Southwest logo]()
$539
This United Airlines deal was found by Cheapflights users on 7/31. 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 9/17:00 am -
1 stop6h 59m
Thu 9/101:59 pm -
2 stops9h 52m
Deal found 7/31![United Airlines logo]()
$332
This Southwest deal was found by Cheapflights users on 7/31. 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 9/17:10 am -
2 stops11h 00m
Thu 9/105:55 pm -
2 stops8h 50m
Deal found 7/31![Southwest logo]()
$348
This Southwest deal was found by Cheapflights users on 8/3. 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 9/17:10 am -
2 stops7h 35m
Mon 9/75:30 am -
1 stop8h 45m
Deal found 8/3![Southwest logo]()
$399
This United Airlines deal was found by Cheapflights users on 8/3. 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.
Sat 9/51:16 pm -
2 stops24h 43m
Wed 9/91:59 pm -
1 stop9h 37m
Deal found 8/3![United Airlines logo]()
$490
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 August 5, 2026.
Search for one-way flight options from Seattle to Harlingen. Find affordable one-way fares based on user searches. Data last updated August 5, 2026.
This United Airlines deal was found by Cheapflights users on 8/3. 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 9/27:00 am -
1 stop6h 59m
Deal found 8/3![United Airlines logo]()
$159
This Southwest deal was found by Cheapflights users on 7/31. 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.
Thu 10/159:00 am -
1 stop6h 50m
Deal found 7/31![Southwest logo]()
$180
This Southwest deal was found by Cheapflights users on 8/4. 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 8/188:55 am -
1 stop10h 50m
Deal found 8/4![Southwest logo]()
$208
This Southwest deal was found by Cheapflights users on 8/2. 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.
Sat 8/155:30 am -
2 stops11h 20m
Deal found 8/2![Southwest logo]()
$354
This United Airlines deal was found by Cheapflights users on 8/2. 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.
Sat 8/153:30 pm -
3 stops22h 29m
Deal found 8/2![United Airlines logo]()
$519
This United Airlines deal was found by Cheapflights users on 7/31. 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 10/153:25 pm -
3 stops22h 34m
Deal found 7/31![United Airlines logo]()
$570
This United Airlines deal was found by Cheapflights users on 8/4. 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 8/185:00 am -
3 stops14h 52m
Deal found 8/4![United Airlines logo]()
$759
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 August 5, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $332 (United Airlines) |
One-way from | $159 (United Airlines) |
Popular in | December |
Cheapest in | May |
Average price | $696 |
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 2,558,603 searches. Data last updated August 5, 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
Tue 9/1
7:00 am-3:59 pm
1 stop6h 59m
Harlingen Valley Intl
Thu 9/10
1:59 pm-9:51 pm
2 stops9h 52m
$332
SeattleHarlingen
SEA Seattle/Tacoma Intl - HRL Harlingen Valley Intl
SEAHRL
Seattle/Tacoma Intl
Tue 9/1
7:10 am-8:10 pm
2 stops11h 00m
Harlingen Valley Intl
Thu 9/10
5:55 pm-12:45 am
2 stops8h 50m
$348
SeattleHarlingen
SEA Seattle/Tacoma Intl - HRL Harlingen Valley Intl
SEAHRL
Seattle/Tacoma Intl
Wed 11/11
7:05 am-4:01 pm
1 stop6h 56m
Harlingen Valley Intl
Sun 11/15
5:05 am-4:27 pm
2 stops13h 22m
$368
SeattleHarlingen
SEA Seattle/Tacoma Intl - HRL Harlingen Valley Intl
SEAHRL
Seattle/Tacoma Intl
Fri 10/23
9:00 am-5:50 pm
1 stop6h 50m
Harlingen Valley Intl
Tue 10/27
6:15 am-2:20 pm
2 stops10h 05m
$378
SeattleHarlingen
SEA Seattle/Tacoma Intl - HRL Harlingen Valley Intl
SEAHRL
Seattle/Tacoma Intl
Wed 11/11
9:30 am-8:40 pm
2 stops9h 10m
Harlingen Valley Intl
Sun 11/15
4:45 pm-12:55 am
2 stops10h 10m
$383
SeattleHarlingen
SEA Seattle/Tacoma Intl - HRL Harlingen Valley Intl
SEAHRL
Seattle/Tacoma Intl
Tue 9/1
8:55 am-9:45 pm
1 stop10h 50m
Harlingen Valley Intl
Mon 9/7
5:30 am-12:15 pm
1 stop8h 45m
$399
SeattleHarlingen
SEA Seattle/Tacoma Intl - HRL Harlingen Valley Intl
SEAHRL
Seattle/Tacoma Intl
Sat 9/5
1:16 pm-3:59 pm
2 stops24h 43m
Harlingen Valley Intl
Wed 9/9
1:59 pm-9:36 pm
1 stop9h 37m
$490
Cheapest one-way
SeattleHarlingen
SEA Seattle/Tacoma Intl - HRL Harlingen Valley Intl
SEAHRL
Seattle/Tacoma Intl
Wed 9/2
7:00 am-3:59 pm
1 stop6h 59m
$159
Quickest one-way
SeattleHarlingen
SEA Seattle/Tacoma Intl - HRL Harlingen Valley Intl
SEAHRL
Seattle/Tacoma Intl
Thu 10/15
9:00 am-5:50 pm
1 stop6h 50m
$180
SeattleHarlingen
SEA Seattle/Tacoma Intl - HRL Harlingen Valley Intl
SEAHRL
Seattle/Tacoma Intl
Tue 8/18
8:55 am-9:45 pm
1 stop10h 50m
$208
Showing 1-10 of 14 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 August.
| 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 August 5, 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.
Crew
7.9
Overall
7.1
Boarding
7.5
Entertainment
6.8
Comfort
7.2
Food
6.4
Reviews
1 / 20
8.0
ExcellentMonica,Nov 2025
JAC - DFW
Crew
7.9
Overall
7.1
Boarding
7.5
Entertainment
6.8
Comfort
7.2
Food
6.4
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 August 5, 2026.
Seattle and Harlingen flights
Browse other Seattle and Harlingen flight options. Last updated on August 5, 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 August 5, 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 2,558,603 searches. Data last updated August 5, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$237 | Average$450 | FlexibilityNo cancel fee | On-time71% |