$105+ Cheap flights from Harlingen to Seattle (HRL - SEA)
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 10/31. Fares are subject to change and may not be available on all flights or dates of travel.
HRL — SEA
Sep 13 — Sep 201
Round-trip
1 adult, Economy
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Find cheap flights from Harlingen to Seattle 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 Harlingen to Seattle
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Best
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Cheapest flights from Harlingen to SeattleExplore the most affordable flight options available from Harlingen to Seattle. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 14, 2026.
Explore the most affordable flight options available from Harlingen to Seattle. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 14, 2026.
This American Airlines deal was found by Cheapflights users on 8/13. 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.
Thu 10/156:42 pm -
1 stop7h 28m
Tue 10/205:00 am -
1 stop7h 16m
Deal found 8/13![American Airlines logo]()
$257
This Southwest deal was found by Cheapflights users on 8/13. 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 10/155:30 pm -
2 stops9h 25m
Tue 10/208:55 am -
1 stop10h 00m
Deal found 8/13![Southwest logo]()
$305
This Southwest deal was found by Cheapflights users on 8/13. 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 8/2912:35 pm -
1 stop7h 10m
Wed 9/27:10 am -
2 stops11h 00m
Deal found 8/13![Southwest logo]()
$339
This United Airlines deal was found by Cheapflights users on 8/13. 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 8/291:59 pm -
1 stop9h 37m
Wed 9/27:00 am -
1 stop6h 59m
Deal found 8/13![United Airlines logo]()
$361
This Southwest deal was found by Cheapflights users on 8/9. 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 9/87:25 am -
1 stop6h 50m
Tue 9/157:10 am -
2 stops11h 05m
Deal found 8/9![Southwest logo]()
$363
This United Airlines deal was found by Cheapflights users on 8/13. 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.
Fri 8/281:59 pm -
1 stop7h 09m
Tue 9/17:00 am -
1 stop6h 59m
Deal found 8/13![United Airlines logo]()
$371
This Southwest deal was found by Cheapflights users on 8/10. 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 9/1111:55 am -
1 stop11h 50m
Sun 9/139:25 pm -
2 stops11h 55m
Deal found 8/10![Southwest logo]()
$373
This United Airlines deal was found by Cheapflights users on 8/9. 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 9/81:59 pm -
1 stop9h 37m
Thu 9/107:00 am -
1 stop6h 59m
Deal found 8/9![United Airlines logo]()
$377
This Southwest deal was found by Cheapflights users on 8/10. 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 9/87:25 am -
1 stop6h 50m
Thu 9/1012:35 pm -
1 stop6h 00m
Deal found 8/10![Southwest logo]()
$379
Best flights from Harlingen to SeattleDiscover carefully curated flight deals from Harlingen to Seattle that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated August 14, 2026.
Discover carefully curated flight deals from Harlingen to Seattle that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated August 14, 2026.
This Southwest deal was found by Cheapflights users on 8/13. 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 10/155:30 pm -
2 stops9h 25m
Tue 10/208:55 am -
1 stop10h 00m
Deal found 8/13![Southwest logo]()
$305
This United Airlines deal was found by Cheapflights users on 8/10. 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 1/125:16 pm -
1 stop7h 22m
Wed 1/137:03 am -
1 stop6h 31m
Deal found 8/10![United Airlines logo]()
$335
This Southwest deal was found by Cheapflights users on 8/9. 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 9/87:25 am -
1 stop6h 50m
Tue 9/157:10 am -
2 stops11h 05m
Deal found 8/9![Southwest logo]()
$363
This United Airlines deal was found by Cheapflights users on 8/13. 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.
Fri 8/281:59 pm -
1 stop7h 09m
Tue 9/17:00 am -
1 stop6h 59m
Deal found 8/13![United Airlines logo]()
$371
This Southwest deal was found by Cheapflights users on 8/10. 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 9/87:25 am -
1 stop6h 50m
Thu 9/1012:35 pm -
1 stop6h 00m
Deal found 8/10![Southwest logo]()
$379
This United Airlines deal was found by Cheapflights users on 8/9. 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 9/81:59 pm -
1 stop9h 37m
Thu 9/106:32 am -
2 stops11h 07m
Deal found 8/9![United Airlines logo]()
$382
This United Airlines deal was found by Cheapflights users on 8/10. 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 8/251:59 pm -
1 stop9h 37m
Sat 8/297:00 am -
1 stop6h 59m
Deal found 8/10![United Airlines logo]()
$405
This Southwest deal was found by Cheapflights users on 8/12. 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 8/285:30 am -
1 stop8h 45m
Tue 9/16:40 am -
2 stops8h 05m
Deal found 8/12![Southwest logo]()
$422
This Southwest deal was found by Cheapflights users on 8/12. 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 8/275:55 pm -
2 stops8h 45m
Mon 8/317:00 am -
2 stops11h 30m
Deal found 8/12![Southwest logo]()
$439
Last-minute flights from Harlingen to SeattleDiscover last-minute flight deals from Harlingen to Seattle. Data last updated August 14, 2026 and is based on user searches.
Discover last-minute flight deals from Harlingen to Seattle. Data last updated August 14, 2026 and is based on user searches.
This United Airlines deal was found by Cheapflights users on 8/13. 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.
Fri 8/281:59 pm -
1 stop7h 09m
Tue 9/17:00 am -
1 stop6h 59m
Deal found 8/13![United Airlines logo]()
$371
This Southwest deal was found by Cheapflights users on 8/13. 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 8/2912:35 pm -
1 stop7h 10m
Wed 9/27:10 am -
2 stops11h 00m
Deal found 8/13![Southwest logo]()
$339
This United Airlines deal was found by Cheapflights users on 8/13. 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 8/291:59 pm -
1 stop9h 37m
Wed 9/27:00 am -
1 stop6h 59m
Deal found 8/13![United Airlines logo]()
$361
This Southwest deal was found by Cheapflights users on 8/9. 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 9/87:25 am -
1 stop6h 50m
Tue 9/157:10 am -
2 stops11h 05m
Deal found 8/9![Southwest logo]()
$363
This United Airlines deal was found by Cheapflights users on 8/9. 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 9/81:59 pm -
1 stop9h 37m
Thu 9/107:00 am -
1 stop6h 59m
Deal found 8/9![United Airlines logo]()
$377
This Southwest deal was found by Cheapflights users on 8/10. 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 9/87:25 am -
1 stop6h 50m
Thu 9/1012:35 pm -
1 stop6h 00m
Deal found 8/10![Southwest logo]()
$379
This Southwest deal was found by Cheapflights users on 8/10. 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 9/1111:55 am -
1 stop11h 50m
Sun 9/139:25 pm -
2 stops11h 55m
Deal found 8/10![Southwest logo]()
$373
One-way flights from Harlingen to SeattleSearch for one-way flight options from Harlingen to Seattle. Find affordable one-way fares based on user searches. Data last updated August 14, 2026.
Search for one-way flight options from Harlingen to Seattle. Find affordable one-way fares based on user searches. Data last updated August 14, 2026.
This Delta deal was found by Cheapflights users on 8/11. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/312:13 pm -
1 stop8h 40m
Deal found 8/11![Delta logo]()
$105
This United Airlines deal was found by Cheapflights users on 8/11. 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 9/121:59 pm -
1 stop9h 39m
Deal found 8/11![United Airlines logo]()
$118
This Southwest deal was found by Cheapflights users on 8/11. 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 9/123:30 pm -
2 stops9h 30m
Deal found 8/11![Southwest logo]()
$123
This United Airlines deal was found by Cheapflights users on 8/11. 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 10/315:05 am -
2 stops13h 22m
Deal found 8/11![United Airlines logo]()
$173
Find flight deals from Harlingen to Seattle
Discover tips and strategies to find the most affordable flight options for your journey from Harlingen (HRL) to Seattle (SEA). 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 14, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $257 (American Airlines) |
One-way from | $105 (Delta) |
Popular in | January |
Cheapest in | February |
Average price | $414 |
Cheapflights Fare Finder
Customize your flight search to find flights from Harlingen to Seattle 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 14, 2026.
Use the filters below to find and compare flights from Harlingen to Seattle that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
HarlingenSeattle
HRL Harlingen Valley Intl - SEA Seattle/Tacoma Intl
HRLSEA
Harlingen Valley Intl
Thu 10/15
5:30 pm-12:55 am
2 stops9h 25m
Seattle/Tacoma Intl
Tue 10/20
8:55 am-8:55 pm
1 stop10h 00m
$305
HarlingenSeattle
HRL Harlingen Valley Intl - SEA Seattle/Tacoma Intl
HRLSEA
Harlingen Valley Intl
Tue 1/12
5:16 pm-10:38 pm
1 stop7h 22m
Seattle/Tacoma Intl
Wed 1/13
7:03 am-3:34 pm
1 stop6h 31m
$335
HarlingenSeattle
HRL Harlingen Valley Intl - SEA Seattle/Tacoma Intl
HRLSEA
Harlingen Valley Intl
Tue 9/8
7:25 am-12:15 pm
1 stop6h 50m
Seattle/Tacoma Intl
Tue 9/15
7:10 am-8:15 pm
2 stops11h 05m
$363
HarlingenSeattle
HRL Harlingen Valley Intl - SEA Seattle/Tacoma Intl
HRLSEA
Harlingen Valley Intl
Fri 8/28
1:59 pm-7:08 pm
1 stop7h 09m
Seattle/Tacoma Intl
Tue 9/1
7:00 am-3:59 pm
1 stop6h 59m
$371
Quickest round-trip
HarlingenSeattle
HRL Harlingen Valley Intl - SEA Seattle/Tacoma Intl
HRLSEA
Harlingen Valley Intl
Tue 9/8
7:25 am-12:15 pm
1 stop6h 50m
Seattle/Tacoma Intl
Thu 9/10
12:35 pm-8:35 pm
1 stop6h 00m
$379
HarlingenSeattle
HRL Harlingen Valley Intl - SEA Seattle/Tacoma Intl
HRLSEA
Harlingen Valley Intl
Tue 9/8
1:59 pm-9:36 pm
1 stop9h 37m
Seattle/Tacoma Intl
Thu 9/10
6:32 am-7:39 pm
2 stops11h 07m
$382
HarlingenSeattle
HRL Harlingen Valley Intl - SEA Seattle/Tacoma Intl
HRLSEA
Harlingen Valley Intl
Tue 8/25
1:59 pm-9:36 pm
1 stop9h 37m
Seattle/Tacoma Intl
Sat 8/29
7:00 am-3:59 pm
1 stop6h 59m
$405
HarlingenSeattle
HRL Harlingen Valley Intl - SEA Seattle/Tacoma Intl
HRLSEA
Harlingen Valley Intl
Fri 8/28
5:30 am-12:15 pm
1 stop8h 45m
Seattle/Tacoma Intl
Tue 9/1
6:40 am-4:45 pm
2 stops8h 05m
$422
HarlingenSeattle
HRL Harlingen Valley Intl - SEA Seattle/Tacoma Intl
HRLSEA
Harlingen Valley Intl
Thu 8/27
5:55 pm-12:40 am
2 stops8h 45m
Seattle/Tacoma Intl
Mon 8/31
7:00 am-8:30 pm
2 stops11h 30m
$439
Cheapest one-way
Quickest one-way
HarlingenSeattle
HRL Harlingen Valley Intl - SEA Seattle/Tacoma Intl
HRLSEA
Harlingen Valley Intl
Sat 9/12
1:59 pm-9:38 pm
1 stop9h 39m
$118
Showing 1-10 of 14 resultsSorted by cheapest first
Compare providers for flights from Harlingen to Seattle
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 Harlingen to Seattle 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 Harlingen-Seattle flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Harlingen-Seattle flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Harlingen-Seattle flight searches over the past month and is updated monthly.
- Most trusted provider: When it comes to deals on Harlingen-Seattle 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 Harlingen-Seattle 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 Harlingen to Seattle
Have a flexible travel schedule? Discover the best time to fly to Seattle from Harlingen with our price prediction graph.
HRL-SEA
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.
Cheapflights Insights
Everything you need to know about your flight from Harlingen to Seattle
Reviews of airlines servicing Seattle
Get insights into the airlines that provide service to Seattle. 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 Seattle. Reviews last updated August 14, 2026.
Read through reviews of airlines operating flights from Harlingen to Seattle, such as Southwest,United Airlines, andAmerican Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Comfort
8.0
Crew
8.6
Boarding
8.1
Food
7.0
Entertainment
7.5
Overall
8.0
Reviews
1 / 20
6.0
GoodScott,Feb 2026
HOU - FLL
Comfort
8.0
Crew
8.6
Boarding
8.1
Food
7.0
Entertainment
7.5
Overall
8.0
Reviews
1 / 20
6.0
GoodScott,Feb 2026
HOU - FLL
Comfort
8.0
Crew
8.6
Boarding
8.1
Food
7.0
Entertainment
7.5
Overall
8.0
Reviews
1 / 20
6.0
GoodScott,Feb 2026
HOU - FLL
Comfort
8.0
Crew
8.6
Boarding
8.1
Food
7.0
Entertainment
7.5
Overall
8.0
Reviews
1 / 20
6.0
GoodScott,Feb 2026
HOU - FLL
Related info for your journey
Find useful and relevant information for your journey from Harlingen to Seattle. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
Traveling to a place near Seattle?
Book flights to Seattle if you plan to visit one of these locationsSeaTac
Renton
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Harlingen and Seattle flights
Browse other Harlingen and Seattle flight options. Last updated on August 14, 2026.
Other flights from Harlingen
Browse through other flights departing from Harlingen. Flights are based on user searches made on Cheapflights and were last updated on August 14, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Other flights to Seattle
Explore flights to Seattle departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on August 14, 2026.
Top 3 airlines flying from Harlingen to Seattle
Discover the top 3 airlines that operate flights from Harlingen to Seattle. 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 14, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$215 | Average$472 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$236 | Average$397 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$297 | Average$423 | FlexibilityNo cancel fee | On-time63% |