Delta Flight 166 Deals & Information (2026/2027)

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Delta Flight 166 Route Deals From $583

The cheapest prices found with in the last 7 days for return flights were $735 and $583 for one-way flights to Seattle - Tacoma Intl. for the period specified. Prices and availability are subject to change. Additional terms apply.

Fri, Apr 3 - Sun, Apr 12
HND
Haneda
SEA
Seattle - Tacoma Intl.
$735 Roundtrip, found 1 day ago
$735
Roundtrip
found 1 day ago
Select Delta flight, departing Fri, Apr 3 from Haneda to Seattle - Tacoma Intl., returning Sun, Apr 12, priced at $735 found 1 day ago
Fri, Apr 17 - Sat, May 2
HND
Haneda
SEA
Seattle - Tacoma Intl.
$776 Roundtrip, found 2 days ago
$776
Roundtrip
found 2 days ago
Select Delta flight, departing Fri, Apr 17 from Haneda to Seattle - Tacoma Intl., returning Sat, May 2, priced at $776 found 2 days ago
Sat, Aug 22 - Thu, Sep 3
HND
Haneda
SEA
Seattle - Tacoma Intl.
$791 Roundtrip, found 20 hours ago
$791
Roundtrip
found 20 hours ago
Select Delta flight, departing Sat, Aug 22 from Haneda to Seattle - Tacoma Intl., returning Thu, Sep 3, priced at $791 found 20 hours ago
Sun, Apr 19 - Sat, May 2
HND
Haneda
SEA
Seattle - Tacoma Intl.
$827 Roundtrip, found 2 days ago
$827
Roundtrip
found 2 days ago
Select Delta flight, departing Sun, Apr 19 from Haneda to Seattle - Tacoma Intl., returning Sat, May 2, priced at $827 found 2 days ago
Sat, Aug 29 - Sat, Sep 12
HND
Haneda
SEA
Seattle - Tacoma Intl.
$834 Roundtrip, found 11 hours ago
$834
Roundtrip
found 11 hours ago
Select Delta flight, departing Sat, Aug 29 from Haneda to Seattle - Tacoma Intl., returning Sat, Sep 12, priced at $834 found 11 hours ago
Fri, Apr 17 - Thu, May 7
HND
Haneda
SEA
Seattle - Tacoma Intl.
$883 Roundtrip, found 2 days ago
$883
Roundtrip
found 2 days ago
Select Delta flight, departing Fri, Apr 17 from Haneda to Seattle - Tacoma Intl., returning Thu, May 7, priced at $883 found 2 days ago

Frequently asked questions

What route does flight number DL166 take?
Flight number DL166 operates direct from HND to Sea-Tac Airport. During this trip, expect to be in the air for 9 hours and 3 minutes. It pays to book ahead to lock in your favorite seat.
How often is DL166 on time?
Around 90% of DL166 flights arrive as scheduled — so if you're jetting from Tokyo Airport (HND-Haneda) to SEA, you can kick back knowing that you'll make it to your destination ASAP. If this Delta journey encounters a delay, you can expect to wait roughly 17 minutes. Thanks to the airline's exceptional service, this route has a 4.1-star rating.
What terminal does DL166 fly out of?
You'll likely be taking off from Terminal 3 if you're booked on flight number DL166 direct from Haneda Airport (HND) to SEA.
What kind of plane is on flight number DL166?
The route for DL166 is predominantly Tokyo Haneda Airport to Seattle, WA Airport (SEA-Seattle - Tacoma Intl.), and the Airbus A330-900neo is the aircraft model you're likely to be flying with.
If I am not able to travel due to COVID-19, can I change my flight to a later date?
For more info about changing your DL166 flight with Travelocity, please visit our Customer Service Portal.