Delta Flight AS3997 Deals & Information (2025/2026)

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Delta Flight 3997 Route Deals From

The cheapest prices found with in the last 7 days for return flights were $131 and for one-way flights to San Francisco Intl. for the period specified. Prices and availability are subject to change. Additional terms apply.

Thu, Sep 18 - Tue, Sep 23
SEA
Seattle - Tacoma Intl.
SFO
San Francisco Intl.
$131 Roundtrip, found 3 hours ago
$131
Roundtrip
found 3 hours ago
Select Delta flight, departing Thu, Sep 18 from Seattle - Tacoma Intl. to San Francisco Intl., returning Tue, Sep 23, priced at $131 found 3 hours ago
Thu, Sep 18 - Tue, Sep 23
SEA
Seattle - Tacoma Intl.
SFO
San Francisco Intl.
$164 Roundtrip, found 3 hours ago
$164
Roundtrip
found 3 hours ago
Select Delta flight, departing Thu, Sep 18 from Seattle - Tacoma Intl. to San Francisco Intl., returning Tue, Sep 23, priced at $164 found 3 hours ago

Frequently asked questions

What route does flight number DL3997 take?
Flight number DL3997 takes approximately 1 hour and 17 minutes to fly directly from Detroit Metropolitan Wayne County Airport (DTW) to MSN. Sure, there’s magic in the destination, but half the fun is in the journey!
What terminal does DL3997 fly out of?
You’ll likely be boarding the plane from Terminal EM if you’re traveling on DL3997 direct from Metro Airport to Truax Field.
What kind of plane is on flight number DL3997?
You’ll probably be cruising aboard the Bombardier CRJ900 if you’ve reserved a seat on flight DL3997. This flight usually leaves from Detroit, MI Airport (DTW-Detroit Metropolitan Wayne County) and lands at Truax Field.
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 DL3997 flight with Travelocity, please visit our Customer Service Portal.