United Flight UA400 Deals & Information (2025/2026)

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United Flight 400 Route Deals From $50

The cheapest prices found with in the last 7 days for return flights were $139 and $50 for one-way flights to San Francisco Intl. for the period specified. Prices and availability are subject to change. Additional terms apply.

Tue, Oct 21 - Wed, Oct 22
SBA
Santa Barbara Municipal
SFO
San Francisco Intl.
$139 Roundtrip, found 4 days ago
$139
Roundtrip
found 4 days ago
Select United flight, departing Tue, Oct 21 from Santa Barbara Municipal to San Francisco Intl., returning Wed, Oct 22, priced at $139 found 4 days ago
Tue, Oct 21 - Wed, Oct 22
SBA
Santa Barbara Municipal
SFO
San Francisco Intl.
$200 Roundtrip, found 4 days ago
$200
Roundtrip
found 4 days ago
Select United flight, departing Tue, Oct 21 from Santa Barbara Municipal to San Francisco Intl., returning Wed, Oct 22, priced at $200 found 4 days ago
Tue, Oct 21 - Wed, Oct 22
SBA
Santa Barbara Municipal
SFO
San Francisco Intl.
$236 Roundtrip, found 4 days ago
$236
Roundtrip
found 4 days ago
Select United flight, departing Tue, Oct 21 from Santa Barbara Municipal to San Francisco Intl., returning Wed, Oct 22, priced at $236 found 4 days ago
Sat, Oct 11 - Tue, Oct 14
SBA
Santa Barbara Municipal
SFO
San Francisco Intl.
$239 Roundtrip, found 3 days ago
$239
Roundtrip
found 3 days ago
Select United flight, departing Sat, Oct 11 from Santa Barbara Municipal to San Francisco Intl., returning Tue, Oct 14, priced at $239 found 3 days ago
Mon, Nov 10 - Wed, Nov 12
SBA
Santa Barbara Municipal
SFO
San Francisco Intl.
$241 Roundtrip, found 23 hours ago
$241
Roundtrip
found 23 hours ago
Select United flight, departing Mon, Nov 10 from Santa Barbara Municipal to San Francisco Intl., returning Wed, Nov 12, priced at $241 found 23 hours ago
Thu, Oct 23 - Sun, Oct 26
SBA
Santa Barbara Municipal
SFO
San Francisco Intl.
$274 Roundtrip, just found
$274
Roundtrip
just found
Select United flight, departing Thu, Oct 23 from Santa Barbara Municipal to San Francisco Intl., returning Sun, Oct 26, priced at $274 just found
Thu, Oct 23 - Sun, Oct 26
SBA
Santa Barbara Municipal
SFO
San Francisco Intl.
$284 Roundtrip, just found
$284
Roundtrip
just found
Select United flight, departing Thu, Oct 23 from Santa Barbara Municipal to San Francisco Intl., returning Sun, Oct 26, priced at $284 just found

Frequently asked questions

What route does flight number UA400 take?
UA400 operates from Dulles Intl. Airport to Raleigh–Durham Airport and is a direct flight. This trip takes 1 hour and 11 minutes.
What kind of plane is on flight number UA400?
The route for flight number UA400 is generally Dulles Intl. Airport to RDU, and the Boeing 737-800 is the aircraft model you'll probably 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 UA400 flight with Travelocity, please visit our Customer Service Portal.