United Flight 400 Deals & Information (2026/2027)

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United Flight 400 Route Deals From $222

The cheapest prices found with in the last 7 days for return flights were $329 and $222 for one-way flights to Washington Dulles Intl. for the period specified. Prices and availability are subject to change. Additional terms apply.

Fri, Jun 19 - Mon, Jun 29
ABQ
Albuquerque Intl. Sunport
IAD
Washington Dulles Intl.
$329 Roundtrip, found 3 days ago
$329
Roundtrip
found 3 days ago
Select United flight, departing Fri, Jun 19 from Albuquerque Intl. Sunport to Washington Dulles Intl., returning Mon, Jun 29, priced at $329 found 3 days ago
Tue, May 19 - Sat, May 23
ABQ
Albuquerque Intl. Sunport
IAD
Washington Dulles Intl.
$337 Roundtrip, found 6 hours ago
$337
Roundtrip
found 6 hours ago
Select United flight, departing Tue, May 19 from Albuquerque Intl. Sunport to Washington Dulles Intl., returning Sat, May 23, priced at $337 found 6 hours ago
Fri, Jun 19 - Mon, Jun 29
ABQ
Albuquerque Intl. Sunport
IAD
Washington Dulles Intl.
$339 Roundtrip, found 3 days ago
$339
Roundtrip
found 3 days ago
Select United flight, departing Fri, Jun 19 from Albuquerque Intl. Sunport to Washington Dulles Intl., returning Mon, Jun 29, priced at $339 found 3 days ago
Tue, May 19 - Sat, May 23
ABQ
Albuquerque Intl. Sunport
IAD
Washington Dulles Intl.
$347 Roundtrip, found 6 hours ago
$347
Roundtrip
found 6 hours ago
Select United flight, departing Tue, May 19 from Albuquerque Intl. Sunport to Washington Dulles Intl., returning Sat, May 23, priced at $347 found 6 hours ago
Fri, May 8 - Tue, May 12
ABQ
Albuquerque Intl. Sunport
IAD
Washington Dulles Intl.
$348 Roundtrip, found 3 days ago
$348
Roundtrip
found 3 days ago
Select United flight, departing Fri, May 8 from Albuquerque Intl. Sunport to Washington Dulles Intl., returning Tue, May 12, priced at $348 found 3 days ago
Fri, Jun 19 - Mon, Jun 29
ABQ
Albuquerque Intl. Sunport
IAD
Washington Dulles Intl.
$354 Roundtrip, found 3 days ago
$354
Roundtrip
found 3 days ago
Select United flight, departing Fri, Jun 19 from Albuquerque Intl. Sunport to Washington Dulles Intl., returning Mon, Jun 29, priced at $354 found 3 days ago
Tue, May 19 - Sat, May 23
ABQ
Albuquerque Intl. Sunport
IAD
Washington Dulles Intl.
$357 Roundtrip, found 6 hours ago
$357
Roundtrip
found 6 hours ago
Select United flight, departing Tue, May 19 from Albuquerque Intl. Sunport to Washington Dulles Intl., returning Sat, May 23, priced at $357 found 6 hours ago
Sat, Jun 20 - Sun, Jun 28
ABQ
Albuquerque Intl. Sunport
IAD
Washington Dulles Intl.
$358 Roundtrip, found 6 days ago
$358
Roundtrip
found 6 days ago
Select United flight, departing Sat, Jun 20 from Albuquerque Intl. Sunport to Washington Dulles Intl., returning Sun, Jun 28, priced at $358 found 6 days ago
Fri, May 8 - Tue, May 12
ABQ
Albuquerque Intl. Sunport
IAD
Washington Dulles Intl.
$363 Roundtrip, found 3 days ago
$363
Roundtrip
found 3 days ago
Select United flight, departing Fri, May 8 from Albuquerque Intl. Sunport to Washington Dulles Intl., returning Tue, May 12, priced at $363 found 3 days ago
Tue, May 19 - Sat, May 23
ABQ
Albuquerque Intl. Sunport
IAD
Washington Dulles Intl.
$364 Roundtrip, found 6 hours ago
$364
Roundtrip
found 6 hours ago
Select United flight, departing Tue, May 19 from Albuquerque Intl. Sunport to Washington Dulles Intl., returning Sat, May 23, priced at $364 found 6 hours ago
Tue, May 19 - Sat, May 23
ABQ
Albuquerque Intl. Sunport
IAD
Washington Dulles Intl.
$366 Roundtrip, found 6 hours ago
$366
Roundtrip
found 6 hours ago
Select United flight, departing Tue, May 19 from Albuquerque Intl. Sunport to Washington Dulles Intl., returning Sat, May 23, priced at $366 found 6 hours ago
Thu, May 21 - Sun, May 24
ABQ
Albuquerque Intl. Sunport
IAD
Washington Dulles Intl.
$366 Roundtrip, found 5 days ago
$366
Roundtrip
found 5 days ago
Select United flight, departing Thu, May 21 from Albuquerque Intl. Sunport to Washington Dulles Intl., returning Sun, May 24, priced at $366 found 5 days ago
Fri, May 8 - Tue, May 12
ABQ
Albuquerque Intl. Sunport
IAD
Washington Dulles Intl.
$373 Roundtrip, found 3 days ago
$373
Roundtrip
found 3 days ago
Select United flight, departing Fri, May 8 from Albuquerque Intl. Sunport to Washington Dulles Intl., returning Tue, May 12, priced at $373 found 3 days ago
Tue, May 19 - Sat, May 23
ABQ
Albuquerque Intl. Sunport
IAD
Washington Dulles Intl.
$375 Roundtrip, found 6 hours ago
$375
Roundtrip
found 6 hours ago
Select United flight, departing Tue, May 19 from Albuquerque Intl. Sunport to Washington Dulles Intl., returning Sat, May 23, priced at $375 found 6 hours ago
Tue, May 19 - Sat, May 23
ABQ
Albuquerque Intl. Sunport
IAD
Washington Dulles Intl.
$376 Roundtrip, found 6 hours ago
$376
Roundtrip
found 6 hours ago
Select United flight, departing Tue, May 19 from Albuquerque Intl. Sunport to Washington Dulles Intl., returning Sat, May 23, priced at $376 found 6 hours ago
Thu, May 21 - Sun, May 24
ABQ
Albuquerque Intl. Sunport
IAD
Washington Dulles Intl.
$376 Roundtrip, found 5 days ago
$376
Roundtrip
found 5 days ago
Select United flight, departing Thu, May 21 from Albuquerque Intl. Sunport to Washington Dulles Intl., returning Sun, May 24, priced at $376 found 5 days ago

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.