United Flight 504 Deals & Information (2025/2026)

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United Flight 504 Route Deals From $81

The cheapest prices found with in the last 7 days for return flights were $155 and $81 for one-way flights to Washington Dulles Intl. for the period specified. Prices and availability are subject to change. Additional terms apply.

Fri, May 16 - Mon, May 19
BOS
Logan Intl.
IAD
Washington Dulles Intl.
$155 Roundtrip, found 8 hours ago
$155
Roundtrip
found 8 hours ago
Select United flight, departing Fri, May 16 from Logan Intl. to Washington Dulles Intl., returning Mon, May 19, priced at $155 found 8 hours ago
Wed, May 21 - Tue, Jun 3
BOS
Logan Intl.
IAD
Washington Dulles Intl.
$164 Roundtrip, found 4 days ago
$164
Roundtrip
found 4 days ago
Select United flight, departing Wed, May 21 from Logan Intl. to Washington Dulles Intl., returning Tue, Jun 3, priced at $164 found 4 days ago
Sun, Jun 29 - Fri, Jul 4
BOS
Logan Intl.
IAD
Washington Dulles Intl.
$164 Roundtrip, found 3 days ago
$164
Roundtrip
found 3 days ago
Select United flight, departing Sun, Jun 29 from Logan Intl. to Washington Dulles Intl., returning Fri, Jul 4, priced at $164 found 3 days ago
Wed, May 21 - Sat, May 31
BOS
Logan Intl.
IAD
Washington Dulles Intl.
$167 Roundtrip, found 4 days ago
$167
Roundtrip
found 4 days ago
Select United flight, departing Wed, May 21 from Logan Intl. to Washington Dulles Intl., returning Sat, May 31, priced at $167 found 4 days ago
Thu, May 22 - Sun, May 25
BOS
Logan Intl.
IAD
Washington Dulles Intl.
$167 Roundtrip, found 23 hours ago
$167
Roundtrip
found 23 hours ago
Select United flight, departing Thu, May 22 from Logan Intl. to Washington Dulles Intl., returning Sun, May 25, priced at $167 found 23 hours ago
Tue, May 13 - Thu, May 15
BOS
Logan Intl.
IAD
Washington Dulles Intl.
$168 Roundtrip, found 4 days ago
$168
Roundtrip
found 4 days ago
Select United flight, departing Tue, May 13 from Logan Intl. to Washington Dulles Intl., returning Thu, May 15, priced at $168 found 4 days ago
Sun, Jun 29 - Fri, Jul 4
BOS
Logan Intl.
IAD
Washington Dulles Intl.
$170 Roundtrip, found 3 days ago
$170
Roundtrip
found 3 days ago
Select United flight, departing Sun, Jun 29 from Logan Intl. to Washington Dulles Intl., returning Fri, Jul 4, priced at $170 found 3 days ago
Thu, Jan 1 - Thu, Jan 8
BOS
Logan Intl.
IAD
Washington Dulles Intl.
$173 Roundtrip, found 1 day ago
$173
Roundtrip
found 1 day ago
Select United flight, departing Thu, Jan 1 from Logan Intl. to Washington Dulles Intl., returning Thu, Jan 8, priced at $173 found 1 day ago
Sun, Jun 29 - Fri, Jul 4
BOS
Logan Intl.
IAD
Washington Dulles Intl.
$174 Roundtrip, found 3 days ago
$174
Roundtrip
found 3 days ago
Select United flight, departing Sun, Jun 29 from Logan Intl. to Washington Dulles Intl., returning Fri, Jul 4, priced at $174 found 3 days ago
Wed, May 21 - Sat, May 31
BOS
Logan Intl.
IAD
Washington Dulles Intl.
$177 Roundtrip, found 4 days ago
$177
Roundtrip
found 4 days ago
Select United flight, departing Wed, May 21 from Logan Intl. to Washington Dulles Intl., returning Sat, May 31, priced at $177 found 4 days ago

Frequently asked questions

What route does flight number UA504 take?
UA504 is used on multiple routes, but the most common is between San Francisco, CA Airport (SFO-San Francisco Intl.) and Los Angeles, CA Airport (LAX-Los Angeles Intl.). If your flight goes direct, you’ll arrive in about 1 hour and 51 minutes. Multi-stop flights can also travel under the same number, as can flights on other routes.
What terminal does UA504 fly out of?
Terminal 3 is where you’ll most likely board from if you’re booked on a flight out of San Francisco Airport. San Francisco Airport to Los Angeles, CA Airport (LAX-Los Angeles Intl.) is the most popular route for flight number UA504.
What kind of plane is on flight number UA504?
It’s highly likely you’ll be boarding an Airbus A319 if you’re on flight number UA504 from San Francisco, CA Airport (SFO-San Francisco Intl.) to Los Angeles, CA Airport (LAX-Los Angeles Intl.). This is the most commonly used type of aircraft on this particular route.
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 UA504 flight with Travelocity, please visit our Customer Service Portal.