United Flight 3540 Deals & Information (2026/2027)

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United Flight 3540 Route Deals From $132

The cheapest prices found with in the last 7 days for return flights were $194 and $132 for one-way flights to Pittsburgh Intl. for the period specified. Prices and availability are subject to change. Additional terms apply.

Sat, Aug 29 - Mon, Aug 31
IAD
Washington Dulles Intl.
PIT
Pittsburgh Intl.
$194 Roundtrip, found 21 hours ago
$194
Roundtrip
found 21 hours ago
Select United flight, departing Sat, Aug 29 from Washington Dulles Intl. to Pittsburgh Intl., returning Mon, Aug 31, priced at $194 found 21 hours ago
Sat, Aug 29 - Mon, Aug 31
IAD
Washington Dulles Intl.
PIT
Pittsburgh Intl.
$218 Roundtrip, found 21 hours ago
$218
Roundtrip
found 21 hours ago
Select United flight, departing Sat, Aug 29 from Washington Dulles Intl. to Pittsburgh Intl., returning Mon, Aug 31, priced at $218 found 21 hours ago
Sat, Oct 3 - Sun, Oct 4
IAD
Washington Dulles Intl.
PIT
Pittsburgh Intl.
$220 Roundtrip, found 19 hours ago
$220
Roundtrip
found 19 hours ago
Select United flight, departing Sat, Oct 3 from Washington Dulles Intl. to Pittsburgh Intl., returning Sun, Oct 4, priced at $220 found 19 hours ago
Fri, Sep 18 - Sat, Sep 19
IAD
Washington Dulles Intl.
PIT
Pittsburgh Intl.
$223 Roundtrip, found 2 hours ago
$223
Roundtrip
found 2 hours ago
Select United flight, departing Fri, Sep 18 from Washington Dulles Intl. to Pittsburgh Intl., returning Sat, Sep 19, priced at $223 found 2 hours ago
Sat, Oct 3 - Sun, Oct 4
IAD
Washington Dulles Intl.
PIT
Pittsburgh Intl.
$240 Roundtrip, found 19 hours ago
$240
Roundtrip
found 19 hours ago
Select United flight, departing Sat, Oct 3 from Washington Dulles Intl. to Pittsburgh Intl., returning Sun, Oct 4, priced at $240 found 19 hours ago
Fri, Aug 28 - Sun, Aug 30
IAD
Washington Dulles Intl.
PIT
Pittsburgh Intl.
$253 Roundtrip, found 21 hours ago
$253
Roundtrip
found 21 hours ago
Select United flight, departing Fri, Aug 28 from Washington Dulles Intl. to Pittsburgh Intl., returning Sun, Aug 30, priced at $253 found 21 hours ago
Sat, Aug 29 - Mon, Aug 31
IAD
Washington Dulles Intl.
PIT
Pittsburgh Intl.
$254 Roundtrip, found 21 hours ago
$254
Roundtrip
found 21 hours ago
Select United flight, departing Sat, Aug 29 from Washington Dulles Intl. to Pittsburgh Intl., returning Mon, Aug 31, priced at $254 found 21 hours ago
Sat, Oct 3 - Sun, Oct 4
IAD
Washington Dulles Intl.
PIT
Pittsburgh Intl.
$261 Roundtrip, found 19 hours ago
$261
Roundtrip
found 19 hours ago
Select United flight, departing Sat, Oct 3 from Washington Dulles Intl. to Pittsburgh Intl., returning Sun, Oct 4, priced at $261 found 19 hours ago

Frequently asked questions

What route does flight number UA3540 take?
UA3540 takes several routes. The most frequently flown is between Louisville Muhammad Ali Intl. Airport and ORD, which flies direct. This service generally takes 1 hour and 36 minutes. That said, there may possibly be other flights with this number that are multi-stop.
What kind of plane is on flight number UA3540?
If you're considering booking flight UA3540 from Louisville Muhammad Ali Intl. Airport to O'Hare Intl. Airport (ORD), you'll likely be heading off on an Embraer 170. Flight UA3540 serves a number of different routes, but this is the most popular.
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 UA3540 flight with Travelocity, please visit our Customer Service Portal.